Patent ID: 7160558

Claim:
A process for producing a coating and binding agent comprising: (a) 50 to 90% by weight, of a copolymer comprising free-radical-polymerized C1 to C4 esters of acrylic or methacrylic acid and (meth)acrylate monomers which contain functional tertiary amino groups, wherein the copolymer is present in powder form having an average particle size of 1–40 μm, (b) 3 to 15% by weight, based on (a), of an emulsifier having an HLB of at least 14, and (c) 5 to 50% by weight, based on (a), of a C 12 - to C 18 -monocarboxylic acid or a CH 3 (CH 2 ) n OH compound where n is from 11 to 17, said process comprising, blending or mixing (a), (b) and (c) with or without addition of water, a pharmaceutical active compound, one or more additives or mixtures thereof, and forming the coating and binding agent by melting, casting, spreading, spraying or granulating, wherein the coating and binding agent has a water vapor permeability of at most 300 (g/m 2 /d) as measured according to DIN 53 122.