US4546144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions of tetrafluoroethylene aqueous dispersions
Assignee: EIDP Inc
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Filing: 1984-01-09
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Granted: 1985-10-08
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Expires: 2004-01-09
Abstract
Abstract It has been discovered that if a selected water-soluble aluminum, magnesium or zinc salt of a monovalent anion is added to an aqueous dispersion of a non-melt-fabricable tetrafluoroethylene polymer wherein the dispersion has a pH of 4 or less, the resulting dispersion will flow well on a woven fabric substrate, such as a woven glass fiber fabric, and will fill and cover the interstices of the weave without the necessity of having filler particles present.
Inventors
- 👤 Alan C. Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:28
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; D; D06; D06N; D06N3/00; D06N3/04; D06N3/047; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
An aqueous dispersion consisting essentially of (a) water (b) non-melt-fabricable tetrafluoroethylene polymer dispersed in the water, present in an amount of between 20 and 70% based on total dispersion weight, (c) 4.0 to 9.0% based on weight of tetrafluoroethylene polymer, of a nonionic surfactant, (d) 0.2 to 2.0 moles per kg of tetrafluoroethylene polymer, of at least one water-soluble salt in which the cation is selected from Al+++, Mg++ and Zn++ and the anion is a monovalent inorganic anion or an organic carboxylate anion or dianion; and (e) sufficient inorganic acid or carboxyl-containing organic acid to cause the pH of the dispersion to be equal to 4 or less.
Claim 2
Dependent Claim
109 words
An aqueous dispersion consisting essentially of (a) water (b) non-melt-fabricable tetrafluoroethylene polymer dispersed in the water, present in an amount of between 20 and 70% based on total dispersion weight, (c) 4.0 to 9.0% based on weight of tetrafluoroethylene polymer, of a nonionic surfactant, (d) 0.2 to 2.0 moles per kg of tetrafluoroethylene polymer, of at least one water-soluble salt in which the cation is selected from Al+++, Mg++ and Zn++ and the anion is a monovalent inorganic anion or an organic carboxylate anion or dianion; and (e) sufficient inorganic acid or carboxyl-containing organic acid to cause the pH of the dispersion to be equal to 4 or less.
Claim 3
Dependent Claim
12 words
The use of the dispersion of claim 1 to coat woven fabric.
Claim 4
Dependent Claim
9 words
Glass fabric coated with the dispersion 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) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |