Flame retardant polyester composition

Patent metadata

Field	Value
Publication number	US-9428643-B2
Application number	US-201214425088-A
Country	US
Kind code	B2
Filing date	Dec 13, 2012
Priority date	Dec 13, 2012
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

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.

First claim

The invention claimed is:

1. 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.

2. The method of claim 1 , wherein the polyester poly(ethylene terephthalate), poly(1,4-butylene terephthalate), or a combination thereof.

3. The method of claim 1 , wherein the antimony flame retardant compound is antimony oxide.

4. The method of reducing the amount of antimony flame retardant compound in a flame retardant composition according to claim 1 , which comprises using a combination of talc and calcium oxide as a filler in the composition, wherein the composition comprises:
(a) 65 to 70 percent by weight of the polyester;
(b) 20 to 30 percent by weight of the brominated flame retardant compound;
(c) 2 to 4 percent by weight of the antimony flame retardant compound; and
(d) 2.5 to 3.5 percent by weight of the filler.

5. The method according to claim 1 , wherein the composition comprises:
(a) 55 to 57 percent by weight of poly(1,4-butylene terephthalate);
(b) 9 to 11 percent by weight of phenoxy-terminated tetrabrombisphenol A carbonate oligomer;
(c) 1.5 to 1.7 percent by weight of Sb 2 O 3 ;
(d) 28 to 32 percent by weight of glass fiber;
(e1) 0.05 to 0.15 percent by weight of calcium oxide; and
(e2) 1.25 to 1.75 percent by weight of talc; and
wherein
(ii) less Sb 2 O 3 is present in the composition as compared to a corresponding composition comprising (a), (b), (c), (d) and no (e1) or (e2); 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), (d), and no (e1) or (e2).

6. 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.

7. The flame retardant composition of claim 6 , wherein the polyester is poly(ethylene terephthalate), poly(1,4-butylene terephthalate), or a combination thereof.

8. The flame retardant composition according to claim 7 , which comprises using calcium oxide or a combination of talc and calcium oxide as a filler in the composition, wherein the composition comprises:
(a) 65 to 70 percent by weight of a polyester;
(b) 20 to 30 percent by weight of the brominated flame retardant compound;
(c) 2 to 4 percent by weight of the antimony flame retardant compound; and
(d) 2.5 to 3.5 percent by weight of the filler.

9. The flame retardant composition of claim 6 , wherein the antimony flame retardant compound is antimony oxide.

10. An article prepared from the composition of claim 6 .

Assignees

• Sabic Global Technologies Bv

Inventors

• Wei Zhenke
• Xi Ying
• Shi Hongtao
• Lin Yegang
• Shen Dake

Classifications

• C08K3/22

  of metals · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L67/02 Primary

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title