Method for manufacture of cast fluoropolymer-containing films at high productivity
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United States of America Patent
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Nov 28, 1989
Grant Date -
N/A
app pub date -
Aug 1, 1988
filing date -
Aug 1, 1988
priority date (Note) -
Expired
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Abstract
A method is provided for preparation of a fluoropolymeric film on a carrier, comprising: (a) preparing an aqueous dispersion comprising a fluoropolymer; (b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt; (c) passing the coated carrier belt through a metering zone to remove excess dispersion; (d) drying the metered coated carrier to remove the water from the dispersion; and (e) heating the dried coated carrier to a temperature sufficient to consolidate the dispersion, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidation temperature of the dispersion and a work of adhesion between the carrier belt and the dispersion that does not exceed the yield strength of the consolidated fluoropolymeric film.
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