Polytetrafluoroethylene molding powder

Details Polytetrafluoroethylene molding powder Polytetrafluoroethylene molding powder

1995-06-06

1998-01-20

Schofer, Joseph L.

Stock material or miscellaneous articles

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

Particulate matter

526247, 526255, B32B 516

Patent

active

057099448

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.

REFERENCES:
patent: 2393967 (1946-02-01), Brubaker
patent: 3331822 (1967-07-01), Kametani et al.
patent: 3953412 (1976-04-01), Saito et al.
patent: 4036802 (1977-07-01), Poirier
patent: 4078134 (1978-03-01), Kuhls et al.
patent: 4078135 (1978-03-01), Sulzbach et al.
patent: 4123606 (1978-10-01), Malhotra
patent: 4379900 (1983-04-01), Sulzbach
patent: 4898799 (1990-02-01), Yoshimura et al.
patent: 5153285 (1992-10-01), Felix et al.
patent: 5176958 (1993-01-01), Shimizu et al.
patent: 5284708 (1994-02-01), Shimizu et al.
"Modified TFE polymer as powder with a high bulk density and good flow properties" Sulzbach Mar. 1981, DE8/-3110193 abstract, pp. 66, 67.
"TFE copolymers for pressurefree sintering" Felix et al, DE93-4335705, Oct. 1993 pp. 46, 47 abstract.
"Preparation of perfluoroalkylvinylether tetrafluoroethylene copolymers with thermal disobration 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.
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.

Affiliated with

Also associated with

Rating

Polytetrafluoroethylene molding powder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polytetrafluoroethylene molding powder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polytetrafluoroethylene molding powder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-723913