Poly (pentabromobenzyl acrylate) having specific properties

Patent metadata

Field	Value
Publication number	US-9493584-B2
Application number	US-201314435312-A
Country	US
Kind code	B2
Filing date	Oct 17, 2013
Priority date	Oct 17, 2012
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Poly (pentabromobenzyl acrylate) having weight average molecular weight (Mw) in the range from 4,000 to 120,000 and polydispersity index of less than 10 as determined by high temperature gel permeation chromatography, wherein the glass transition temperature of the poly (pentabromobenzyl acrylate) is not more than 150 C.°, the poly (pentabromobenzyl acrylate) includes chains which are terminated by an end group derived from a chain length regulator, wherein the end group is a thiol group —SR 1 , and wherein R 1 , is a linear or branched alkyl group composed of not less than 8 carbon atom.

First claim

The invention claimed is:

1. Poly (pentabromobenzyl acrylate) having weight average molecular weight (Mw) in the range from 4,000 to 120,000 and polydispersity index of less than 10 as determined by high temperature gel permeation chromatography, wherein the glass transition temperature of the poly (pentabromobenzyl acrylate) is not more than 150 C.°, the poly (pentabromobenzyl acrylate) comprising chains which are terminated by an end group derived from a chain length regulator, wherein the end group is a thiol group —SR 1 , and
wherein R 1 is a linear or branched alkyl group composed of not less than 8 carbon atom.

2. Poly (pentabromobenzyl acrylate) according to claim 1 , wherein the Mw is in the range from 4,000 to 90,000, the polydispersity index is between 2 and 10 and the glass transition temperature is between 20 and 150° C.

3. Poly (pentabromobenzyl acrylate) according to claim 2 , wherein the Mw is in the range from 4,000 to 30,000 and the glass transition temperature is between 20 and 135° C.

4. Poly (pentabromobenzyl acrylate) according to claim 2 , wherein the Mw is in the range from 30,000 to 90,000 and the glass transition temperature is between 135 and 150° C.

5. Poly (pentabromobenzyl acrylate) according to claim 4 , wherein the Mw is in the range from 40,000 to 90,000 and the glass transition temperature is between 140 and 150° C.

6. Poly (pentabromobenzyl acrylate) according to claim 1 , wherein the end group is —S(CH 2 ) n CH 3 with n ranging from 8 to 20.

7. A formulation which comprises a flammable material and the poly (pentabromobenzyl acrylate) as defined in claim 1 as a flame retardant.

8. A formulation according to claim 7 , wherein the flammable material is a polypropylene copolymer or impact modified polypropylene.

9. A formulation according to claim 8 , which further comprises antimony trioxide, wherein the bromine content of the formulation is in the range from 7 to 10 wt % and and a weight ratio of bromine to Sb 2 O 3 is less than 4.

10. A formulation according to claim 8 , which is a talc-free formulation, comprising poly (pentabromobenzyl acrylate) having weight average molecular weight (Mw) in the range from 4,000 to 30,000 and polydispersity index of between 2 and 10 as determined by high temperature gel permeation chromatography, wherein the glass transition temperature of the poly (pentabromobenzyl acrylate) is between 20 and 135° C. and antimony trioxide, such that the combined concentration of bromine and antimony trioxide relative to the total weight of the formulation is less than 34 wt %, with a weight ratio of bromine to Sb 2 O 3 being not more than 2.

11. A formulation according to claim 7 , wherein the flammable material comprises a styrene-containing polymer or copolymer.

12. A formulation according to claim 11 , wherein the styrene-containing copolymer is selected from the group consisting of high-impact polystyrene (HIPS) and acrylonitrile butadiene styrene (ABS), wherein said formulation further comprises antimony trioxide at weight concentration of not more than 1.5 wt %.

13. A formulation according to claim 7 , wherein the flammable material is a textile product.

14. A formulation according to claim 13 , wherein the poly (pentabromobenzyl acrylate) has a weight average molecular weight (Mw) in the range from 30,000 to 90,000 and polydispersity index of between 2 and 10 as determined by high temperature gel permeation chromatography, wherein the glass transition temperature of the poly (pentabromobenzyl acrylate) is between 135 and 150° C.

15. A composition comprising poly (pentabromobenzyl acrylate) according to claim 1 , an aqueous carrier and a polymer binder, and optionally one or more additives selected from the group consisting of wetting agents, dispersants and thickeners.

16. A method for reducing the flammability of a textile product, comprising applying poly (pentabromobenzyl acrylate) of claim 4 to said product by padding or coating a surface of said product.

Assignees

• Bromine Compounds Ltd

Inventors

• Croitoru Bertha
• Beruben Dov
• Peled Michael
• Rachmilevitch Yaakov
• Hirschsohn Yaniv
• Epshtein Assor Yelena
• Rapaport Ella
• Kopel Dan

Classifications

• D06M2200/30

  Flame or heat resistance, fire retardancy properties · CPC title

• C08L33/14

  of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen · CPC title

• C08L23/14

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08F212/08

  Styrene · CPC title

• C08L2203/12

  used for fibers · CPC title