Non-anionic water-soluble additives
View Patent ↗The invention relates to a copolymer that can be obtained by the polymerisation of monomers (A), (B) and (C), (A) being a monomer of formula (I), in which A represents a C 2 to C 4 alkene and B represents a C 2 to C 4 alkene that is different from A, R represents hydrogen or methyl, m is a number between 1 and 500, n is a number between 1 and 500, (B) is an ethylenically unsaturated monomer containing an aromatic group and (C) is an ethylenically unsaturated monomer containing an alkyl radical. The claimed copolymers are suitable for use as dispersants for pigments.
1. A copolymer obtained by polymerizing monomers (A), (B) and (C), wherein
(A) is a monomer of formula (I)
wherein
A is C 2 - to C 4 -alkylene,
B is a C 2 - to C 4 -alkylene other than A,
R is hydrogen or methyl,
m is from 1 to 500;
n is from 1 to 500,
and the sum total of m+n is from 2 to 1000;
wherein the monomer (B) is a compound of formula (IIa) or (IIb):
wherein
X a is an aromatic or araliphatic radical having 3 to 30 carbon atoms, optionally containing one or more of the hetero atoms N, O or S,
Z a is H or (C 1 -C 4 )-alkyl,
Z b is H or (C 1 -C 4 )-alkyl, and
Z c is H or (C 1 -C 4 )-alkyl;
wherein
R 1 is hydrogen or methyl,
X b is an aromatic or araliphatic radical having 3 to 30 carbon atoms, optionally containing one or more of the hetero atoms N, O or S,
W a is oxygen or an NH group; and
wherein
the monomer (C) is a compound of formula (III):
wherein
R 2 is hydrogen or methyl,
Y is an aliphatic hydrocarbyl radical having 1 to 30 carbon atoms, which is linear or branched or cyclic, and optionally contains hetero atoms O, N, S or a combination thereof and may also be unsaturated,
W b is oxygen or an NH group.
2. The copolymer as claimed in claim 1 , wherein the molar fraction of monomer (A) is 1 to 80%, monomer (B) is 0.1 to 80% and monomer (C) is 0.1 to 80%.
3. The copolymer as claimed in claim 1 , wherein the molar fraction of monomer (A) is 10 to 70%, monomer (B) is 10 to 60% and monomer (C) is 10 to 60%.
4. The copolymer as claimed in claim 1 , wherein the alkylene oxide units (A-O) m and (B-O) n blocks a blocklike arrangement.
5. The copolymer as claimed in claim 1 , wherein (A-O) m is propylene oxide units and (B-O) n is ethylene oxide units, or (A-O) m is ethylene oxide units and (B-O) n is propylene oxide units, and the molar fraction of ethylene oxide units is 50 to 98%, based on the sum total of ethylene oxide and propylene oxide units.
6. The copolymer as claimed in claim 5 , wherein the molar fraction of ethylene oxide units is 60 to 95%, based on the sum total of ethylene oxide and propylene oxide units.
7. The copolymer as claimed in claim 1 , wherein the monomer (B) is styrene, 1-vinylimidazole, benzyl methacrylate, 2-phenoxyethyl methacrylate or phenethyl methacrylate.
8. The copolymer as claimed in claim 1 , wherein the monomer (C) is an alkyl ester or alkylamide of acrylic acid or methacrylic acid, wherein the alkyl is methyl, ethyl, propyl, butyl, isobutyl, 2-ethylhexyl, 2-ethoxyethyl, myristyl, lauryl or octadecyl.
9. A process for producing a copolymer as claimed in claim 1 , comprising the step of free-radically polymerizing the monomers (A), (B) and (C).
10. A dispersant comprising a copolymer as claimed in claim 1 .
11. The copolymer as claimed in claim 1 , wherein Y is an aliphatic hydrocarbyl radical having 6 to 30 carbon atoms.
12. The copolymer as claimed in claim 1 , wherein Y is an aliphatic hydrocarbyl radical having 9 to 20 carbon atoms.
13. The dispersant as claimed in claim 10 , wherein the dispersant is a dispersant for pigments or fillers.
14. The copolymer as claimed in claim 1 , wherein Y is an aliphatic hydrocarbyl radical having 6 to 30 carbon atoms, which is linear or branched or cyclic, and optionally contains hetero atoms O, N, S or a combination thereof and may also be unsaturated.
15. The copolymer as claimed in claim 1 , wherein Y is an aliphatic hydrocarbyl radical having 9 to 20 carbon atoms, which is linear or branched or cyclic, and optionally contains hetero atoms O, N, S or a combination thereof and may also be unsaturated.