Process for preparing polytetrafluoroethylene granular powder

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

1977-11-22

1980-12-23

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

264117, 425DIG101, 528494, 528497, 528498, 528499, B32B 516, C08F 600, C09C 156

Patent

active

042411378

ABSTRACT:
A process for preparing a polytetrafluoroethylene granular powder which comprises subjecting a finely divided polytetrafluoroethylene to agitation in an aqueous medium consisting of water and organic liquid having a specific surface tension and being incompatible with water in an apparatus to form agglomerates, passing said agglomerates through a crushing mechanism and continuously recycling said crushed agglomerates for further agitation and crushing, said crushing mechanism being capable of lowering an average particle size of the agglomerates composed of primary particles having a particle size of 1 to 200.mu. by partially crushing agglomerated particles having an improper large particle size or abnormally large aggregates. The obtained polytetrafluoroethylene granular powder has a narrow size distribution and an improved flowability, in which at least 90% by weight of a whole granular powder has a particle size of at most 1000.mu. and an average particle size of the granular powder falls in the range of 100 to 500.mu. and at least 60% by weight of a whole granular powder has a particle size of 0.7 to 1.3 times its average particle size.

REFERENCES:
patent: 3265679 (1966-08-01), Black et al.
patent: 3527857 (1970-09-01), Fitz
patent: 4123606 (1978-10-01), Malhotra

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