Claims
- 1. A process for the preparation of a water-soluble polymer having a K value of from 5 to 100 (determined on the Na salt of the polymer according to H. Fikentscher in aqueous solution at 25.degree. C, a pH of 7 and a concentration of 1% by weight of the Na salt of the polymer) by polymerizing a monomer mixture of
- (a) monoethylenically unsaturated C.sub.3 -C.sub.6 -monocarboxylic acids and
- (b) monomers which contain two or more ethylenically unsaturated double bonds linked via one or more ester or amide functions and which possess one or more --CO--OX groups, where X is one hydrogen equivalent, one alkali metal equivalent or one alkaline earth metal equivalent or an ammonium group,
- in aqueous solution in the presence of a polymerization initiator at not more than 200.degree. C., wherein a monomer mixture which contains more than 20-100 mol % of (b) is polymerized in the presence of not more than 50% by weight, based on the monomers used, of a polymerization initiator.
- 2. A process as claimed in claim 1, wherein the monomer mixture polymerized additionally contains monomers selected from the group consisting of
- (c) from to 79.9 mol % of monoethylenically unsaturated C.sub.4 -C.sub.6 -dicarboxylic acids,
- (d) from 0 to 20 mol % of hydroxyalkyl esters, where the hydroxyalkyl group is of 2 to 6 carbon atoms, of monoethylenically unsaturated C.sub.3 -C.sub.6 -carboxylic acids,
- (e) from 0 to 30 mol % of other water-soluble, monoethylenically unsaturated monomers copolymerizable with monomers of groups (a) to (d), and
- (f) from 0 to 10 mol % of monomers which have two or more ethylenically unsaturated nonconjugated double bonds and differ from the monomers (b),
- the sum of the mol % for (a) to (f) always being 100 and one or more of the components (c) to (f) being present in the monomer mixture in an amount of 0.1 mol %.
- 3. A process as claimed in claim 1 or 2, wherein a monomer mixture of
- a) from 79.9 to 10 mol % of acrylic acid and/or methacrylic acid,
- b) from 20.1 to 90 mol % of a compound of the formula
- XOOC--CH.dbd.CH.dbd.CO--O--(CH.sub.2 --CH.sub.2 --O).sub.n --CO--CH.dbd.CH--COOX (I)
- where X is H, an alkali metal or an ammonium group and n is from 1 to 120, and
- c) from 0 to 69.9 mol % of maleic acid are preferably polymerized in the presence of not more than 30% by weight, based on the monomers used, of a polymerization initiator.
- 4. A process as claimed in claim 1 or 2, wherein a monomer mixture of
- a) from 79.9 to 10 mol % of acrylic acid and/or methacrylic acid,
- from 20.1 to 90 mol % of a compound of the formula
- XOOC--CH.dbd.CH--CO--NH--CH.sub.2 --(CH.sub.2).sub.n --CH.sub.2 --NH--CO--CH.dbd.CH--COOX (II)
- where X is H, an alkali metal or an ammonium group and n is from 0 to 4, and
- c) from 0 to 69.9 mol % of maleic acid
- is polymerized in the presence of not more than 30% by weight, based on the monomers used, of a polymerization initiator.
Priority Claims (1)
Number |
Date |
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3818426 |
May 1988 |
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Parent Case Info
This application is a continuation of application Ser. No. 07/359,264, filed May 31, 1989, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
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3514364 |
Jun 1987 |
DEX |
Continuations (1)
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Number |
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359264 |
May 1989 |
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