Patent US3787281A successfully refreshed from Google Patents.
US3787281A
Expired / Lapsed
US
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Forming a hydrolytically stable bond between glass and polytetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1968-10-29
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Granted: 1974-01-22
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Expires: 1988-10-29
Abstract
Abstract Polytetrafluoroethylene is contacted with glass fiber coated with either an amino-functional, water-hydrolyzable organo silane or methacrylato chromic chloride and sintered under an inert atmosphere to obtain bonding between the glass and the polytetrafluoroethylene.
Inventors
- 👤 J Effenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:21
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08J5/08; C08K; C08K9/00; C08K9/04; C08K9/06; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2962; Y10T428/2964; Y10T428/2965; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
35 words
The process of claim 1 wherein said glass is in the form of glass fibers and the bringing into contact step is carried out by blending the coated fibers with the polytetrafluoroethylene in particulate form.
Claim 2
Dependent Claim
18 words
The process of claim 1 wherein the sintering is done at a temperature of from 350 to 390*C.
Claim 3
Dependent Claim
61 words
A hydrolytically stable composite structure blend comprising polytetrafluoroethylene bonded to glass fiber through a monomeric water-hydrolyzable amino-functional silane or methacrylato chromic chloride coupling agent, said glass fiber providing reinforcement of said polytetrafluoroethylene, said glass fiber comprising from 10 to 40 percent by weight of said blend, said blend having a tensile strength of at least 2,000 psi. at 30 percent elongation.
Claim 4
Dependent Claim
35 words
The blend of claim 4 wherein the coupling agent is omega-aminoalkyltrialkoxy silane wherein the alkyl group contains from three to nine carbon atoms and the alkoxy groups contain from one to five carbon atoms each.
Claim 5
Dependent Claim
18 words
The blend of claim 4 wherein the amino function of said coupling agent is provided by the group
Claim 6
Dependent Claim
14 words
The blend of claim 4 wherein said coupling agent is monomeric water-hydrolyzable amino-functional silane.
Claim 7
Dependent Claim
13 words
The blend of claim 4 wherein said coupling agent is methacrylato chromic chloride.
Claim 8
Dependent Claim
60 words
A reinforceable composition of polytetrafluoroethylene and glass in which the glass is capable of providing hydrolytically stable reinforcement of said polytetrafluoroethylene, said composition consisting essentially of said polytetrafluoroethylene blended with from 5 to 50 percent by weight of said glass in the particulate form, said glass having a coating of monomeric water-hydrolyzable amino-functional silane or methacrylato chromic chloride coupling agent.
Claim 9
Dependent Claim
20 words
The composition of claim 9 wherein the glass is glass fibers and the coupling agent is monomeric water-hydrolyzable amino-functional silane.
Claim 10
Dependent Claim
19 words
The composition of claim 9 wherein the glass Is glass fibers and the coupling agent is methacrylato chromic chloride.
Claim 11
Dependent Claim
30 words
A hydrolytically stable blend comprising polytetrafluoroethylene bonded to glass fiber through a monomeric water-hydrolyzable amino-functional silane, said glass fiber comprising from 10 to 40 percent by weight of said blend.
Claim 12
Dependent Claim
36 words
A product comprising a durable silicate glass and a polytetrafluoroethylene resin bonded to the surface of the glass by means of an intermediate amino-functional silane coupling agent, the amino group being a primary or secondary amine.
Claim 13
Dependent Claim
12 words
The product of claim 13 wherein said polytetrafluoroethylene resin is tetrafluoroethylene polymer.
Claim 14
Dependent Claim
11 words
The product of claim 13 wherein said glass is borosilicate glass.
Claim 15
Dependent Claim
12 words
The product of claim 15 wherein said amino-functional coupling agent is N-beta-aminoethyl-gamma-aminopropyl-trimethoxysilane.
Claim 16
Dependent Claim
12 words
The product of claim 15 wherein said amino-functional coupling agent is N-beta-aminoethyl-(alpha-methyl-gamma-aminopropyl)-dimethoxymethylsilane.
Claim 17
Dependent Claim
13 words
The product of claim 15 wherein said amino functional coupling agent is gamma-aminopropyl-triethoxysilane.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |