# US 7,745,543 B2 · Cure system composition and a method for curing chlorinated elastomer compositions

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- Number: US 7,745,543 B2
- Document ID: US7745543B2
- Status: Granted
- Kind: B2
- Application number: 11/359,307
- Filed: 2006-02-22
- Published: 2006-09-14
- Granted: 2010-06-29
- Earliest claimed: 2005-03-14
- Assignees: Dow Global Technologies LLC
- Inventors: Raymond L. Laakso, Jr.; Gary R. Marchand
- Web page: https://patentgrep.com/patent/US7745543B2

## CPC

- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 3/011: Crosslinking or vulcanising agents, e.g. accelerators
- C08K 5/19: Quaternary ammonium compounds
- C08K 5/3415: Five-membered rings
- C08L 11/00: Compositions of homopolymers or copolymers of chloroprene
- C08L 23/286: Chlorinated polyethylene
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The instant invention is an improved cure system composition and a method for curing chlorinated elastomer compositions. The cure system composition includes a polymercapto crosslinking agent; an inorganic base; and an onium salt. The onium salt has a formula selected from the group consisting of wherein Z is a nitrogen or phosphorous atom, R1 to R4 are independently alkyl or aryl groups containing between 2 and 8 carbon atoms, and the total number of carbon atoms on R1-R4 is between 10 and 14; wherein R5 and R6 are alkyl groups containing between 1 and 8 carbon atoms, and the total number of carbon atoms on R5-R6 being between 5 and 9; and wherein X is an anion. The method for curing a chlorinated elastomer composition according to instant invention includes the following steps: (1) providing a chlorinated elastomer composition; (2) providing a cure system composition as described above; (3) contacting said chlorinated elastomer composition with said cure system composition; and (4) thereby curing said chlorinated elastomer composition.

## Claims

### Claim 1

An article comprising at least one component formed from a cured composition, wherein said cured composition is formed from a curable chlorinated elastomer composition comprising:
a chlorinated elastomer;
a polymercapto crosslinking agent selected from the group consisting of 2,5-dimercapto-1,3,4-thiadiazole, and a derivative thereof;
an inorganic base; and
an onium salt selected from the group consisting of tetrapropylammonium bromide, and triethylhexylammonium bromide.

### Claim 2 (depends on 1)

The article according to claim 1, wherein said chlorinated elastomer is selected from the group consisting of polychloroprene, polyepichlorohydrin, epichlorohydrin/ethylene oxide copolymers, chlorosulfonated polyethylene, chlorinated polyethylene, and chlorinated butyl rubbers.

### Claim 3 (depends on 2)

The article according to claim 2, wherein said chlorinated elastomer is chlorinated polyethylene.

### Claim 4 (depends on 1)

The article according to claim 1, wherein said article is an automotive hose, an industrial hose, a wire and cable jacket, a vibration isolator, a flexible boot for mechanical joint, a roller cover, a seal, or a gasket.