Flame retardant polyester composition
AssigneeSabic Global Technologies B.V.
InventorsZhenke Wei, Ying Xi, Hongtao Shi, Yegang Lin, Dake Shen
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Abstract
Disclosed herein is a method of reducing the amount of antimony flame retardant compound in a flame retardant composition which comprises using calcium oxide or a combination of talc and calcium oxide as a filler in the composition, wherein the composition comprises specific amounts of a polyester, a brominated flame retardant compound, an antimony flame retardant compound, and a filler comprising calcium oxide or a combination of talc and calcium oxide. Also disclosed are compositions prepared by such a method and articles derived therefrom.
Claims10
A method of reducing the amount of antimony flame retardant compound in a flame retardant composition which comprises using a combination of talc and calcium oxide as a filler in the composition, wherein the composition comprises:
- (a) 30 to 80 percent by weight of a polyester;
- (b) 3 to 30 percent by weight of a brominated flame retardant compound selected from the group consisting of phenoxy-terminated tetrabromobisphenol A carbonate oligomer;
- 2,4,6-tribromophenyl-terminated tetrabromobisphenol A carbonate oligomer;
- brominated polycarbonate which is a copolymer comprising units of bisphenol A and tetrabromobisphenol A, 24-29 percent bromine by weight;
- and combinations thereof;
- (c) 0.1 to 5 percent by weight of an antimony flame retardant compound;
- and
- (d) 0.01 to 5 percent by weight of a filler comprising a combination of talc and calcium oxide;
- and
- wherein
- (i) the composition meets or exceeds the requirements of UL94-V2;
- (ii) less antimony retardant compound is present in the composition as compared to a corresponding composition comprising (a), (b), (c) and no (d);
- and
- (iii) the comparative tracking index (CTI) of the composition is the same as or greater than the CTI for a corresponding composition comprising (a), (b), (c) and no (d);
- and
- wherein the percent by weight values are based on the total weight of the composition.
A flame retardant composition comprising:
- (a) 30 to 80 percent by weight of a polyester;
- (b) 3 to 30 percent by weight of a brominated flame retardant compound selected from the group consisting of phenoxy-terminated tetrabromobisphenol A carbonate oligomer;
- 2,4,6-tribromophenyl-terminated tetrabromobisphenol A carbonate oligomer;
- brominated polycarbonate which is a copolymer comprising units of bisphenol A and tetrabromobisphenol A, 24-29 percent bromine by weight;
- and combinations thereof;
- (c) 0.1 to 5 percent by weight of an antimony flame retardant compound;
- and
- (d) 0.01 to 5 percent by weight of a filler comprising a combination of talc and calcium oxide;
- and
- wherein
- (i) the composition meets or exceeds the requirements of UL94-V2;
- (ii) less antimony retardant compound is present in the composition as compared to a corresponding composition comprising (a), (b), (c) and no (d);
- and
- (iii) the comparative tracking index (CTI) of the composition is the same as or greater than the CTI for a corresponding composition comprising (a), (b), (c) and no (d);
- and
- wherein the percent by weight values are based on the total weight of the composition.
Dependencies are inferred from the claim text.