Back to results
US 7,745,525 B2Granted
Waterfast dye fixative compositions for ink jet recording sheets
AssigneeInternational Paper Company
InventorMichael F Koenig
Life of this patent
Estimating the term…
Abstract
A coating composition comprising a blend of at least two dye fixatives, at least one of which is a cationic polymer, and at least one of the other dye fixatives is a polyvalent metal salt, to form a water-insoluble complex. The ink recording sheets comprise a composition that is absorbed into the surface of the substrate as a sizing material, or alternatively, forms a continuous layer on the substrate. The present invention also encompasses methods for making the ink jet recording sheets.
Claims20
A method for making an ink jet recording sheet, comprising:
- preparing, under acidic conditions, a composition comprising a water-soluble blend of at least two dye fixatives, wherein at least one of said dye fixatives is a cationic polymer and the other of said dye fixatives is a polyvalent metal salt;
- contacting said composition with a base to raise the pH of said composition and form a water-insoluble complex from said blend;
- contacting said water-insoluble complex with a starch, to form a sizing composition;
- and
- coating at least one surface of a substrate with the sizing composition.
2 more elements
Dependencies are inferred from the claim text.