# US 4,397,987 A · Nitrile rubber/EPDM graft blends

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,397,987 A
- Document ID: US4397987A
- Status: Granted
- Kind: A
- Application number: 06/422,063
- Filed: 1982-09-23
- Granted: 1983-08-09
- Earliest claimed: 1980-07-14
- Assignees: Uniroyal, Inc.
- Inventors: Robert J. Cornell
- Web page: https://patentgrep.com/patent/US4397987A

## CPC

- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08F 255/02: on to polymers of olefins having two or three carbon atoms
- C08F 279/02: on to polymers of conjugated dienes
- C08L 9/02: Copolymers with acrylonitrile
- C08L 51/04: grafted on to rubbers
- C08L 55/02: ABS [Acrylonitrile-Butadiene-Styrene] polymers
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

Oil resistant, ozone resistant polymer blends are prepared by blending an Acrylonitrile/Butadiene polymer with an EPDM polymer which has had grafted onto it a polymer prepared by polymerizing onto the backbone a methacrylate monomer. The preferred EPDM graft polymer is a methylmethacrylate grafted onto the EPDM backbone.

## Claims

### Claim 1

An elastomeric vulcanizable composition consisting essentially of:
from 50 to 90 parts, by weight, butadiene-acrylonitrile copolymer elastomer and
from 10 to 50 parts by weight, ethylene-propylene-non-conjugated diene terpolymer elastomer grafted with a monomer selected from the group consisting of alkyl acrylate and alkyl methacrylate wherein said alkyl radical in said monomer includes 1-4 carbon atoms;
wherein said total elastomeric content of said composition is in the range of 80 and 99.5% by weight.

### Claim 2 (depends on 1)

A composition in accordance with claim 1 wherein said non-conjugated diene is selected from the group consisting of dicyclopentadiene, 2-ethylidene-5-norbornene and 1,4-hexadiene.

### Claim 3 (depends on 1)

A composition in accordance with claim 1 wherein said monomer is selected from the group consisting of methyl acrylate, methyl methacrylate and butyl methacrylate.

### Claim 4 (depends on 1)

A composition in accordance with claim 1 also consisting of a vulcanizing agent present in sufficient amount to at least partially cure said composition.

### Claim 5 (depends on 1)

A composition in accordance with claim 1 wherein the degree of grafting of said monomer to said ethylene-propylene-non-conjugated diene terpolymer is in the range of between 0.02 and 0.31.