Water-soluble copolymers based on olefinic sulfonic acids, method for the production thereof and use of the same
View Patent ↗Water-soluble copolymers based on olefinic sulfonic acids, olefinic dicarboxylic acids, vinyl amides and vinyl ethers and/or allyl ethers and/or bisacryl derivatives are described as well as processes for their production and the use of these copolymers as water retention agents, thickeners or anti-segregation agents for aqueous building material systems that contain hydraulic binding agents such as cement, lime, gypsum, anhydrite etc. or for clay suspensions preferably based on bentonite.
1. Water-soluble copolymers based on olefinic sulfonic acids, characterized in that they contain
a) 5 to 93 wt.-% structural units of formula (Ia) and/or (Ib)
in which
R 1 =hydrogen or C 1 –C 5 alkyl,
R 2 =C 1 –C 20 alkylene, carboxy-C 1 –C 20 -alkylene, carboamido-C 1 –C 20 -alkylene or phenylene
M=hydrogen, ammonium or a monovalent, divalent or trivalent metal cation
and
x=1 to 3
b) 1 to 50 wt.-% structural units of formula (IIa) and/or (IIb)
in which
R 3 and R 4 =—COO − (M x+ ) 1/x or are together
R 5 =—COO − (M x+ ) 1/x ,
M=hydrogen, ammonium or a monovalent, divalent or trivalent metal cation
and
x=1 to 3
c) 5 to 93 wt-% structural units of formula (III)
in which
R 6 =hydrogen or C 1 –C 5 alkyl
R 7 and R 8 =hydrogen or C 1 –C 10 alkyl or are together —(CH 2 ) y —, and
y=3 to 7
d) 1 to 25 wt.-% structural units of formula (IVa) and/or (IVb) and/or (IVc)
in which
R 9 hydrogen or C 1 –C 5 alkyl
R 10 =C 1 –C 10 alkyl, C 1 –C 10 aminoalkyl, C 1 –C 20 hydroxyalkyl, C 1 –C 4 alkyl or hydroxyl-terminated mono- or poly-C 2 –C 3 -alkyleneoxy (containing 1 to 400 alkyleneoxy units), C 7 –C 20 alkylaryl, C 7 –C 20 hydroxyalkylaryl, C 6 –C 10 aryl, C 6 –C 10 hydroxyaryl
R 11 , R 12 and R 13 =hydrogen or C 1 –C 5 alkyl, and
R 14 =hydrogen, C 1 –C 20 alkyl, C 1 –C 10 aminoalkyl, C 1 –C 20 hydroxyalkyl, C 1 –C 4 alkyl or hydroxyl-terminated mono- or poly-C 2 –C 3 -alkyleneoxy (containing 1 to 400 alkyleneoxy units), C 7 –C 20 alkylaryl, C 7 –C 20 hydroxyalkylaryl, C 6 –C 10 aryl, C 6 –C 10 hydroxyaryl or C 1 –C 20 alkylenesulfonic acids optionally substituted with hydroxyl group(s) and ammonium, alkali or alkaline earth salts thereof
R 16 =H, CH 3
X=O, NH
n=1 to 6
r, s=0 to 5
t=1 or 2
u=1 to 50
and
R 6 has the above-mentioned meaning
and that the components a) to d) add up to 100 wt.-%.
2. Copolymers as claimed in claim 1 , characterized in that R 1 =hydrogen and R 2 =—CO—NH—C(CH 3 ) 2 —CH 2 — in formula (Ia).
3. Copolymers as claimed in claim 1 , wherein in formulae (Ia), (Ib), (IIa) and (IIIb) the monovalent metal cations denote alkali ions and in particular sodium and potassium ions, the divalent metal cations denote alkaline earth ions and in particular calcium and magnesium ions and the trivalent metal cations denote aluminum or iron ions.
4. Copolymers as claimed in claim 1 , wherein y=3 to 5 in formula (III).
5. Copolymers as claimed in claim 1 , wherein in formulae (IVa) and/or (IVb) the C 1 –C 20 hydroxyalkyl, C 7 –C 20 hydroxy-alkylaryl, C 6 –C 10 hydroxylaryl residues for R 10 and R 14 have one or more hydroxyl groups.
6. Copolymers as claimed in claim 1 , wherein, in formula (IVa) R 9 denotes hydrogen and R 10 denotes a C 1 –C 6 hydroxyalkyl or a methyl-terminated or hydroxyl-terminated mono- or poly-C 2 –C 3 -alkyleneoxy residue.
7. Copolymers as claimed in claim 1 , wherein, in formula (IVb), R 11 , R 12 and R 13 denote hydrogen and R 14 denotes 2,3-dihydroxypropyl, 3-hydroxypropyl or 2-hydroxypropyl-3-sulfonic acid as well as ammonium, alkali and alkaline earth salts thereof.
8. Copolymers as claimed in claim 1 , comprising 40 to 83 wt.-% structural units a), 5 to 48 wt.-% structural units b), 5 to 53 wt.-% structural units c) and 1 to 10 wt.-% structural units d).
9. Copolymers as claimed in claim 1 , they have having a molecular weight of 10,000 to 3,000,000 g/mol.
10. Copolymers as claimed in claim 9 , characterized in that the molecular weight is between 100,000 g/mol and 1,000,000 g/mol.
11. Process for producing the copolymers as claimed in claim 1 , wherein monomers of formula (Ia) and/or (Ib)
in which
R 1 =hydrogen or C 1 –C 5 alkyl,
R 2 =C 1 –C 20 alkylene, carboxy-C 1 –C 20 -alkylene, carboamido-C 1 –C 20 -alkylene or phenylene
M=hydrogen, ammonium or a monovalent, divalent or trivalent metal cation and
x=1 to 3,
and of formula (IIa) and/or (IIb)
in which
R 3 and R 4 =—COO − (M x+ ) 1/x or are together
R 5 =—COO − (M x+ ) 1/x
M=hydrogen, ammonium or a monovalent, divalent or trivalent metal cation and
x=1 to 3,
and
of formula (III)
in which
R 6 =hydrogen or C 1 –C 5 alkyl
R 7 and R 8 =hydrogen or C 1 –C 10 alkyl or are together —(CH 2 ) y —
and
y=3 to 7,
and
of formula (IVa) and/or (IVb) and/or (IVc),
in which
R 9 =hydrogen or C 1 –C 5 alkyl
R 10 =C 1 –C 10 alkyl, C 1 –C 10 aminoalkyl, C 1 –C 20 hydroxyalkyl, C 1 –C 4 alkyl or hydroxyl-terminated mono- or poly-C 2 –C 3 -alkyleneoxy (containing 1 to 400 alkyleneoxy units), C 7 –C 20 alkylaryl, C 7 –C 20 hydroxyalkylaryl, C 6 –C 10 aryl, C 6 –C 10 hydroxyaryl
R 11 , R 12 and R 13 =hydrogen or C 1 –C 5 alkyl and
R 14 =hydrogen, C 1 –C 20 alkyl, C 1 –C 10 aminoalkyl, C 1 –C 20 hydroxyalkyl, C 1 –C 4 alkyl or hydroxyl-terminated mono- or poly-C 2 –C 3 -alkyleneoxy (containing 1 to 400 alkyleneoxy units), C 7 –C 20 alkylaryl, C 7 –C 20 hydroxyalkylaryl, C 6 –C 10 aryl, C 6 –C 10 hydroxyaryl or C 1 –C 20 alkylenesulfonic acids optionally substituted with hydroxyl group(s) and ammonium, alkali or alkaline earth salts thereof
R 16 =H, CH 3
X=O, NH
n=1 to 6
r, s=0 to 5
t=1 or 2
u=1 to 50
and
R 6 has the above-mentioned meaning,
are polymerized in bulk or in solution at temperatures of −5 to 120° C.
12. Process as claimed in claim 11 , characterized in that an inverse emulsion polymerization is carried out in an organic solvent selected from the group comprising cyclohexane, toluene, heptane, benzene, petroleum ether or mineral oils in the presence of a protective colloid.
13. Process as claimed in claim 11 , characterized in that a suspension polymerization is carried out in a continuous organic phase with the aid of a water-soluble initiator system.
14. Process as claimed in claim 11 , characterized in that a precipitation polymerization is carried out using a water-soluble C 1 –C 5 alcanol as a solvent.
15. Process as claimed in claim 11 , wherein a gel polymerization is carried out in which the amount of monomer in an aqueous solution is 25 to 75% by weight.
16. Water retention agents for aqueous building material systems containing mineral binders, or for clay suspensions, comprising copolymers of claim 1 .
17. The water retention agents of claim 16 , comprising copolymers in an amount of 0.05 to 5% by weight based on the dry weight of the building material system.
18. Anti-segregation agents for aqueous building material systems containing mineral binders, or for clay suspensions, comprising copolymers of claim 1 .
19. The anti-segregation agents of claim 18 , comprising copolymers in an amount of 0.05 to 5% by weight based on the dry weight of the building material system.
20. A thickener for aqueous building material systems containing mineral binders, or for clay suspensions, comprising copolymers of claim 1 .
21. The thickener of claim 20 , comprising copolymers in an amount of 0.05 to 5% by weight based on the dry weight of the building material system.