Back to results
US 6,281,291 B1Granted
Paper or board treating composition of carboxylated surface size, polyacrylamide and crosslinker
AssigneeBayer Aktiengesellschaft
InventorsRajiv Bazaj, Gerald Guerro, David Dauplaise
Life of this patent
Estimating the term…
Abstract
A composition useful in paper and board making comprises a carboxylated surface size containing at least 40 mole percent of hydrophobic groups and at least about 25 mole percent of carboxylated groups such as styrene-(meth)acrylic aicd copolymers or styrene-maleic acid (anhydride or salt) copolymers, a hydrophilic polyacrylamide and a crosslinking agent such as glyoxylated vinylamide polymers, formaldehyde, melamine-formaldehyde condensates and glyoxyl-extended materials.
Claims20
A composition consisting essentially of a mixture of:
- (i) a synthetic, carboxylated surface size containing at least about 40 mole percent hydrophobic groups and at least about 25 mole percent of carboxylatd groups selected from the group consisting of hydrolyzed styrene-maleic anhydride copolymers, styrene-maleic acid salt copolymers, styrene-(meth)acrylate copolymers, styrene-(meth)acrylic acid copolymers, and acrylonitrile-(meth)acrylate salt copolymers;
- (ii) a substantially hydrophilic polyacrylamide, wherein the ratio of said surface size to said polyacrylamide is from about 30-95 parts by weight surface size to about 70-5 parts by weight polyacrylamide;
- and
- (iii) a crosslinking agent.
1 more element
Dependencies are inferred from the claim text.