| US 7,488,403 B2 | ||
| Blends of glyoxalated polyacrylamides and paper strengthening agents | ||
| Cornel Hagiopol, 1176 Mandalay Ct., Lilburn, Ga. 30047 (US); Yuping Luo, 430 Arborshade Trace, Duluth, Ga. 30097 (US); David F. Townsend, 1475 Roanoke Trace, Grayson, Ga. 30017 (US); James W. Johnston, 2572 Collins Port Cove, Suwanee, Ga. 30024 (US); Clay E. Ringold, 145 Michigan Ave., Decatur, Ga. 30030 (US); and Karla D. Favors, 3323 Cedar Island Dr., Sw, Atlanta, Ga. 30311 (US) | ||
| Filed on Aug. 17, 2004, as Appl. No. 10/919,488. | ||
| Prior Publication US 2006/0037727 A1, Feb. 23, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. D21H 17/55 (2006.01); C08F 8/00 (2006.01) | ||
| U.S. Cl. 162—168.3 [162/158; 162/164.3; 162/166; 525/328.3; 525/329.4; 525/383] | 31 Claims |
| 1. A composition for enhancing the wet strength of paper comprising a blend of two components:
(a) a polymeric paper strengthening agent; and
(b) a stabilized glyoxalated polyacrylamide in a concentration of between about 40% and about 99% by weight of the two components,
wherein the stabilized glyoxalated polyacrylamide is prepared by (1) reacting a first portion of glyoxal with a polyacrylamide
having pendant amide groups to form a first reaction mixture comprising glyoxalated polyacrylamide; (2) adding an acid to
the first reaction mixture to form a second reaction mixture having a reduced pH and comprising the glyoxalated polyacrylamide;
and (3) adding a second portion of glyoxal to the second reaction mixture to form the stabilized glyoxalated polyacrylamide.
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