Cure system of halogenated elastomer compositions, a curable halogenated elastomer composition, and a method for curing halogenated elastomer compositions

• US 8,252,870 B2
• Filed: 08/21/2007
• Issued: 08/28/2012
• Est. Priority Date: 08/30/2006
• Status: Expired due to Fees

• Current Assignee: Dow Global Technologies LLC (Dow, Inc.)
• Original Assignee: Dow Global Technologies LLC (Dow, Inc.)
• Inventors: Laakso, Raymond L. Jr., Marchand, Gary R.
• Primary Examiner(s): CHEUNG, WILLIAM K
• Application Number:
  US12/438,151
• Publication Number:
  US 20100010152A1
• Time in Patent Office: 1,834 Days
• Field of Search: 525/330.7, 525/334.1, 525/343, 525/346, 525/347, 525/349, 525/350, 525/351, 525/326.3, 525/331.1, 525/327.3, 525/328.5, 525/366, 525/374, 525/375
• US Class Current: 525/330.7
• CPC Class Codes: C08K 2201/014 Additives containing two or more different additives of the same subgroup in C08K
• CPC Class Codes: C08K 3/011 Crosslinking or vulcanising agents, e.g. accelerators
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/16 Nitrogen-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08K 5/548 containing sulfur C08K5/5477 takes precedence
• CPC Class Codes: C08L 11/00 Compositions of homopolymers or copolymers of chloroprene
• CPC Class Codes: C08L 15/02 Rubber derivatives containing halogen
• CPC Class Codes: C08L 23/28 by reaction with halogens or compounds containing halogen C08L23/32 takes precedence
• CPC Class Codes: C08L 57/08 containing halogen atoms

Abstract

The instant invention is a cure system for halogenated elastomer compositions, a curable halogenated elastomer composition, and a method for curing a halogenated elastomer composition. The cure system for halogenated elastomer compositions includes a polymercapto crosslinking agent, an inorganic base, and a combination of at least two or more of (a) a nitrogen containing chelating agent; (b) a first accelerator; or (c) a second accelerator. The curable halogenated elastomer composition includes a chlorinated elastomer, and a cure system including a polymercapto crosslinking agent, an inorganic base, and a combination of at least two or more of (a) a nitrogen containing chelating agent; (b) a first accelerator; or (c) a second accelerator. Furthermore, the method for curing a halogenated elastomer composition includes the following steps: (1) providing a chlorinated elastomer composition; (2) providing a cure system composition including a polymercapto crosslinking agent, an inorganic base, and a combination of at least two or more of (a) a nitrogen containing chelating agent; (b) a first accelerator; or (c) a second accelerator; (3) uniformly blending the cure system into the chlorinated elastomer composition; (4) thereby forming a curable chlorinated elastomer composition; (5) subjecting the curable chlorinated elastomer composition to heat or heat and pressure; and (6) thereby curing the curable chlorinated elastomer composition.

Claims

1. A curable chlorinated elastomer composition comprising:

a chlorinated elastomer; and

a cure system composition comprising;

a polymercapto crosslinking agent;

an inorganic base; and

a combination of;

(a) a nitrogen containing chelating agent, wherein said polymercapto crosslinking agent is a crosslinking agent selected from the group consisting of 2,5-dimercapto-1,3,4-thiadiazole and a derivative thereof;

(b) a first accelerator, said first accelerator is an ammonium or phosphonium salt, wherein said ammonium or phosphonium salt having a formula selected from the group consisting of

2. The curable chlorinated elastomer composition according to claim 1, wherein said cure system further comprising a hydrated salt, said hydrated salt is selected from the group consisting of lithium citrate, trilithium citrate pentahydrate, trilithium citrate tetrahydrate, and monolithium dihydrogen citrate monohydrate.

3. The curable chlorinated elastomer composition according to claim 1, wherein said chlorinated elastomer is a chlorinated olefin elastomer having a heat of fusion <

0.2 calories/gram and having a chlorine content of from 15-48 percent by weight;

said chlorinated olefin elastomer is prepared from an olefin polymer selected from the group consisting of i) polyethylene homopolymers having I₁₀ values of from 0.05-0.8 dg/minute and ii) copolymers of ethylene and up to 25 weight percent of a copolymerizable monomer, said copolymers having I₁₀ values of from 0.05-0.8 dg/minute.

4. The curable chlorinated elastomer composition according to claim 1, wherein said curable chlorinated composition further comprising an additive package comprising at least one ingredient selected from the group consisting of i) fillers;

ii) plasticizers;

iii) process aids;

iv) acid acceptors;

v) antioxidants;

vi) antiozonants; and

vii) combinations thereof .

5. The curable chlorinated elastomer composition 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.

6. The curable chlorinated elastomer composition according to claim 1, wherein said chlorinated elastomer is chlorinated polyethylene.

7. The curable chlorinated elastomer composition according to claim 1, wherein said cure system further comprising a nitrogen containing chelating agent, said agent is soluble in a halogenated elastomer.

8. The curable chlorinated elastomer composition according to claim 1, wherein said nitrogen containing chelating agent is an aromatic heterocyclic base containing a nitrogen bidentate ligand.

9. The curable chlorinated elastomer composition according to claim 1, wherein the nitrogen containing chelating agent is selected from the group consisting of:

1,10-phenanthroline;

2,2-bipyridyl;

a tridentate nitrogen containing compound, selected from the group consisting terpyridine, diethylenetriamine, and derivatives thereof;

a tetradentate nitrogen containing compound, selected from the group consisting of triethylenetetramine, porphyrin, phthalocyanine, and derivatives thereof;

a polyamine selected from the group consisting of an aziridine homopolymer, aziridine/1,2-diaminoethane copolymers, and the polymeric condensation product of ammonia and 1,2-dichloroethane.

10. The curable chlorinated elastomer composition according to claim 1, wherein said first accelerator is selected from the group consisting of tetrapropylammonium bromide, and triethylhexylammonium bromide.

11. The curable chlorinated elastomer composition according to claim 1, wherein said second accelerator is selected from the group consisting of 1-octylpyridinium chloride, 1-octylpyridinium bromide, 1-butyl-3-methylimidazolinium chloride, 1-hexyl-3-methylimidazolinium chloride, and 1-hexyl-2,3-dimethylimidazolinium chloride.

12. An article comprising:

at least one curable chlorinated elastomer composition comprising;

a chlorinated elastomer; and

a cure system composition comprising;

a polymercapto crosslinking agent;

an inorganic base; and

a combination of;

(a) a nitrogen containing chelating agent;

(b) a first accelerator, said first accelerator is an ammonium or phosphonium salt, wherein said ammonium or phosphonium salt having a formula selected from the group consisting of

13. A method of curing a chlorinated elastomer composition comprising the steps of:

providing a chlorinated elastomer composition;

providing a cure system composition comprising;

a polymercapto crosslinking agent;

an inorganic base; and

a combination of;

(a) a nitrogen containing chelating agent;

(b) a first accelerator, said first accelerator is an ammonium or phosphonium salt, wherein said ammonium or phosphonium salt having a formula selected from the group consisting of