This disclosure relates to polyurethanes, articles comprising the same and to methods of manufacture thereof. In particular, this disclosure relates to a fluorinated non-isocyanate urethane dimethacrylate resin.
Polyurethane is a polymer composed of a chain of organic units joined by carbamate (urethane) links. While most polyurethanes are thermosetting polymers that do not melt when heated, thermoplastic polyurethanes are also available. Polyurethane polymers are traditionally and most commonly formed by reacting a di- or polyisocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain on average two or more functional groups per molecule. Some noteworthy recent efforts have been dedicated to minimizing the use of isocyanates to synthesize polyurethanes, because the isocyanates raise severe toxicity issues. Non-isocyanate based polyurethanes (NIPUs) have recently been developed as a new class of polyurethane polymers to mitigate health and environmental concerns.
To overcome these problems, it is desirable to manufacture polyurethanes via a route that does not involve the use of isocyanates. In addition, it is desirable to functionalize these polyurethanes with functional groups that contain other atoms (e.g., fluorine, silicon, phosphorus, and the like) so as to provide the polyurethane with a range of properties that render the resulting material capable of being used in a variety of applications.
Disclosed herein a composition comprising a urethane of the
Disclosed herein too is a composition comprising a urethane of the
Disclosed herein too is an article comprising a urethane of the
Disclosed herein too is a method comprising reacting a cyclic carbonate with a diamine to form a urethane; reacting the urethane with a methacrylate to form a non-isocyanate urethane methacrylate; and functionalizing the non-isocyanate urethane methacrylate with a molecule that contains fluorine atoms, phosphorus atoms, sulfur atoms, unsaturated carboxylic acids, derivatives of unsaturated carboxylic acids, or combinations thereof.
Disclosed herein too is an article comprising a urethane of the
Disclosed herein is a non-isocyanate route to synthesizing fluorinated polyurethane methacrylates (hereinafter fluorinated polyurethane methacrylate). In an exemplary embodiment, the fluorinated polyurethane methacrylate can be functionalized with molecules that contain phosphorus atoms, silicon atoms, other reactive functionalities or even non-reactive functionalities (e.g., endcapping groups) that render important properties to the resulting molecule. These properties can involve flame retardancy, moisture uptake, abrasion resistance and the like.
In conventional polyurethane (PU) preparation processes, the polyurethane is synthesized by using isocyanates (such as diisocyanates and polyisocyanates) and polyols (such as diols or polyhydroxy polyols with high functionality) as major raw materials, but the manufacturing process of this sort usually requires phosgene which is a severely toxic pollutant. If the phosgene is leaked accidentally during the manufacturing process, the phosgene will pose an immediate threat to our environment and jeopardize our health such as causing pulmonary edema, and the manufacturing process itself will lead to a certain degree of risk. Therefore, scientists attempt to use non-isocyanates routes (which use absolutely no isocyanates at all) to manufacture polyurethane.
Polyurethanes can be manufactured by a method that involves not using any diisocyanates, wherein five-membered cyclic carbonates (Bis(cyclic carbonate)s) and primary amines are reacted at room temperature to produce a high yield of β-position hydroxyl polyurethane (2-hydroxyethylurethane), and the reaction is represented by the chemical equations shown in the
Examples of diamines that may be used in the reaction of
The reactions shown in the
The reaction between the 4-methylene-1,3-dioxolane and the non-isocyanate urethane can be conducted in a variety of different solvents. Liquid aprotic polar solvents such as water, propylene carbonate, ethylene carbonate, butyrolactone, acetonitrile, benzonitrile, nitromethane, nitrobenzene, sulfolane, dimethylformamide, N-methylpyrrolidone, or the like, or combinations comprising at least one of the foregoing solvents are generally desirable. Polar protic solvents such as, but not limited to, methanol, acetonitrile, nitromethane, ethanol, propanol, isopropanol, butanol, or the like, or combinations comprising at least one of the foregoing polar protic solvents may be used. Other non-polar solvents such a liquid carbon dioxide, supercritical carbon dioxide, benzene, toluene, methylene chloride, carbon tetrachloride, hexane, diethyl ether, tetrahydrofuran, or the like, or combinations comprising at least one of the foregoing solvents may also be used. Co-solvents comprising at least one aprotic polar solvent and at least one non-polar solvent may also be utilized. Ionic liquids, which mainly comprise the imidazolium salts, may also be utilized for swelling the polymer. An exemplary solvent for conducting the 4-methylene-1,3-dioxolane endcapping reaction is tetrahydrofuran (THF).
These endcapping reactions (seen in the
As can be seen in the
The urethanes of the
where hydroxyl or amine linkages on the urethane of formulas (I) through (XIV) are functionalized with molecules that contain fluorine atoms, phosphorus atoms, sulfur atoms, unsaturated carboxylic acids, derivatives of unsaturated carboxylic acids, or combinations thereof.
In the formulas (I) through (XIV), the bridging moieties R1, R2 and R3 can be a straight chain or branched C1-30 alkyl, a C3-30 cycloalkyl, a C6-30 aryl, C7-30 alkaryl, a C7-30 aralkyl, a C1-30 heteroalkyl, a C3-30 heterocycloalkyl, a C6-30 heteroaryl, a C7-30 heteroalkaryl, a C7-30 heteroaralkyl or a combination comprising at least one of these groups. Other definitions for the bridging moieties R1, R2 and R3 are detailed later below.
In a preferred embodiment, the bridging moieties R1, R2 and R3 can be a straight chain or branched C2-10 alkyl, a C3-10 cycloalkyl, a C6-18 aryl, C7-20 alkaryl, a C7-20 aralkyl, a C2-10 heteroalkyl, a C3-10 heterocycloalkyl, a C6-18 heteroaryl, a C7-18 heteroalkaryl, a C7-18 heteroaralkyl or a combination comprising at least one of these groups.
The functionalization of the non-isocyanate urethane with the 4-methylene-1,3-dioxolane provides the non-isocyanate urethane molecule with ring opening capabilities that can be further used to crosslink the molecule. 4-methylene-1,3-dioxolane endcapped polyurethanes can thus be used as dental resins. When used as a dental resin, ring opening polymerization conducted during the crosslinking process results in lower shrinkage when compared with other polyurethanes that are not 4-methylene-1,3-dioxolane end functionalized. In addition, by using the appropriate substituents for the functional group R1, R2 and R3 (in the
The
In one embodiment, the non-isocyanate urethane can be functionalized with unsaturated carboxylic acids are maleic acid, fumaric acid, itaconic add, acrylic acid, methacrylic acid, crotonic acid, and citraconic acid. Examples of derivatives of unsaturated carboxylic acids are maleic anhydride, citraconic anhydride, itaconic anhydride, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, glycidyl acrylate, glycidyl methacrylate, methyl acrylate anhydride or the like, or a combination thereof. Maleic anhydride is the preferred grafting compound for functionalizing the non-isocyanate urethanes.
In one exemplary embodiment, the non-isocyanate urethane can be functionalized with molecules that have fluorine atoms to provide the polyurethanes with unique functional properties. These polyurethanes are called fluorinated non-isocyanate urethane dimethacrylate resins and can be used in a variety of different applications. The manufacturing of these fluorinated non-isocyanate urethane dimethacrylate resins is detailed in the
In the
The reaction is conducted in the presence of a dichloromethane solvent and the reactants are covered in a blanket of nitrogen during the reaction. About 0.5 to 2.3 moles of the diamine are used per mole of the cyclic carbonate. The reaction temperature is 0 to 70° C., preferably 20 to 30 C.° and the reaction pressure is 0.1 atmosphere to 20 atmospheres, preferably 1 to 2 atmospheres. The reaction may be conducted in a batch or in a continuous reactor, preferably in a batch reactor. It is to be noted that other solvents listed above may also be used in lieu of or in conjunction with the dichloromethane.
The non-isocyanate urethane functionalized with the cyclic isophorondiamine of the
The dimethacrylate functionalized urethane of the
In a hydrogel formulation, the HEMA is present in an amount of 50 to 90 mole percent, preferably 60 to 80 mole percent, based upon the total number of moles of the composition. The HFMA is present in an amount of 5 to 30 mole percent, preferably 10 to 20 mole percent, based upon the total number of moles of the composition. The dimethacrylate functionalized urethane is present in an amount of 5 to 20, preferably 6 to 15 mole percent based upon the total number of moles of the hydrogel composition. The hydrogel composition may use a catalyst, an initiator and/or a curing agent as desired.
In one embodiment, the dimethacrylate functionalized urethane can be functionalized with a fluorine containing molecule to form the fluorinated non-isocyanate urethane methacrylate. The
With regard to the
The fluorinated non-isocyanate urethane methacrylate can be used in a variety of different applications. In one embodiment depicted in the
With reference now once again to the
R1 and/or R2 and/or R3 in the
-A1-Y1-A2- (1)
wherein each of the A1 and A2 is an alkyl group, a cycloalkyl group or a monocyclic divalent aryl group and Y1 is a bridging group that separates A1 and A2. In one embodiment, Y1 can comprise one or two atoms. For example, one atom may separate A1 from A2, with illustrative examples of these groups including —O—, —S—, —S(O)—, —S(O)2)—, —C(O)—, methylene, cyclohexyl-methylene, 2-[2.2.1]-bicycloheptylidene, ethylidene, isopropylidene, neopentylidene, cyclohexylidene, cyclopentadecyclidene, cyclododecylidene, and adamantylidene. The bridging group of Y1 may be a hydrocarbon group or a saturated hydrocarbon group such as methylene, cyclohexlylidene, or isopropylidene.
In another embodiment, the bridging group Y1 may contain 3 or more atoms. Examples of bridging groups that contain 3 or more atoms are C2 to C18 alkyl groups, C3 to C18 cycloalkyl groups, fused aryl groups, polymeric molecules and the like. Further details are provided below.
In one embodiment, R1 may be derived from dihydroxy compounds having the formula HO—R1—OH, wherein R1 is defined as above for formula (1). The formula HO—R1—OH includes bisphenol compounds of the formula (2):
HO-A1-Y1-A2-OH (2)
wherein Y1, A1, and A2 are as described above. For example, one atom may separate A1 and A2. Each R1 may include bisphenol compounds of the general formula (3):
where Xa is a bridging group connecting the two hydroxy-substituted aromatic groups, where the bridging group and the hydroxy substituent of each C6 arylene group are disposed ortho, meta, or para (specifically para) to each other on the C6 arylene group. For example, the bridging group Xa may be single bond, —O—, —S—, —C(O)—, or a C1-18 organic group. The C1-18 organic bridging group may be cyclic or acyclic, aromatic or non-aromatic, and can further comprise heteroatoms such as halogens, oxygen, nitrogen, sulfur, silicon, or phosphorous. The C1-18 organic group can be disposed such that the C6 arylene groups connected thereto are each connected to a common alkylidene carbon or to different carbons of the C1-18 organic bridging group. Ra and Rb may each represent a halogen, C1-12 alkyl group, or a combination thereof. For example, Ra and Rb may each be a C1-3 alkyl group, specifically methyl, disposed meta to the hydroxy group on each arylene group. The designation (e) is 0 or 1. The numbers p and q are each independently integers of 0 to 4. It will be understood that Ra is hydrogen when p is 0, and likewise Rb is hydrogen when q is 0.
Xa may be substituted or unsubstituted C3-18 cycloalkylidene, a C1-25 alkylidene of formula —C(Rc)(Rd)— wherein Rc and Rd are each independently hydrogen, C1-12 alkyl, C1-12 cycloalkyl, C7-12 arylalkyl, C1-12 heteroalkyl, or cyclic C7-12 heteroarylalkyl, or a group of the formula —C(═Re)— wherein Re is a divalent C1-12 hydrocarbon group. This may include methylene, cyclohexylmethylene, ethylidene, neopentylidene, isopropylidene, 2-[2.2.1]-bicycloheptylidene, cyclohexylidene, cyclopentylidene, cyclododecylidene, and adamantylidene. A specific example wherein Xa is a substituted cycloalkylidene is the cyclohexylidene-bridged, alkyl-substituted bisphenol of formula (4):
wherein Ra′ and Rb′ are each independently C1-12 alkyl, Rg is C1-12 alkyl or halogen, r and s are each independently 1 to 4, and t is 0 to 10. Ra′ and Rb′ may be disposed meta to the cyclohexylidene bridging group. The substituents Ra′, Rb′ and Rg may, when comprising an appropriate number of carbon atoms, be straight chain, cyclic, bicyclic, branched, saturated, or unsaturated. For example, Rg may be each independently C1-4 alkyl, Rg is C1-4 alkyl, r and s are each 1, and t is 0 to 5. In another example, Ra′, Rb′ and Rg may each be methyl, r and s are each 1, and t is 0 or 3. The cyclohexylidene-bridged bisphenol can be the reaction product of two moles of o-cresol with one mole of cyclohexanone. In another example, the cyclohexylidene-bridged bisphenol may be the reaction product of two moles of a cresol with one mole of a hydrogenated isophorone (e.g., 1,1,3-trimethyl-3-cyclohexane-5-one). Such cyclohexane-containing bisphenols, for example the reaction product of two moles of a phenol with one mole of a hydrogenated isophorone, are useful for making polycarbonate polymers with high glass transition temperatures and high heat distortion temperatures. Cyclohexyl bisphenol-containing polycarbonates, or a combination comprising at least one of the foregoing with other bisphenol polycarbonates, are supplied by Bayer Co. under the APEC® trade name.
In one embodiment, Xa is a C1-18 alkylene group, a C3-18 cycloalkylene group, a fused C6-18 cycloalkylene group, or a group of the formula —B1—W—B2— wherein B1 and B2 are the same or different C1-6alkylene group and W is a C3-12 cycloalkylidene group or a C6-16 arylene group.
In another example, Xa may be a substituted C3-18 cycloalkylidene of the formula (5):
wherein Rr, Rp, Rq, and Rt are independently hydrogen, halogen, oxygen, or C1-12 organic groups; I is a direct bond, a carbon, or a divalent oxygen, sulfur, or —N(Z)— where Z is hydrogen, halogen, hydroxy, C1-12 alkyl, C1-12 alkoxy, C6-12 aryl, or C1-12 acyl; h is 0 to 2, j is 1 or 2, i is an integer of 0 or 1, and k is an integer of 0 to 3, with the proviso that at least two of Rr, Rp, Rq and Rt taken together are a fused cycloaliphatic, aromatic, or heteroaromatic ring. It will be understood that where the fused ring is aromatic, the ring as shown in formula (5) will have an unsaturated carbon-carbon linkage at the junction where the ring is fused. When i is 0, h is 0, and k is 1, the ring as shown in formula (5) contains 4 carbon atoms; when i is 0, h is 0, and k is 2, the ring as shown contains 5 carbon atoms, and when i is 0, h is 0, and k is 3, the ring contains 6 carbon atoms. In one example, two adjacent groups (e.g., Rq and Rt taken together) form an aromatic group, and in another embodiment, Rq and Rt taken together form one aromatic group and Rr and Rp taken together form a second aromatic group. When Rq and Rt taken together form an aromatic group, Rp can be a double-bonded oxygen atom, i.e., a ketone.
Other useful dihydroxy compounds having the formula HO—R1—OH include aromatic dihydroxy compounds of formula (6):
wherein each Rh is independently a halogen atom, a C1-10 hydrocarbyl such as a C1-10 alkyl group, a halogen substituted C1-10 hydrocarbyl such as a halogen-substituted C1-10 alkyl group, and n is 0 to 4. The halogen is usually bromine.
Bisphenol-type dihydroxy aromatic and bicyclic compounds may include the following: 4,4′-dihydroxybiphenyl, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)diphenylmethane, bis(4-hydroxyphenyl)-1-naphthylmethane, 1,2-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2-(4-hydroxyphenyl)-2-(3-hydroxyphenyl)propane, bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 1,1-bis(hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxy-3 methyl phenyl)cyclohexane 1,1-bis(4-hydroxyphenyl)isobutene, 1,1-bis(4-hydroxyphenyl)cyclododecane, trans-2,3-bis(4-hydroxyphenyl)-2-butene, 2,2-bis(4-hydroxyphenyl)adamantine, (alpha, alpha′-bis(4-hydroxyphenyl)toluene, bis(4-hydroxyphenyl)acetonitrile, 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 2,2-bis(3-ethyl-4-hydroxyphenyl)propane, 2,2-bis(3-n-propyl-4-hydroxyphenyl)propane, 2,2-bis(3-isopropyl-4-hydroxyphenyl)propane, 2,2-bis(3-sec-butyl-4-hydroxyphenyl)propane, 2,2-bis(3-t-butyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2,2-bis(3-allyl-4-hydroxyphenyl)propane, 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)hexafluoropropane, 1,1-dichloro-2,2-bis(4-hydroxyphenyl)ethylene, 1,1-dibromo-2,2-bis(4-hydroxyphenyl)ethylene, 1,1-dichloro-2,2-bis(5-phenoxy-4-hydroxyphenyl)ethylene, 4,4′-dihydroxybenzophenone, 3,3-bis(4-hydroxyphenyl)-2-butanone, 1,6-bis(4-hydroxyphenyl)-1,6-hexanedione, ethylene glycol bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfone, 9,9-bis(4-hydroxyphenyl)fluorene, 2,7-dihydroxypyrene, 6,6′-dihydroxy-3,3,3′,3′-tetramethylspiro(bis)indane (“spirobiindane bisphenol”), 3,3-bis(4-hydroxyphenyl)phthalide, 2,6-dihydroxydibenzo-p-dioxin, 2,6-dihydroxythianthrene, 2,7-dihydroxyphenoxathin, 2,7-dihydroxy-9,10-dimethylphenazine, 3,6-dihydroxydibenzofuran, 3,6-dihydroxydibenzothiophene, and 2,7-dihydroxycarbazole, and the like, as well as a combination comprising at least one of the foregoing dihydroxy aromatic and bicyclic compounds.
Examples of the types of bisphenol compounds represented by formula (2) may include 1,1-bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane (hereinafter “bisphenol A” or “BPA”), 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, 1,1-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)n-butane, 2,2-bis(4-hydroxy-1-methylphenyl)propane, 1,1-bis(4-hydroxy-t-butylphenyl)propane, 3,3-bis(4-hydroxyphenyl)phthalimidine, 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (“PBPP”), 9,9-bis(4-hydroxyphenyl)fluorene, and 1,1-bis(4-hydroxy-3-methylphenyl)cyclohexane (“DMBPC”). Exemplary polymers and copolymers (that are used in the R1, R2 and/or R3 position) containing polycarbonate units may be derived from bisphenol A.
As detailed above, R1, R2 and/or R3 can be a polymer. In one embodiment, R1 is a polyolefin, a polycarbonate, a polyalkylene glycol, a polyester-carbonate, a polysiloxane, a polycarbonate-siloxane, a poly(meth)acrylate, a poly(meth)acrylate-siloxane, a polyalkyl(meth)acrylate, a polyalkyl(meth)acrylate-siloxane, a polyetherketone, a polysulfone, a polyphosphazene, a polyphosphonate, a polyimide, a polyetherimide, a polyacetal, a polyacrylic, a polystyrene, a polyester, a polyamide, a polyamideimide, a polyarylate, a polyarylsulfone, a polyethersulfone, a polyphenylene sulfide, a polyvinyl chloride, a polyfluoroethylene, a polyether etherketone, a polyether ketone, a polybenzoxazole, a polyoxadiazole, a polybenzothiazinophenothiazine, a polybenzothiazole, a polypyrazinoquinoxaline, a polypyromellitimide, a polyquinoxaline, a polybenzimidazole, a polyoxindole, a polyoxoisoindoline, a polydioxoisoindoline, a polytriazine, a polypyridazine, a polypiperazine, a polypyridine, a polypiperidine, a polytriazole, a polypyrazole, a polypyrrolidine, a polycarborane, a polyoxabicyclononane, a polydibenzofuran, a polyphthalide, a polyanhydride, a polyvinyl ether, a polyvinyl thioether, a polyvinyl alcohol, a polyvinyl ketone, a polyvinyl halide, a polyvinyl nitrile, a polyvinyl ester, a polysulfonate, a polysulfide, a polythioester, a polysulfonamide, a polyurea, a polyphosphazene, a polysilazane, or the like, or a combination thereof.
Resorbable or biodegradable polymers may also be used. These include polylactic-glycolic acid (PLGA), poly-caprolactone (PCL), copolymers of polylactic-glycolic acid and poly-caprolactone (PCL-PLGA copolymer), polyhydroxy-butyrate-valerate (PHBV), polyorthoester (POE), polyethylene oxide-butylene terephthalate (PEO-PBTP), poly-D,L-lactic acid-p-dioxanone-polyethylene glycol block copolymer (PLA-DX-PEG), or the like, or a combination thereof.
In one embodiment, R1 and/or R2 and/or R3 is preferably a polycarbonate, a polysiloxane, a polyester carbonate, a polycarbonate-siloxane or a polyester-siloxane. In an embodiment, the polysiloxane is represented by the formula (7):
wherein each R is independently a C1-13 monovalent organic group. For example, R can be a C1-C13 alkyl, C1-C13 alkoxy, C2-C13 alkenyl group, C2-C13 alkenyloxy, C3-C6 cycloalkyl, C3-C6 cycloalkoxy, C6-C14 aryl, C6-C10 aryloxy, C7-C13 arylalkyl, C7-C13 aralkoxy, C7-C13 alkylaryl, or C7-C13 alkylaryloxy. Combinations of the foregoing R groups can be used in the same copolymer.
The value of E in formula (7) can vary widely depending on the type and relative amount of each component in the flame retardant composition, the desired properties of the composition, and like considerations. Generally, E has an average value of 2 to 1,000, specifically 3 to 500, more specifically 5 to 100. Polysiloxane-carbonate copolymers may also be used in the R1 or R2 or R3 positions.
As noted above, R1 or R2 or R3 may be a polyestercarbonate, also known as a polyester-polycarbonate. The polycarbonate portion may be defined as follows in the formula (8):
where R1 is the dihydroxy compound as defined above in the formulas (1), (2) or (6) and wherein at least 60 percent of the total number of R1 groups may contain aromatic organic groups and the balance thereof are aliphatic or alicyclic, or aromatic groups.
In another embodiment, R1 and/or R2 and/or R3 is a polyester carbonate as shown in the formula (9)
wherein O-D-O is a divalent group derived from a dihydroxy compound, and D may be, for example, one or more alkyl containing C6-C20 aromatic group(s), or one or more C6-C20 aromatic group(s), a C2-10 alkylene group, a C6-20 alicyclic group, a C6-20 aromatic group or a polyoxyalkylene group in which the alkylene groups contain 2 to 6 carbon atoms, specifically 2, 3, or 4 carbon atoms. D may be a C2-30 alkylene group having a straight chain, branched chain, or cyclic (including polycyclic) structure. O-D-O may be derived from the formulas (1), (2) and (6) above. T of formula (8) may be a divalent group derived from a dicarboxylic acid, and may be, for example, a C2-10 alkylene group, a C6-20 alicyclic group, a C6-20 alkyl aromatic group, a C6-20 aromatic group, or a C6 to C36 divalent organic group derived from a dihydroxy compound or chemical equivalent thereof. In an embodiment, T is an aliphatic group. T may be derived from a C6-C20 linear aliphatic alpha-omega (α-Ω) dicarboxylic ester. Diacids from which the T group in the ester unit of formula (8) is derived include aliphatic dicarboxylic acid from 6 to 36 carbon atoms, optionally from 6 to 20 carbon atoms. The C6-C20 linear aliphatic alpha-omega (αΩ) dicarboxylic esters may be derived from adipic acid, sebacic acid, 3,3-dimethyl adipic acid, 3,3,6-trimethyl sebacic acid, 3,3,5,5-tetramethyl sebacic acid, azelaic acid, dodecanedioic acid, dimer acids, cyclohexane dicarboxylic acids, dimethyl cyclohexane dicarboxylic acid, norbornane dicarboxylic acids, adamantane dicarboxylic acids, cyclohexene dicarboxylic acids, C14, C18 and C20 diacids.
While the
The fluorinated non-isocyanate urethane dimethacrylate resin may be used to manufacture a variety of different articles. In one embodiment, the fluorinated non-isocyanate urethane dimethacrylate resin may be used as a coating to control the hydrophobicity/hydrophilicity of surfaces. In another embodiment, the fluorinated non-isocyanate urethane dimethacrylate resin may be partially functionalized with phosphoric acid to impart flame retardancy to other compositions that contain it. The inclusion of phosphonic acid can also impart the self-etching of tooth enamel and/or dentin and adhesion promotion.
In yet another embodiment, the urethane functionalized methacrylate (without the fluorine) can be partially or fully functionalized with phosphoric acid to impart flame retardancy to other compositions that contain it. Such a flame retardant composition could be made so as to be devoid of halogens. The use of polysiloxanes as R1 and/or R2 may be used for the production of non-stick article surfaces fi desired.
As stated above,
The methods and compositions disclosed herein are exemplified by the following non-limiting examples.
This example was prepared with the use of a 50:50 wt % blend of bisphenol A glycidyl methacrylate (Bis-GMA) and triethylene-glycol dimethacrylate (TEGDMA). Camphorquinone (CQ) (0.5 wt %) and 2-(dimethylamino)ethyl methacrylate (DMAEMA) (0.5 wt %) were used as a photoinitiator and accelerator respectively. The formulated resin system was mixed thoroughly by stirring for 10 min under N2 atmosphere. The formulation was injected into a mold system comprising a Teflon mold between two glass slides covered with transparent polyethylene film. Samples were irradiated with a visible light curing unit (Rembrandt-Virtuoso Phase II) for 80 seconds on each of the two sides. The wavelength of the light was between 380 and 520 nm with maximal intensity at 470 nm and light intensity was 1500 mW/cm2.
This example was prepared with the use of a 50:50 wt % blend of bisphenol A glycidyl methacrylate (Bis-GMA) and triethylene-glycol dimethacrylate (TEGDMA). Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide (1 wt %) was used as a photoinitiator. The formulated resin system was mixed thoroughly by stirring for 10 minutes under N2 atmosphere. The formulation was injected into a mold system comprising a Teflon mold between two glass slides covered with transparent polyethylene film. Samples were irradiated with a visible light curing unit (Rembrandt-Virtuoso Phase II) for 80 s on each of the two sides. The wavelength of the light was between 380 and 520 nm with maximal intensity at 470 nm and light intensity was 1500 mW/cm2.
This example was prepared with the use of a 50:50 wt % blend of nonisocyanate urethane dimethacrylate (NIPUDMA) and triethylene-glycol dimethacrylate (TEGDMA). Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide (Irgacure 819) (1 wt %) was used as a photoinitiator. The formulated resin system was mixed thoroughly by stirring for 10 min under N2 atmosphere. The formulation was injected into a mold system comprising a Teflon mold between two glass slides covered with transparent polyethylene film. Samples were irradiated with a visible light curing unit (Rembrandt-Virtuoso Phase II) for 80 s on each of the two sides. The wavelength of the light was between 380 and 520 nm with maximal intensity at 470 nm and light intensity was 1500 mW/cm2.
This example was prepared with the use of a 50:50 wt % blend of fluorinated nonisocyanate urethane dimethacrylate (NIPUDMA) and triethylene-glycol dimethacrylate (TEGDMA). Bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide (1 wt %) was used as a photoinitiator. The formulated resin system was mixed thoroughly by stirring for 10 min under N2 atmosphere. The formulation was injected into a mold system comprising a Teflon mold between two glass slides covered with transparent polyethylene film. Samples were irradiated with a visible light curing unit (Rembrandt-Virtuoso Phase II) for 80 s on each of the two sides. The wavelength of the light was between 380 and 520 nm with maximal intensity at 470 nm and light intensity was 1500 mW/cm2.
The compositions from Examples 1-4 are shown in the Table 3.
The properties of the compositions of the Examples 1-4 are shown in the Tables 4-7.
From the Tables 4-7 above, it may be seen that the hydrophobicity of the surfaces increases with the fluorination of the dimethacrylate functionalized polyurethane. From the Table 6 it may be seen that the fluorination (Example 4) increases the contact angle substantially over that displayed by non-fluorinated dimethacrylate functionalized polyurethanes (See Examples 2 and 3). In addition, from the Table 7 it may be seen that the introduction of fluorination (Example 4) reduces the glass transition temperature over that displayed by non-fluorinated dimethacrylate functionalized polyurethanes (See Examples 2 and 3). The second run in a dynamic mechanical analysis device illustrates the glass transition increases by about 10 to 15 degrees Centigrade indicating increased crosslinking.
The hydrophobicity lends the group to use in dental restorations, protective coatings, hydrophobic fibers, dental coatings to prevent decay, wire coatings, paints, etc. The unique feature is the toughness of the urethane functionality and the ability to add many different reactive groups including amines, epoxides, maleic anhydride and related functionalities to enable polymerization with radical dependent reactions. Thiol groups may be used to enhance reactions in radical polymerizations as well as protective coatings for gold.
In one embodiment, the fluorinated urethane, the phosphorylated urethane, sulfonated urethane or the anhydride terminated urethane detailed above may be blended with a polymeric resin. Polymeric resins listed above may be used. It may also be used to coat polymeric, metallic or ceramic substrates or mixtures, blends thereof. The fluorinated urethane, the phosphorylated urethane, sulfonated urethane or the anhydride terminated urethane may be crosslinked by radiation or by the use of thermal energy and can be used in coatings, dental resins, dental restoratives, thermosetting resins, or the like. Articles including the aforementioned composition are dental resins, fibers, fiber coatings, abrasion resistant coatings, protective coatings for food storage, or coatings for controlling hydrophobicity.
While this disclosure describes exemplary embodiments, it will be understood by those skilled in the art that various changes can be made and equivalents can be substituted for elements thereof without departing from the scope of the disclosed embodiments. In addition, many modifications can be made to adapt a particular situation or material to the teachings of this disclosure without departing from the essential scope thereof. Therefore, it is intended that this disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this disclosure.
This application claims the benefit of U.S. Provisional Application No. 62/016,877 filed on Jun. 25, 2014, the entire contents of which are hereby incorporated by reference in their entirety.
This invention was made with government support under Contract Number N000141310443 awarded by the Office of Naval Research. The government has certain rights in the invention.
Filing Document | Filing Date | Country | Kind |
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PCT/US15/37626 | 6/25/2015 | WO | 00 |
Number | Date | Country | |
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62016877 | Jun 2014 | US |