Water-soluble or water-swellable crosslinked copolymers
View Patent ↗Water-soluble or water-swellable crosslinked copolymers consisting essentially of structural units of the formula 1 or a mixture of the structural units of the formula 1 with structural units of the formula 2 and structural units of the formula 3 where R, R 1 , R 2 , R 3 , Z and n are as defined in the description. These copolymers are crosslinked with compounds which contain at least two olefinic double bonds. These crosslinked copolymers are suitable as thickeners, in particular for cosmetic and pharmaceutical preparations.
1. A water-soluble or water-swellable crosslinked copolymer consisting essentially of
a1) 1 to 50% by weight of a repeating structural unit of formula (1)
where n is an integer from 2 to 9,
or
a2) 1 to 50% by weight of a mixture of the repeating structural unit of the formula (1) and a repeating structural unit of formula (2)
where R, R 1 and R 2 may be identical or different and are hydrogen or a linear or branched alkyl or alkenyl group having in each case 1 to 30 carbon atoms and
b) 49.99 to 98.99% by weight of a repeating structural unit of formula (3)
in which R 3 is hydrogen, methyl or ethyl, Z is C 1 -C 8 -alkylene, and X is an ammonium ion, and
c) 0.01 to 8% by weight of crosslinking structures resulting from a monomer having at least two olefinic double bonds.
2. The copolymer as claimed in claim 1 , consisting essentially of 2 to 30% by weight of component a1) or mixture a2), 69.5 to 97.5% by weight of component b) and 0.2 to 3% by weight of component c).
3. The copolymer as claimed in claim 1 , consisting essentially of 3 to 15% by weight of component a1) or mixture a2), 84.5 to 96.5% by weight of component b) and 0.5 to 2% by weight of component c).
4. The copolymer as claimed in claim 1 , wherein the monomer of component c) is allyl (meth)acrylate.
5. A cosmetic preparation or a pharmaceutical preparation comprising the water-soluble or water-swellable crosslinked copolymer of claim 1 .
6. The water-soluble or water-swellable crosslinked copolymer of claim 1 wherein R, R 1 and R 2 are a linear or branched alkyl or alkenyl group having in each case 1 to 20 carbon atoms.
7. The water-soluble or water-swellable crosslinked copolymer of claim 1 wherein R, R 1 and R 2 are a linear or branched alkyl or alkenyl group having in each case 1 to 12 carbon atoms.
8. A water-soluble or water-swellable crosslinked copolymer consisting essentially of
a) 1 to 50% by weight of a repeating structural unit of the formula (1)
where n is an integer from 2 to 9,
b) 49.99 to 98.99% by weight of a repeating structural unit of the formula (3)
in which R 3 is hydrogen, methyl or ethyl, Z is C 1 -C 8 -alkylene, and X is an ammonium ion, and
c) 0.01 to 8% by weight of crosslinking structures resulting from monomers having at least two olefinic double bonds.
9. The water-soluble or water-swellable crosslinked copolymer of claim 1 , wherein in component c) the monomer is selected from the group consisting of allyl acrylate, allyl methacrylate, allyl ethyl methacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, dipropylene glycol diallyl ether, polyglycol diallyl ether, triethylene glycol divinyl ether, hydroquinone diallyl ether, tetraallyloxyethane, tetraethylene glycol diacrylate, triallylamine, trimethylolpropane diallyl ether, methylene bisacrylamide, divinylbenzene, and mixtures thereof.
10. The water-soluble or water-swellable crosslinked copolymer of claim 8 , wherein in component c) the monomers are selected from the group consisting of allyl acrylate, allyl methacrylate, allyl ethyl methacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, dipropylene glycol diallyl ether, polyglycol diallyl ether, triethylene glycol divinyl ether, hydroquinone diallyl ether, tetraallyloxyethane, tetraethylene glycol diacrylate, triallylamine, trimethylolpropane diallyl ether, methylene bisacrylamide, divinylbenzene, and mixtures thereof.