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US 6,284,824 B1Granted
Flame retardant polycarbonate resin compositions
AssigneesNEC Corporation, Shin-Etsu Chenical Co., Ltd.
InventorsMasatoshi Iji, Shin Serizawa, Akira Yamamoto, Masaaki Yamaya, Kenji Yamamoto, Yoshiteru Kobayashi
Life of this patent
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Abstract
A polycarbonate composition comprising an aromatic polycarbonate resin and an organopolysiloxane having a specific structure is flame retardant, evolves no harmful gases upon combustion, and is molded into parts with optical transparency.
Claims20
A flame retardant polycarbonate resin composition comprising
- (a) 100 parts by weight of an aromatic polycarbonate resin and
- (b) 1 to 10 parts by weight of an organopolysiloxane consisting essentially of 50 to 90 mol % of siloxane units T represented by R1.SiO3/2 and 10 to 50 mol % of siloxane units D represented by R2R3.SiO2/2 wherein R1, R2, and R3 are independently substituted or unsubstituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, phenyl being contained in an amount of at least 83 mol % of the entire organic substituents.
A flame retardant polycarbonate resin composition comprising
- (a) 100 parts by weight of an aromatic polycarbonate resin and
- (b′) 1 to 10 parts by weight of an organopolysiloxane consisting essentially of 0 to 89.99 mol % of siloxane units T represented by R1.SiO3/2, 10 to 50 mol % of siloxane units D represented by R2R3.SiO2/2, and 0.01 to 50 mol % of siloxane units Q represented by SiO4/2 wherein R1, R2, and R3 are independently substituted or unsubstituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, phenyl being contained in an amount of at least 83 mol % of the entire organic substituents.
A method of making a flame retardant polycarbonate resin comprising:
- providing 100 parts by weight of an aromatic polycarbonate resin prepared by reacting a dihydric phenol with a phosgene or a carbonate diester;
- mixing 1 to 10 parts by weight of an organopolysiloxane consisting essentially of 50 to 90 mol % of siloxane units T represented by R1.SiO3/2 and 10 to 50 mol % of siloxane units D represented by R2R3.SiO2/2 wherein R1, R2, and R3 are independently substituted or unsubstituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, phenyl being contained in an amount of at least 83 mol % of the entire organic substituents.
Dependencies are inferred from the claim text.