Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-12-22
1989-08-22
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525902, C08F25908
Patent
active
048597457
ABSTRACT:
The invention is a process for producing a modified polytetrafluoroethylene which comprises polymerizing tetrafluoroethylene in an aqueous medium containing a dispersing agent with a polymerization initiator source and then, copolymerizing tetrafluoroethylene one or more fluorinated modifiers having an acid functional group or a functional group which is convertible to the acid group as a copolymerizable modifier in the presence of the resulting polytetrafluoroethylene to a polymerization point past the Kraft point to produce highly porous, fibrous, stratified fluoropolymers having cores made of homopolymer of poly-tetrafluoroethylene coated with sheath layers which are made of a copolymer of polytetrafluoroethylene and one or more modifiers.
The invention also includes a highly porous, fibrous, stratified fluoropolymer having a plurality of interconnected, fibrous-like projections wherein the stratified fluoropolymer has a core layer of polytetrafluoroethylene substantially completely covered by a copolymer of polytetrafluoroethylene and a fluorocarbon modifier.
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Aikman, Jr. Robert E.
Carl William P.
Tasset Emmett L.
Berman Susan
Bleutge John C.
The Dow Chemical Company
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