Patent ID: 9593046
Date: 2017-03-14
CPC Classifications: C04B,C08L,C09D,C09J

Claim:
1. A dry mortar composition comprising: a) 5 to 50% by weight, based on the total weight of the dry mortar composition, of a mineral binder; b) 30 to 90% by weight, based on the total weight of the dry mortar composition, of filler; c) a spray-dried water-redispersible polymer powder comprising a copolymer selected from the group consisting of (i) copolymers of vinyl acetate and from 5 to 50% by weight of ethylene, (ii) copolymers of vinyl acetate and from 0 to 50% by weight of ethylene and from 1 to 50% by weight of a vinyl ester of alpha-branched monocarboxylic acids having from 9 to 11 carbon atoms, (iii) copolymers of 30 to 75% by weight of vinyl acetate and from 1 to 30% by weight of vinyl laurate or vinyl esters of an alpha-branched carboxylic acid having from 9 to 11 carbon atoms and from 1 to 30% by weight of (meth)acrylic esters of unbranched or branched alcohols having from 1 to 15 carbon atoms and from 0 to 40% by weight of ethylene, (iv) copolymers of 50 to 95% by weight of vinyl acetate and from 5 to 50% by weight of (meth)acrylic esters of unbranched or branched alcohols having from 1 to 15 carbon atoms, and (v) copolymers of vinyl acetate and from 5 to 50% by weight of ethylene and from 1 to 60% by weight of vinyl chloride, wherein the copolymers can additionally contain auxiliary monomers and weight percents in each case add up to 100% by weight; and an adhesion-promoting additive combination, said additive composition comprising: one or more polyalkylenoxides out of the group comprising polypropylene oxides and ethylene oxide-propylene oxide copolymers; and one or more starch ether derivatives out of the group comprising carboxyalkyl starch ethers and their alkali salts, and hydroxyalkyl starch ethers, and wherein the water-redispersible polymer powder comprises the adhesion promoting additive combinations.