Claims
- 1. A polymer powder produced by drying aqueous polymer dispersions in the presence of a driving assistant, wherein the polymer in the polymer dispersion to be dried has a glass transition temperature TG of below 65° C. and wherein the drying assistant comprises at least one copolymer or salt thereof which in copolymerized form comprises based in each case on the overall number of copolymerized monomers.from 20 to 95 mol %of at least one ethylenically unsaturatedcarboxylic acid having 3 to 6 C atoms(monomers A)from 5 to 80 mol %of at least one hydroxylalkyl ester of anethylenically unsaturated carboxylic acidhaving 3 to 6 C atoms (monomers B) andup to 10 mol %of further monomers C.
- 2. The polymer powder of claim 1 wherein the polymer in said aqueous polymer dispersion comprisesfrom 80 to 100% by weight of at least one monomer, a, selected from C2-C6 olefins, vinylaromatic compounds; esters of ethylenically unsaturated C3-C6 monocarboxylic acids or C4-C8 dicarboxylic acids and C1-C12-alkanols or C5-C10-cycloalkanols; vinyl esters or (meth)allyl esters of aliphatic C1-C20 carboxylic acids; conjugated dienes; and from 0 to 20% by weight of at least one other monomer, b, which has at least one ethylenically unsaturated group.
- 3. A polymeric binder comprising the polymer powder of claim 1.
- 4. A method, comprising:mixing from 0.1 to 20% by weight of the polymer powder of claim 1; from 20 to 60% by weight of at least one mineral binder; up to 25% by weight of an auxiliary; and a remaining amount of an additive selected from the group consisting of sand, a filler, a pigment, a natural fiber, a synthetic fiber and a mixture thereof, to obtain a dry mineral building material.
- 5. A method, comprising:free radical polymerizing a) from 80 to 100% by weight of at least one monomer selected from the group consisting of C2-C6 olefins, vinylaromatic compounds, esters of ethylenically unsaturated C3-C6 monocarboxylic acids or C4-C8 dicarboxylic acids with C1-C12 alkanols or C5-C10 cycloalkanols, vinyl esters of aliphatic C1-C20 carboxylic acids, (meth)allyl esters of aliphatic C1-C20 carboxylic acids and conjugated dienes, and b) from 0 to 20% by weight of at least one other monomer which has at least one ethylenically unsaturated group in an aqueous emulsion in the presence of the polymer powder according to claim 1.
- 6. A method, comprising:(I) free radical polymerizing A) from 20 to 95 mol % of at least one ethylenically unsaturated carboxylic acid having 3 to 6 C atoms; B) from 5 to 80 mol % of at least one hydroxyalkylester of an ethylenically unsaturated carboxylic acid having 3 to 6 C atoms; and C) up to 10 mol % of further monomers in an aqueous medium, thereby obtaining an aqueous solution of the polymer powder according to claim 1, and (II) free radical polymerizing a) from 80 to 100% by weight of at least one monomer selected from the group consisting of C2-C6 olefins, vinylaromatic compounds, esters of ethylenically unsaturated C3-C6 monocarboxylic acids or C4-C8 dicarboxylic acids with C1-C12 alkanols or C5-C10 cycloalkanols, vinyl esters of aliphatic C1-C20 carboxylic acids, (meth)allyl esters of aliphatic C1-C20 carboxylic acids and conjugated dienes, and b) from 0 to 20% by weight of at least one other monomer which has at least one ethylenically unsaturated group in the presence of the aqueous solution of the polymer powder according to claim 1, obtained in (I).
- 7. A modified building material comprising the polymer powder of claim 1.
- 8. The method according to claim 3, further comprising: adding water, thereby obtaining a mineral building material containing water.
Priority Claims (1)
Number |
Date |
Country |
Kind |
197 07 746 |
Feb 1997 |
DE |
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Parent Case Info
This application is a Divisional of U.S. Ser. No. 09/022,382, filed Feb. 12, 1998, now U.S. Pat. No. 6,133,345.
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