Patent ID: 7084225
Filing Date: 2006-08-01
Classification: C08F,Y10T

Abstract:
1. A process for the copolymerization of a tetrafluoroethylene copolymer of the fine powder type, said copolymer containing essentially from 99.4% by weight to 99.98% by weight tetrafluoroethylene monomer units and from 0.02% by weight to 0.6% by weight copolymerized (perfluorobutyl)ethylene comonomer units, comprising: (a) copolymerizing said monomer and comonomer in a pressurized reactor, and (b) initiating said copolymerization by adding potassium permanganate (KMnO (c) carrying out the entire reaction in the absence of any ionic strength enhancer, and (d) stopping the addition of (KMnO said copolymer has a primary raw dispersion particle size (RDPS) in the range between 0.175 microns to and including 0.203 microns and has a standard specific gravity (SSG) of less than 2.143.