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US 8,025,767 B2Granted
Wet strength enhancers for paper
AssigneeBASF SE
InventorsEllen Krueger, Martin Wendker, Stefan Frenzel, Claus Boettcher
Life of this patent
Estimating the term…
Abstract
They are mixtures of (a) from 1 to 99.9% by weight of a water-soluble epihalohydrin-crosslinked polyamidoamine and (b) from 0.1 to 20% by weight of at least one other cationic polymer.
Claims7
A wet strength enhancer suitable for paper, comprising
- (a) from 1 to 99.9% by weight of an epihalohydrin-crosslinked polyamidoamine and
- (b) from 0.1 to 20% by weight of a cationic polyvinylamine having a molecular mass of 400,000 g/mol.
A process for producing paper which comprises adding to a paper stock a wet strength enhancer, which comprises
- (a) from 1 to 99.9% by weight of an epihalohydrin-crosslinked polyamidoamine and
- (b) from 0.1 to 20% by weight of a cationic polyvinylamine having a molecular mass of 400,000 g/mol;
- and
- draining the paper stock to produce paper.
1 more element
Dependencies are inferred from the claim text.