US4840994A
Expired / Lapsed
US
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Compositions based on fluoroelastomers and on modified olefinic polymers
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1988-06-17
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Granted: 1989-06-20
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Expires: 2008-06-17
Abstract
Abstract Fluoroelastomer compositions vulcanizable with peroxides having improved processability and compatibility properties and comprising, as additives, ethylene polymers and ethylene-propylene or ethylene-butene copolymers having, along the polymer chain, ester groups of the type--COOR where R is a C 1 -C 8 alkyl, wherein the ester groups amount to 0.5-10% by weight as referred to the total polymer. Such polymer additives contain the ester group bound to a carbon atom of the chain either directly or through a --CH 2 -- or in the form ##STR1## where R is a C 1 -C 8 alkyl group.
Inventors
- 👤 Giovanni Moggi
- 👤 Gianna Cirillo
- 👤 Mauro Aglietto
- 👤 Enzo Benedetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:23
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L23/00; C08L23/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
Fluoroelastomer compositions vulcanizable with peroxide and/or ionic vulcanization, comprising from 0.5 to 5 parts by weight, per 100 parts by weight of fluoroelastomer, of an ethylene homopolymer or of an ethylene/propylene or ethylene/butene-1 copolymer of the amorphous type and containing ester groups --COOR, R=an alkyl with 1 to 8 C, along the polymeric chain, in amounts equal to 0.5%-10% by weight referred to the olefin polymer, said ester groups being bound to carbon atoms of the polymer chain either directly or through a --CH 2 -- radical or in the form ##STR3## where R is a C 1 -C 8 alkyl group.
Claim 2
Dependent Claim
102 words
Fluoroelastomer compositions vulcanizable with peroxide and/or ionic vulcanization, comprising from 0.5 to 5 parts by weight, per 100 parts by weight of fluoroelastomer, of an ethylene homopolymer or of an ethylene/propylene or ethylene/butene-1 copolymer of the amorphous type and containing ester groups --COOR, R=an alkyl with 1 to 8 C, along the polymeric chain, in amounts equal to 0.5%-10% by weight referred to the olefin polymer, said ester groups being bound to carbon atoms of the polymer chain either directly or through a --CH 2 -- radical or in the form ##STR3## where R is a C 1 -C 8 alkyl group.
Claim 3
Dependent Claim
62 words
Fluoroelastomer compositions according to claim 1, wherein the fluoroelastomer is selected from the class consisting of: (a) copolymers of CH 2 ═CF 2 with perfluoropropene; (b) copolymers of CH 2 ═CF 2 with CF 2 ═CFCl; (c) fluorosilicone rubbers containing cure site peroxides; (d) copolymers of CF 2 ═CF 2 with perfluoroalkylvinylethers; and (e) copolymers of CF 2 ═CF 2 with propylene.
Claim 4
Dependent Claim
26 words
Fluoroelastomer compositions according to claim 2, wherein under (a) there may also be present tetrafluoroethylene and co-monomers acting as a cure site for the peroxide vulcanization.
Claim 5
Dependent Claim
34 words
Fluoroelastomer compositions according to claim 1, wherein the fluoroelastomer is present in admixture with a lesser amount of ethylene/propylene elastomer copolymer, equal to 5-50 parts by weight per 100 parts by weight of fluoroelastomer.
Claim 6
Dependent Claim
16 words
Fluoroelastomer compositions according to claim 1, wherein the fluoroelastomer is of the type vulcanizable with peroxides.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |