Dispersion Powders Containing Fatty Acid Anhydrides

1 .- 11 . (canceled)

12 . A composition of matter comprising a water-redispersible polymer powder composition comprising from 0.1 to 70% by weight of one or more fatty acid anhydrides, based on the total weight of the water-redispersible polymer powder composition.

13 . The composition of matter of claim 12 , wherein the water-redispersible polymer powder composition comprises one or more fatty acid anhydrides of branched or unbranched, saturated or unsaturated fatty acids having from 8 to 22 carbon atoms.

14 . The composition of matter of claim 13 , wherein the water-redispersible polymer powder composition comprises unsymmetrical fatty acid anhydrides.

15 . The composition of matter of claim 14 , wherein the water-redispersible polymer powder composition comprises unsymmetrical fatty acid anhydrides of fatty acids having from 8 to 22 carbon atoms and carboxylic acids having from 2 to 6 carbon atoms.

16 . The composition of matter of claim 12 , wherein the water-redispersible polymer powder composition comprises symmetrical fatty acid anhydrides of saturated or unsaturated fatty acids having from 10 to 18 carbon atoms.

17 . The composition of matter of claim 12 , wherein the water-redispersible polymer powder composition comprises

a) from 60 to 99.9% by weight of one or more water-insoluble, film-forming base polymers based on homopolymers or copolymers of one or more monomers comprising vinyl esters of unbranched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylic esters and acrylic esters of alcohols having from 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and vinyl halides,

b) from 0.1 to 30% by weight of one or more fatty acid anhydrides and

c) from 0 to 30% by weight of one or more protective colloids, the percentages by weight based on the total weight of the water-redispersible polymer powder composition.

18 . The composition of matter of claim 12 , wherein the water-redispersible polymer powder composition comprises:

a) from 5 to 70% by weight of one or more fatty acid anhydrides and

b) from 30 to 95% by weight of one or more protective colloids,

the weight percentages based on the total weight of the polymer powder composition.

19 . A process for producing a composition of matter comprising a water-redispersible polymer powder composition of claim 12 , comprising (1) drying a mixture comprising an aqueous dispersion of a polymer a) and a fatty acid anhydride b), or (2) drying only fatty acid anhydride b), in the first case (1), optionally in the presence of a protective colloid c), and in the second case (2), in the presence of a protective colloid c).

20 . The composition of matter of claim 12 , further comprising at least one hydraulically setting binder.

21 . In a building adhesive, tile adhesive, thermal insulation adhesive, plaster or render, scim coat, knifing filler, flooring composition, self-leveling screed, sealing slurry, jointing mortar, paint, gunned mortar or gunned concrete, containing a polymer powder and at least one hydraulic setting inorganic binder, the improvement comprising substituting the water-redispersible polymer powder composition of matter of claim 12 for all or part of the redispersible polymer powder.

22 . A process for hydrophobicizing sand, clay, paper, textile, natural or synthetic fibres, comprising applying a hydrophobicizing amount of the composition of matter of claim 12 .

23 . A process for hydrophobicizing sand, clay, paper, textile, natural or synthetic fibres, comprising applying a hydrophobicizing amount of the composition of matter of claim 18 .

24 . A chemical building construction composition, comprising

a) at least one hydraulically setting inorganic binder,

b) at least one redispersible polymer powder, and

c) the water-redispersible polymer powder of claim 18 .