GB1090932A - Acrylonitrile/butadiene/styrene resin compositions - Google Patents

Abstract

A thermoplastic composition comprises an ABS resin and (a) an alkyl ester of a carboxylic acid having a solubility parameter of from 8.5 to 9.2, or (b) a mixture of two or more esters, the mean solubility parameter of the esters being from 8.5 to 9.2. The preferred alkyl esters of aspect (a) of the invention are dialkyl esters of an aliphatic or aromatic dicarboxylic acid, the alkyl groups being straight- or branched-chain and preferably containing from 6 to 20 carbon atoms, e.g. di-n-heptyl, di-n-octyl-, di-iso-octyl-, di-tertiary-octyl-, di-2-ethylhexyl-, di-1-methyl-heptyl-, di-n-nonyl-, di-3,5,5-trimethyl-hexyl-, di-n-decyl- and di-iso-decyl adipates, pimelates, azelates and sebacates, di-n-heptyl-, di-n-octyl-, di-iso-octyl-, di-tertiary-octyl-, di-2-ethylhexyl-, di-1-methyl-heptyl-, di-3,5,5-trimethyl-hexyl-, di-n-decyl-, di-iso-decyl-, and di-tridecyl-o-phthalates, iso-phthalates and terephthalates. The mixture of esters of aspect (b) of the invention may comprise organic esters and/or inorganic esters. The preferred organic esters are as for aspect (a) of the invention, but including the succinates and glutarates. Inorganic esters include alkyl and aryl phosphates, preferably trialkyl and triaryl phosphates, and the C15 alkyl sulphonic esters of phenol and cresol, e.g. tri-iso-octyl-, tri-phenyl-, tri-tolyl-, and tri-xylyl phosphates. The esters are preferably present in amount from 2% to 20% by weight based on the ABS resin. In examples are used di-isooctyl phthalate, di-tridecyl phthalate, di-isooctyl azelate, iso-decyl ester of a mixture of succinic, glutaric and adipic acids, di-isodecyl phthalate, an equimola mixture of di-iso-octyl azelate and tri-tolyl phosphate, mixtures of tritolyl phosphate and tri-iso-octyl phosphate, 1:1 by weight mixture of di-iso-octyl azelate and di-tridecyl-phthalate. Comparative examples are given using polybutylene adipate, tri-tolyl phosphate, chlorinated paraffin and tri-isoctyl phosphate. Fillers, e.g. calcium carbonate, china clay, silica or mica, inorganic or organic pigments and anti-oxidants, e.g. phenothiazine or a substituted phenol may be added.