Epoxy-modified vinyl chloride-vinyl ester copolymer solid resin
AssigneeWacker Chemie AG
InventorsStephan Kaiser, Karl Weber
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Abstract
A process for the preparation of epoxy-modified vinyl chloride-vinyl ester copolymers in the form of the solid resins involves aqueous, free radical polymerization of a mixture comprising a) from 50 to 90% by weight of vinyl chloride, b) from 5 to 25% by weight of epoxide-containing vinyl monomers and c) from 5 to 25% by weight of one or more vinyl esters of straight-chain or branched alkylcarboxylic acids having 1 to 18 carbon atoms, d) from 0 to 40% by weight of further comonomers copolymerizable with a), b) and c), the data in % by weight summing to 100% by weight, and subsequent drying of the aqueous dispersions obtained thereby, polymerization being effected by means of suspension polymerization in the presence of aldehyde regulators.
Claims18
A process for preparation of epoxy-modified vinyl chloride-vinyl ester copolymers as a solid resin, comprising free radically polymerizing an aqueous mixture comprising
- a) from 50 to 90 percent by weight of vinyl chloride,
- b) from 5 to 25 percent by weight of one or more epoxide-containing vinyl monomers b), selected from the group consisting of methyl glycidyl methacrylate, methyl glycidyl acrylate, allyl glycidyl ether, allylphenol glycidyl ether and glycidyl methacrylate, and
- c) from 5 to 25 percent by weight of one or more vinyl esters of straight-chain or branched alkylcarboxylic acids having from 1 to 18 carbon atoms c), selected from the group consisting of vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methyl vinyl acetate, vinyl pivalate and vinyl esters of α-branched monocarboxylic acids having 9 to 13 carbon atoms, and
- d) from 0 to 40 percent by weight of further monomer(s) d), different from a), b), and c), and copolymerizable with a), b) and c), the further monomers being selected from the group consisting of (meth)acrylate esters of C1-18 branched or straight chain alcohols and mixtures thereof, the percents by weight of a), b), c), and d) totaling 100% by weight,
- and subsequently drying an aqueous dispersion obtained thereby, wherein said polymerizing is effected by means of suspension polymerization with from 0.02 to 5 weight percent of one or more aldehyde regulators, and wherein from 0.005 to 0.05 weight percent of ascorbic acid and/or isoascorbic acid, and optionally from 0.001 to 0.1 weight percent of citric acid, based on the total weight of monomers a) through d) are present during and/or after polymerizing but prior to drying the aqueous dispersion to form a solid product.
A process for preparation of epoxy-modified vinyl chloride-vinyl ester copolymers as a solid resin, comprising free radically polymerizing an aqueous mixture comprising
- a) from 75 to 85 percent by weight of vinyl chloride,
- b) from 8 to 15 percent by weight of one or more epoxide-containing vinyl monomers selected from the group consisting of methyl glycidyl methacrylate, methyl glycidyl acrylate, allyl glycidyl ether, allylphenol glycidyl ether and glycidyl methacrylate as monomers b), and
- c) from 5 to 15 percent by weight of one or more vinyl esters of straight-chain or branched alkylcarboxylic acids having from 1 to 18 carbon atoms, selected from the group consisting of vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methyl vinyl acetate, vinyl pivalate and vinyl esters of α-branched monocarboxylic acids having 9 to 13 carbon atoms, and
- d) from 0 to 40 percent by weight of further comonomers different from a), b), and c), and copolymerizable with a), b) and c), the further monomers being selected from the group consisting of (meth)acrylate esters of C1-18 branched or straight chain alcohols and mixtures thereof, the percents by weight of a), b), c), and d) totaling 100% by weight,
- and subsequently drying an aqueous dispersion obtained thereby, wherein said polymerizing is effected by means of suspension polymerization with one or more aldehyde regulators in an amount of from 0.02 to 5% by weight based on the total weight of the monomers a) through d) polymerized, and wherein from 0.005 to 0.05 weight percent of ascorbic acid and/or isoascorbic acid, and optionally from 0.001 to 0.1 weight percent of citric acid, based on the total weight of monomers a) through d) are present during and/or after polymerizing but prior to drying the aqueous dispersion to form a solid product.
Dependencies are inferred from the claim text.