Color protectant compositions

Abstract

Provided herein are color protectant compositions for dyed human hair, and methods for determining the same.

Description

BACKGROUND

Even after long, expensive coloring sessions, consumers who dye their hair report that a significant portion of the hair dye is lost within the first few washes. Most common commercial hair dyes consist of large chromophores (dye molecules) that are deposited within the hair fiber through a process of hair swelling and dye deposition. Since these chromophores are not covalently attached to the hair itself, they commonly leach from the hair during routine washing and conditioning. This is a nuisance for consumers and requires routine trips to the salon and the exhaustive use of chemicals, some of which can cause permanent damage to the hair and harm to the environment. While the search continues for more attractive and environmentally greener ways to dye hair, the need remains for formulations which can reduce the amount of color loss, thereby resulting in fewer trips to the salon and a reduction in the use of harmful chemicals.

SUMMARY

Provided herein are methods of preserving color dye in hair comprising the application of certain cationic polyurethane based compositions. FIG. 2A and FIG. 2B, for example, shows that wash solutions comprising the disclosed cationic polyurethanes result in minimal dye loss when compared to commercially available color protectant resins.

Also provided herein are methods for determining and evaluating the color retention capabilities of cosmetic compositions through the use of dialysis techniques.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a dialysis experiment mimicking hair dye color loss, where reservoir samples containing dye leached from the dialysis tubing show that submersion of dialysis tubing containing hair dye in a 0.8 wt % cationic WBPU solution (left) causes less dye loss from the tubing compared to submersion of the hair dye in a 0.8 wt % solution of Merquat™ 2003 PR (Polyquaternium-53, Lubrizol Advanced Materials) and Merquat™ 100 (Polyquaternium-6, Lubrizol Advanced Materials) (right). FIG. 1B is the quantification of the color loss using colorimetry, and shows less color loss from dialysis tubing when submerged in a 0.8 wt % cationic WBPU reservoir versus submersion in a reservoir of 0.8 wt % Merquat™ 2003 PR and Merquat™ 100. FIG. 1C is a dialysis experiment mimicking hair dye color loss, where reservoir samples containing dye leached from the dialysis tubing show that submersion of dialysis tubing containing hair dye in a 5 wt % cationic WBPU solution causes less dye loss from the tubing compared to submersion of the hair dye in a 5 wt % solution of N-Durhance™ A-1000 (Polyacrylamidopropyltrimonium chloride, Ashland). FIG. 1D is the quantification of the color loss using colorimetry, and shows less color loss from dialysis tubing when submerged in a 5 wt % cationic WBPU reservoir versus submersion in a reservoir of 5 wt % solution of N-Durhance™ A-1000. FIG. 1E is a dialysis experiment mimicking hair dye color loss, where conditioner reservoir samples containing dye leached from the dialysis tubing show that submersion of dialysis tubing containing hair dye in a conditioner containing 0.3 wt % cationic WBPU causes less dye loss from the tubing compared to submersion of the hair dye in a commercial conditioner. FIG. 1F is the quantification of the color loss using colorimetry (total chroma change (ΔC), and shows less color loss from dialysis tubing when submerged in a conditioner containing 0.3 wt % cationic WBPU reservoir versus submersion in a reservoir containing blank conditioner or commercial conditioner. FIG. 1G is the quantification of the color loss using colorimetry (total change in red color (Δa), and shows less color loss from dialysis tubing when submerged in a conditioner containing 0.3 wt % cationic WBPU reservoir versus submersion in a reservoir containing blank conditioner or commercial conditioner.

FIG. 2A illustrates the color loss from hair tresses treated with the disclosed cationic polyurethane (left) and dipped in water twenty times, and the color loss from the commercially available color protectant polymers Merquat™ 2003 PR and Merquat™ 100 (right). There is significantly less color loss when hair is treated with the cationic WBPU prior to dipping in water, rather than treatment with the Merquat™ mixture. FIG. 2B illustrates the color loss from hair treated with the disclosed cationic polyurethane (left) and dipped in a mild sodium laureth sulfate (surfactant) solution fifteen times, and the color loss from the commercially available color protectant polymer N-Durhance™ A-1000 (right) when dipped in a mild sodium laureth sulfate (surfactant) solution fifteen times. There is significantly less color loss when hair is treated with the cationic WBPU prior to dipping in the surfactant solution.

FIG. 3 illustrates the color loss data from an in vivo study in which a consumer with freshly dyed hair was subjected to extended washing and conditioning with formulations containing the disclosed cationic polyurethane on one side of their head and subjected to extended washing and conditioning with formulations without the disclosed cationic polyurethane on the other side of the head. The colorimetry data shows that the color loss over 11 days of washing, as indicated by ΔE, is reduced when using the treatments containing the cationic WBPU. A blinded, trained sensory evaluator determined that there were no detrimental visual or sensory effects observed when using treatments containing the cationic WBPU.

DETAILED DESCRIPTION

I. Definitions

A composition, process, or method described herein that “consists essentially of” a cationic polyurethane and other components means that the recited cationic polyurethane is the only polyurethane present in the recited composition, process, or method. Thus, “consists essentially of” or “consisting essentially of” is open ended for all terms except for the inclusion of additional polyurethanes, i.e., only the recited cationic polyurethane is present.

A composition, process, or method described herein that “consists of” a cationic polyurethane and other components means that only the recited components are present. In other words, “consisting of” excludes any element, step, or ingredient not specified. “Consists of” and “consisting of” are used interchangeably.

“Comprising” is inclusive or open-ended and does not exclude additional, un-recited elements or method steps.

As used herein, “cationic polyurethanes” refer to thermoplastic polymers comprising carbamate (urethane) groups and which bear an overall net positive charge at pH≤7. In some aspects, the cationic polyurethanes described herein bear an overall net positive charge at pH from about 3.7 to about 6.5, from about 3.7 to about 6.0, or from about 3.7 to about 5.5. Unless otherwise specified, cationic polyurethanes, when used herein, include amphoteric/cationic polyurethanes. In one aspect, however, cationic polyurethanes do not encompass amphoteric/cationic polyurethanes.

As used herein, “amphoteric polyurethanes” refer to thermoplastic polymers comprising carbamate (urethane) groups and which can act both as a cationic or an anionic polyurethanes depending on neutralization method. An “amphoteric/cationic polyurethane” means that the described amphoteric species is one which acts as cationic polyurethane when neutralized with an acid, e.g., lactic acid.

“Young's modulus (or the modulus of elasticity, tensile modulus)” is a measure of the stiffness of a solid polymer film. Young's modulus, E, can be calculated by dividing the tensile stress by the extensional strain in the elastic (initial, linear) portion of the stress-strain curve. The Young's modulus of the cationic polyurethane can be determined by a protocol defined to measure mechanical properties, and is developed in reference to ASTM D638, ASTM D412, test guidelines as described below in Example 2.

The “elongation at break (also known as fracture strain, ultimate elongation)” is the ratio between changed length and initial length after breakage of the solid polymer film. The elongation at break of the cationic polyurethane can be determined by a protocol defined to measure mechanical properties, and is developed in reference to ASTM D638, ASTM D412, test guidelines as described below in Example 2.

The “moisture uptake” is the measure of water adsorbed by the solid polymer film. The method for determining the moisture uptake of the solid polymer film is provided in Example 3.

The “sensory score” is determined by the performance of the hair fixative. In particular, the tress with the composition applied is blow dried for 90 seconds. The tresses are prepared in duplicate and blinded randomly and evaluated for natural feeling and overall sensory attributes on a scale of −2 to 2 by trained sensory analysts under blinded conditions. Sensory analysts are licensed hair stylists and cosmetic scientists with significant long-term experience evaluating sensory attributes of hair. Sensory analysts assign a score of −2 to tresses deemed entirely undesirable, a score of +2 to entirely soft, natural feeling and appearing hair, and intermediate scores between these two extremes.

As used herein, “preserving hair color”, “reducing the loss of hair color”, “reducing color loss in dyed hair”, or similar means i.e. the total color change (ΔE) or total chroma change (ΔC) due to hair dye loss in dyed samples treated with the disclosed composition as measured by colorimetery is less than the total color change (ΔE) or total chroma change (ΔC) in hair which has been dyed but not treated with a disclosed composition.

2. Selection Markers

Provided herein are specific combinations of WBPU properties that have been found to result in cosmetic compositions (e.g., hair products) that are capable of reducing color loss in dyed hair (e.g., human hair). Those properties include e.g., a combination of certain mechanical properties, a combination of certain chemical properties, or a combination of both mechanical and chemical properties.

Young's Modulus, Elongation at Break, and Moisture Uptake

The combination of mechanical properties described herein include the Young's modulus (e.g., above 150 MPa), the elongation at break (e.g., from about 15% to about 300%), and hydrophobicity (moisture uptake, e.g., less than 10%).

In one aspect, the Young's modulus of the cationic polyurethane should be above about 150 MPa. For example, the Young's modulus of the cationic polyurethane in the disclosed compositions may be above about 160 MPa, above about 170 MPa, above about 180 MPa, above about 190 MPa, above about 200 MPa, above about 210 MPa, above about 220 MPa, above about 230 MPa, above about 240 MPa, above about 250 MPa, above about 260 MPa, above about 270 MPa, above about 280 MPa, above about 290 MPa, above about 300 MPa, above about 310 MPa, above about 320 MPa, above about 330 MPa, above about 340 MPa, above about 350 MPa, above about 360 MPa, above about 370 MPa, above about 380 MPa, above about 390 MPa, above about 400 MPa, above about 410 MPa, above about 420 MPa, above about 430 MPa, above about 440 MPa, above about 450 MPa, above about 460 MPa, above about 470 MPa, above about 480 MPa, above about 490 MPa, above about 500 MPa, above about 510 MPa, above about 520 MPa, above about 530 MPa, above about 540 MPa, or above 550 MPa. In other aspects, the Young's modulus of the cationic polyurethane should be between about 150 MPa and about 500 MPa. For example, the Young's modulus of the cationic polyurethane in the disclosed compositions may be between about 150 MPa and about 400 MPa, between about 150 MPa and about 350 MPa, between about 170 MPa and about 390 MPa, between about 180 MPa and about 320 MPa, between about 190 MPa and about 300 MPa, between about 200 MPa and about 290 MPa, or between about 210 MPa and about 280 MPa.

In one aspect, the elongation at break of the cationic polyurethane should be from about 15% to about 300%. For example, the elongation at break of the cationic polyurethane in the disclosed composition may be from about 20% to about 300%, from about 25% to about 300%, from about 40% to about 280%, from about 100% to about 280%, from about 100% to about 250%, from about 150% to about 250%, from about 200% to about 250%, from about 210% to about 250%, about 30 to about 150%, from about 15% to about 150%, from about 150% to about 300%, from about 50% to about 250%; from about 75% to about 225%, or from about 100% to about 200%. The elongation break may be optionally combined with one or more of the Young's modulus values described in the paragraph above or any one of the Young's modulus values described in the remainder of the disclosure.

In one aspect, the moisture uptake of the cationic polyurethane should be less than about 10%. For example, the moisture uptake of the cationic polyurethane in the disclosed compositions may be less than about 9.5%, less than about 9%, less than about 8.5%, less than about 8%, less than about 7.5%, less than about 7%, less than about 6.5%, less than about 6%, less than about 5.5%, less than about 5%, less than about 4.5%, less than about 4%, less than about 3.5%, less than about 3%, less than about 2.5%, less than about 2%, less than about 1.5%, less than about 1%, less than about 0.5%, or is about 0%. In one aspect, the moisture uptake of the cationic polyurethane in the disclosed compositions should be from about 0% to about 10%. For example, the moisture uptake may be from about 0% to about 8%, from about 2% to about 8%, or from about 3% to about 7%. The moisture uptake may be optionally combined with one or more of the Young's modulus values, one or more of the elongation break values, or both as described in the paragraphs above or in the remainder of the disclosure.

As shown in the Exemplification section below, cationic polyurethanes having the Young's modulus, elongation at break, and moisture uptake described above minimize the color loss in hair which has been dyed e.g., by chemical means.

3. Methods of Use

A method of preserving hair color in color dyed human hair, the method comprising applying to the hair a composition comprising a cationic polyurethane having a Young's modulus above 150 MPa, an elongation at break from about 15% to about 300%, and a moisture uptake of less than 10%. Also provided are methods of preserving hair color in color dyed human hair, the method comprising applying to the hair a composition consisting essentially of a cationic polyurethane; a neutralizer; and an oil, wherein the cationic polyurethane has a Young's modulus above 150 MPa; an elongation at break from about 15% to about 300%; and a moisture uptake of less than 10%.

In some aspects, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y and Z]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; X is a neutralizing ion; the molecular weight of W is about 1,000 g/mol; the molar ratio of V:W is 1:0.18 to about 1:0.32; the molar ratio of V:Y is 1:0.24 to about 1:0.72; and the molar ratio of V:Z is 1:0.08 to about 1:0.47. In one alternative, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y and Z]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; X is a neutralizing ion; the molecular weight of W is about 2,000 g/mol; the molar ratio of V:W is 1:0.08 to about 1:0.18; the molar ratio of V:Y is 1:0.36 to about 1:0.82; and the molar ratio of V:Z is 1:0.08 to about 1:0.49. In another alternative, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y and Z]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; X is a neutralizing ion; the molecular weight of W is about 3,000 g/mol; the molar ratio of V:W is 1:0.05 to about 1:0.13; the molar ratio of V:Y is 1:0.4 to about 1:0.85; and the molar ratio of V:Z is 1:0.08 to about 1:0.49.

In one alternative the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y, Z, and Z¹]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; Z¹ is the product formed from ethoxylated polyol monomer; X is a neutralizing ion; the molecular weight of W is about 1,000 g/mol; the molar ratio of V:W is 1:0.19 to about 1:0.33; the molar ratio of V:Y is 1:0.19 to about 1:0.7; the molar ratio of V:Z is 1:0.08 to about 1:0.49; and the molar ratio of V:Z¹ is 1:0 to about 1:0.03. In another alternative, the cationic polyurethane in the provided compositions is a salt of the formula: [W, V, Y, Z, and Z¹]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; Z¹ is the product formed from ethoxylated polyol monomer; X is a neutralizing ion; the molecular weight of W is about 2,000 g/mol; the molar ratio of V:W is 1:0.09 to about 1:0.18; the molar ratio of V:Y is 1:0.31 to about 1:0.8; the molar ratio of V:Z is 1:0.09 to about 1:0.51; and the molar ratio of V:Z¹ is 1:0 to about 1:0.03. In another alternative, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y, Z, and Z¹]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; Z¹ is the product formed from ethoxylated polyol monomer; X is a neutralizing ion; the molecular weight of W is about 3,000 g/mol; the molar ratio of V:W is 1:0.05 to about 1:0.13; the molar ratio of V:Y is 1:0.36 to about 1:0.83; the molar ratio of V:Z is 1:0.09 to about 1:0.52; and the molar ratio of V:Z¹ is 1:0 to about 1:0.03.

In another alternative, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y, Z, and Z²]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; Z² is the product formed from hydroxylated alkyl acid monomer; X is a neutralizing ion; the molecular weight of W is about 1,000 g/mol the molar ratio of V:W is 1:0.19 to about 1:0.33; the molar ratio of V:Y is 1:0.14 to about 1:0.44; the molar ratio of V:Z is 1:0.08 to about 1:0.47; and the molar ratio of V:Z² is 1:0.05 to about 1:0.33. In another alternative, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y, Z, and Z²]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; Z² is the product formed from hydroxylated alkyl acid monomer; X is a neutralizing ion; the molecular weight of W is about 2,000 g/mol; the molar ratio of V:W is 1:0.09 to about 1:0.18; the molar ratio of V:Y is 1:0.26 to about 1:0.53; the molar ratio of V:Z is 1:0.09 to about 1:0.49; and the molar ratio of V:Z² is 1:0.05 to about 1:0.35. In another alternative, the cationic polyurethane in the provided methods is a salt of the formula: [W, V, Y, Z, and Z²]X⁻, wherein W is the product formed from polycarbonate polyol monomer; V is the product formed from polyisocyanate monomer; Y is the product formed from C_1-8alkyldiol monomer; Z is the product formed from C_1-8aminoalkyldiol monomer; Z² is the product formed from hydroxylated alkyl acid monomer; X is a neutralizing ion; and the molecular weight of W is about 3,000 g/mol; the molar ratio of V:W is 1:0.05 to about 1:0.13; the molar ratio of V:Y is 1:0.3 to about 1:0.56; the molar ratio of V:Z is 1:0.09 to about 1:0.5; and the molar ratio of V:Z² is 1:0.05 to about 1:0.35.

In yet another alternative, V is the product formed from isophorone diisocyanate monomer; Y is the product formed from 1,4-butanediol monomer; and Z is the product formed from 3-(dimethylamino)-1,2-propanediol monomer. In yet another alternative, the cationic polyurethane in the provided methods is a salt of the formula:

wherein n is 6 to 21 and m is 19 to 31.

In some aspects, the cationic polyurethane in the provided methods is selected from PU-363, PU-399, PU-400, PU-377, PU-404, PU-378, PU-383, PU-398, PU-401, PU-402, PU-403, PU-385, PU-376, PU-408, PU-409, PU-396, PU-413, PU-414, PU-362, and PU-372. In another aspect, the cationic polyurethane in the provided methods is selected from PU-362, PU-376, PU-377, PU-378, and PU-404. In yet another aspect, the cationic polyurethane in the provided methods is selected from PU-363, PU-377, and PU-378.

In some aspects, the cationic polyurethane in the provided methods is dispersed in water.

In some aspects, the cationic polyurethane in the provided methods is in the form of a particle.

In some aspects, the cationic polyurethane in the provided methods comprises uniform particles having an average particle diameter of about 20 to about 80 nm.

In some aspects, the cationic polyurethane in the provided methods comprises bimodal or multimodal particles having an average particle diameter of about 100 to about 300 nm.

In some aspects, the cationic polyurethane in the provided methods is present in an amount of 25% to 35% based on the total weight of the composition.

In some aspects, the compositions described in the provided methods further comprise a neutralizer. The neutralizer may be e.g., an acid neutralizer such as lactic acid. In some aspects, the neutralizer:C_1-8aminoalkyldiol monomer ratio is from about 0.8 to about 1.2.

In some aspects, the compositions described in the provided methods further comprise an oil. Oils can be selected from mineral, animal, plant or synthetic oils. In one aspect, the oil is linoleic acid or a mixture of fatty acids. Examples include, but are not limited to fragrance oils, emollients, monoterpenoids, fatty alcohols, fatty acids, fatty esters, fatty ethers, fluorinated small molecules (e.g., perfluoromethylcyclopentane, perfluoroperhydrophenanthrene, perfluoro-1,3-dimethylcyclohexane, perfluoromethyldecalin, and perfluoroperhydrobenzyltetralin), and mixtures thereof. In another aspect, the oil is present in an amount ranging from about 0.2 to about 1.65% based on the total weight of the composition. In another aspect, the oil is present in an amount of about 0.2 to about 0.25% based on the total weight of the composition.

In one aspect of the disclosed methods, the composition is applied prior to, during, or after the hair has been dyed. In another aspect, the composition is applied prior to or after the hair has been dyed. In yet another aspect, the composition is applied after the hair has been dyed.

In one aspect of the disclosed methods, the disclosed compositions are applied to the hair with water.

In one aspect of the disclosed methods, the disclosed compositions, when applied to the hair, change the texture and appearance.

In one aspect of the disclosed methods, the disclosed compositions, when applied to the hair, also improve hold, i.e. hair that is formed into a given curl or style retains that curl or style over time.

In one aspect of the disclosed methods, the disclosed compositions, when applied to the hair, also provide sufficient stylability i.e., the composition applied to hair supplies sufficient rigidity and flexibility to form and maintain a style.

In one aspect of the disclosed methods, the disclosed compositions, when applied to the hair, also minimize flyaways i.e., there are minimal individual hair fibers that do not conform to the given curl or style.

In one aspect of the disclosed methods, the disclosed compositions, when applied to the hair, also preserve curl shape i.e., hair that is formed into a given curl retains that curl over time.

In one aspect of the disclosed methods, the disclosed compositions, when applied to the hair, also provide natural curl enhancement i.e., hair that naturally tends to curl displays a more defined and less diffuse curl pattern.

The compositions in the disclosed methods may further comprise an antioxidant. Antioxidants that may be suitable include, but are not limited to, acai oil, alpha lipoic acid, green and white tea, retinol, vitamin C, Vitamin E, butylated hydroxytoluene, butylated hydroxyanisole, coenzyme Q10 (Co Q-10), isoflavones, polyphenols, curcumin, turmeric, pomegranate, rosemary, glutathione, selenium, and zinc.

In an exemplary aspect, an effective amount of a composition described herein may be sprayed or applied onto dry or damp hair before, during, and/or after the hair is dyed As used herein “effective amount” means an amount sufficient to provide color protection.

Also provided herein is a method for determining the color retention properties of a cosmetic composition, the method comprising the step of performing dialysis on a solution comprising the cosmetic composition and at least one color dye; and quantitatively assessing color loss over a period of time. In one aspect, “quantitatively assessing color loss over a period of time” means assessing the total color loss ΔE or total chroma loss ΔC according to formula described in Example 4, i.e.,ΔE=√{square root over ((L_x−L₀)²+(a_x−a₀)²+(b_x−b₀)²)} orΔC=√{square root over (((a_x−a₀)²+(b_x−b₀)²)}

In one aspect, the step of performing dialysis comprises placing a hair dye of interest into dialysis tubing and then placing the dialysis tubing comprising the hair dye in a reservoir bath comprising the composition of interest.

EXEMPLIFICATION

Example 1. Chemical Compositions of Cationic Waterborne Polyurethane

Cationic waterborne polyurethanes were synthesized primarily using polycarbonate diol, 1,4-butanediol (BD), isophorone diisocyanate (IPDI), and 3-(dimethylamino)-1,2-propanediol (DMAPD); selectively, the nonionic chain extenders Tegomer D3403 (ethoxylated polyether-1,3-diol) and 2,2-bis(hydroxymethyl)butyric acid (DMBA) were incorporated in cationic waterborne polyurethanes respectively to achieve desired physical properties. A mild acid, lactic acid, was used as a neutralizer. For each monomer, the molar ratio to NCO is listed in Table 1. Moreover, a beneficial oil could be also incorporated into cationic waterborne polyurethanes to provide improved sensory attributes.

TABLE 1
			Other diol	Ionic chain	Nonionic chain
		Polyol	segment	extender	extender
PU		(molar ratio	(molar ratio	(molar ratio	(molar ratio		Degree
Name	NCO	to NCO)	to NCO)	to NCO)	to NCO)	Neut.	of Neut.	Oil
363	IPDI	PCD1K_0.29	BD_0.27	DMAPD_0.45	N/A	Lactic acid	100%	N/A
399	IPDI	PCD1K_0.29	BD_0.26	DMAPD_0.44	N/A	Lactic acid	100%	N/A
400	IPDI	PCD1K_0.20	BD_0.42	DMAPD_0.38	N/A	Lactic acid	100%	N/A
377	IPDI	PCD1K_0.28	BD_0.42	DMAPD_0.30	N/A	Lactic acid	100%	N/A
404	IPDI	PCD1K_0.29	BD_0.41	DMAPD_0.30	N/A	Lactic acid	100%	N/A
378	IPDI	PCD1K_0.28	BD_0.51	DMAPD_0.21	N/A	Lactic acid	100%	N/A
383	IPDI	PCD1K_0.28	BD_0.61	DMAPD_0.12	N/A	Lactic acid	100%	N/A
398	IPDI	PCD1K_0.29	BD_0.58	DMAPD_0.12	Tegomer_0.0049	Lactic acid	100%	N/A
401	IPDI	PCD1K_0.29	BD_0.60	DMAPD_0.12	N/A	Lactic acid	100%	N/A
402	IPDI	PCD3K_0.10	BD_0.78	DMAPD_0.12	N/A	Lactic acid	100%	N/A
403	IPDI	PCD1K_0.30	BD_0.26	DMAPD_0.44	N/A	Lactic acid	80%	N/A
385	IPDI	PCD1K_0.28	BD_0.61	DMAPD_0.12	N/A	Lactic acid	110%	N/A
376	IPDI	PCD1K_0.29	BD_0.27	DMAPD_0.45	N/A	Lactic acid	100%	Linoleic acid
408	IPDI	PCD1K_0.28	BD_0.42	DMAPD_0.30	N/A	Lactic acid	100%	Linoleic acid
409	IPDI	PCD1K_0.28	BD_0.42	DMAPD_0.30	N/A	Lactic acid	100%	Mixture of FAs
396	IPDI	PCD1K_0.28	BD_0.61	DMAPD_0.12	N/A	Lactic acid	100%	Linoleic acid
413	IPDI	PCD1K_0.20	BD_0.56	DMAPD_0.25	N/A	Lactic acid	100%	N/A
414	IPDI	PCD1K_0.29	BD_0.56	DMAPD_0.16	N/A	Lactic acid	100%	N/A
362	IPDI	PCD1K_0.29	BD_0.27	DMAPD_0.22	DMBA_0.22	Lactic acid	100%	N/A
372	IPDI	PCD1K_0.29	BD_0.27	DMAPD_0.22	DMBA_0.22	Lactic acid	100%	Linoleic acid
PCD1K = polycarbonate diol with molecular weight at 1,000 g/mol; PCD3K = polycarbonate diol with molecular weight at 3,000 g/mol.

Overall, inventive cationic waterborne polyurethanes possessed optimal physical properties as defined herein: (1) Young's modulus>150 MPa, (2) Elongation at break between 15% and 300%, and (3) Water uptake (a) below 10% for WBPUs without additive (b) below 8% for WBPUs with additive. See Table 2.

TABLE 2
	Young's	Elongation at break
PU Name	Modulus (MPa)	(%)	Water Uptake (%)
363	218 ± 21	292 ± 21	8.01 ± 0.20
399	268 ± 10	255 ± 43	7.72 ± 0.26
400	326 ± 2	24 ± 23	7.55 ± 0.40
377	253 ± 10	95 ± 10	5.23 ± 0.40
404	173 ± 22	253 ± 41	5.27 ± 0.37
378	228 ± 15	163 ± 22	3.26 ± 0.33
383	198 ± 12	172 ± 48	2.46 ± 0.16
398	145 ± 11	242 ± 10	2.86 ± 0.25
402	170 ± 7	47 ± 7	1.51 ± 0.17
376	266 ± 12	307 ± 25	7.51 ± 0.21
355	318 ± 24	62 ± 21	5.91 ± 0.47
362	295 ± 10	170 ± 41	2.88 ± 0.93
372	319 ± 42	150 ± 45	2.87 ± 0.56
413	340	10	6.22 ± 0.08
414	146 ± 12	216 ± 6	3.61 ± 0.11

Particle size and distribution of cationic waterborne polyurethanes can be divided by two types. Depending on chemical compositions, one type of cationic waterborne polyurethanes showed uniform particle size distribution and average particle diameter was in the range of about 20 to about 80 nm. The other type of cationic waterborne polyurethane showed large particle size and bimodal/multimodal particle size distribution as indicated by average particle sizes in the range of 100 to approximately 300 nm and large standard deviation of particle size. See Table 3.

TABLE 3
PU   Particle Size
Name (TEM, nm)
363  29.8 ± 3.9
399  29.9 ± 4.3
400  29.6 ± 5.0
377  34.1 ± 7.5
378  36.6 ± 10.7
383  150.3 ± 112.9
398  111.2 ± 45.4
402  139.6 ± 50.6
376  21.3 ± 4.5
355  41.3 ± 18.3
362  57.0 ± 15.6
372  79.7 ± 29.7
413  60.1 ± 16.7
414  106.2 ± 25.2

Example 2. Mechanical Performance

The Young's modulus is a measure of the ability of a material to withstand changes in length when under uniaxial tension or compression. A higher Young's modulus typically indicates that the material is more rigid. The elongation at break, also known as fracture strain, is the ratio between changed length and initial length after breakage of the test specimen. A higher elongation at break expresses the capability of a material to resist fracture.

A comparison of Young's modulus and the elongation at break for the some of the polyurethanes disclosed herein was made to several commercially available polyurethane products. The Young's modulus and the elongation at break can be determined by a protocol defined to measure mechanical properties is developed in compliance with ASTM D638, ASTM D412, test guidelines. In particular, the following protocol can be used to determine the Young's modulus and elongation at break (or ultimate elongation) of dry film of polyurethanes. Testing requires approximately 10-20 min per sample to complete.

Materials:

• • >25 g polyurethane aqueous dispersion
  • 1 clean rectangular mold (2 mm×20 mm×45 mm) grooved on Teflon sheet per sample
  • 1 clean razor blade
  • Scotch tape
  • Universal Testing Machine mounted with extension grip geometry

Sample Preparation:

• • 1. Prepare 25 g of 10 wt % WBPU solution from their respective stock solution.
  • 2. Apply 2.5 mL prepared solution in each mold (2 mm×20 mm×45 mm) and allow drying for 2 days to give WBPU film.
  • 3. After it dries out, use a spatula to remove film from the mold.
  • 4. Use the razor blade to cut corners and get film with around 15 mm width and around 150-300 micron thickness. Make sure that the film is free of air bubbles.
  • 5. Label the test film.
  • 6. Cut four pieces of tape (20 mm) per sample and adhere them to both sides of the specimen strip and make a dog-bone shaped sample to improve hold of sample in grip. Store the prepared test films in desiccators for 1-2 hour to fully dry them. Take one sample out of desiccators at a time for testing.

Sample Testing

1. Balance the load registering on the universal testing machine so that it reads 0 Newtons.

2. Use calipers to set a distance of 20 mm between the top and bottom extension grip geometries.

3. Mount a sample in the extension grips and secure tightly, ensuring that the scotch tape is not visible, and that the sample is as close to vertical as possible in both vertical planes.

4. Stretch the sample slightly, by separating the geometries until a force of 2-5 N is registered.

5. Begin a tensile testing run on the universal testing machine at a speed of 100 mm/minute, stopping the test upon sample fracture.

6. Elongation at break is calculated at the elongation at which the material fractures.

7. Young's modulus is calculated as the modulus during the initial, elastic portion of deformation by calculating the slope of a linear fit to that region with an R value>0.99.

a) low modulus and high elongation (Avalure UR 450 (PPG-17/IPDI/DMPA Copolymer), C1004 (Polyurethane-35), Polyderm PE/PA ED (Polyurethane-58), Polyderm PE/PA (Polyurethane-18)), which leads to inferior curl hold (e.g., hold is temporary, transient, or short-lived) or

b) high modulus and low elongation (DynamX (Polyurethane-14 and AMP-Acrylates copolymer), DynamX/H₂O (Polyurethane-14 and AMP-Acrylates copolymer/water), Luviset PUR (Polyurethane-1)), which leads to a brittle material with low performance (e.g., resin is brittle or fractures) after manipulation.

Example 3. Hydrophobicity/Water Uptake of Polyurethane

The moisture uptake properties, under highly humid environment, of WBPU dry films have been linked to their long lasting hold performance. As such, it is important to be able to reproducibly and accurately evaluate such moisture uptake properties to enable predictive in vitro and in vivo evaluation of WBPU dry films. The following protocol can be used to determine moisture uptake ability of WBPU dry films under high humid environment. Test requires about 2-3 days per sample set to complete

Materials

• • >15 g WBPU solution
  • 1 clean cell culture petri dish (60 mm dia×15 mm H) per sample
  • Humidity chamber with flexibility to control temperature and relative humidity (RH)

Sample Testing

• • 1. Prepare 15 g of 10 wt % WBPU solution from their respective stock solution.
  • 2. Label cell culture petri dishes for each sample and measure their empty weight (W_pd).
  • 3. Apply 4 mL prepared solution in each petri dish (3 samples per WBPU and allow to equilibrate for 20 hours at 25° C. and 50% RH in humidity chamber.
  • 4. After equilibration, measure and record sample weight (W_i).
  • 5. Place the samples to humidity chamber at 25° C. and 90% RH and allow equilibration to high humidity for 20 hours.
  • 6. Measure and record final sample weight (W_f).

Sample Analysis

Calculate % moisture uptake using the following equation:

$\%\mathrm{moisture}\mathrm{uptake}=\left[\frac{\left(\left(\mathrm{Wf}-\mathrm{Wpd}\right)-\left(\mathrm{Wi}-\mathrm{Wpd}\right)\right)}{\left(\mathrm{Wi}-\mathrm{Wpd}\right)}\right]\times 100\%$

Example 4. Dye Preservation

The colorimetry data for hair dye lost in in the presence of the polyurethanes disclosed herein was gathered and compared to hair dye lost in several commercially available color protectant resins. Color loss is determined by evaluating changes in the L*, a*, and b* values for each sample, which are numerical values that can be assigned indicate a sample's color on a white/black scale (L*), a red/green scale (a*), and a blue/yellow scale (b*). The protocol used to determine color loss was gathered using a colorimeter according to the following general procedure. Testing requires approximately 5 min per sample to complete.

• • 1. Perform a calibration of the colorimeter to a pure white calibration standard.
  • 2. To analyze a solution, place a scintillation vial containing the solution on the colorimeter sample stage, and record the L*, a* and b* values.
  • 3. Repeat for all samples of interest.
  • 4. The total color loss ΔE is calculated according to the following formula:ΔE=√{square root over ((L_x−L₀)²+(a_x−a₀)²+(b_x−b₀)²)} or
  • Where L_x is the L* value of interest and L₀ is the initial L* value
  • Where a_x is the a* value of interest and a₀ is the initial a* value
  • Where b_x is the b* value of interest and b₀ is the initial b* value
  • 5. The total chroma loss ΔC is calculated according to the following formula:ΔC=√{square root over (((a_x−a₀)²+(b_x−b₀)²)}
  • Where a_x is the a* value of interest and a₀ is the initial a* value
  • Where b_x is the b* value of interest and b₀ is the initial b* value

The disclosed cationic polyurethanes were found to minimize dye loss in various polymer systems and therefore contain properties sufficient to delay or prevent dye loss from color treated hair. Here, a novel method for the evaluation of color retention, dialysis, was used to model the in vitro and in vivo color protection results obtained for the cationic WBPU. In each dialysis experiment, hair dye of interest (15 g) was suspended in dialysis tubing with a pore size of 0.5-1 kDa to mimic the pore size of biological materials such as hair keratin. The dialysis tubing was then submerged in a large reservoir bath (300 g) containing a resin of interest, such as the cationic WBPU or commercial color protectant resins. In one experiment, dialysis tubing samples was prepared containing red hair dye and then submerged in either 0.8 wt % cationic WBPU or 0.8 wt % Merquat™ 2003 PR and Merquat™ 100. Samples of the reservoir taken at different timepoints show visually that less hair dye is lost from the dialysis tubing in the presence of the cationic WBPU, compared to the Merquat mixture (FIG. 1A). Results were confirmed by a quantitative colorimetry assessment of the dye lost to the reservoir (FIG. 1B). In another experiment, dialysis tubing samples was prepared containing red hair dye and then submerged in either 5 wt % cationic WBPU or 5 wt % N-DurHance™ A-1000. Samples of the reservoir taken at different timepoints show visually that less hair dye is lost from the dialysis tubing in the presence of the cationic WBPU, compared to N-DurHance™ A-1000 (FIG. 1C). Results were confirmed by a quantitative colorimetry assessment of the dye lost to the reservoir (FIG. 1D).

During a controlled in vitro study mimicking typical dye washing, tresses dyed with red hair dye were treated with solutions containing either a cationic polyurethane or N-DurHance™ A-1000. 1.5 g tresses that were previously dyed with a red hair dye were coated with 0.5 g of 5% cationic WBPU or N-DurHance™ A-1000 solutions and left to sit for 30 seconds, and then dipped 10 times in a jar of 50 mL DI water. The cationic WBPU treatment resulted in far less dye loss (left), compared to the common color protecting polymer N-DurHance™ A-1000 (right). See FIG. 2A and FIG. 2B. The results clearly show that wash solutions containing cationic WBPU result in minimal dye loss, compared to N-DurHance™ A-1000 tress solution.

FIG. 3 illustrates the color loss data from an in vivo study in which a consumer with freshly dyed hair was subjected to extended washing and conditioning with formulations containing the disclosed cationic polyurethane on one side of their head and subjected to extended washing and conditioning with formulations without the disclosed cationic polyurethane on the other side of their head. The colorimetry data shows that the color loss over 11 days of washing, as indicated by ΔE, is reduced when using the treatments containing the cationic WBPU. A blinded, trained sensory evaluator determined that there were no detrimental visual or sensory effects observed when using treatments containing the cationic WBPU.

The contents of all references (including literature references, issued patents, published patent applications, and co-pending patent applications) cited throughout this application are hereby expressly incorporated herein in their entireties by reference. Unless otherwise defined, all technical and scientific terms used herein are accorded the meaning commonly known to one with ordinary skill in the art.

Claims

1. A method of preserving hair color in color dyed human hair, the method comprising applying to the hair a composition comprising a cationic polyurethane, wherein the cationic polyurethane is formed from W, V, Y, Z, and X,

2. The method of claim 1, wherein W is PCD1K;the molar ratio of V to W is 1:0.30, 1:0.29, 1:0.28, or 1:0.20;the molar ratio of V to Y is 1:0.61, 1:0.60, 1:0.58, 1:0.56, 1:0.51, 1:0.42, 1:0.41, 1:0.27, or 1:0.26; andthe molar ratio of V to Z is 1:0.45, 1:0.44, 1:0.38, 1:0.30, 1:0.25, 1:0.22, 1:0.21, 1:0.16, or 1:0.12.

3. The method of claim 1, wherein W is PCD3K;the molar ratio of V to W is 1:0.10;the molar ratio of V to Y is 1:0.78; andthe molar ratio of V to Z is 1:0.12.

4. The method of claim 1, wherein the cationic polyurethane further comprises ethoxylated polyether-1,3-diol (Tegomer), wherein the molar ratio of V to Tegomer is 1:0.0049.

5. The method of claim 4, wherein the molar ratio of V to W is 1:0.29; the molar ratio of V to Y is 1:0.58; and the molar ratio of V to Z is 1:0.12.

6. The method of claim 1, wherein the cationic polyurethane further comprises 2,2-bis(hydroxymethyl)butyric acid (DMBA), wherein the molar ratio of V to DMBA is 1:0.22.

7. The method of claim 6, wherein the molar ratio of V to W is 1:0.29; the molar ratio of V to Y is 1:0.27; and the molar ratio of V to Z is 1:0.22.

8. The method of claim 7, wherein the cationic polyurethane further comprises linoleic acid.

9. The method of claim 1, wherein the cationic polyurethane further comprises a mixture of fatty acids.

10. The method of claim 9, wherein the molar ratio of V to W is 1:0.28; the molar ratio of V to Y is 1:0.42; and the molar ratio of V to Z is 1:0.30.

11. The method of claim 1, wherein the cationic polyurethane further comprises linoleic acid.

12. The method of claim 11, wherein the molar ratio of V to W is 1:0.29 or 1:0.28; the molar ratio of V to Y is 1:0.61, 1:0.42, or 1:0.27; and the molar ratio of V to Z is 1:0.45, 1:0.30, or 1:0.12.

13. The method of claim 1, wherein the cationic polyurethane is dispersed in water.

14. The method of claim 1, wherein the cationic polyurethane is in the form of a particle.

15. The method of claim 1, wherein the cationic polyurethane comprises uniform particles having an average particle diameter of 20 to 80 nm.

16. The method of claim 1, wherein the cationic polyurethane comprises bimodal or multimodal particles having an average particle diameter of 100 to 300 nm.

17. The method of claim 1, wherein the cationic polyurethane is present in an amount of 25% to 35% based on the total weight of the composition.

18. The method of claim 1, wherein the composition is applied prior to, during, or after the hair has been dyed.

19. The method of claim 1, wherein the composition is applied after the hair has been dyed.

20. The method of claim 1, wherein the composition is applied to the hair with water.