# US 2014/0155537 A1 · Heat resistant hydrocarbon elastomer compositions

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- Number: US 2014/0155537 A1
- Document ID: US20140155537A1
- Status: Published application
- Kind: A1
- Application number: 14/085,260
- Filed: 2013-11-20
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: E I Du Pont De Nemours and Company
- Inventors: Steven R. Oriani
- Web page: https://patentgrep.com/patent/US20140155537A1

## CPC

- C08L 23/083: {with aliphatic polyenes, i.e. containing two or more carbon-to-carbon double bonds}
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- C08L 23/0846: with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Disclosed herein is a curable composition comprising ethylene copolymer elastomer, a relatively small amount of a polyamide, and optionally a compatibilizer wherein curable composition demonstrates improved heat aging properties without the loss of tensile strength. Also disclosed is the process for making such curable ethylene copolymer elastomer.

## Claims

### Claim 1

A curable elastomer composition, said composition comprising:
(a) ethylene copolymer elastomer;
(b) a polyamide having a melting peak temperature of about or greater than about 160° C. as determined by ASTM D3418-08, wherein said polyamide is present in at least an effective amount to improve hot air aging, but not more than 5 phr;
(c) a curative; and
(d) optionally, compatibilizer.

### Claim 2 (depends on 1)

The composition of claim 1 wherein said ethylene copolymer elastomer comprises (i) copolymerized units of ethylene with alpha-olefins wherein the ethylene content is about or less than 75 wt %.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the polyamide is present at a level from 0.1 phr to 5 phr.

### Claim 4 (depends on 1)

The composition of claim 1 wherein the polyamide is present at a level from 0.5 phr to 4 phr polyamide.

### Claim 5 (depends on 1)

The composition of claim 1 wherein the polyamide is present at a level from 1 phr to 3 phr polyamide.

### Claim 6 (depends on 1)

The composition of claim 1 wherein said polyamide is selected from the group consisting of nylon 6, nylon 6/6, and Group IV polyamides having a melting peak temperature less than about 270° C.

### Claim 7 (depends on 6)

The composition of claim 6 wherein said polyamide is selected from the group consisting of nylon 6, nylon 6/6.

### Claim 8 (depends on 1)

The composition of claim 1 wherein a compatibilizer is present.

### Claim 9 (depends on 8)

The composition of claim 8 wherein said compatibilizer (i) is a polymer comprising ethylene and an amine or acid reactive moiety.

### Claim 10 (depends on 8)

The composition of claim 8 wherein the compatibilizer is a maleic anhydride grafted ethylene alpha-olefin.

### Claim 11 (depends on 1)

The composition of claim 1 wherein said curative is a peroxide curative.

### Claim 12 (depends on 1)

The composition of claim 1 wherein said composition has a cure response MH-ML of at least 2.5 dN-m as determined according to ASTM D5289-07a using test conditions of 0.5° arc and 180° C. for 10 minutes.

### Claim 13 (depends on 1)

A process for making the curable composition of claim 1, said process comprising:
(i) dispersing said polyamide in ethylene copolymer elastomer gum by mixing at a temperature above the melting peak temperature of the polyamide to provide a blend;
(ii) optionally, adding compatibilizer;
(iii) cooling said blend below crystallization peak temperature of said polyamide, such that the blend has a Mooney viscosity (ML 1+4, 125° C.) less than about 200;
(iv) optionally mixing the same or different ethylene copolymer elastomer gum into the blend from (iii) as needed to produce a blend of polyamide and ethylene copolymer comprising about 5 phr of less polyamide; and
(v) adding a curative into the blend comprising about 5 phr or less polyamide at a temperature less than the melting peak temperature of the polyamide.

### Claim 14 (depends on 13)

The process of claim 13, said process further comprising the step of mixing with said blend, at a temperature below the peak melting temperature of the polyamide, with additives, said additives selected from the group consisting of additional fillers, antioxidants, process aids, plasticizers, waxes, release aids, acid scavengers, colorants and property enhancers.

### Claim 15 (depends on 13)

The process of claim 13 wherein said curative is a peroxide curative.

### Claim 16 (depends on 13)

The process of claim 13, said process further comprising forming said curable composition into a desired article and curing said composition.

### Claim 17 (depends on 16)

The process of claim 16 wherein said formed article is selected from the group consisting of wire jacketing, cable jacketing, molded or extruded tubing or hose, or molded boots, belts, grommets, seals and gaskets.