Expandable pelletized materials based on polyester

摘要

An expandable pelletized material comprising
A) a polymer matrix composed of
A1) at least 55% by weight of polyester (based on the entirety of components A1) and A2)) with a total enthalpy of fusion of up to 60 J/g, optionally of one or more melting points in the range from 100 to 300° C. and of one or more glass transition temperatures in the range from 0 to 250° C., andA2) from 0 to 45% by weight (based on the entirety of components A1) and A2)) of one or more thermoplastic polymers different from component A1);B) a physical blowing agent component, andC) optionally further additives

is suitable for producing moldable foams for use in the automobile industry, airline industry, construction industry, packaging industry, sports and leisure industry, in transport, in engineering, in lightweight construction, and/or in composite construction.

主权项

1. An expandable pelletized material having isotropic mechanical properties comprising
A) a polymer matrix composed of
A1) at least 55% by weight of polyester (based on the entirety of components A1) and A2)) based on aromatic or aliphatic dicarboxylic acids and on aliphatic or aromatic dihydroxy compounds and with a total enthalpy of fusion of up to 60 J/g, optionally of one or more melting points in the range from 100 to 300° C. and of one or more glass transition temperatures in the range from 0 to 250° C., and a mixture made of (a) 60 wt.-% to 95 wt.-% of one or more bisphenol A polycarbonates (PC) and (b) one or more polycarboxylic esters selected from polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and copolyesters thereof, and/or transesterification products of said mixture andA2) from 0 to 45% by weight (based on the entirety of components A1) and A2)) of one or more thermoplastic polymers different from component A1); B) a physical blowing agent component, and C) optionally further additives, wherein the bulk density of the expandable pelletized material is from 500 to 900 g/l and wherein the bulk density of the expandable pelletized material can exceed 900 g/l when the material comprises further additives C) as fillers and wherein the expandable pelletized material has isotropic mechanical properties.