US5051480A
Expired / Lapsed
US
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Elastomeric blends
Assignee: Flexsys America LP
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Filing: 1989-10-16
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Granted: 1991-09-24
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Expires: 2009-10-16
Abstract
Abstract Compositions of acrylic rubber and another rubber which can be nitrile rubber, hydrogenated nitrile rubber, fluoroelastomer, silicon rubber, or fluorosilicone rubber are described, in which the acrylic rubber can be uncured or at least partially crosslinked. The compositions are millable and processable and, by the addition of curatives for the nitrile rubber, hydroganted nitrile rubber, fluoroelastomer, siloicone rubber, or fluorosilicone rubber, can be further crosslinked to become vulcanizates which exhibit excellent resistance to the effects of hot air, hot oil, and ozone. The acrylic rubber is a copolymers from alkyl acrylate monomer which copolymer contains no crosslinking sites other than acrylate ester sites, and can be crosslinked by reaction with a paraffinic alcohol.
Inventors
- 👤 Aubert Y. Coran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:39
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/02; C08L15/00; C08L15/005; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08L21/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
52 words
An elastomeric blend comprising 10-90 parts by weight of (A) an elastomeric polymer from one or more alkyl acrylate monomers which polymer contains no crosslinking sites other than acrylate ester sites and, correspondingly, 90-10 parts by weight of (B) another elastomeric polymer which is nitrile rubber, hydrogenated nitrile rubber, or a fluoroelastomer.
Claim 2
Dependent Claim
52 words
An elastomeric blend comprising 10-90 parts by weight of (A) an elastomeric polymer from one or more alkyl acrylate monomers which polymer contains no crosslinking sites other than acrylate ester sites and, correspondingly, 90-10 parts by weight of (B) another elastomeric polymer which is nitrile rubber, hydrogenated nitrile rubber, or a fluoroelastomer.
Claim 3
Dependent Claim
32 words
The blend of claim 1, comprising 20-60 parts of (A) and, correspondingly, 80-40 parts of (B), wherein the alkyl acrylate monomers are ethyl acrylate or mixtures comprising ethyl acrylate and butyl acrylate.
Claim 4
Dependent Claim
16 words
The blend of claim 2 comprising 25-50 parts of (A) and, correspondingly, 75-50 parts of (B).
Claim 5
Dependent Claim
9 words
The blend of claim 3 containing curatives for (B).
Claim 6
Dependent Claim
10 words
The blend of claim 4 in which (B) is vulcanized.
Claim 7
Dependent Claim
23 words
The blend of claim 1 in which (A) is in the form of vulcanized or crosslinked particles of average diameter below 50 micrometers.
Claim 8
Dependent Claim
33 words
The blend of claim 6 comprising 25-65 parts by weight of (A) and, correspondingly, 75-35 parts by weight of (B), in which the particles of (A) have an average diameter below 20 micrometers.
Claim 9
Dependent Claim
33 words
The blend of claim 7 comprising 40-60 parts by weight of (A) and, correspondingly, 60-40 parts by weight of (B), in which the particles of (A) have an average diameter below 10 micrometers.
Claim 10
Dependent Claim
17 words
The blend of claim 7 in which (B) is nitrile rubber, hydrogenated nitrile rubber or a fluoroelastomer.
Claim 11
Dependent Claim
18 words
The blend of claim 9 in which the particles of (A) have an average diameter below 5 microns.
Claim 12
Dependent Claim
15 words
The blend of claim 6 in which (B) is nitrile rubber or hydrogenated nitrile rubber.
Claim 13
Independent Claim
101 words
A method for preparing a millable, vulcanizable elastomeric composition by the steps of: i) forming a mixture comprising 10-90 parts by weight of (A) one or more elastomeric polymers from alkyl acrylate monomer which polymers contain no crosslinking sites other than acrylate ester sites, and, correspondingly,90-10 parts by weight of (B) another elastomeric polymer which is nitrile rubber, hydrogenated nitrile rubber, a fluoroelastomer, a silicone rubber or a fluorosilicone rubber and, ii) masticating the mixture at a temperature between 140° and 240° C. in the presence of a diol for a time sufficient to achieve at least partial vulcanization of (A).
Claim 14
Independent Claim
101 words
A method for preparing a millable, vulcanizable elastomeric composition by the steps of: i) forming a mixture comprising 10-90 parts by weight of (A) one or more elastomeric polymers from alkyl acrylate monomer which polymers contain no crosslinking sites other than acrylate ester sites, and, correspondingly,90-10 parts by weight of (B) another elastomeric polymer which is nitrile rubber, hydrogenated nitrile rubber, a fluoroelastomer, a silicone rubber or a fluorosilicone rubber and, ii) masticating the mixture at a temperature between 140° and 240° C. in the presence of a diol for a time sufficient to achieve at least partial vulcanization of (A).
Claim 15
Dependent Claim
14 words
The method of claim 12 wherein a transesterification catalyst is present with the diol.
Claim 16
Dependent Claim
14 words
The method of claim 13 wherein the diol contains 2 to 12 carbon atoms.
Claim 17
Dependent Claim
12 words
The method of claim 14 wherein the catalyst is a metal salt.
Claim 18
Dependent Claim
21 words
The method of claim 15 wherein the diol is 1,6-hexanediol and the catalyst is selected from dibutyltin dilaurate and dibutyltin diacetate.
Claim 19
Dependent Claim
11 words
The method of claim 14 wherein the catalyst is poly(dioctyltin maleate).
Claim 20
Dependent Claim
16 words
The method of claim 14 wherein (B) is nitrile rubber, hydrogenated nitrile rubber or a fluoroelastomer.
Claim 21
Dependent Claim
8 words
The product of the method of claim 12.
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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) | 1994-09-23 | 1995-03-25 | 1995-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-23 | 1999-03-25 | 1999-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-23 | 2003-03-25 | 2003-09-24 | $7700.00 | Window Closed / Lapsed |