Process for preparing polytetrafluoroethylene granular powder co

Details Process for preparing polytetrafluoroethylene granular powder co Process for preparing polytetrafluoroethylene granular powder co

1992-11-09

1994-06-14

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523213, 523214, 524546, C08K 906, C08K 320, C08J 300, C08L 2712

Patent

active

053210590

ABSTRACT:
A process for preparing a filler-containing PTFE granular powder, which comprises mixing uniformly a PTFE powder having an average particle size of not more than 100 .mu.m and a (semi-)hydrophilic filler which is surface-treated with an organosilane of the formula: ##STR1## in a two-phase liquid medium comprising water and a water-insoluble organic liquid having a surface tension of not more than 35 dynes/cm at 25.degree. C. Accordingly to the process, the separation of filler can be avoided, and a colorless molded article can be provided.

REFERENCES:
patent: 3929721 (1975-12-01), Leverett
patent: 3998770 (1976-12-01), Malhotra
patent: 4370436 (1983-01-01), Nakamura et al.
patent: 4454288 (1984-06-01), Lee et al.

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