Anionic additives soluble in water and in solvents
View Patent ↗The invention relates to anionically modified copolymers that can be obtained by the polymerization of monomers (A), (B), (C) and (D) in order to obtain non-ionic copolymers comprising reactive terminal OH groups, and subsequent reaction of the terminal OH groups to form anionic end groups, where A) is a monomer of formula (I) wherein A is C2-C4 alkylene and B is a C2-C4 alkylene different from A, and R is hydrogen or methyl; (B) is a monomer of formula (II) wherein D is C3 alkylene, R is hydrogen or methyl, and o is a number between 2 and 500; (C) is an ethylenically unsaturated monomer containing an aromatic group; and (D) is an ethylenically unsaturated monomer containing an alkyl radical.
1. An anionically modified copolymer obtained by polymerization of monomers (A), (B), (C) and (D) to obtain nonionic copolymers having reactive terminal OH groups, and subsequent conversion of the terminal OH groups to anionic end groups, wherein
(A) is a monomer of formula (I)
wherein
A is C 2 -C 4 -alkylene,
B is a C 2 -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;
(B) is a monomer of formula (II)
where
D is C 3 -alkylene,
R is hydrogen or methyl,
o is from 2 to 500;
(C) is an ethylenically unsaturated monomer containing an aromatic group; and
(D) is an ethylenically unsaturated monomer containing an alkyl radical, wherein the copolymer is of the formulae (V) or (VI)
wherein
A is C 2 -C 4 -alkylene,
B is a C 2 -C 4 -alkylene other than A,
D is a C 3 -alkylene,
m is from 1 to 500;
n is from 1 to 500;
and the sum total of m+n is from 2 to 1000;
o is from 2 to 500;
X a is an aromatic or araliphatic radical having 3 to 30 carbon atoms optionally containing heteroatoms selected from the group consisting of N, O and S,
Z a is H or (C 1 -C 4 )-alkyl,
Z b is H or (C 1 -C 4 )-alkyl,
Z c is H or (C 1 -C 4 )-alkyl;
R is hydrogen or methyl,
R 1 is hydrogen or methyl,
R 2 is hydrogen or methyl,
Y is an aliphatic hydrocarbon radical having 1 to 30 carbon atoms, optionally linear or branched or cyclic, and optionally contains heteroatoms selected from the group consisting of O, N and S and is optionally unsaturated,
W b is oxygen or an NH group;
X b is an aromatic or araliphatic radical having 3 to 30 carbon atoms optionally containing heteroatoms selected from the group consisting of O, N and S,
W a is oxygen or an NH group,
Q is SO 3 , CH 2 COO, PO 3 M or sulfosuccinate, and
M is H, a metal cation, an ammonium, an alkylated ammonium ion, or a combination thereof;
a=0.001-0.9
b=0.001-0.9
c=0.001-0.9
d=0.001-0.9
subject to the proviso that the sum total of a+b+c+d is equal to 1.
2. The copolymer as claimed in claim 1 , wherein the molar fraction of monomer (A) is 0.1 to 90%, of monomer (B) is 0.1 to 90%, of monomer (C) is 0.1 to 90% and of monomer (D) is 0.1 to 90%, the molar fractions summing to 100%.
3. The copolymer as claimed in claim 1 , wherein A is ethylene and B is propylene, or A is propylene and B is ethylene.
4. The copolymer as claimed in claim 1 , wherein the alkylene oxide units A-O) m and (B—O) n are in blocks.
5. The copolymer as claimed in claim 1 , wherein the monomer (C) is a compound of formula (IIIa) or (IIIb)
wherein
X a is an aromatic or araliphatic radical having 3 to 30 carbon atoms optionally containing heteroatoms selected from the group consisting of N, O and 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 heteroatoms selected from the group consisting of N, O and S,
W a is oxygen or an NH group.
6. The copolymer as claimed in claim 1 , wherein the monomer (D) is a compound of formula (IV):
wherein
R 2 is hydrogen or methyl,
Y is an aliphatic hydrocarbyl radical having 1 to 30 carbon atoms, optionally linear or branched or cyclic, and optionally contains heteroatoms selected from the group consisting of O, N and S and is optionally unsaturated,
W b is oxygen or an NH group.
7. The copolymer as claimed in claim 1 , wherein the anionic end groups are selected from the group consisting of SO 3 M, CH 2 COOM, PO 3 M 2 and sulfosuccinate, wherein M represents H, a metal cation, NH 4 + , an alkylated ammonium ion or a combination thereof.
8. A process for producing a copolymer as claimed in claim 1 , comprising the steps of free-radically polymerizing the monomers (A), (B), (C) and (D) and converting the resulting terminal OH groups to anionic end groups.
9. A dispersant comprising a copolymer as claimed in claim 1 .
10. The dispersant as claimed in claim 9 , wherein the dispersant is a pigment dispersant or a filler dispersant.