Patent ID: 6790887
Filing Date: 2004-09-14
Classification: C08K,C08L

Abstract:
process for imparting flame retardancy to a resin component (A) selected from the group consisting of an aromatic polycarbonate and a resin mixture of an aromatic polycarbonate and at least one organic polymer resin selected from the group consisting of aromatic vinyl polymers, olefin polymers, polyesters, polyamides, polyphenylene ethers and epoxy polymers, wherein said resin mixture has an aromatic polycarbonate content of 50% by weight or more,said process comprising adding to said resin component (A) a flame retardant (B) comprising at least one phenyl group-containing silicone compound having a linear configuration, and an additional flame retardant (C) comprising at least one member selected from the group consisting of a metal salt flame retardant, a phosphorus-containing flame retardant, a nitrogen-containing flame retardant, a silicon-containing flame retardant other than said silicone compound (B), an inorganic flame retardant and a fibrous flame retardant, said at least one phenyl group-containing silicone compound (B) comprising a polymer which is represented by the following formula (1): wherein: each of R1 and R2 independently represents a hydrogen atom, a methyl group, an ethyl group, a butyl group or a phenyl group; each of R3 and R4 independently represents a hydrogen atom, a methyl group, an ethyl group, a butyl group, a phenyl group or a silicon-containing monovalent group comprising a silicon atom having bonded thereto at least one member selected from the group consisting of a hydrogen atom, a methyl group, an ethyl group, a butyl group and a phenyl group; at least one of R1, R2, R3 and R4 is a phenyl group; and n is 100 or more in terms of the number average n value, wherein the recurring units, each represented by the following formula (3): wherein each of R1 and R2 is as defined for formula (1), are the same or different, so that said flame retardant (B) is a homopolymer or a copolymer, wherein said copolymer has a random, a block or an alternating configuration, wherein said flame retardant (B) contains said phenyl group in an amount of from 60 to 90 mole %, based on the total molar amount of R1, R2, R3 and R4; wherein said flame retardant (B) is added in an amount of from 0.1 to 10 parts by weight and said additional flame retardant (C) is added in an amount of from 0.001 to 100 parts by weight, each relative to 100 parts by weight of said resin component (A).