US5340843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluororesin foam
Assignee: Junkosha Co Ltd
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Filing: 1993-02-22
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Granted: 1994-08-23
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Expires: 2013-02-22
Abstract
Abstract Perfluorotripentylamine, perfluoropolyether or another such high-boiling liquid is added as a foaming agent to a thermoplastic fluororesin such as a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin or a tetrafluoroethylene-hexafluoropropylene copolymer resin. Because the vapor pressure of said foaming agent in the molten fluororesin is lower than that of Freon or another such low-boiling foaming agent, the cells in the foam can be made fine and uniform in diameter.
Inventors
- 👤 Makoto Tsuruta
- 👤 Ken Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J2203/00; C08J2203/14; C08J2203/146; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; C08J2471/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
A close-cell foam of a thermoplastic fluoropolymer prepared from a thermoplastic fluoro polymer resin and a foaming agent is selected from the class consisting of perfluorotripenylamine and perfluoropolyether in which the melting point of the resin is higher than the boiling point of the foaming agent and the two are within 150° C. of each other.
Claim 2
Dependent Claim
56 words
A close-cell foam of a thermoplastic fluoropolymer prepared from a thermoplastic fluoro polymer resin and a foaming agent is selected from the class consisting of perfluorotripenylamine and perfluoropolyether in which the melting point of the resin is higher than the boiling point of the foaming agent and the two are within 150° C. of each other.
Claim 3
Dependent Claim
20 words
The foam of claim 1 in which the fluoropolymer is selected from the class consisting of thermoplastic copolymers of tetrafluoroethylene.
Claim 4
Dependent Claim
32 words
The foam of claim 2 in which the thermoplastic copolymers are selected from the class consisting of tetrafluoroethylene and perfluoroalkyl vinyl ether, tetrafluoroethylene and a copolymer of hexafluoropropylene, and tetrafluoroethylene and ethylene.
Claim 5
Dependent Claim
57 words
Process of foaming a thermoplastic fluoropolymer which comprises preparing a mixture of a thermoplastic fluoropolymer and a foaming agent is selected from the class consisting of perfluorotripenylamine and perfluoropolyether wherein the melting point of the fluoropolymer and the boiling point of the foaming agent are within 150° C. of each other, extruding the mixture through a die.
Claim 6
Dependent Claim
57 words
Process of foaming a thermoplastic fluoropolymer which comprises preparing a mixture of a thermoplastic fluoropolymer and a foaming agent is selected from the class consisting of perfluorotripenylamine and perfluoropolyether wherein the melting point of the fluoropolymer and the boiling point of the foaming agent are within 150° C. of each other, extruding the mixture through a die.
References Cited (Backward Citations)
US5162384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |