Back to results
US 8,299,180 B2Granted
Glyoxalated N-vinylamine
AssigneeBASF SE
InventorMatthew D. Wright
Life of this patent
Estimating the term…
Abstract
The present invention is directed to compositions comprising a cellulose reactive functionalized polyvinylamine first adduct, compositions comprising combinations of the cellulose reactive functionalized polyvinylamine first adduct and cellulose reactive functionalized polyvinylamide second adduct, methods for preparing first adduct and second adduct blends and finally methods of increasing the wet or dry strength of paper by incorporation into the paper furnish or coating a paper or board with said adducts.
Claims13
A premixed blend comprising cellulose reactive first and second adducts:
- wherein said first adduct comprises
- a reaction product of a starting polyvinylamine with at least a dialdehyde,
- wherein the starting polyvinylamine is a polymer formed from N-vinylformamide or N-vinylacetamide,
- wherein the polymer is at least partially hydrolyzed to impart a degree of primary amino functionality, prior to the reaction with the dialdehyde;
- and
- the second adduct comprises a reaction product of a dialdehyde with a starting polyvinylamide,
- with the proviso that the first and second cellulose reactive adducts are different.
4 more elements
A blend of at least a first and a second adduct,
- wherein said first and second adducts are formed simultaneous by reacting a mixture of a starting polyvinylamine and a starting polyvinylamide with a dialdehyde,
- wherein the polyvinylamine is a polymer formed from N-vinylformamide or N-vinylacetamide, which polymer is at least partially hydrolyzed to impart a degree of primary amino functionality prior to the reaction with the dialdehyde, and
- the polyvinylamide is a polymer formed from an ethylenically unsaturated amide comprising (meth)acrylamide, N-alkyl (meth)acrylamide, or mixtures thereof.
Dependencies are inferred from the claim text.