# US 5,352,739 A · Compatibilization of elastomer blends

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- Number: US 5,352,739 A
- Document ID: US5352739A
- Status: Granted
- Kind: A
- Application number: 07/972,652
- Filed: 1992-11-06
- Granted: 1994-10-04
- Earliest claimed: 1992-11-06
- Assignees: Exxon Chemical Patents Inc.
- Inventors: Palanisamy Arjunan
- Web page: https://patentgrep.com/patent/US5352739A

## CPC

- C08L 11/00: Compositions of homopolymers or copolymers of chloroprene
- C08L 9/02: Copolymers with acrylonitrile
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 23/0846: with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
- C08L 23/0853: Ethylene vinyl acetate copolymers
- C08L 51/04: grafted on to rubbers
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

This invention relates to a compatibilized rubber composition and a process for compatibilizing polar/nonpolar rubber blends comprising blending compatiblizers such as ethylene/vinyl acetate copolymer, ethylene/methacrylate copolymer EPDM or EP rubber grafted with a polar monomer such as methyl methacrylate.

## Claims

### Claim 1

A process for compatibilizing elastomer blends comprising blending:
1) polychloroprene;
2) a nonpolar elastomer of ethylene-propylene rubber (EP) or ethylene-propylene-diene rubber (EPDM); with 0.1 to 60 phr of a compatibilizer having a number average molecular weight in the range of from about 15,000 to 150,000 consisting essentially of the heptane soluble portion of a alkyl methacrylate grafted EP or EPDM, said alkyl group having 1 to 12 carbon atoms.

### Claim 2 (depends on 1)

The process of claim 1 where the nonpolar elastomer is ethylene-propylene-diene rubber.

### Claim 3 (depends on 1)

The process of claim 1 wherein the alkyl methacrylate of the modified EPDM or EP is present from 1 to 60 wt %, based upon the weight of the graft polymer.

### Claim 4 (depends on 1)

The process of claim 1 wherein the alkyl methacrylate is methyl methacrylate.

### Claim 5 (depends on 1)

The process of claim 1 wherein the compatibilizer is present in the blend from 0.1 to 15 phr.

### Claim 6 (depends on 1)

The process of claim 1 wherein the compatibilizer is present from 5 to 20 phr.

### Claim 7

A process to improve heat aged properties of a chloroprene elastomer blend comprising blending:
1) polychloroprene;
2) a nonpolar elastomer of ethylene-propylene rubber (EP) or ethylene-propylene-diene rubber (EPDM); with 0.1 to 60 phr of a compatibilizer having a number average molecular weight in the range of from about 5,000 to 150,000 consisting essentially of the heptane soluble portion of a alkyl methacrylate grafted EP or EPDM, said alkyl group having 1 to 12 carbon atoms.

### Claim 8 (depends on 1)

The process of claim 1 where the polychloroprene is present at about 10 to about 90 phr.

### Claim 9 (depends on 1)

The process of claim 1 where the nonpolar elastomer is ethylene-propylene rubber.

### Claim 10 (depends on 1)

The process of claim 1 where the nonpolar elastomer is present at about 10 to about 90 phr.

### Claim 11 (depends on 1)

The process of claim 1 where the polychloroprene is present at 30 to 80 phr, the nonpolar elastomer is present at about 15 to 50 phr and the compatibilizer is present at 1 to 30 phr.

### Claim 12 (depends on 1)

The process of claim 1 where the polychloroprene is present at 40 to 70 phr, the nonpolar elastomer is present at about 20 to 40 phr and the compatibilizer is present at 0.1 to 20 phr.