C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/296, 402/396
C08F 14/00 (2006.01) C08F 2/02 (2006.01) C08F 2/44 (2006.01) C08F 255/00 (2006.01) C08F 285/00 (2006.01)
Patent
CA 1102046
ABSTRACT OF THE DISCLOSURE An improved polyvinyl halide or a vinyl halide copolymer containing up to 50 percent of a comonomer can be obtained by post polymerizing in a single stage or two-stage bulk process in contact with a base polymer. the same or different monomer as the monomer used to form the base polymer. Compositions produced by the process of the invention are useful in making films, coated fabrics and molded objects. The liquid phase post polymerization process of the invention is applicable to base polymers in powder form prepared by emulsion, suspension and bulk polymerization processes. The base polymer can be present in a polymerization mixture in which only a partial amount of monomer has been converted to base polymer such as in a two-stage polymerization process or the base polymer can be used in dry, solid form. Polymers of the invention have improved bulk density and reduced plasticizer uptake and can be used to prepare fabric coatings. Copolymers prepared by the novel post-polymerization process of the invention which show increased impact strength in addition to improved bulk density and reduced plasticizer uptake are useful in the preparation of molding compounds. In the bulk polymeri- zation process of the invention, the addition of the same monomer or monomers or a different monomer or monomers subsequent to the partial conversion by a two-stage bulk process of polymerization of the vinyl halide monomer or monomers or vi??? halide monomer and comonomer, results in higher yield than can be obtained in the same reaction - 1 -
283933
Lemper Anthony L.
Pattison Victor A.
Witschard Gilbert
Hooker Chemicals & Plastics Corp.
Sherman
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