Patent US4725637A successfully refreshed from Google Patents.
US4725637A
Expired / Lapsed
US
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Process for the production of a thermoplastic elastomer composition
Assignee: BP Chemicals Ltd
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Filing: 1986-04-18
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Granted: 1988-02-16
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Expires: 2006-04-18
Abstract
Abstract A process for producing a thermoplastic elastomer comprising dynamically curing with a peroxy curing agent (A) nitrile rubber and (B) homopolymer or copolymer of ethylene, which is curable with the peroxy curing agent but excluding copolymers comprising ethylene and an acrylic or methacrylic ester. The thermoplastic elastomer composition produced by the process is suitable for use in sealant or adhesive compositions, particularly when blended with a tackifying resin.
Inventors
- 👤 Alan Fernyhough
- 👤 Sidney G. Fogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:07
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/02; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/0869; C08L31/00; C08L31/02; C08L31/04; C08L33/00; C08L33/18; C08L33/20; C08L2205/00; C08L2205/03; C08L2205/035; C08L2312/00; C08L33/24; C08L33/26; C08L91/00; C08L91/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
140 words
A process for producing a composition suitable for use as a sealant or adhesive which process comprises curing under dynamic curing conditions a blend comprising: (A) a first nitrile rubber which is liquid at 20° C., (B) a second nitrile rubber which is solid at 20° C., (C) a copolymer of ethylene selected from the group consisting of ethylene-vinyl acetate copolymer, hydrolysed or partially hydrolysed ethylene-vinyl acetate copolymer, ethylene-vinyl ether copolymer, ethylene-acrylic acid copolymer and mixtures thereof, and (D) a peroxy curing agent, the dynamic curing of the nitrile rubbers and the copolymer of ethylene being carried out by mixing the components (A) to (D) at a temperature above the activation temperature of the peroxy curing agent and above the melting temperature of the copolymer of ethylene to produce a thermoplastic elastomer which is then blended with a tackifying resin.
Claim 2
Dependent Claim
140 words
A process for producing a composition suitable for use as a sealant or adhesive which process comprises curing under dynamic curing conditions a blend comprising: (A) a first nitrile rubber which is liquid at 20° C., (B) a second nitrile rubber which is solid at 20° C., (C) a copolymer of ethylene selected from the group consisting of ethylene-vinyl acetate copolymer, hydrolysed or partially hydrolysed ethylene-vinyl acetate copolymer, ethylene-vinyl ether copolymer, ethylene-acrylic acid copolymer and mixtures thereof, and (D) a peroxy curing agent, the dynamic curing of the nitrile rubbers and the copolymer of ethylene being carried out by mixing the components (A) to (D) at a temperature above the activation temperature of the peroxy curing agent and above the melting temperature of the copolymer of ethylene to produce a thermoplastic elastomer which is then blended with a tackifying resin.
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1 in which the nitrile rubbers are butadiene-acrylonitrile rubbers having an acrylonitrile content of from 20-45% by weight.
Claim 4
Dependent Claim
37 words
A process as claimed in claim 1 in which the copolymer of ethylene is an ethylene-vinyl acetate copolymer having from 15-80% by weight of vinyl acetate and a melt flow index of from 2 to 600 dg/min.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 3 in which the ratio of nitrile rubber to ethylene-vinyl acetate copolymer is from 1:5 to 4:1 parts by weight.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 4 in which the ratio of nitrile rubbers to ethylene-vinyl acetate copolymer is from 1:2 to 2:1 parts by weight.
Claim 7
Dependent Claim
49 words
A process as claimed in claim 1 in which the tackifying resin comprises 5 to 100 parts by weight per hundred parts of the total weight of the nitrile rubbers and the copolymer of ethylene and is selected from the group consisting of hydrogenated rosins and hydrogenated rosin esters.
Claim 8
Dependent Claim
20 words
A process as claimed in claim 11 in which a wax is blended with the thermoplastic elastomer and tackifying resin.
Claim 9
Dependent Claim
73 words
A sealant or adhesive composition comprising a tackifying resin and a dynamically cured blend comprising: (A) a first nitrile rubber which is liquid at 20° C., (B) a second nitrile rubber which is solid at 20° C., (C) a copolymer of ethylene selected from the group consisting of ethylene-vinyl acetate copolymer, hydrolysed or partially hydrolysed ethylene-vinyl acetate copolymer, ethylene-vinyl ether copolymer, ethylene-acrylic acid copolymer and mixtures thereof, and (D) a peroxy curing agent.
Claim 10
Dependent Claim
73 words
A sealant or adhesive composition comprising a tackifying resin and a dynamically cured blend comprising: (A) a first nitrile rubber which is liquid at 20° C., (B) a second nitrile rubber which is solid at 20° C., (C) a copolymer of ethylene selected from the group consisting of ethylene-vinyl acetate copolymer, hydrolysed or partially hydrolysed ethylene-vinyl acetate copolymer, ethylene-vinyl ether copolymer, ethylene-acrylic acid copolymer and mixtures thereof, and (D) a peroxy curing agent.
Claim 11
Dependent Claim
26 words
A sealant or adhesive composition as claimed in claim 8 in which the rubbers are butadiene-acrylonitrile rubbers having an acrylonitrile content of from 20-45% by weight.
Claim 12
Dependent Claim
39 words
A sealant or adhesive composition as claimed in claim 8 in which the copolymer of ethylene is an ethylenevinyl acetate copolymer having from 15-80% by weight of vinyl acetate and a melt flow index of 2 to 600 dg/min.
Claim 13
Dependent Claim
29 words
A sealant or adhesive composition as claimed in claim 8 in which the ratio of nitrile rubbers to ethylene-vinyl acetate copolymer is from 1:5 to 4:1 parts by weight.
Claim 14
Dependent Claim
29 words
A sealant or adhesive composition as claimed in claim 8 in which the ratio of nitrile rubbers to ethylene-vinyl acetate copolymer is from 1:2 to 2:1 parts by weight.
Claim 15
Dependent Claim
52 words
A sealant or adhesive composition as claimed in claim 8 in which the tackifying resin comprises 5 to 100 parts by weight per hundred parts of the total weight of the nitrile rubbers and the copolymer of ethylene and is selected from the group consisting of hydrogenated rosins and hydrogenated rosins esters.
Claim 16
Dependent Claim
15 words
A sealant or adhesive composition as claimed in claim 8 which also contains a wax.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |