US4501858A
Expired / Lapsed
US
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Accelerators for vulcanizing vinylidene fluoride elastomeric copolymers
Assignee: Montedison SpA
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Filing: 1984-03-21
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Granted: 1985-02-26
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Expires: 2004-03-21
Abstract
Abstract Vulcanization of fluoroelastomers based on vinylidene fluoride by means of a polyhydroxyl aromatic compound, a divalent metal compound of basic nature and an accelerator consisting of a salt of bis(triarylphosphin)-imidinium of general formula: [Ar3P=N=P Ar3]n+.Xn- wherein: n=1 or 2 Ar=an aryl group X=a mono- or divalent anion.
Inventors
- 👤 Giovanni Moggi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:22
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/5399
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A vulcanizable fluoroelastomeric composition, comprising: (A) a copolymer of elastomeric nature based on vinylidene fluoride and of at least another fluorinated monomer, (B) a substance having the property of neutralizing acids, selected from amongst the oxides of divalent metals, the hydroxides of divalent metals and mixtures of such oxides and hydroxides with metal salts of weak acids, (C) a polyhydroxyl aromatic compound suited to act as a vulcanizing agent for the copolymer, and characterized in that it contains, as a vulcanization accelerator, a compound having the structure of bis(triarylphosphin)-iminium salt of general formula: ##STR3## wherein Ar is an aryl radical, n=1 or 2, X is a monovalent or divalent anion.
Claim 2
Dependent Claim
110 words
A vulcanizable fluoroelastomeric composition, comprising: (A) a copolymer of elastomeric nature based on vinylidene fluoride and of at least another fluorinated monomer, (B) a substance having the property of neutralizing acids, selected from amongst the oxides of divalent metals, the hydroxides of divalent metals and mixtures of such oxides and hydroxides with metal salts of weak acids, (C) a polyhydroxyl aromatic compound suited to act as a vulcanizing agent for the copolymer, and characterized in that it contains, as a vulcanization accelerator, a compound having the structure of bis(triarylphosphin)-iminium salt of general formula: ##STR3## wherein Ar is an aryl radical, n=1 or 2, X is a monovalent or divalent anion.
Claim 3
Dependent Claim
13 words
The vulcanizable fluoroelastomeric composition according to claim 1, in which X is tetrafluoroborate.
Claim 4
Dependent Claim
13 words
The vulcanizable fluoroelastomeric composition according to claim 1, in which X is tetraphenylborate.
Claim 5
Dependent Claim
13 words
Manufactured articles comprising vulcanized fluoroelastomers obtained starting from the compositions of claim 1.
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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |