# US 6,294,613 B1 · Compatibilized polymer blends formed using a multifunctional agent

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- Number: US 6,294,613 B1
- Document ID: US6294613B1
- Status: Granted
- Kind: B1
- Application number: 08/977,711
- Filed: 1997-11-25
- Granted: 2001-09-25
- Earliest claimed: 1996-12-18
- Assignees: ExxonMobil Chemical Patents Inc.
- Inventors: Anthony Jay Dias
- Web page: https://patentgrep.com/patent/US6294613B1

## CPC

- C08L 21/00: Compositions of unspecified rubbers
- C08L 23/283: Iso-olefin halogenated homopolymers or copolymers
- C08L 2205/08: containing additives to improve the compatibility between two polymers
- C08L 2312/00: Crosslinking
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A compatibilized blend of general purpose rubbers (GPR) and polymers containing benzylic halide groups are produced through solventless reactions utilizing a multifunctional agent containing a diene reactive group and a benzylic halo reactive group.

## Claims

### Claim 1

A compatibilized blend comprising a brominated poly(isobutylene-co-4-methylstyrene); a general purpose rubber selected from the group consisting of natural rubber, polyisoprene, polybutadiene, nitrile rubber, poly(styrene-co-butadiene), and poly(acrylonitrile-co-butadiene); and an agent selected from the group consisting of tetrabutylammonium 6,8-dithiooctanoate, tetrabutylammonium dithiopropionate, and tetrabutylammonium mercaptoacetate.

### Claim 2 (depends on 1)

The blend of claim 1, also comprising a free radical source.

### Claim 3 (depends on 2)

The blend of claim 2, wherein the free radical source is selected from the group consisting of dicumyl peroxide, di-t-butyl peroxide, benzoyl peroxide, bis p-chlorobenzoyl peroxide, t-butyl cumyl peroxide, 2,2′-azo bis(isobutyronitrile); 1,1′-azo bis(cyclohexanecarlonitrile); 4,4′-azo bis(4-cyanovaleric acid); and 2,2′-azo bis(2-amidinopropane) and mixtures thereof.

### Claim 4 (depends on 1)

The blend of claim 1, wherein the blend is formed in a single step process.

### Claim 5 (depends on 4)

The blend of claim 4, wherein the single step involves contacting the brominated poly(isobutylene-co-4-methylstyrene); the general purpose rubber selected from the group consisting of natural rubber, polyisoprene, polybutadiene, nitrile rubber, poly(styrene-co-butadiene), and poly(acrylonitrile-co-butadiene); and the agent.

### Claim 6 (depends on 1)

The blend of claim 1, wherein the blend is produced by a solventless process.