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US 11,692,047 B2Granted
Manufacturing method for low molecular weight polytetrafluoroethylene
AssigneeDaikin Industries, Ltd.
InventorsMasayuki Tsuji, Yuuji Tanaka, Hirokazu Yukawa
Life of this patent
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Abstract
A method for producing low molecular weight polytetrafluoroethylene which includes: (1) feeding into an airtight container in the absence of oxygen: high molecular weight polytetrafluoroethylene: and a halogenated polymer having a halogen atom other than a fluorine atom; and (2) irradiating the high molecular weight polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s.
Claims5
A method for producing low molecular weight polytetrafluoroethylene, comprising:
- (1) feeding into an airtight container in the absence of oxygen:
- high molecular weight polytetrafluoroethylene having a standard specific gravity of 2.130 to 2.230:
- and
- a halogenated polymer having a halogen atom other than a fluorine atom;
- and
- (2) irradiating the high molecular weight polytetrafluoroethylene at a temperature of 320° C. or lower to provide low molecular weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s.
3 more elements
Dependencies are inferred from the claim text.