| 摘要 |
A water-soluble, crosslinkable protective colloid is provided having a weight-average molecular weight of least than 500,000 comprising: a) 20 to 95% by weight of monomer units containing sulphonic acid or sulphonate groups, b) 4 to 80% by weight of monomer units containing N-methylol or N-alkoxymethyl groups, and c) 0.1 to 20% by weight of hydrophobic monomer units such as water insoluble ethylenically unsaturated compounds and the hydrophobic end groups of initiator radicals or regulator molecules. Optionally, up to 50% by weight of the monomer units containing sulphonic acid or sulphonate groups can be replaced by monomer units containing carboxyl groups or monomer units containing amide groups.
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