US4946883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluororubber compositions exhibiting improved workability and mechanical properties
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1989-12-20
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Granted: 1990-08-07
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Expires: 2009-12-20
Abstract
Abstract Curable fluororubber compositions comprising an organic fluororubber, an organopolysiloxane gum and an epoxy-containing organoalkoxysilane or partial hydrolyzate thereof, a reinforcing filler and an organoperoxide are characterized by excellent roll workability during roll milling and can be cured to yield a fluororubber which undergoes little deterioration in its mechanical properties at low temperatures.
Inventors
- 👤 Kaoru Kunimatsu
- 👤 Atsushi Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08K5/54; C08K5/541; C08K5/5435; C08L; C08L27/00; C08L27/02; C08L27/12; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A curable fluororubber composition comprising (A) 100 parts by weight of a peroxide-curable organic fluororubber, (B) 1 to 60 parts by weight of a peroxide-curable organopolysiloxane gum, (C) 0.1 to 30 parts by weight of an epoxy group-containing organoalkoxysilane or partial hydrolyzate thereof, (D) 1 to 60 parts by weight of a reinforcing filler, and (E) An amount of an organic peroxide sufficient to cure said fluororubber and said gum.
Claim 2
Dependent Claim
70 words
A curable fluororubber composition comprising (A) 100 parts by weight of a peroxide-curable organic fluororubber, (B) 1 to 60 parts by weight of a peroxide-curable organopolysiloxane gum, (C) 0.1 to 30 parts by weight of an epoxy group-containing organoalkoxysilane or partial hydrolyzate thereof, (D) 1 to 60 parts by weight of a reinforcing filler, and (E) An amount of an organic peroxide sufficient to cure said fluororubber and said gum.
Claim 3
Dependent Claim
82 words
A composition according to claim 1 where at least a portion of the silicon atoms of said gum are bonded to 3,3,3-trifluoropropyl radicals, the concentration of said gum is from 1 to 30 parts by weight per 100 parts of said fluororubber, the concentration of said epoxy-substituted alkoxysilane is from 0.5 to 15 parts by weight per 100 parts of said fluororubber, and the concentration of said peroxide is from 0.1 to 10 parts by weight per 100 parts of said fluororubber.
Claim 4
Dependent Claim
41 words
A composition according to claim 1 where the concentration of said epoxy-substituted silane is from 0.3 to 10 parts by weight per 100 parts by weight of said gum and said peroxide is benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, dicumyl peroxide or 2,5-dimethyl-di(t-butylperoxy)hexane.
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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |