US4670089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bonding polytetrafluoro-ethylene composition to metal substrates
Assignee: Saint Gobain Performance Plastics Corp
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Filing: 1986-02-27
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Granted: 1987-06-02
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Expires: 2006-02-27
Abstract
Abstract A method of bonding a fluoroplastic material to a preselected surface of a metal substrate is disclosed. The method comprises: providing a flexible film, tape or sheet comprised of a fluoroplastic material which expands when heated; etching one side of the fluoroplastic film, tape or sheet; providing a flexible adhesive laminate having a surface layer comprised of a thermosetting adhesive film adhered to a non-adhesive and removable backing; treating the surface layer with a solvent to render it tacky; joining the tacky surface to the etched surface of the fluoroplastic film under pressure to form a laminate; cutting a shape from the laminate which replicates the shape of the preselected surface of the metal substrate; removing the non-adhesive backing from the laminate shape to expose the thermosetting adhesive film layer; covering the preselected surface of the metal substrate with the exposed adhesive film layer of the laminate; restraining the laminate from lateral expansion while heating the laminate to a temperature which thermosets the adhesive film and expands the fluoroplastic, for a time period sufficient to bond the fluoroplastic material to the preselected surface of the metal substrate.
Inventors
- 👤 Michael W. Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:36
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/128; C09; C09J; C09J5/00; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
A method of bonding a fluoroplastic material to a surface of a metal substrate which comprises: providing a flexible film, tape or sheet comprised of a fluoroplastic material; etching one side of the fluoroplastic film, tape or sheet; providing a flexible adhesive laminate having a surface layer comprised of a thermosetting adhesive film adhered to a non-adhesive and removable backing; treating the adhesive film surface layer with a solvent to render it tacky; joining the tacky surface to the etched surface of the fluoroplastic film, tape or sheet under pressure to form a laminate; cutting a shape from the laminate which replicates the shape of the preselected surface of the metal substrate; removing the non-adhesive backing from the laminate shape to expose the thermosetting adhesive film layer; covering the preselected surface of the metal substrate with the exposed adhesive layer of the laminate; restraining the laminate from lateral expansion while heating the laminate to a temperature which thermosets the adhesive film and expands the fluoroplastic for a time period sufficient to bond the fluoroplastic material to the preselected surface of the metal substrate.
Claim 2
Independent Claim
183 words
A method of bonding a fluoroplastic material to a surface of a metal substrate which comprises: providing a flexible film, tape or sheet comprised of a fluoroplastic material; etching one side of the fluoroplastic film, tape or sheet; providing a flexible adhesive laminate having a surface layer comprised of a thermosetting adhesive film adhered to a non-adhesive and removable backing; treating the adhesive film surface layer with a solvent to render it tacky; joining the tacky surface to the etched surface of the fluoroplastic film, tape or sheet under pressure to form a laminate; cutting a shape from the laminate which replicates the shape of the preselected surface of the metal substrate; removing the non-adhesive backing from the laminate shape to expose the thermosetting adhesive film layer; covering the preselected surface of the metal substrate with the exposed adhesive layer of the laminate; restraining the laminate from lateral expansion while heating the laminate to a temperature which thermosets the adhesive film and expands the fluoroplastic for a time period sufficient to bond the fluoroplastic material to the preselected surface of the metal substrate.
Claim 3
Dependent Claim
22 words
The method of claim 1 where said fluoroplastic is selected from the group consisting of polytetrafluoroethylene and polytetrafluoroethylene containing a wear-resistant filler.
Claim 4
Dependent Claim
71 words
The method of claim 1 wherein said fluoroplastic is selected from the group consisting of a perfluoroalkyl resin having the following repeating units: ##STR4## where R is C n F 2n+1 and n is an integer ≧1; a fluorinated ethylene propylene copolymer having the following repeating units: [CF 2 CF 2 ) n CF 2 CF], wherein CF 3 n is an integer ≧1; ethylene-chlorotrifluoroethylene copolymer; ethylene-tetrafluoroethylene copolymer; and polyvinylidene fluoride.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the thermosetting adhesive comprises a thermosetting resin and a curing agent for the resin.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the backing comprises a silicone paper.
Claim 7
Dependent Claim
59 words
The method of claim 1 wherein said adhesive film surface is softened and rendered tacky by exposure to a solvent selected from the group consisting of methyl ethyl ketone, acetone, methyl n-propyl ketone, diethyl ketone, hexanone-2, hexanone-3, methyl t-butyl ketone, di-n-propyl ketone, diisopropyl ketone, diisobutyl ketone, di-n-amyl ketone, stearone, choroacetone, s-dichloroacetone, diacetyl, acetylacetone, mesityl oxide, phorone, cyclohexanone and benzophenone.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein said tacky adhesive surface is joined to the etched surface of the fluoroplastic film under a pressure of about 50 psi.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein said temperature which thermosets the adhesive film and expands the fluoroplastic is above about 190° C.
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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |