| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polymerization process for producing a tetrafluoroethylene copolymer, and to provide the copolymer produced thereby. <P>SOLUTION: The copolymer is of the dispersion/fine powder type and contains polymerized tetrafluoroethylene monomer units and co-polymerized higher homologous comonomer units having the formula (C<SB POS="POST">n</SB>F<SB POS="POST">(2n+1)</SB>)CH-CH<SB POS="POST">2</SB>, wherein 6≤n<10, in which the primary particles are believed to have a core and shell structure and the polymerized comonomer units are present in an amount from 0.01 to 0.3 mol%, based upon total copolymer composition. The copolymer has a raw dispersion primary particle size (RDPS) of less than 0.210 μm coupled with a standard specific gravity (SSG) of less than 2.143. Preferably the copolymer has comonomer units present in an amount from 0.05 and 0.25 mol% and the RDPS is within the range between 0.178 and 0.200 μm, coupled with a SSG of less than 2.140. The copolymers, (perfluorohexyl)ethylene (PFHE), and (perfluorooctyl)ethylene (PFOE), may be shaped into the form of 0.1 inch diameter expanded beading, which expanded beading can have a break strength of at least 10.0 lbs, and which may exceed 13.0 lbs. <P>COPYRIGHT: (C)2012,JPO&INPIT |
