Patent ID: 8741968

Claim:
A process for the protection of cellulose-comprising materials from infection by microorganisms comprising the treatment of the cellulose-comprising material with an aqueous active substance composition, comprising a) at least one fungicidal organic active substance with a solubility in water of less than 1 g/l at 25° C./1013 mbar, and b) a finely-divided polymer with an average particle size, determined by dynamic light scattering, of 10 to 250 nm, in which the polymer particles comprise the active substance, the polymer having a glass transition temperature of at least 10° C. and being formed from ethylenically unsaturated monomers M consisting of: from 70 to 99.5% by weight, based on the total amount of the monomers M, of at least one neutral monoethylenically unsaturated monomer M1 with a solubility in water of not more than 30 g/l at 25° C., which is selected from styrene and esters of monoethylenically unsaturated mono- or dicarboxylic acids with C 1 -C 10 -alkanols or C 5 -C 8 -cycloalkanols, and from 0.50 to 30% by weight, based on the total amount of the monomers M, of at least one ethylenically unsaturated monomers M2, which is selected from: monoethylenically unsaturated monomers M2a exhibiting at least one acid group or at least one anionic group, the amount of monomers M2a being not more than 20% by weight, based on the total amount of the monomers M; monoethylenically unsaturated neutral monomers M2b exhibiting a solubility in water of at least 50 g/l at 25° C., the amount of monomers M2b being not more than 10% by weight, based on the total amount of the monomers M; and monoethylenically unsaturated monomers M2c exhibiting at least one cationic group and/or at least one group which can be protonated in the aqueous medium, the amount of monomers M2c being not more than 20% by weight, based on the total amount of the monomers M; and not more than 2% by weight, based on the total amount of the monomers M, of monomers having two or more nonconjugated ethylenically unsaturated double bonds, wherein the aqueous active substance composition is obtained by a process comprising radical aqueous emulsion polymerization of an oil-in-water emulsion of the monomers M, the monomer droplets of the oil-in-water emulsion to be polymerized comprising the fungicidal active substance in dissolved form, and wherein at least one monomer M2c is present in the polymer, wherein the monomer M2c, is selected from monomers of the general formula (I) in which R 1 is hydrogen or C 1 -C 4 -alkyl R 2 and R 3 are, independently of one another, C 1 -C 4 -alkyl, and R 4 is hydrogen or C 1 -C 4 -alkyl, Y is oxygen, NH or NR 4 with R 4 being C 1 -C 4 -alkyl A is C 2 -C 8 -alkylene, optionally interrupted by 1, 2 or 3 nonadjacent oxygen atoms, and X − is an anion equivalent, and, for R 4 ═H, the free bases of the monomers of the formula (I).