Aqueous vinyl acetate ethylene copolymer dispersion for paper coating
AssigneeWacker Chemie AG
InventorsYong Hae Choi, Jong Bok Kim, Woo Jae Lee
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Abstract
The invention relates to a polymer dispersion for paper coating compositions obtainable by means of a radically initiated, aqueous emulsion polymerization of a) 60 to 97% by weight of vinyl acetate, b) 2 to 30% by weight of ethylene, c) 0.5 to 5% by weight of at least one ethylenically unsaturated silane monomer, d) 0.5 to 5% by weight of at least one ethylenically unsaturated carboxylic acid, based in each case on the total weight of the monomers used for the polymerization, and the data in % by weight summing in each case to 100% by weight, in the presence of one or more polymeric emulsifiers.
Claims14
A paper coating composition comprising from 50 to 99% by weight of the solids in the composition of one or more pigments, and from 1 to 50% by weight of the solids in the composition of a polymeric binder in the form of a polymer dispersion obtained by a radically initiated, aqueous emulsion polymerization, in the presence of one or more polymeric emulsifiers, of
- a) 60 to 97% by weight of vinyl acetate,
- b) 2 to 30% by weight of ethylene,
- c) 0.5 to 5% by weight of at least one ethylenically unsaturated silane monomer, and
- d) 0.5 to 5% by weight of at least one ethylenically unsaturated carboxylic acid comonomer,
- based in each case on the total weight of the monomers used for the polymerization, and the data in % by weight summing in each case to 100% by weight,
- wherein the coating composition is present as a coating on a paper support material.
A process for preparing a paper sheet having a coating layer, comprising coating a paper support material with a paper coating composition comprising from 50 to 99% by weight of the solids in the composition of one or more pigments, and from 1 to 50% by weight of the solids in the composition of a polymeric binder in the form of a polymer dispersion obtained by means of a radically initiated, aqueous emulsion polymerization, in the presence of one or more polymeric emulsifiers, of
- a) 60 to 97% by weight of vinyl acetate,
- b) 2 to 30% by weight of ethylene,
- c) 0.5 to 5% by weight of at least one ethylenically unsaturated silane monomer, and
- d) 0.5 to 5% by weight of at least one ethylenically unsaturated carboxylic acid comonomer,
- based in each case on the total weight of the monomers used for the polymerization, and the data in % by weight summing in each case to 100% by weight.
Dependencies are inferred from the claim text.