The invention relates to a process for producing mouldings by
injection moulding, the steps in the process being A) Melting a mixture made from a) a (
meth)
acrylate copolymer composed of from 40 to 100% by weight of free-radical-polymerized C1-C4-
alkyl esters of acrylic or
methacrylic acid and from 0 to 60% by weight of (
meth)
acrylate monomers having an anionic group in the
alkyl radical, where the
copolymer comprises b) from 0.1 to 3% by weight of a
release agent, and, where appropriate, the mixture may comprise c) from 0 to 50% by weight of a drier, d) from 0 to 30% by weight of a
plasticizer, e) from 0 to 100% by weight of additives or auxiliaries, f) from 0 to 100% by weight of an active pharmaceutical ingredient, g) from 0 to 20% by weight of another
polymer or
copolymer, where the amounts given for components b) to g) are based on the (
meth)
acrylate copolymer a) and the mixture prior to melting has a content of more than 0.5% by weight of low-boiling constituents with vapour pressure of at least 1.9 bar at 120° C., B) Devolatilizing the mixture in the
thermoplastic state at temperatures of at least 120° C., thereby lowering to not more than 0.5% by weight the content of the low-boiling constituents with vapour pressure of at least 1.9 bar at 120° C., C) Injecting the molten and devolatilized mixture into the mould cavity of an injection mould, the temperature of the mould cavity being below the
glass transition temperature of the (meth)
acrylate copolymer by at least 10° C., cooling the molten mixture, and removing the
resultant moulding from the mould.