Low viscosity mixtures of amphiphilic nonionic graft copolymers and viscosity-reducing additives

A low viscosity phase-stable mixture of

• (I) from 50 to 90% by weight of amphiphilic nonionic graft copolymers comprising, in copolymerized form,
• (a) at least 20% by weight of polyalkylene oxide units as hydrophilic part of the molecule and
• (b) at least 40% by weight of vinyl ester and/or acrylic ester units as hydrophobic part of the molecule,
• (II) from 5 to 48% by weight of at least one viscosity-reducing additive selected from the group consisting of alkoxylated alcohols having from 8 to 22 carbon atoms and alkoxylated amines, the molecular mass M.sub.N in each case being not more than 2500, and
• (III) from 2 to 20% by weight of water having a viscosity less than 5000 mPas at 60.degree. C. said weight percentages being based on the mixture.

A low viscosity mixture of

• (I) from 40 to 95% by weight of amphiphilic nonionic graft copolymers comprising, in copolymerized form,
• (a) at least 20% by weight of a polyalkylene oxide grafting base having a number average molecular weight of from 2,000 to 100,000 based on ethylene oxide, propylene oxide, butylene oxide or mixtures thereof as hydrophilic part of the molecule, and
• (b) at least 40% by weight of vinyl-formate, vinyl acetate, methyl acrylate, ethyl acrylate or methyl methacrylate as hydrophobic grafted part of the molecule, and
• (II) from 5 to 60% by weight of at least one viscosity-reducing additive comprising the reaction products of 1 mol of a monohydric C.sub.8 - to C.sub.22 -alcohol with from 2 to 70 mol of ethylene oxide and from 0 to 30 mol of propylene oxide, and
• (III) from 0 to 40% by weight of water as homogenizing or phase-stabilizing additive said weight percentages being based on the mixture.

A low viscosity mixture of

• (I) from 40 to 97.5% by weight of amphiphilic nonionic graft copolymers comprising, in copolymerized form,
• (a) at least 20% by weight of polyvinylpyrrolidone units as hydrophilic part of the molecule nd
• (b) at least 40% by weight of vinyl ester and/or (meth) acrylic ester units as hydrophobic part of the molecule, and
• (II) from 2.5 to 60% by weight of at least one viscosity-reducing additive selected from the group consisting of polyalkylene glycols, alkoxylated alcohols, alkoxylated alkylphenols, alkoxylated amines and hydroxy compounds having from 1 to 4 OH groups and from 2 to 10 carbon atoms, the molecular mass M.sub.N of the polymers in each case being not more than 2500, and
• (III) from 0 to 40% by weight of homogenizing or phase-stabilizing additives selected from the group consisting of
• (a) water,
• (b) monobasic and dibasic carboxylic acids having from 8 to 25 carbon atoms, fatty alcohol sulfates, fatty alcohol sulfonates, alkylbenzenesulfonates, sulfonation and/or sulfation products of alkoxylated alcohols having from 8 to 22 carbon atoms or alkylphenols, alkyl(poly) glucosides having from 1 to 20 carbon atoms in the alkyl group, mono-, oligo- and polysaccharides and the oxidation or reduction produce thereof, and
• (c) mixtures of (a) and (b) in a weight ratio of from 100:1 to 20:80,
• said weight percentages being based on the mixture.