Method for strengthening cellulosic substrates
AssigneeRohm and Haas Company
InventorsCharles T. Arkens, Scott L. Egolf, Robert D. Gleim, Oscar H. Hsu, Kenneth J. Wiesinger
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Abstract
This invention relates to a method for strengthening a cellulosic substrate by treating the substrate with a formaldehyde-free curable aqueous composition and curing the composition. The cellulosic substrates include, for example, paper oil- and air-filter stock, rayon nonwoven wipes, cellulosic laminating stock, cotton woven fabrics, and wood flakes suitable to be consolidated into flakeboard.
Claims7
A method for increasing the delamination resistance of laminating stock or a laminate comprising multiple plies of said laminating stock comprising contacting said laminating stock with a formaldehyde-free curable aqueous composition comprising (a) a polyacid containing at least two carboxylic acid groups, anhydride groups, or the salts thereof;
- and (b) a phosphorous-containing accelerator, wherein said carboxyl groups, anhydride groups, or salts thereof are neutralized to an extent of less than about 35% with a fixed base;
- and heating said composition.
A method for improving the water resistance of a consolidated wood product comprising contacting said wood product components, prior to consolidation, with a formaldehyde-free curable aqueous composition comprising (a) a polyacid containing at least two carboxylic acid groups, anhydride groups, or the salts thereof;
- and (b) a phosphorous-containing accelerator, wherein said carboxyl groups, anhydride groups, or salts thereof are neutralized to an extent of less than about 35% with a fixed base;
- and heating said composition.
Dependencies are inferred from the claim text.