Patent ID: 8008374

Claim:
Process for the preparation of a polymer P having amide and ester groups in a solid state of aggregation, comprising: (a) reacting a homo- or copolymer P1 of (meth)acrylic acid, itaconic acid or crotonic acid with at least one monohydroxy compound E at a temperature of up to 200° C. to give a polymer P2 so that anhydride groups form in addition to ester groups, (b) cooling the polymer P2 prepared in step (a) to below 60° C. so that the polymer P2 is present in the solid state of aggregation or as a supercooled melt, (c) amidating the polymer P2 having anhydride groups and present in the solid state of aggregation or as a supercooled melt with at least one amine compound A at a temperature below 60° C., the amine compound A used in step (c) being present in the solid state of aggregation or on or in a solid carrier material.