Polytetrafluoroethylene fine powder and process for producing th

Details Polytetrafluoroethylene fine powder and process for producing th Polytetrafluoroethylene fine powder and process for producing th

1981-06-25

1983-08-09

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 78, 526255, C08F11426

Patent

active

RE0313416

ABSTRACT:
Polytetrafluoroethylene fine powders which have an average molecular weight of not less than 5,000,000, preferably not less than 5,500,000, an amorphous index of not more than 0.1, preferably not more than 0.09, a number average primary particle size of 0.1 to 0.4 micron, preferably 0.15 to 0.38 micron, and a sharp endothermic peak at a temperature between 343.degree. C. and 350.degree. C. on the melting diagram by a differential scanning calorimeter, said sharp peak having an endothermic ratio of not more than 0.3, preferably not more than 0.27, and a half value width of the endothermic peak of not more than 8 degrees, preferably not more than 6 degrees, and a process for producing the polytetrafluoroethylene fine powders. The polytetrafluoroethylene fine powders have an excellent stretchability and are useful for electric wire coating, small diameter tubes, large diameter tubes, sealing tapes and the like.

REFERENCES:
patent: 3819594 (1974-06-01), Holmes et al.
patent: 3945985 (1976-03-01), Feiler et al.
patent: 3953412 (1976-04-01), Saito et al.
patent: 3981853 (1976-09-01), Manwiller

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