Flame-retarded styrene-containing formulations

Patent metadata

Field	Value
Publication number	US-2020277488-A2
Application number	US-201816497790-A
Country	US
Kind code	A2
Filing date	Mar 28, 2018
Priority date	Mar 30, 2017
Publication date	Sep 3, 2020
Grant date	—

Abstract

A composition comprising:
an impact modified styrene-containing polymer; at least one bromine-containing flame retardant; at least one metal hypophosphite salt M q+ (H 2 PO 2 ) q , wherein M indicates a metal cation with valence q; and at least one anti-dripping agent, wherein the total concentration of the bromine-containing flame retardant and the metal hypophosphite is less than 28% by weight based on the sum of all components in the composition, wherein the composition is antimony-free and meets UL-94 V-1/1.6 mm or UL-94 V-0/1.6 mm test requirements.

First claim

1 . A composition comprising:
an impact modified styrene-containing polymer; at least one bromine-containing flame retardant; at least one metal hypophosphite salt M q+ (H 2 PO 2 ) q , wherein M indicates a metal cation with valence q; and at least one anti-dripping agent, wherein the total concentration of the bromine-containing flame retardant and the metal hypophosphite is less than 28% by weight based on the sum of all components in the composition, wherein the composition is antimony-free and meets UL-94 V-1/1.6 mm or UL-94 V-0/1.6 mm test requirements.

2 . A composition according to claim 1 , wherein the impact modified styrene-containing polymer is selected from the group consisting of acrylonitrile-butadiene-styrene (ABS) and high impact polystyrene (HIPS).

3 . (canceled)

4 . A composition according to claim 1 , wherein the total concentration of the bromine-containing flame retardant and the metal hypophosphite is from 18 to 26% by weight.

5 . A composition according to claim 1 , wherein the bromine concentration of the composition is from 9.5 to 15.5% by weight based on the total weight of the composition.

6 . A composition according to claim 2 , wherein the concentration of the metal hypophosphite is from 2 to 9% by weight based on the total weight of the composition.

7 . A composition according to claim 2 , wherein the bromine-containing flame retardant has bromine content of 50% to 70% by weight and its bromine atoms are either all aromatically-bound or all aliphatically-bound and the metal hypophosphite is aluminum hypophosphite, calcium hypophosphite or a mixture thereof.

8 . A composition according to claim 7 , wherein the bromine-containing flame retardant is selected from the group consisting of:
(i) Tris(2,4,6-tribromophenoxy)-s-triazine represented by the following formula:

(ii) Tris(tribromoneopentyl) phosphate represented by the following formula:

iii) Tetrabromobisphenol A represented by the following formula:

iv) brominated epoxy resins and end-capped derivatives thereof, represented by the formula:

wherein m indicates degree of polymerization, R 1 and R 2 are independently selected from the group consisting of:

9 . A composition according to claim 8 , wherein the bromine-containing flame retardant is tris(2,4,6-tribromophenoxy)-s-triazine.

10 . A composition according to claim 9 , comprising from 60 to 80% by weight of ABS or HIPS, from 15 to 20% by weight of tris(2,4,6-tribromophenoxy)-s-triazine, from 3 to 9% by weight of Al(H 2 PO 2 ) 3 , Ca(H 2 PO 2 ) 2 or a mixture thereof and from 0.1 to 0.5% by weight of polytetrafluoroethylene, based on the total weight of the composition.

11 . A composition according to claim 8 , wherein the bromine-containing flame retardant is tris(tribromoneopentyl) phosphate.

12 . A composition according to claim 11 , comprising from 60 to 80% by weight of ABS, from 15 to 20% by weight of tris(tribromoneopentyl) phosphate, from 3 to 9% by weight of Al(H 2 PO 2 ) 3 , Ca(H 2 PO 2 ) 2 or a mixture thereof and from 0.1 to 0.5% by weight of polytetrafluoroethylene based on the total weight of the composition.

13 . A composition according to claim 8 , wherein the bromine-containing flame retardant is tetrabromobisphenol A.

14 . A composition according to claim 13 , comprising from 60 to 80% by weight of ABS, from 18 to 23% by weight of tetrabromobisphenol A, from 3 to 9% by weight of Al(H 2 PO 2 ) 3 , Ca(H 2 PO 2 ) 2 or a mixture thereof and from 0.1 to 0.5% by weight of polytetrafluoroethylene based on the total weight of the composition.

15 . A composition according to claim 8 , wherein the bromine-containing flame retardant is tribromophenol end-capped low-molecular weight resin represented by the following Formula (IVa) and mixtures thereof:

wherein m is an integer in the range between 0 and 5 with number-average molecular weight from 1300 to 2500.

16 . A composition according to claim 15 , comprising from 60 to 80% by weight of ABS, from 18 to 23% by weight of tribromophenol end-capped low-molecular weight epoxy resin of Formula IVa, from 3 to 9% by weight of Al(H 2 PO 2 ) 3 , Ca(H 2 PO 2 ) 2 or a mixture thereof and from 0.1 to 0.5% by weight of polytetrafluoroethylene based on the total weight of the composition.

17 . A composition according to claim 16 , wherein the composition further comprises an additive selected from the group consisting of aryl phosphate ester of hydroquinone, polydimethylsiloxane and novolac epoxy resins.

18 . A composition according to claim 17 , wherein the bromine concentration of the composition is from 10 to 15% by weight and the bromine/metal hypophosphite(s) weight ratio is greater than 2:1.

19 . A composition according to claim 18 , wherein the bromine/metal hypophosphite(s) weight ratio is from 3:1 to 7:1.

20 . A composition according to claim 17 , comprising from 60 to 80% by weight of ABS, from 15 to 20% by weight of tris(2,4,6-tribromophenoxy)-s-triazine, from 3 to 6% by weight of Al (H 2 PO 2 ) 3 , Ca(H 2 PO 2 ) 2 or a mixture thereof, from 1 to 10% by weight of a combination consisting of aryl phosphate ester of hydroquinone and at least one of polydimethylsiloxane and novolac epoxy resins, and from 0.1 to 0.5% by weight of polytetrafluoroethylene based on the total weight of the composition.

21 . (canceled)

22 . A composition according to claim 17 , comprising ABS, 10 to 15% by weight bromine supplied by the bromine-containing flame retardant, Ca(H 2 PO 2 ) 2 and polydimethylsiloxane wherein the weight ratio bromine:Ca(H 2 PO 2 ) 2 is greater than 2:1 and the weight ratio Ca(H 2 PO 2 ) 2 :polydimethylsiloxane is from 7:1 to 1:2.

23 . A composition according to claim 22 , wherein the total concentration of the Ca(H 2 PO 2 ) 2 +polydimethylsiloxane mixture is from 4 to 7% by weight based on the total weight of the composition.

24 . A composition according to claim 23 , comprising from 70 to 80% ABS, from 15 to 22.5% by weight of tris(2,4,6-tribromophenoxy)-s-triazine, from 2.0 to 5.0% by weight of Ca(H 2 PO 2 ) 2 , from 0.5 to 4.0% polydimethylsiloxane and from 0.1 to 0.5% by weight of polytetrafluoroethylene based on the total weight of the composition.

25 . A composition according to claim 16 , further comprising from 0.5 to 3% by weight of talc based on the total weight of the composition.

26 . A composition according to claim 25 , comprising from 60 to 80% by weight of ABS, from 13 to 18% by weight of tris(2,4,6-tribromophenoxy)-s-triazine, from 4 to 8% by weight of Al (H 2 PO 2 ) 3 , Ca(H 2 PO 2 ) 2 or a mixture thereof, from 0.5 to 3 talc and from 0.1 to 0.5% by weight of polytetrafluoroethylene based on the total weight of the composition.

27 . A molded article comprising the compo

Assignees

• Bromine Compounds Ltd

Inventors

• Hirschsohn Yaniv
• Eden Eyal

Classifications

• C08L55/02 Primary

  ABS [Acrylonitrile-Butadiene-Styrene] polymers · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title

• C08K5/0066

  Flame-proofing or flame-retarding additives · CPC title

• C08K5/521

  Esters of phosphoric acids, e.g. of H3PO4 · CPC title

• C08L51/04 Primary

  grafted on to rubbers · CPC title