Document Type and Number:
Japanese Patent JPS4826387
Kind Code:
B1
Abstract:
Aqueous dispersions of synthetic resins are prepared by copolymerizing 20 to 40 weight per cent of vinyl chloride, 20 to 50 weight per cent of a vinyl ester with 1 to 3 carbon atoms in the acid residue and 25 to 50 weight per cent of a compound of formula R1CH = CR2COOR3, where R1 is hydrogen or COOR3, R2 is hydrogen or methyl and R3 is a C4- 8 alkyl group, in aqueous dispersion in the presence of 2 to 6% by weight of the monomers of a non-ionic protective colloid, 0.1 to 3% by weight of the monomers of a non-ionic emulsifier, a polymerization accelerator and a buffer such that the pH is 4.5 to 5 at the beginning of the polymerization and not less than 3 at the end. Polymerization may be effected in the presence of a plasticizer, e.g. dibutyl phthalate and citric, phosphoric and glycol esters. The compound may be an ester of maleic, fumaric, methacrylic or acrylic acid, e.g. butyl acrylate or 2-ethylhexyl acrylate. The protective colloid may be polyvinyl alcohol, poly-N-vinyl pyrrolidone or hydroxymethyl cellulose. The emulsifier may be a condensate of ethylene oxide with ethanolamines, sorbitol, fatty acids, amides or alcohols, tall oil or alkyl phenols. Favourable particle size distribution may be obtained by first preparing a primary latex of the vinyl ester polymer in which the three monomers are subsequently polymerized. The accelerators may be water-soluble peroxides or persulphates. The dispersions may be used as binders for pigments, e.g. in paints, and as cement and concrete additives, due to their stability to saponification. Examples describe the copolymerization of vinyl chloride and vinyl acetate with (1, 2, 5 and 6) butyl acrylate, (3) ethylhexyl acrylate and (4) dibutyl maleate in aqueous media in the presence of ethylene oxide/nonyl phenol condensates, disodium phosphate, potassium persulphate and dibutyl phthalate together with (1 to 5) polyvinyl alcohol and (6) hydroxyethyl cellulose, in the presence of primary latices of polyvinyl acetate. Comparative examples describe dispersions of (7) polyvinyl acetate, (8) vinyl acetate/ethylhexyl acrylate copolymer, (9 and 10) vinyl chloride/vinyl acetate copolymers and (11) vinyl propionate/acrylic ester copolymers.ALSO:Additives to hydraulic cements comprise aqueous synthetic resin dispersions prepared by copolymerizing 20 to 40 weight per cent of vinyl chloride, 20 to 50 weight per cent of a vinyl ester with 1 to 3 carbon atoms in the acid residue and 25 to 50 weight per cent of a compound of formula R1CH=CR2COOR3 where R1 is hydrogen or COOR3, R2 is hydrogen or methyl and R3 is a C4-8 alkyl group, in aqueous dispersion in the presence of 2 to 6% by weight of the monomers of a non-ionic protective colloid, 0.1 to 3% by weight of the monomer of a non-ionic emulsifier, a polymerization accelerator and a buffer such that the pH is 4.5 to 5 at the beginning of the polymerization and not less than 3 at the end. The compound may be an ester of maleic, fumaric, methacrylic or acrylic acid, e.g. butyl acrylate or 2-ethylhexyl acrylate.
Application Number:
JP3194865A
Publication Date:
August 09, 1973
Filing Date:
June 01, 1965
Export Citation:
International Classes:
C08F214/00; B60G5/04; B60G11/26; B62D21/20; B62D61/10; C04B20/10; C04B24/26; C04B28/02; C08F2/00; C08F2/18; C08F2/20; C08F2/30; C08F14/00; C08F214/06; C08F218/04; C08F220/18; C08F222/14; C08F261/04; C09D127/04; (IPC1-7): C08F15/40