Porous polytetrafluoroethylene material

Details Porous polytetrafluoroethylene material Porous polytetrafluoroethylene material

C - Chemistry, Metallurgy

08

J

18/29

C08J 9/36 (2006.01) B29C 55/00 (2006.01) B29C 67/20 (2006.01) C08J 5/18 (2006.01) C08J 9/28 (2006.01)

Patent

CA 1242556

- 1 - Abstract: The invention provides a porous polytetrafluoro- ethylene material produced by forming a mixture of a suitable amount of a liquid lubricant and a fine powder of polytetra- fluoroethylene having an average molecular weight of at least 6,000,000, an amorphous index larger than 0.1 and a number average primary particle size of 0.1 to 0.8 microns, and a clear endothermic peak at a temperature of 347+3°C and another endothermic peak or shoulder at a temperature between 330°C and the temperature of said clear endothermic peak on a crystalline melting chart recorded by a differential scanning calorimeter, removing the lubricant to obtain an unsintered PTFE material and expanding the unsintered polytetrafluoroethylene material at least monoaxially at a temperature higher than the melting point of the polytetra- fluoroethylene.

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