Aqueous dispersion of vinylidene fluoride copolymer, aqueous dispersion of vinylidene fluoride seed polymer and processes for preparation of the same
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United States of America Patent
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Sep 8, 1998
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N/A
app pub date -
Feb 27, 1997
filing date -
Aug 31, 1994
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Abstract
To provide an aqueous dispersion of a vinylidene fluoride (VdF) copolymer which can be prepared by emulsion-polymerizing VdF monomer with a reactive emulsifying agent and is excellent in stability against sedimentation because an average particle size of the copolymer is as small as not more than 200 nm and a solid content is as high as from 30 to 60% by weight; an aqueous dispersion of a VdF seed polymer which can be prepared by seed-polymerizing an ethylenically unsaturated monomer in the presence of particles obtained by emulsion-polymerizing VdF monomer with a reactive emulsifying agent and is excellent in stability against sedimentation because an average particle size of the seed polymer is as small as not more than 250 nm and a solid content is as high as from 30 to 60% by weight; and processes for preparation thereof.
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