| 摘要 |
PCT No. PCT/JP94/01558 Sec. 371 Date Mar. 22, 1996 Sec. 102(e) Date Mar. 22, 1996 PCT Filed Sep. 22, 1994 PCT Pub. No. WO95/08580 PCT Pub. Date Mar. 30, 1995A process for preparing low molecular weight polytetrafluoroethylene having a melting point of 250 DEG C. to 325 DEG C. comprising polymerizing tetrafluoroethylene in at least one polymerization solvent selected from the group consisting of hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons which have boiling points in the range between -10 DEG C. and 70 DEG C. under constant pressure by the supplement of tetrafluoroethylene. According to this process, the low molecular weight polytetrafluoroethylene which is useful as an additive to various materials is produced in the solvent which has a low ozone destruction factor or does not destroy the ozone, under economically advantageous low pressure which can be controlled safely.
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