Vinylidene fluoride copolymers

摘要

The invention relates to a copolymer composition of poly(vinylidene fluoride-trifluoropropene) copolymers. The copolymers formed have excellent optical properties, with very low haze, as well as high melting points, excellent flexibility and toughness.

主权项

1. A heterogeneous copolymer composition comprising a heterogeneous copolymer having 7 to 10 weight percent of 3,3,3-trifluoropropene (TFP) monomer units and 90 to 93 weight percent of vinylidene fluoride monomer units, wherein said copolymer has a melting point of 150° C. or higher and a crystallinity of less than 23 percent, and wherein said copolymer composition is optically clear, having a haze level of less than 24 percent and a light transmission of greater than 85 percent as measured by ASTM D1003-07 on samples of 35 micron thickness, wherein during the polymerization of the heterogeneous copolymer there is an initial monomer charge wherein the initial monomer charge consists of vinylidene fluoride, and wherein a mixture of vinylidene fluoride and TFP are subsequently delay fed to the polymerization reactor, with all of the TFP being added to the reactor in the delay feed.