Linear precipitated polymer

Abstract

The present invention relates to precipitation polymers obtainable by polymerization of a monomer mixture which comprises a) 30 to 99% by weight of at least one nonionic water-soluble monomer and b) at least one monomer that is different from a) and is selected from i) monomers carrying at least one hydroxyl group, ii) anionic monomers and iii) mixtures of i) and ii), and c), if appropriate, a monomer carrying at least one amino group or, if appropriate, further monomers, wherein the total amount of a), b), c) and d) is 100% by weight and the monomer mixture, based on the total amount of a), b), c) and d), comprises less than 0.1% by weight of a monomer with at least two free-radically polymerizable double bonds per molecule. The invention furthermore relates to the use of these polymers as rheology modifiers for aqueous compositions, to aqueous compositions comprising these polymers and to the use of the polymers for thickening cosmetic and pharmaceutical preparations.

Description

[0001] This application is a divisional application of Chinese patent application 200980107297.9. The filing date of this Chinese patent application is January 28, 2009, and the title of the invention is "linear precipitation polymer". field of invention [0002] The invention relates to a precipitation polymer obtainable by polymerization of a monomer mixture containing: 30-99% by weight of at least one nonionic, water-soluble monomer a); at least one different from a) and selected from i) monomers bearing at least one hydroxyl group, ii) anionic monomers and iii) monomers in mixtures of i) and ii); optionally, monomers c) bearing at least one amino group; any Optionally, other monomers, wherein the total amount of a), b), c) and d) is 100% by weight, and wherein the monomer mixture contains less than 0.1% by weight of monomers having at least two free-radically polymerizable double bonds per molecule. The invention also relates to the use of these polymers as rheology modif...

AI Technical Summary

Problems solved by technology

However, the use of known thickeners often has disadvantages, depending on the field of application of the formulation to be thickened

Thus, the thickening action of the thickener may be unsatisfactory, its use may be unnecessary, or it may be difficult or impossible to introduce into the preparation to be thickened, for example because of its interaction with the compound to be thickened. incompatibility between

Another disadvantage that is usually caused when using polymers as thickeners for the production of higher viscosity or gel-like formulations is that the molecular weight of the polymer increases so that its incorporation becomes generally more difficult and in the end usually only observation to the swelling of the polymer, rather than the desired dissolution

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