Daicel Chemical Industries, Ltd.

Michio Kobayashi

Kazunobu Tanaka

A flame-retardant thermo-plastic resin composition comprising a fluororesin, an aromatic polycarbonate, a styrenic resin (B) comprising at least a rubber-modified styrenic resin and a phosphate ##STR1## wherein (i) at least one of R.sup.1 to R.sup.4 is a 2,6-dialkylphenyl group, A is a phenylene group and n denotes an integer of 1 or 2.

Flame-retardant resin composition

A flame-retardant of an aromatic phosphoric acid ester of formula (I) and a fluororesin such as polytetrafluoroethylene, are added to a mixture of an aromatic polycarbonate and a styrenic resin: ##STR1## wherein (i) at least one of R.sup.1 to R.sup.4 is a 2,3-dialkylphenyl group, a 3,4-dialkylphenyl group or a 3,5-dialkylphenyl group each substituted with alkyl groups each having 1 to 3 carbon atoms, A is a phenylene group, n denotes an integer of 0 to 5, and R.sup.1 to R.sup.4 contain the dialkylphenyl group and a monoalkylphenyl group in a ratio of the former/the latter is 50/50 to 90/10 (% by weight); or (ii) at least one of R.sup.1 to R.sup.4 is a phenyl group substituted with 1 to 5 alkyl groups each having 1 to 4 carbon atoms, A is 1,3-phenylene group and n denotes an integer of 1 to 5. The flame-retardant may be a mixture of the compound (i) and the compound (ii).

A flame-retardant (C) of a nuclearly alkylated aromatic phosphoric acid ester of the following formula (I) and a fluororesin (D) such as polytetrafluoroethylene are added to 100 parts by weight of a mixture of thermoplastic resins comprising an aromatic polycarbonate (A) and a styrenic resin (B) comprising at least a rubber-modified styrenic resin: ##STR1## wherein (i) at least one of R.sup.1 to R.sup.4 is either a 2,3-, a 3,4-, or 3,5-dialkylphenyl group, each alkyl group having 1 to 3 carbon atoms, A is a phenylene group, n denotes an integer of 0 to 5, and R.sup.1 to R.sup.4 contain both the dialkylphenyl group and a monoalkylphenyl group; or (ii) at least one of R.sup.1 to R.sup.4 is a phenyl group substituted with 1 to 5 alkyl groups each having 1 to 4 carbon atoms, A is 1,3-phenylene group and n denotes an integer of 1 to 5. The flame-retardant (C) may be a mixture of the compound (i) and the compound (ii).

A resin composition is resistant to heat and impact and comprises (a) a polyphenylene ether resin, (b) a rubber graft copolymer resin obtained from a rubbery polymer having a glass transition temperature of 0.degree. C. or lower, an aromatic vinyl monomer and an alpha, beta-unsaturated dicarboxylic anhydride monomer and (c) a block copolymer of an aromatic vinyl monomer and an aliphatic diene monomer. It may contain a mono-olefinic monomer having a nitril or carboxylic ester group as the rubber graft copolymer resin.

Growing community of inventors

Sakai, Japan

Michio Kobayashi