US4914146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluoroethylene containing coating composition
Assignee: Daikin Industries Ltd
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Filing: 1989-07-03
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Granted: 1990-04-03
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Expires: 2009-07-03
Abstract
Abstract A tetrafluoroethylene base polymer-containing coating composition comprising a dispersion of a tetrafluoroethylene base polymer having a molecular weight of at least 5,000,000 in a liquid medium containing a surfactant, which is particularly useful for coating a fixing heater roller and a cooking utensil.
Inventors
- 👤 Norimasa Honda
- 👤 Mutsusuke Namba
- 👤 Yoshiaki Kataoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:50
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; A; A47; A47J; A47J36/00; A47J36/02; C09; C09D; C09D123/00; C09D123/26; C09D123/28; C09D127/00; C09D127/02; C09D127/12; C09D127/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A tetrafluoroethylene base polymer-containing coating composition consisting essentially of a dispersion of a tetrafluoroethylene base polymer having a primary particle size of 0.1 to 0.% μm and having a molecular weight of at least 5,000,000 in a liquid medium containing a surfactant.
Claim 2
Dependent Claim
42 words
A tetrafluoroethylene base polymer-containing coating composition consisting essentially of a dispersion of a tetrafluoroethylene base polymer having a primary particle size of 0.1 to 0.% μm and having a molecular weight of at least 5,000,000 in a liquid medium containing a surfactant.
Claim 3
Dependent Claim
19 words
The coating composition according to claim 1, which further comprises a solid additive for modifying properties of the coating.
Claim 4
Dependent Claim
42 words
The coating composition according to claim 2, wherein the solid additive is at least one selected from the group consisting of mica powder or flakes, a pigment, a heat-resistant polymer, metal powder, a ceramic material, an organic polymer and an antistatic agent.
Claim 5
Dependent Claim
14 words
The coating composition according to claim 3, wherein the solid additive is mica powder.
Claim 6
Dependent Claim
14 words
The coating composition according to claim 1, wherein the tetrafluoroethylene base polymer is polytetrafluoroethylene.
Claim 7
Dependent Claim
22 words
The coating composition according to claims 1 or 5, wherein the tetrafluoroethylene base polymer has a molecular weight of 5,000,000 to 9,000,000.
Claim 8
Dependent Claim
46 words
The coating composition according to claim 1, wherein the tetrafluoroethylene base polymer is a copolymer comprising tetrafluoroethylene and less than 1% by weight of a comonomer selected from the group consisting of hexafluoropropylene, vinyl fluoride, vinylidene fluoride, perfluoroalkyl vinyl ether, chlorotrifluoroethylene, ethylene, propylene and an acrylate.
Claim 9
Dependent Claim
21 words
The coating composition according to claim 7, wherein the comonomer is present in an amount of less than 0.5% by weight.
Claim 10
Dependent Claim
29 words
The coating composition according to claim 1, wherein the tetrafluoroethylene base polymer has been prepared by emulsion polymerization and has a primary particle size of 0.1 to 0.5 μm.
Claim 11
Dependent Claim
42 words
The coating composition according to claim 1, wherein the surfactant is a nonionic surfactant or an anionic surfactant and is present in an amount of from 5 to 10 parts by weight per 100 parts by weight of the tetrafluoroethylene base polymer.
Claim 12
Dependent Claim
17 words
The coating composition according to claim 1, wherein the liquid medium is water or an organic solvent.
Claim 13
Dependent Claim
45 words
A tetrafluoroethylene base polymer-containing coating composition comprising a dispersion of a tetrafluoroethylene base polymer having a molecular weight of at least 5,000,000 in a liquid medium containing a surfactant, wherein said liquid medium is an organic solvent, in which said solvent is toluene or xylene.
Claim 14
Dependent Claim
45 words
A tetrafluoroethylene base polymer-containing coating composition comprising a dispersion of a tetrafluoroethylene base polymer having a molecular weight of at least 5,000,000 in a liquid medium containing a surfactant, wherein said liquid medium is an organic solvent, in which said solvent is toluene or xylene.
References Cited (Backward Citations)
US3935347A
Cited
US4568275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |