Patent ID: 7009027
Filing Date: 2006-03-07
Classification: C08G,D01F,Y10T

Abstract:
1. A process for production of polyester block copolymers, comprising the steps of conjointly polycondening monomeric building blocks of polymers or precondensates formed form individual monomers with mono-and/or difunctionalized cyclic dicarboxylic anhydrides or their precondensates to form polyesterimide anhydrides having anhydride end and/or side groups, and reacting the polyesterimide anhydrides with the hydroxyl and/or ester grops of fusible linear polyesters to form polyester block copolymers, the fraction of the polyesterimide anhydride being in the range from 0.1 to 11.11 mass percent, relative to the weight of the fusbile linear polyester having hydroxyland/or ester groups.