Claims
- 1. A process for preparing powders of tetrafluoroethylene copolymers having a non-spherical particle shape, a frictional packing ratio of 20 to 100% and an average particle size of 5 to 500 .mu.m, which comprises producing a sheet of a tetrafluoroethylene/hexafluoropropylene copolymer or a tetrafluoroethylene/fluoro(vinyl ether) copolymer with rolls, and pulverizing the sheet.
- 2. The process of claim 1, wherein the tetrafluoroethylene copolymer in the form of sheet or in the pulverized form is subjected to fluorine gas treatment.
- 3. The process of claim 1, wherein the powder of tetrafluoroethylene copolymer is a powder which satisfies the following equation:
- log.mu.<2.45.rho..sub.1 +0.75
- in which .mu. represents an average particle sized of the powder and .rho..sub.1 represents a bulk density of the powder.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-307131 |
Dec 1986 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 135,217, filed Dec. 21, 1987, now U.S. Pat. No. 4,898,779.
US Referenced Citations (15)
Foreign Referenced Citations (5)
Number |
Date |
Country |
041687 |
Dec 1981 |
EPX |
88414 |
Sep 1983 |
EPX |
196903 |
Oct 1986 |
EPX |
0220910 |
May 1987 |
EPX |
2175591A |
Dec 1986 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
135217 |
Dec 1987 |
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