Aqueous dispersions for adhesives
AssigneeHoechst Aktiengesellschaft
InventorsBettina Gerharz, Helmut Hintz
Life of this patent
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Abstract
Aqueous dispersions prepared by polymerization of vinyl acetate, ethylene, and comonomers selected from the group consisting of vinyl esters of aliphatic (C.sub.3 -C.sub.18)-carboxylic acids, acrylic acid esters, methacrylic acid esters, and maleic acid diesters of aliphatic (C.sub.1 -C.sub.18)-alcohols in the presence of 0.05 to 0.95% by weight of .alpha.,.beta.-unsaturated carboxylic acids, 0 to 0.95% by weight of methacrylic acid esters or acrylic acid esters which carry epoxide or hydroxyl groups, and 1.5 to 20% by weight of cellulose ether, to form a copolymer having a glass transition temperature of -40.degree. to 0.degree. C. and comprising a cellulose ether in at least partly grafted form, are suitable as adhesives, for example, for gluing polyolefins.
Claims17
An aqueous dispersion which is prepared by aqueous polymerization of vinyl acetate, ethylene and more than 25% by weight based on the total weight of monomers employed of at least one comonomer selected from the group consisting of vinyl esters of aliphatic (C.sub.3 -C.sub.18)-carboxylic acids, acrylic acid esters, methacrylic acid esters, and maleic acid diesters of aliphatic (C.sub.1 -C.sub.18)-alcohols,
- in the presence of 0.05 to 0.95% by weight of .alpha., .beta.-unsaturated carboxylic acids, 0 to 0.95% by weight of methacrylic acid esters or acrylic acid esters which carry epoxide or hydroxyl groups, and 1.5 to 20% by weight of cellulose ether, in each case based on the total weight of the monomers employed
- to form an aqueous dispersion of a copolymer containing said cellulose ether in at least partly grafted form;
- wherein said copolymer has a glass transition temperature of -40.degree. to 0.degree. C.
A process for preparing an aqueous dispersion, which comprises aqueous polymerization of vinyl acetate, ethylene, and more than 25% by weight based on the total weight of monomers employed of at least one comonomer selected from the group consisting of vinyl esters of aliphatic (C.sub.3 -C.sub.18 )-carboxylic acids, acrylic acid esters, methacrylic acid esters, and maleic acid diesters of aliphatic (C.sub.1 -C.sub.18)-alcohols;
- in the presence of 0.05 to 0.95% by weight of .alpha.,.beta.-unsaturated carboxylic acids, 0 to 0.95% by weight of methacrylic acid esters or acrylic acid esters which carry epoxide or hydroxyl groups, and 1.5 to 20% by weight of cellulose ether, in each case based on the total weight of the monomers employed
- thereby forming an aqueous dispersion of a copolymer containing said cellulose ether in at least partly grafted form;
- wherein said copolymer has a glass transition temperature of -40.degree. to 0.degree. C.
Dependencies are inferred from the claim text.