C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 18/08 (2006.01) C08F 6/16 (2006.01) C08J 3/05 (2006.01) C08L 31/04 (2006.01) C09J 131/04 (2006.01)
Patent
CA 2240208
Method of producing dry polyvinyl acetate particles that are readily dispersible in water, are vinyl acetate substantially monomer-free and are useful for making polyvinyl acetate dispersion compositions that are low in odor, form clear dried films and may be used in adhesives, sealants, caulks and coatings. The method includes manufacturing an aqueous, e.g. water, dispersion of polyvinyl acetate containing polyvinyl alcohol; drying to remove volatiles by converting the dispersion to dry form under controlled temperature conditions and redispersing the dried polyvinyl acetate particles in an aqueous medium to form a polyvinyl acetate dispersion that is substantially free of vinyl acetate monomer.
Méthode pour produire des particules de poly(acétate de vinyle), facilement hydrodispersables et pratiquement exemptes d'acétate de vinyle monomère; elles sont utiles pour l'obtention de compositions donnant des dispersions de poly(acétate de vinyle) peu odorantes et formant des pellicules séchées transparentes, qui peuvent servir dans les adhésifs, les scellants, les isolants et les revêtements. La méthode comprend la préparation d'une dispersion, p. ex. aqueuse, de poly(acétate de vinyle) renfermant du poly(alcool vinylique); le séchage pour éliminer les composés volatils, par conversion de la dispersion en forme sèche dans des conditions de température déterminées, et redispersion des particules de poly(acétate de vinyle) séchées dans un milieu aqueux pour former la dispersion de poly(acétate de vinyle), pratiquement exempte d'acétate de vinyle monomère.
Columbus Peter S.
Patel Yogeshbhai Babubhai
Elmer's Products Inc.
Macrae & Co.
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