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US 4,966,652 AGranted
Increasing the stiffness of paper
AssigneeAmerican Cyanamid Company
InventorRichard B. Wasser
Life of this patent
Estimating the term…
Abstract
The stiffness of paper is enhanced by the addition thereto of a composition consisting essentially of an acrylamide polymer and glyoxal with or without starch.
Claims12
A method of stiffening paper which comprises (A) adding to paper at the size press end of a paper-making machine, with or without starch, an effective amount of a composition consisting essentially of an aqueous solution of:
- (1) a water-soluble polymer of acrylamide and (2) glyoxal the ratio of (1):(2) ranging from about 90:10 to about 25:75, respectively, (B) drying the resultant paper and (C) recovering the resultant stiffened paper sheet.
Dependencies are inferred from the claim text.