Dow Global Technolgoies LLC

The Dow Chemical Company

Rohm and Haas Company

Larry N Hyman

Harry R Heulings, Iv

Kim Struble

Harry R Heulings

An aqueous tape joint compound including: an inorganic filler; an emulsion polymer binder; cellulose ether thickener; water; and from 0.01 to 1.3% by weight based on the weight of the aqueous joint compound, water-soluble polymer or salts thereof, the water-soluble polymer selected from the group consisting of (a) polymer consisting essentially of, as polymerized units, from 50% to 100%, by weight based on the weight of the polymer, acrylic acid, and from 0% to 50%, by weight based on the weight of the polymer, second monoethylenically unsaturated acid monomer, (b) diisobutylene-maleic anhydride polymer, and (c) mixtures thereof; the water-soluble polymer having a weight average molecular weight of from 1500 to 75,000 and a calculated Tg of from 80&#xb0; C. to 250&#xb0; C.; the aqueous tape joint compound being substantially free from calcium sulfate hemihydrate is provided.

Tape joint compound

The present invention relates to an aqueous dispersion comprising (a) at least one (meth)acrylic polymer; (b) at least one vinyl acetate polymer selected from vinyl acetate homopolymer and vinyl acetate copolymers comprising in polymerized form vinyl acetate and ethylene; (c) water; and (d) optionally up to 50% by weight of an inorganic filler, based on the total weight of the aqueous dispersion, wherein the weight ratio of (meth)acrylic polymer(s) (a) to vinyl acetate polymer(s) (b) is from 70:30 to 30:70. The aqueous dispersion may be used as a joint compound or sealing compound.

Aqueous dispersion comprising a (meth)acrylic polymer and a vinyl acetate polymer

The use of calcium oxide or calcium hydroxide as a crack-inhibiting additive for tape joint compositions is disclosed. Tape joint compositions containing calcium oxide or calcium hydroxide maintain their workability while experiencing less cracking upon drying.

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Midland, MI, United States of America

Larry N Hyman