Process for making vinyl fluoride interpolymers and dispersions thereof
AssigneeE. I. Du Pont de Nemours and Company
InventorRonald Earl Uschold
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Abstract
Interpolymers of 1-99 mol % vinyl fluoride and 99-1 mol % of at least one highly fluorinated monomer such as tetrafluoroethylene are disclosed. The interpolymers are characterized by the presence of ionic end groups and are prepared by polymerizing VF and fluorinated monomer in water with water-soluble free-radical initiators such as azoamidine initiators or persulfate initiators at temperatures within the range of 60 to 100° C. and reactor pressures within the range of 1 to 12 MPa (145 to 1760 psi). The invention further provides for protective self-supporting films and coatings formed from nonaqueous dispersions of the interpolymers, both for use on the surfaces of substrates including metal, plastic, ceramic, glass, concrete, fabric and wood.
Claims28
A process for preparing an interpolymer comprising polymerizing, in an emulsion polymerization process, vinyl fluoride and at least one highly fluorinated monomer in water with a water soluble free-radical initiator at a temperature in the range of 60 to 100° C. and a pressure in the range of 1 to 12 MPa, said vinyl fluoride and said at least one highly fluorinated monomer being employed in amounts which produce an interpolymer comprising polymer units derived from 10-90 mol % vinyl fluoride and 90-10 mol % of at least one highly fluorinated monomer.
An aqueous dispersion comprising about 70 to 95% by weight water and 5 to 30% by weight of an interpolymer dispersed therein comprising polymer units derived from 10-90 mol % vinyl fluoride and 90-10 mol % of at least one highly fluorinated monomer, said interpolymer being characterized by the presence of ionic end groups.
A nonaqueous dispersion comprising a polar organic solvent and particles of the interpolymer dispersed therein comprising polymer units derived from 10-90 mol % vinyl fluoride and 90-10 mol % of at least one highly fluorinated monomer, said interpolymer being characterized by the presence of ionic end groups.
Dependencies are inferred from the claim text.