Patent ID: 7413750

Claim:
A process for producing an oral dosage form with sustained release of active ingredient, wherein the dosage form comprises a) a formulated mixture of polyvinyl acetate and polyvinylpyrrolidone which acts as a binder and a matrix former, and wherein the polyvinylpyrrolidone has a molecular weight of from 20,000 to 1,000,000, and the polyvinylpyrrolidone is finely dispersed in the polyvinyl acetate, b) at least one active ingredient, c) optionally water-soluble polymers or low or high molecular weight lipophilic additives, d) and, optionally, excipients, wherein the process comprises granulating a mixture of a) to d) or a) to c) or a) and b) and d) or a) and b) by heating to a temperature of from 40° C. to 130° C. in the absence of solvents.