US3900684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a fluorocarbon polymer containing coating on a substrate
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1973-06-04
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Granted: 1975-08-19
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Expires: 1993-06-04
Abstract
Abstract Aluminum hydroxychloride is added as an adhesive to fluorocarbon polymer dispersions to form coating compositions useful e.g. for the manufacture of non-stick aluminum cookware.
Inventors
- 👤 John Wilmar Edwards
- 👤 Barry William Farrant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/16; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A METHOD OF FORMING A FLUOROCARBON POLYMER-CONTAINING COATING ON A SUBSTRATE COMPRISING APPLYING TO A SUBSTRATE, AN AQUEOUS COMPOSITION HAVING A POLYTETRAFLUOROETHYLENE POLYMER OR COPOLYMER DISPERSED THEREIN AND A ALUMINUM HYDROXYCHLORIDE AS AN ADHESIVE DISSOLVED THEREIN, AND HEATING THE COMPOSITION ON THE SUBSTRATE SUFFICIENTLY TO REMOVE VOLATILE COMPONENTS THEREFROM AND TO FORM A LAYER ON THE SUBSTRATE THE WEIGHT OF THE POLYMER OR COPOLYMER HAVING FROM 10 TO 50 GRAMS PER 100 GRAMS OF COMPOSITION AND WEIGHT OF ALUMINUM PROVIDED BY THE ALUMINUM HYDROXYCHLORIDE BEING AT LEAST 3 GRAMS PER 100 GRAMS OF THE POLYMER OR COPOLYMER.
Claim 2
Independent Claim
97 words
A METHOD OF FORMING A FLUOROCARBON POLYMER-CONTAINING COATING ON A SUBSTRATE COMPRISING APPLYING TO A SUBSTRATE, AN AQUEOUS COMPOSITION HAVING A POLYTETRAFLUOROETHYLENE POLYMER OR COPOLYMER DISPERSED THEREIN AND A ALUMINUM HYDROXYCHLORIDE AS AN ADHESIVE DISSOLVED THEREIN, AND HEATING THE COMPOSITION ON THE SUBSTRATE SUFFICIENTLY TO REMOVE VOLATILE COMPONENTS THEREFROM AND TO FORM A LAYER ON THE SUBSTRATE THE WEIGHT OF THE POLYMER OR COPOLYMER HAVING FROM 10 TO 50 GRAMS PER 100 GRAMS OF COMPOSITION AND WEIGHT OF ALUMINUM PROVIDED BY THE ALUMINUM HYDROXYCHLORIDE BEING AT LEAST 3 GRAMS PER 100 GRAMS OF THE POLYMER OR COPOLYMER.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein the weight of aluminum provided by the aluminum hydroxychloride is from 1 to 5 grams per 100 grams of composition.
Claim 4
Dependent Claim
69 words
A method according to claim 1 wherein the composition is applied to the substrate to form a layer constituting a primer coat, the layer is heated to dry it and to remove substantially all the volatile components of the layer, and further applying to the primer coat a top coat of an aqueous polytetrafluoroethylene polymer or copolymer dispersion, not including an adhesive and sintering the primer and top coats.
Claim 5
Dependent Claim
9 words
Cookware coated by a method according to claim 3.
Claim 6
Dependent Claim
25 words
A method according to claim 1 wherein the copolymer is a copolymer of tetrafluoroethylene with up to 15% by weight of other ethylenically unsaturated monomers.
Claim 7
Dependent Claim
23 words
A method according to claim 5 wherein the other unsaturated monomers as selected from the group consisting of ethylene, vinyl chloride and hexafluoropropane.
Claim 8
Dependent Claim
10 words
An article coated by a method according to claim 1.
Claim 9
Dependent Claim
19 words
A method according to claim 1 wherein the aluminum hydroxychloride has the formula Al2(OH)5Cl.xH2O where x is approximately 2.
Claim 10
Dependent Claim
25 words
A method according to claim 1 wherein the polymer is polytetrafluoroethylene or a copolymer of tetrafluoroethylene with up to 5% by weight of another monomeR.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |