Process for preparing polyvinylidene fluoride copolymer
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United States of America Patent
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Apr 24, 2007
Grant Date -
Nov 3, 2005
app pub date -
Sep 17, 2003
filing date -
Sep 25, 2002
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Abstract
The present invention provides a polyvinylidene fluoride copolymer capable of forming a uniform film, a solution of the copolymer and a thin film comprising the polyvinylidene fluoride copolymer. The polyvinylidene fluoride copolymer of the present invention is characterized in that the ratio of the scattered-light intensity (I) for a 15% solution of the polyvinylidene fluoride copolymer in dimethylformamide solvent to the scattered-light intensity (I.sub.0) for dimethylformamide, (I/I.sub.0), is 10 or lower. The polyvinylidene fluoride copolymer solution comprises the polyvinylidene fluoride copolymer and an organic solvent capable of dissolving the copolymer.
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