Abstract: Modified PTFE fine powder which comprises colloidal particles of a copolymer comprising repeating units derived from tetrafluoroethylene and 0.02 to 0.3 % by weight, preferably 0.03 to 0.2% by weight of repeating units derived from at least one fluoroalkyl vinyl ether selected from compounds of the formula:X(CF.sub.2).sub.n OCF.dbd.CF.sub.2 (I)wherein X is a hydrogen, fluorine or chlorine atom and n is an integer of 1 to 6, andC.sub.3 F.sub.7 (OCF.sub.2 CF.sub.2 CF.sub.2).sub.m [OCF(CF.sub.3)CF.sub.2 ].sub.1 OCF.dbd.CF.sub.2 (II)wherein m and 1 are each an integer of 0 to 4 provided that at least one of them is not zero, which has a number average particle size of 0.05 to 0.6 .mu.m, wherein the copolymer has a specific melt viscosity of from 6.times.10.sup.10 to 30.times.10.sup.10 poise, preferably from 8.0.times.10.sup.10 to 25.times.10.sup.10 poise at 380.degree. C. and a standard specific gravity (SSG, hereinafter defined) of from 2.135 to 2.175, preferably from 2.140 to 2.
Type:
Grant
Filed:
October 8, 1992
Date of Patent:
February 8, 1994
Inventors:
Tetsuo Shimizu, Kazutaka Hosokawa, Masuo Kokumai, Makoto Ono
Abstract: An inorganic antimony compound that is surface modified with up to about 10 percent by weight of a polysiloxane results in a flame retardant with improved rheology, flow, storage and dispersing characteristics.
Type:
Grant
Filed:
March 29, 1982
Date of Patent:
July 19, 1983
Assignee:
Union Carbide Corporation
Inventors:
Julius J. Stratta, Lloyd M. Robeson, Richard V. Girardi
Abstract: A composition comprising an intimate mixture of a polyarylene sulphide with an aryl ester of an aryl alcohol, the ester being in solid solution in the resin. The preferred mixture comprises polyphenylene sulphide and benzyl benzoate. There is also described a method of curing polyarylene sulphide in which the solid solution of the ester in the resin is formed and this is heated so that the ester evaporates and the resin cures simultaneously.