Polytetrafluoroethylene molding resin and processes
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Oct 18, 1995
filing date -
Feb 23, 1993
priority date (Note) -
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Abstract
In this invention a new form of polytetrafluoroethylene has been found to be compression moldable to provide strong molded articles. It is also useful as an additive or strength binder. The new form is a compression molding powder comprised of comminuted, sheared particles of expanded porous polytetrafluoroethylene, said particles having a nudular-microfibrillar structure of irregular shape, and a mean particle size between 5 and 500 micrometers, and having a coating of a thermoplastic fluoropolymer on at least a portion of the particle. By irregular shape is meant that the nodes and fibrils do not have an ordered arrangement. The bulk density is about 0.06 to 0.2 g/cc.
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