Polytetrafluoroethylene molding powder

Details Polytetrafluoroethylene molding powder Polytetrafluoroethylene molding powder

1995-06-06

1998-06-09

Schofer, Joseph L.

Stock material or miscellaneous articles

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

Particulate matter

526247, 526255, B32B 516

Patent

active

057630828

ABSTRACT:
Polytetrafluoroethylene molding powder which comprises 0.01 to 1% by weight of a perfluoro(vinyl ether) unit and which has a heat of crystallization of 18.0 to 25.0 J/g. The molding powder provides a molded article which has a flex life of not less than 7 million cycles, a creep resistance (total deformation at 200.degree. C.) of not more than 20%, and a creep resistance (total deformation at 25.degree. C.) of not more than 15%. The polytetrafluoroethylene molding powder which is excellent in both creep resistance and flex fatigue resistance is provided as a molding material for parts which are repeatedly bent such as pump.

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"Modified TFE polymer as powder with a high bulk density and good flow properties" Sulzbach Mar. 1981 abstract pp. 66 and 67-DE81-3110193.
"TFE copolymers for preform free sintering" Felix et al. DE93-4335705 Oct. 1993 pp. 46 and 47 abstract.
"Preparation of perfluroalkyl vinyl ether-tetrafluoroethylene copolymers with thermal discoloration resistance" Felix et al. DE93-4332712 abstract pp. 47, 48.
"Aqueous suspension polymerization of TFE" Felix et al. DE90-4022405 abstract pp. 53 and 54.
International Search Report for International appln. No.PCT/JP93/00140 Supplementary European Search Report for Appln. No. EP 93 90 3310 dated Jun. 6, 1994.

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