Patent ID: 7199196
Filing Date: 2007-04-03
Classification: C08F

Abstract:
1. Method for treating a fibrous substrate comprising contacting the fibrous substrate with an aqueous fluoropolymer dispersion comprising poly(perfluorovinyl ether) homopolymers of polymerized monomer units of the formula: wherein R f represents a perfluorinated organic group having a chain length of at least 2 atoms and having at least one carbon atom and at least one oxygen atom, wherein said poly(perflourovinyl ether) homopolymer dispersion by the steps of: a. pre-emulsifying an aqueous mixture of a perflourovinyl ether in the presence of a flourochemical emulsifier to an average emulsion droplet size of one micron or less, and b. polymerizing said perflourovinyl ether in the presence of an initiator at temperature and for a time sufficient to produce particles of poly(perflourovinyl ether).