Patent US5397831A successfully refreshed from Google Patents.
US5397831A
Expired / Lapsed
US
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Tetrafluoroethylene copolymer resin powder composition and process for manufacture thereof
Assignee: Chemours Mitsui Fluoroproducts Co Ltd
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Filing: 1993-06-01
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Granted: 1995-03-14
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Expires: 2013-06-01
Abstract
Abstract This invention provides a tetrafluoroethylene (TFE) copolymer resin powder composition capable, upon rotational lining, of generating a corrosion-resistant, nonstick film, which is a thick film on a metal or a like substrate, essentially free of gas bubbles, and excellent in adhesion and peel resistance. The TFE-copolymer resin powder composition comprises granules which comprise particles of a TFE/perfluoro(alkyl vinyl ether) copolymer (PFA), polyphenylene sulfide (PPS) particles having an average particle size of 0.3-50 μm, and a heat resistant filler. This invention also provides a process for manufacturing the TFE copolymer resin powder composition comprising either (1) granulating a mixture of PFA particles, PPS and a heat resistant filler in the presence of water and an organic liquid, or (2) mixing PFA, PPS, and a heat-resistant filler, compression-molding, and pulverizing.
Inventors
- 👤 Takumi Saito
- 👤 Kasuke Ishii
- 👤 Takao Nishio
- 👤 Susumu Nakamura
- 👤 Matunori Takada
- 👤 Kazuhiro Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:24
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08J; C08J3/00; C08J3/12; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A rotational lining which is smooth, non-peeling from the surface on which it is made and being essentially bubble-free, said lining being made from a resin powder composition, comprising granules which consist essentially of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer particles, 0.05-5% by weight of polyphenylene sulfide particles having an average particle size of 0.3-50 μm, and a heat resistant filler, wherein said granules have an average size of 70-1,000 μm, and said composition has a porosity of not more than 0.74, a specific shrinkage of not more than 5.1%, and a melt flow rate that satisfies the following equation: log ƒ≧-0.70 log η+2.83, where ƒ is the melt flow rate of the resin powder composition, and n is the specific melt viscosity at 372° C. of the tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
Claim 2
Dependent Claim
130 words
A rotational lining which is smooth, non-peeling from the surface on which it is made and being essentially bubble-free, said lining being made from a resin powder composition, comprising granules which consist essentially of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer particles, 0.05-5% by weight of polyphenylene sulfide particles having an average particle size of 0.3-50 μm, and a heat resistant filler, wherein said granules have an average size of 70-1,000 μm, and said composition has a porosity of not more than 0.74, a specific shrinkage of not more than 5.1%, and a melt flow rate that satisfies the following equation: log ƒ≧-0.70 log η+2.83, where ƒ is the melt flow rate of the resin powder composition, and n is the specific melt viscosity at 372° C. of the tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
Claim 3
Dependent Claim
27 words
The rotational lining of claim 1 in which the tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer has a specific melt viscosity of 5×10 3 ˜1×10 6 poises at 372° C.
Claim 4
Dependent Claim
166 words
In the process of forming a rotational lining on a surface from granules of a composition consisting essentially of tetrafluoroethylene/perfluoro (alkyl vinyl ether) copolymer particles and heat resistant filler, the improvement comprising carrying out the formation of said rotational lining by (a) utilizing granules of said composition prepared so that it has (i) an average particle size of 70-1000 μm, (ii) a porosity of not more than 0.74, (iii) a specific shrinkage of not more than 5.1%, and (iv) a melt flow rate that satisfies the following equation: log ƒ≧-0.70 log η+2.83 where ƒ is the melt flow rate of the resin powder composition and η is the specific melt viscosity at 372° C. of the copolymer, and (b) incorporating into said composition from 0.05-5% by weight of polyphenylene sulfide particles having an average particle size of 0.3-50 μm to thermally stabilize said composition during the formation of said rotational lining to obtain as a resultant thereof a smooth, non-peeling, essentially bubble-free lining on said surface.
Claim 5
Dependent Claim
166 words
In the process of forming a rotational lining on a surface from granules of a composition consisting essentially of tetrafluoroethylene/perfluoro (alkyl vinyl ether) copolymer particles and heat resistant filler, the improvement comprising carrying out the formation of said rotational lining by (a) utilizing granules of said composition prepared so that it has (i) an average particle size of 70-1000 μm, (ii) a porosity of not more than 0.74, (iii) a specific shrinkage of not more than 5.1%, and (iv) a melt flow rate that satisfies the following equation: log ƒ≧-0.70 log η+2.83 where ƒ is the melt flow rate of the resin powder composition and η is the specific melt viscosity at 372° C. of the copolymer, and (b) incorporating into said composition from 0.05-5% by weight of polyphenylene sulfide particles having an average particle size of 0.3-50 μm to thermally stabilize said composition during the formation of said rotational lining to obtain as a resultant thereof a smooth, non-peeling, essentially bubble-free lining on said surface.
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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) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |