Patent US4225482A successfully refreshed from Google Patents.
US4225482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentrated aqueous latex of ethylene/C2 -C3 -perfluorocarbon copolymer or terpolymer
Assignee: Arkema Inc
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Filing: 1978-12-12
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Granted: 1980-09-30
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Expires: 1998-12-12
Abstract
Abstract A process for preparing an aqueous concentrated latex of a copolymer or terpolymer of ethylene and a C 2 -C 3 -perfluorocarbon by creaming a latex of 25-30% copolymer solids and recovering a concentrated latex having 1.5-2.5 times the concentration of the starting latex. The concentrated latex can be used to prepare crack-free or void-free coatings on substrates.
Inventors
- 👤 Richard A. Ferren
- 👤 Daniel A. Dimmig
- 👤 John C. Grigger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:10
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/14; C08F6/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A process for preparing a water-based concentrated latex of a copolymer or terpolymer containing approximately equimolar amounts of ethylene and tetrafluoroethylene and 0-10 mole % hexafluoropropylene which comprises mixing at about 30°-80° C. an aqueous latex containing about 25-30% solids of said copolymer or terpolymer and 6-20% by weight of the latex solids of a surfactant, allowing the mixture to stand quiescent until two layers form, separating off the upper layer and recovering the lower layer as a concentrated latex containing 1.5 to 2.5 times the percent solids content of the starting latex.
Claim 2
Dependent Claim
93 words
A process for preparing a water-based concentrated latex of a copolymer or terpolymer containing approximately equimolar amounts of ethylene and tetrafluoroethylene and 0-10 mole % hexafluoropropylene which comprises mixing at about 30°-80° C. an aqueous latex containing about 25-30% solids of said copolymer or terpolymer and 6-20% by weight of the latex solids of a surfactant, allowing the mixture to stand quiescent until two layers form, separating off the upper layer and recovering the lower layer as a concentrated latex containing 1.5 to 2.5 times the percent solids content of the starting latex.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein said copolymer has a melting point of at least 225° C., a tensile strength of at least 6000 psi and an elongation of not more than 300%.
Claim 4
Dependent Claim
24 words
The process of claim 1 where said surfactant is selected from the group consisting of alkylaryl polyethers and polyols of block copolymers containing polyoxypropylene.
Claim 5
Dependent Claim
25 words
The process of claim 1 where the starting latex has a solids content of 25-30% and the concentrated product has a solids content of 45-60%.
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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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |