COATING COMPOSITION

Abstract

The invention refers to a coating composition which, calculated on dry weight, is comprising at least 20% by weight polyvinyl alcohol and 0.1 to 20% by weight, calculated on the weight of the polyvinyl alcohol, of a water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups, wherein the viscosity of an aqueous dispersion comprising that coating composition with 25% (w/w) solid content at 22° C. is 200 mPa·s or less.

Description

TECHNICAL FIELD

The invention discloses a coating composition which, calculated on dry weight, is comprising at least 20% by weight polyvinyl alcohol and 0.1 to 20% by weight, calculated on the weight of the polyvinyl alcohol, of a water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups, wherein the viscosity of an aqueous dispersion comprising that coating composition with 25% (w/w) solid content at 22° C. is 200 mPa·s or less.

TECHNICAL BACKGROUND

WO 2010/132204A1 describes an immediate release film coating composition with enhanced moisture barrier properties comprising polyvinyl alcohol, a polymer with pH dependent solubility, and optionally a plasticizer and/or a glidant. The polymer with pH dependent solubility may be for instance hydroxypropylmethyl cellulose acetate succinate (HPMC-AS) or EUDRAGIT® L100-55.

OBJECT OF THE INVENTION

WO 2010/132204A1 describes an immediate release film coating composition with enhanced moisture barrier properties. However it was found that the viscosity of the polymer composition is comparatively high what is considered to be of disadvantage in spray coating applications. Furthermore it was found that the presence of a polymer with pH dependent solubility in the coating of a coated core may negatively influence the stability of acid labile compounds in the core due its acidic nature. Thus it was an object of the present invention when starting from WO 2010/132204A1 to provide an alternative composition with improved viscosity parameters and improved conditions that may influence the stability of active ingredients included.

The problem was solved as claimed.

DETAILS OF THE INVENTION

Coating Composition

The invention refers to a coating composition which, calculated on dry weight, is comprising at least 20% by weight polyvinyl alcohol and 0.1 to 20% by weight, calculated on the weight of the polyvinyl alcohol, of a water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups, wherein the viscosity of an aqueous dispersion comprising that coating composition with 25% (w/w) solid content at 22° C. is 200 mPa·s or less.

The invention refers to a coating composition which, calculated on dry weight, may comprise at least 20, at least 30, at least 40, at least 50, at least 60, at least 70, at least 80% by weight polyvinyl alcohol. The coating composition may comprise 20 to 80, 30 to 70, 40 to 60% by weight polyvinyl alcohol.

The coating composition may comprise, calculated on dry weight, 0.1 to 20, 0.2 to 10, 0.5 to 5% by weight, calculated on the weight of the polyvinyl alcohol, of a water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups.

The coating composition may have the form of a powder, for instance with a particle size or a particle size distribution of less than 1000, less than 850, less than 150 μm, preferably in the range of 5-1000, 5 to less than 1000, 10-850, 10 to less than 850, 10-150 or 150 to less than 150 μm. The particle size or particle size distribution of the powder components may be preferably determined by particle size distribution estimation by analytical sieving according to United States Pharmacopeia (USP), preferably USP 29, method <786>. Another highly suitable measuring method is laser defraction for determination of particle size distribution. Commercial instruments permit measurement in air (Malvern Co. S3.01 Particle Sizer) or preferably in liquid media (LOT Co., Galai CIS 1).

The powder may be dispersed in water to give an aqueous dispersion.

The coating composition may have the form of an aqueous dispersion, for instance with a solid content of 5-60, 10-40 or 15 or 40% (weight/volume).

Polyvinyl alcohol and the water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups may add up to 100% (dry weight). However as a rule the coating composition may also comprise further excipients. In this case polyvinyl alcohol, the water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups and the further excipients may add up to 100% (dry weight).

Disintegration

A tablet, for instance a tablet with a diameter of 5-15 mm and a coating of 2 to 8% based on the tablet core, coated with an aqueous dispersion comprising the inventive coating composition disintegrates in an aqueous medium in 30 min or less, 20 min or less, 10 min or less or within 1 to 30 min.

Further Excipients

The coating composition may also comprise further excipients are selected from the group of antioxidants, brighteners, binding agents, flavouring agents, flow aids, fragrances, glidants, penetration-promoting agents, pigments, plasticizers, polymers, which are not a polyvinyl alcohol or a water-insoluble (meth)acrylate copolymer, pore-forming agents or stabilizers.

Disintegration

A tablet coated with an aqueous dispersion comprising the coating composition disintegrates in an aqueous medium in 30 min or less, in 20 min or less, in 15 min or less or within 1 to 30 min.

Viscosity

The viscosity of an aqueous dispersion with 25% (w/w) solid content at 22° C. is 200 mPa·s or less, 180 mPa·s or less, 150 mPa·s or less, 120 mPa·s or less, or 100 mPa·s or less. The viscosity may be preferably measured at 22° C. using Brookfield Viscometer. A 500 ml glass beaker and a spindle S61 may be used in the study and the determination may be carried out at 20 RPM.

Water-Insoluble (Meth)Acrylate Copolymer Comprising Quaternary Ammonium Groups

Water-insoluble (meth)acrylate copolymers in the sense of the invention are polymers which do not dissolve in water or are only swellable in water over of the whole range of pH 1-14.

The water-insoluble (meth)acrylate polymer may be composed of 85 to 98% by weight of free-radical polymerized C₁- to C₄-alkyl esters of acrylic or methacrylic acid and 2 to 15% by weight of alkyl(meth)acrylate monomers with a quaternary amino group in the alkyl radical.

The water-insoluble (meth)acrylate copolymer may be composed of 50 to 70% by weight of methyl methacrylate, 20 to 40% by weight of ethyl acrylate and more than 7 and up to 15% by weight of 2-trimethylammoniumethyl methacrylate chloride (type EUDRAGIT® RL).

The water-insoluble (meth)acrylate copolymer may be composed of 55 to 75% by weight of methyl methacrylate, 20-40% by weight of ethyl acrylate and 2 to 7% by weight of 2-trimethylammoniumethyl methacrylate chloride (type EUDRAGIT® RS).

Active Pharmaceutical or Nutraceutical Ingredients

The embodiments of present invention are useful for all kinds of active pharmaceutical or nutraceutical ingredients. Preferably the embodiments of present invention are useful for acid labile active pharmaceutical or nutraceutical ingredients. An acid labile pharmaceutical or nutraceutical ingredient in the sense of the invention may be characterized in that it produces impurities by degradation due to presence of acidic components. An example for an acid labile pharmaceutical ingredient is atorvastatin. The acidic compound under which influence an acid labile pharmaceutical or nutraceutical ingredient produces impurities by degradation may be an acidic substance in the coating. An acidic substance in the coating may be an acid which is added to the coating or a film coating polymer with acidic or carboxylic groups.

Active nutraceutical ingredients or nutraceuticals in general can be defined as extracts of foods claimed to have medical effects on human health. The nutraceutical is usual contained in a medical format such as capsule, tablet or powder in a prescribed dose. Examples for nutraceuticals are resveratrol from grape products as an antioxidant, soluble dietary fiber products, such as psyllium seed husk for reducing hypercholesterolemia, broccoli (sulphane) as a cancer preservative, and soy or clover (isoflavonoids) to improve arterial health. Other nutraceuticals examples are flavonoids, antioxidants, alpha-linoleic acid from flax seed, beta-carotene from marigold petals or antocyanins from berries. Sometimes the expression neutraceuticals is used as synonym for nutraceuticals.

Dosage Form

The invention discloses a dosage form, preferably an orally ingestible dosage form, comprising a core, comprising an active pharmaceutical or nutraceutical ingredient and a coating derived from a coating composition as described herein.

The dosage form may preferably comprise an active pharmaceutical or nutraceutical ingredient is acid labile.

Atorvastatin Pellets

The coating composition may be characterized in that, when used for coating of atorvastatin containing pellets, the increase in impurities measured as lactone from the initial stage (day 0) to 45 days storage in open petri dishes at 40° C. and 75% relative humidity is less than 1000, less than 500, less than 250, less than 200, less than 150 or less than 100%.

The (relative) increase of impurities is calculated by subtracting the initial value of impurities from the coated atorvastatin containing pellets from the value impurities of the coated atorvastatin containing pellets after 45 days storage in open petri dishes at 40° C. and 75% relative humidity and calculating the percentage of the this difference in comparison to the initial value (100%).

The lactone impurities of the coated formulations may be measured by HPLC or other suitable analytical methods.

Use

The invention discloses the use of a coating composition as described herein for preparing a dosage form as also described herein.

Process

The invention discloses a process for preparing a dosage form as described herein by first preparing a core comprising an active pharmaceutical or nutraceutical ingredient and subsequently applying a coating composition as described herein onto the core.

EXAMPLES

Examples with a “C” are comparative examples. Examples without a “C” are inventive examples.

Materials and Methods

PVA: Polyvinyl alcohol

Poval® 205S: is a commercially available product comprising polyvinyl alcohol.

EUDRAGIT® L 100-55 is a copolymer composed of polymerized units of 50% by weight ethyl acrylate and 50% by weight methacrylic acid.

EUDRAGIT® RL 30D is a 30% (dry substance) aqueous dispersion of a copolymer composed of polymerized units of 60% by weight of methyl methacrylate, 30% by weight of ethyl acrylate and 10% by weight of 2-trimethylammoniumethyl methacrylate chloride.

EUDRAGIT® NE 30D and Eudragit® NM 30D are 30% (dry substance) aqueous dispersions of copolymers composed of polymerized units of 30% by weight of ethyl acrylate and 70% by weight of methyl methacrylate.

Opadry® 200 is a commercially available product comprising polyvinyl alcohol, EUDRAGIT L 100-55, sodium bicarbonate, talc, titanium dioxide and/or colour.

Opadry® AMB is a commercially available product comprising polyvinyl alcohol, lecithin, talc, titanium dioxide and/or colour.

Parts A and B:

Viscosity was measured at 22° C. using Brookfield Viscometer. 500 ml glass beaker and spindle S61 was used in the study and determination was carried out at 20 RPM.

Part C:

The impurities measured as lactone in coated formulations was measured by HPLC.

The increase of impurities is calculated by subtracting the initial value of impurities from the coated atorvastatin containing pellets from the value impurities of the coated atorvastatin containing pellets after 45 days storage in open petri dishes at 40° C. and 75% relative humidity and calculating the percentage of the this difference in comparison to the initial value (100%).

Related Substances (by HPLC):

Chromatographic Conditions:

	Column	Zorbax Rx C8, 250 × 4.6 mm,
		5micron or equivalent
	Detection	UV-Visible
	Wavelength	244	nm
	Flow rate	1.5	ml/min
	Injection volume	20	μl
	Run Time	115	minutes
	Column Temperature	35°	C.
	Diluent	Water:Acetonitrile (60:40)

Mobile Phase A:

Mix Tetrahydrofuran, Acetonitrile and ammonium acetate solution in the ratio of (12:21:67).

Mobile Phase B:

Mix Tetrahydrofuran, ammonium acetate solution and Acetonitrile in the ratio of (12:27:61).

Preparation of Ammonium Acetate Solution:

Weigh about 3.9 g of Ammonium Acetate and dissolve in 1000 ml of Water and adjust pH to 5.00 with Acetic Acid.

Gradient program: Time (min)	Mobile phase A (%)	Mobile phase B (%)
0-40	100	0
40-70	100-20	0-80
70-85	20-0	80-100
85-100	0	100
100-105	0-100	100-0
105-115	100	0

Test Solution:

Weigh sample equivalent to 0.050 g of atorvastatin and transfer in to 50 ml volumetric flask. Add 30 ml diluent and sonicate for 30 min with intermittent shaking. Allow cool to room temperature. Dilute to volume with diluent.

Reference Solution:

Weigh accurately about 0.050 g of Atorvastatin calcium working standard in to 50 ml volumetric flask, dissolve and dilute to volume with diluents (stock solution). Dilute 1 ml of stock solution to 100 ml with diluent. Further, dilute 1 ml of this solution to 10 ml with diluent.

NAME	Relative Retention Time	Response Factor (RF)
Atorvastatin lactone	about 1.72	1.0

Calculation:

Calculate the % Related substances by using the below calculation formula.

$\frac{\begin{array}{c}\mathrm{Area}\mathrm{of}\mathrm{impurity}\mathrm{in}\mathrm{Test}\mathrm{solution}\times \mathrm{wt}\mathrm{of}\mathrm{standard}\times \\ 1\times 1\times 50\times 100\times \mathrm{RF}\times \mathrm{Average}\mathrm{wt}\end{array}}{\begin{array}{c}\mathrm{Mean}\mathrm{area}\mathrm{of}\mathrm{Reference}\mathrm{solution}\times 50\times \\ 100\times 10\times \mathrm{wt}\mathrm{of}\mathrm{sample}\times \mathrm{Lable}\mathrm{claim}\end{array}}$

Part D:

Moisture Protection of the Inventive Formulation at 84% Relative Humidity (RH)

Part A: Examples C1 and 2

Processing Advantage of the Inventive Formulation

Procedure for Examples C1 and 2

25% w/w dispersion were prepared with a PVA (Poval® 205S)+EUDRAGIT® L100-55 formulation (example C1, comparative according to WO 2010/132204A1, Table 1) and PVA+RL combination (example 2, inventive) under overhead stirring for 1 hour. The prepared coating dispersions were filtered through 60# sieve and sprayed onto Placebo tablets using 18″ perforated coating pan (Neocota)

TABLE 1
Example C1
PVA + EUDRAGIT ® L100-55 formulation
Ingredients         % content
Poval ® 205S        36.87
EUDRAGIT ® L100-55  4.22
PEG 3350            12.64
Talc                25.07
Titanium di oxide   21.07
Sodium bi Carbonate 0.13
Total               100.00
Water               to be added to a Solid
                    content of 25% w/w

TABLE 2
Example 2
PVA + EUDRAGIT ® RL formulation
Ingredients                      % content
Poval ® 205S                     40.29
EUDRAGIT ® RL 30 D(on dry basis) 0.8
PEG 3350                         12.64
Talc                             25.2
Titanium di oxide                21.07
Total                            100.00
Water                            to be added to a Solid
                                 content of 25% w/w

Results:

	TABLE 3
	PVA + EUDRAGIT ®	PVA + EUDRAGIT ®
	L100-55 formulation	RL 30D formulation
Solid content	25%	w/w	25%	w/w
Batch Size	4 kg Placebo tablets	4 kg Placebo tablets
Spray rate	Up to 17 gm/min-	Up to 25 gm/min- No
	processible	sticking observed
	Above 17 gm/min-
	Tablets were tacky and
	sticking observed
Viscosity	260	mPa · s	100	mPa · s

The inventive formulation of example 2 (PVA+EUDRAGIT® RL formulation) has a lower viscosity and can be sprayed at higher spray rate than the comparative formulation of example C1 (PVA+EUDRAGIT® L100-55 according to WO 2010/132204A1) without any processing problems.

Part B: Examples 3, 4, C5 and C6

Viscosity Advantage of the Inventive Formulation

Procedure:

• • 1. All ingredients were weighed accurately and mixed together in order to prepare a uniform blend.
  • 2. The prepared blend was then added in required amount of water under overhead stirring.
  • 3. Stirring was carried out for 60 minutes.
  • 4. Required quantity of pH independent EUDRAGITs (NE/NM/RS/RL) were added under stirring.
  • 5. Dispersion was filter through 60# sieve.
  • 6. Viscosity of prepared dispersions was measured at 22° C. using Brookfield Viscometer. 500 ml glass beaker and spindle S61 was used in the study and determination was carried out at 20 RPM

Formula

TABLE 4
Solid content(% w/w) = 25
	Ingredients	Solids	% content	Quantity
	Poval ® 205S	54.9	39.225493	54.9
	PEG 6000	16.46	11.760503	16.46
	Talc	37.32	26.66476136	37.32
	TiO2	31.28	22.34924264	31.28
	Water			419.88
		139.96		559.84

Results:

TABLE 5
Quantity of EUDRAGIT	Example 3	Example 4	Example C5	Example C6
(calculated on PVA)	Viscosity(mPa · s)
added into PVA	EUDRAGIT ®	EUDRAGIT ®	EUDRAGIT ®	EUDRAGIT ®
dispersion	RS 30D	RL 30D	NM 30D	NE 30D
0%	235.1	209.4	192	190.5
1%	189	117.6	192.3	187.5
2%	160.8	99.9	188.4	185.4
3%	142.8	96	186.6	177.9
4%	129.9	94.5	183.9	177.6
5%	120.3	94.2	180.9	175.5
10%	100	94	172.5	169.2

Part C: Examples 7 and C8

Active Pharmaceutical Ingredient (API) Advantage of the Inventive Formulation

Formulation Details:

1. Preparation of Atorvastatin Drug Loaded Pellets

Formula: 10% Atorvastain coating on 400 gm Sugar spheres

TABLE 6
Solid content = 10% w/w
	% on API	SOLID	QTY/BATCH
Atorvastain Calcium trihydrate		40.00	40.00
PVP K90	10.00	4.00	4.00
Butylated Hydroxy Anisol (BHA)	0.30	0.12	0.12
Methanol			397.08
Total		44.12	441.20

Procedure:

• • 1. PVP K 90 and BHA were dissolved in methanol under overhead stirring.
  • 2. Atorvastatin calcium trihydrate was then added in above solution under stirring.
  • 3. A clear solution was obtained which was used for drug loading on sugar spheres (20/25#).
  • 4. 400 gm sugar spheres were taken in GPCG Glatt 1.1 wuster coater for drug loading.
  • 5. The prepared solution was sprayed onto sugar spheres using following parameters:

Column Height: 20 mm

Plate type: B plate

Nozzle bore: 0.8 mm

Spray rate: 1-14 gm/min

Air flow: 147-160 cfm

Atomization pressure: 1-1.3 bar

Inlet temperature: 25-26° C.

Product temperature: 24-26° C.

2. Preparation of PVA+EUDRAGIT® RL 30D (on Dry Basis) Coated Atorvastatin Pellets

TABLE 7
PVA + RL formulation
Ingredients       % content
Poval ® 205S      40.29
EUDRAGIT ® RL 30D 0.8
(on dry basis)
PEG 6000          12.64
Talc              25.2
Titanium dioxide  21.07
water             Q.S. to prepare 15%
                  w/w dispersion

Procedure:

• • 1. All ingredients were mixed together and added to required quantity of water under overhead stirring.
  • 2. Stirring was carried out for 60 min
  • 3. Prepared dispersion was filtered through 60# sieve. pH of dispersion was 7.10.
  • 4. For 15% w/w solids coating on 70 gm drug loaded atorvastatin pellets, 70 gm of coating dispersion was taken.
  • 5. Coating was carried out on Mycrolab Huttlin using following parameters:

Nozzle bore: 0.6 mm

Spray rate: 0.4-0.8 gm/min

Air flow: 23-24 m³/h

Atomization pressure: 1.0 bar

Microclimate pressure: 0.6 bar

Inlet temperature: 34-43° C.

Product temperature: 30-38° C.

3. Preparation Opadry 200 Coated Atorvastatin Pellets

TABLE 8
Opadry ® 200 formulation
Ingredients % content
Opadry 200  100
Water       Q.S. to prepare 15%
            w/w dispersion

Procedure:

• • 1. Opadry 200 was added to required quantity of water under overhead stirring.
  • 2. Stirring was carried out for 60 min
  • 3. Prepared dispersion was filtered through 60# sieve. pH of dispersion was 5.79.
  • 4. For 15% w/w solids coating on 70 g drug loaded atorvastatin pellets, 70 g of coating dispersion was taken.
  • 5. Coating was carried out on Mycrolab Huttlin using following parameters:

Nozzle bore: 0.6 mm

Spray rate: 0.4 gm/min

Air flow: 23-24 m³/h

Atomization pressure: 1.0 bar

Microclimate pressure: 0.6 bar

Inlet temperature: 35-50° C.

Product temperature: 30-42° C.

Results:

Analysis of Atorvastatin Lactone in Coated Formulations:

Procedure: For this study uncoated drug loaded pellets, Poval® 205S-EUDRAGIT® RL 30D (on dry basis) coated pellets and Opadry® 200 coated pellets were analysed for initial Atorvastatin lactone impurity. All three pellets were also exposed to accelerated storage condition 40° C./75% RH in open petri for 45 days and generation of Atorvastatin lactone was determined. Following are the result of this study:

	TABLE 9
	Atorvastatin Lactone (%)
		45 days		% increase in
		40° C./75%	Difference	lactone impurity
Atorvastatin pellets	Initial	RH Open petri	in impurity	from initial
Drug loaded pellets	0.13	0.32	0.19	146.15
(Uncoated)
Poval ® 205S +	0.14	0.24	0.1	71.43
EUDRAGIT ® RL 30D
(on dry basis)
coated pellets
Opadry 200	0.15	2.08	1.93	1286.67
coated pellets

Example for a Powder Composition

Example-P1

Ingredients         % content
PVA(Fine particles) 40.29
Eudragit ® RL 30 D  0.8
PEG 6000            12.64
Talc                25.2
Titanium di oxide   21.07
Total               100

Example-P2

Ingredients            % content
PVA(coarser particles) 40.29
Eudragit ® RL 30 D     0.8
PEG 6000               12.64
Talc                   25.2
Titanium di oxide      21.07
Total                  100

• • 1. Eudragit® RL 30 D, talc and titanium dioxide were mixed together.
  • 2. PEG 6000 was mixed with above blend uniformly followed by PVA.
  • 3. Blend was dried at 50° C. for 30 min
    • Particle size analysis was carried out using USP 29 method (<786> PARTICLE SIZE DISTRIBUTION ESTIMATION BY ANALYTICAL SIEVING) by mechanical agitation.

Minimum pore size thru which
90% of particles pass
Example-P1 150 μm (US mesh #100)
Example-P2 850 μm (US mesh #20)

Part D: Examples C9, C10, C11, 12, 13 and C14

Moisture Protection of the Inventive Formulation at 84% Relative Humidity (RH)

TABLE 11
	Example C9	Example C10	Example C11	Example 12	Example 13	Example C14
	Uncoated	Opadry ® 200	PVA + L100-55	PVA + RL	PVA + RS	Opadry ® AMB
	Mean % Wt	Mean % Wt	Mean % Wt	Mean % Wt	Mean % Wt	Mean % Wt
Days	gain	gain	gain	gain	gain	gain
0	0	0	0	0	0	0
1	6.11	2.05	2.41	2.17	2.37	2.54
2	7.11	3.94	4.05	3.97	4.13	4.48
3	7.86	5.3	5.61	5.54	5.5	6.42
4	8.73	7.15	7.18	7.22	7.06	8.35
7	9.85	9.44	9.5	9.51	9.15	10.65

Discussion: Poval® 205S+EUDRAGIT® RS (PVA+RS) and Poval® 205S+EUDRAGIT® RL (PVA+RL) formulation gives comparable moisture protection to Opadry® 200 formulation.

Claims

1. A coating composition which, calculated on dry weight, is comprising at least 20% by weight polyvinyl alcohol and 0.1 to 20% by weight, calculated on the weight of the polyvinyl alcohol, of a water-insoluble (meth)acrylate copolymer comprising quaternary ammonium groups, wherein the viscosity of an aqueous dispersion comprising that coating composition with 25% (w/w) solid content at 22° C. is 200 mPa·s or less.

2. The coating composition according to claim 1, wherein further excipients add up with the polyvinyl alcohol and the water-insoluble (meth)acrylate copolymer to 100% by weight.

3. The coating composition according to claim 2, wherein the further excipients are selected from the group of antioxidants, brighteners, binding agents, flavouring agents, flow aids, fragrances, glidants, penetration-promoting agents, pigments, plasticizers, polymers, which are not a polyvinyl alcohol or a water-insoluble (meth)acrylate copolymer, pore-forming agents or stabilizers.

4. The coating composition according to claim 1, wherein the water-insoluble (meth)acrylate polymer is composed of 85 to 98% by weight of free-radical polymerized C1- to C4-alkyl esters of acrylic or methacrylic acid and 2 to 15% by weight of alkyl(meth)acrylate monomers with a quaternary ammonium group in the alkyl radical.

5. The coating composition according to claim 4, wherein the water-insoluble (meth)acrylate copolymer is composed of 55 to 75% by weight of methyl methacrylate, 20-40% by weight of ethyl acrylate and 2 to 7% by weight of 2-trimethylammoniumethyl methacrylate chloride.

6. The coating composition according to claim 4, wherein the water-insoluble (meth)acrylate copolymer is composed of 50 to 70% by weight of methyl methacrylate, 20 to 40% by weight of ethyl acrylate and more than 7 and up to 15% by weight of 2-trimethylammoniumethyl methacrylate chloride.

7. The coating composition according to claim 1, wherein, when used for coating of atorvastatin containing pellets, the increase in impurities measured as lactone from the initial stage to 45 days storage in open petri dishes at 40° C. and 75% relative humidity is less than 1000%.

8. The coating composition according to claim 1, wherein a tablet coated with an aqueous dispersion comprising the coating composition disintegrates in an aqueous medium in 30 min or less.

9. The coating composition according to claim 1, which is in the form of a powder.

10. The coating composition according to claim 1, which is in the form of an aqueous dispersion.

11. A cored dosage form comprising at least one pharmaceutical or nutraceutical ingredient and a coating derived from a coating composition according to claim 1.

12. The dosage form according to claim 11, wherein the at least one pharmaceutical or nutraceutical ingredient is acid labile.

13. The dosage form according to claim 11, wherein the pharmaceutical ingredient is atorvastatin.

14. A method for preparing a cored dosage form comprising coating at least one pharmaceutical or nutraceutical ingredient with the coating composition according to claim 1.

15. A process for preparing a dosage form according to claim 11 by first preparing a core comprising at least one pharmaceutical or nutraceutical ingredient and subsequently applying said coating composition in the form of an aqueous dispersion onto the core.