High melting fluoropolymers
AssigneeArkema Inc.
InventorsRamin Amin-Sanayei, Caiping Lin
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Abstract
The invention relates to a method for making copolymers of 2,3,3,3-tetrafluoropropene and vinylidene fluoride by an emulsion polymerization process having unexpectedly high melting temperatures, even at low crystallinity levels. The invention involves adjusting the microstructure of the copolymers through a controlled polymerization to obtain controlled microstructure copolymers with unique properties, including those with high melting temperature and low crystallinity.
Claims8
A controlled microstructure copolymer composition comprising a copolymer having from 1 to 99 weight percent of 2,3,3,34etrafluoropropene monomer units and 1 to 99 weight percent of vinylidene fluoride monomer units, wherein said is formed by a semi-batch process in which the ratio of 2,3,3,3-copolymer tetrafluoropropene to vinyliderie fluoride in the initial charge is from 0,1 to 0.9 times, or from 1,1 to 10 times the steady state monomer ratio.
Dependencies are inferred from the claim text.