Patent ID: 8445576
Filing Date: 2013-05-21
Classification: C08G,C08L

Abstract:
1. A continuous process for preparation of polyalkylene arylates A) comprising hyperbranched polymers B) and, optionally, comprising lubricants C), by esterifying or transesterifying an aromatic dicarboxylic acid or its ester or ester-forming derivatives, with a molar excess of an aliphatic dihydroxy compound, and polycondensing the resultant transesterification or esterification product, which comprises, on achievement of at least 80% of a selected viscosity number, adding component B) and also, optionally, C) to the polymer melt of polyalkylene arylates A), wherein the amount of component B) added is from 0.01 to 10% by weight, based on 100% by weight of components A) to C), and, optionally, post-condensing the melt and then discharging, cooling, and pelletizing it, and also using, as component B), at least one hyperbranched polycarbonate B1) with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, Part 2), or at least one hyperbranched polyester B2) of A wherein the degree of branching for B1) and B2) is between 10 and 99.9%.