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US4925892A
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Fluoroelastomer compositions containing a tetraalkylammonium halide and vulcanization accelerator
Assignee: EIDP Inc
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Filing: 1989-06-19
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Granted: 1990-05-15
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Expires: 2009-06-19
Abstract
Abstract A fluoroelastomer composition that has enhanced adhesion to metal when cured which comprises: (a) an elastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer, (b) a vulcanization accelerator that is a quaternary phosphonium compound, (c) a crosslinking agent selected from the group consisting of a bisphenol or a polyhydroxy phenol of the formula: ##STR1## where R is H or an alkyl group or an aryl group and R' is an alkyl group or an aryl group, and (d) 0.02-0.8 weight percent based on the weight of the elastomeric copolymer of a metal adhesion promoter that is a tetraalkylammonium halide where each alkyl group contains 1-10 carbon atoms and the halide is a chloride, bromide or iodide. When cured in contact with metal the fluoroelastomer composition forms a strong bond with the metal surface.
Inventors
- 👤 David L. Tabb
- 👤 Janet M. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/19; C08K5/04; C08K5/13; C08K5/132; C08K5/49; C08K5/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
A process for making a curable fluoroelastomer composition that has enhanced adhesion to metal when cured which comprises: mixing an elastomeric copolymer of vinylide fluoride and at least one other fluorinated monomer with a vulcanization accelerator that is a quaternary phosphonium compound, a crosslinking agent selected from the group consisting of a bisphenol and a polyhydroxy phenol of the formula ##STR7## where R is H or an alkyl group or an aryl group, and R' is an alkyl group or an aryl group, and adding 0.02-0.8 weight percent based on the weight of the elastomeric copolymer of vinylidene fluoride of a metal adhesion promoter that is a tetraalkylammonium halide wherein each alkyl group contains 1-10 carbon atoms and the halide is a chloride, bromide or iodide.
Claim 2
Dependent Claim
126 words
A process for making a curable fluoroelastomer composition that has enhanced adhesion to metal when cured which comprises: mixing an elastomeric copolymer of vinylide fluoride and at least one other fluorinated monomer with a vulcanization accelerator that is a quaternary phosphonium compound, a crosslinking agent selected from the group consisting of a bisphenol and a polyhydroxy phenol of the formula ##STR7## where R is H or an alkyl group or an aryl group, and R' is an alkyl group or an aryl group, and adding 0.02-0.8 weight percent based on the weight of the elastomeric copolymer of vinylidene fluoride of a metal adhesion promoter that is a tetraalkylammonium halide wherein each alkyl group contains 1-10 carbon atoms and the halide is a chloride, bromide or iodide.
Claim 3
Dependent Claim
12 words
A process of claim 1 wherein the tetraalkylammonium halide is tetrabutylammonium iodide.
Claim 4
Dependent Claim
12 words
A process of claim 1 wherein the tetraalkylammonium halide is tetrabutylammonium bromide.
Claim 5
Dependent Claim
12 words
A process of claim 1 wherein the tetraalkylammonium halide is tetrabutylammonium chloride.
Claim 6
Dependent Claim
18 words
A process of claim 1 wherein the amount of tetraalkylammonium halide added is from 0.05 -0.2 weight percent.
Claim 7
Dependent Claim
12 words
A process of claim 1 wherein the crosslinking agent is 4,4'-hexafluoroisopropylidene diphenol.
Claim 8
Dependent Claim
14 words
A process of claim 1 wherein the quaternary phosphonium vulcanization accelerator is benzyltriphenylphosphonium chloride.
Claim 9
Dependent Claim
19 words
A process of claim 1 wherein the quaternary phosphonium vulcanization accelerator is a 1:1 phosphonium salt of a bisphenol
Claim 10
Dependent Claim
21 words
A process of claim 6 wherein the quaternary phosphonium vulcanization accelerator is a 1:1 salt of benzyltriphenolphosphonium chloride and 4,4'-hexafluoroisopropylidene diphenol.
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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |