METHOD OF IMPROVING FLOW PROPERTIES OF POLYMER MELTS

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a method of improving flow properties of a melt comprising a thermoplastic polymer, which includes adding to a composition of said thermoplastic polymer before or during treatment of the melt 0.005-0.5 wt %, relative to the weight of the thermoplastic polymer, of one or more comb copolymers or comb block copolymers which are obtained at a first step a) by free-radical polymerisation of an alkyl ester of acrylic or methacrylic acid with 1-10 carbon atoms in the alkyl group and, optionally, one or more monomers without an ester bond, and at a second step b) by modification in a polymer analogous transesterification reaction with a primary or secondary alcohol to form a comb or comb block copolymer. The object of the invention is also the use of said comb copolymers or comb block copolymers to improve flow properties of a melt comprising a thermoplastic polymer.;EFFECT: obtained comb copolymers or comb block copolymers reduce power consumption required for processing thereof, and reduce the risk of abruptions in the melt at high shearing rates.;13 cl, 15 tbl, 39 ex