Patent ID: 8404782
Filing Date: 2013-03-26
Classification: C08F,C08J,C08L,C09D

Abstract:
1. A method for producing a fluorine-containing polymer powder comprising the steps of: mixing fluorine-containing polymer powder A which has not been treated with a fluorinating agent with fluorine-containing polymer powder B, which is prepared by contacting fluorine-containing polymer powder A with a fluorinating agent so that the total number of —CH increasing a density of the fluorine-containing polymer powder so that a specific gravity reaches at least 90% of the true specific gravity of the fluorine-containing polymer, milling the mixture, air classifying the milled mixture to remove fine particles and fibrous particles in an amount of 3 to 40% of the whole particle size distribution of the milled mixture, and classifying the residual mixture to remove coarse particles in an amount of 1 to 20% of the whole particle size distribution.