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US 5,837,757 AGranted
Flame-retardant polycarbonate compositions
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsAkio Nodera, Hiroshi Itagaki
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AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsAkio Nodera, Hiroshi Itagaki
Estimating the term…
Disclosed are non-bromine, flame-retardant polycarbonate resin compositions having increased reflectance and improved light shieldability, light fastness and moldability while still having good mechanical properties such as flame retardancy and impact resistance, and light reflectors as produced by molding the compositions. One type of the composition comprises (A) a polycarbonate resin and (B) a titanium oxide powder in a ratio by weight of from 70/30 to 90/10, and contains (C) a stilbene-bisbenzoxazole derivative in an amount of from 1 to 1000 ppm by weight and optionally (D) a non-halogen phosphate compound in an amount of from 0.05 to 1.00% by weight in term of phosphorus element, relative to the total weight of the component (A) and the component (B). The other type of the composition comprises (A) from 99.9 to 70% by weight of a polycarbonate resin and (B) from 0.1 to 30% by weight of a titanium oxide powder, and contains (D) a non-halogen phosphate compound in an amount of from 0.05 to 1.00 part by weight in term of phosphorus element, relative to 100 parts by weight of the sum of the component (A) and the component (B).
A flame retardant polycarbonate resin composition comprising (A) a polycarbonate resin and (B) a titanium oxide powder in a ratio by weight of from 70/30 to 90/10, and containing (C) a compound containing the stilbene-bisbenzoxazole group, which compound functions to increase the light reflectance of the polycarbonate resin composition, in an amount of from 1 to 1000 ppm by weight relative to the total weight of the component (A) and the component (B).
A flame-retardant polycarbonate resin composition comprising (A) a polycarbonate resin and (B) a titanium oxide powder in a ratio by weight of from 70/30 to 90/10, and containing (C) a compound containing the stilbene-bisbenzoxazole group, which compound functions to increase the light reflectance of the polycarbonate resin composition in an amount of from 1 to 1000 ppm by weight and (D) a non-halogen phosphate compound in an amount of from 0.05 to 1.00% by weight in term of phosphorus element, relative to the total weight of the component (A) and the component (B), the non-halogen phosphate compound (D) having the formula ##STR8## where R.sup.1 to R.sup.4 each represent an optionally-substituted aryl group, and these may be the same or different, X represents an optionally-substituted arylene group, c, d, e and f each represent 0 or 1 and p represents a number of from 0 to 5, and when a mixture of two or more of these phosphates is in the composition the number p represents a mean value to be derived from p in each phosphate.
A flame-retardant polycarbonate resin composition comprising (A) from 99.9 to 70% by weight of a polycarbonate resin and (B) from 0.1 to 30% by weight of a titanium oxide powder, and containing (D) a non-halogen phosphate compound in an amount of from 0.05 to 1.00 part by weight in term of phosphorus element, relative to 100 parts by weight of the sum of the component (A) and the component (B), the non-halogen phosphate compound (D) having the formula ##STR9## where R.sup.1 to R.sup.4 each represent an optionally-substituted aryl group, and these may be the same or different, X represents an optionally-substituted arylene group, c, d, e and f each represent 0 or 1, and p represents a number of from 0 to 5, and when a mixture of two or more of these phosphates is in the composition, the number p represents a mean value to be derived from p in each phosphate.
Dependencies are inferred from the claim text.