|||||III USOO5547541A United States Patent (19) 11) Patent Number: 5,547,541 Hansen Et Al
|||||III USOO5547541A United States Patent (19) 11) Patent Number: 5,547,541 Hansen et al. 45) Date of Patent: Aug. 20, 1996 54) METHOD FOR DENSEFYING FIBERS USING OTHER PUBLICATIONS A DENSIFYINGAGENT Gugliemelli et al., "Base-Hydrolyzed Starch-Polyacryloni (75) Inventors: Michael R. Hansen, Seattle; Richard trile (S-PAN) Graft Copolymer. S-PAN-1:1, PAN. M. W. H. Young, Sr., Renton, both of Wash. 794,000*", J. of Applied Copolymer Science, 13:2007-2017 (1969). (73) Assignee: Weyerhaeuser Company, Federal Way, Weaver et al., "Hydrolyzed Starch-Polyacrylonitrile Graft Wash. Copolymers: Effect of Structure on Properties', J. of Applied Polymer Science, 15:3015–3024 (1971). Weaver et al., "Highly Absorbent Starch-Based Polymer." 21 Appl. No.: 197483 Northern Regional Research Laboratory, Agricultural 22) Filed: Feb. 16, 1994 Research Service, U.S. Dept. of Agriculture, Peoria, Illinois, pp. 169-177. Related U.S. Application Data "Super slurpers: Time for change?,” Chemical Week, pp. 21-22 (Jul. 24, 1974). (63) Continuation-in-part of Ser. No. 931,059, Aug. 17, 1992, S. Lammie, "Use of Glycerine as a Softener for Paper Ser. No. 931,277, Aug. 17, 1992, Ser. No. 931,213, Aug. 17, 1992, Pat. No. 5,300,192, Ser. No. 931,278, Aug. 17, 1992, Products." The World's Paper Trade Review, Dec. 13, 1962, Pat. No. 5,352,480, Ser. No. 931,284, Aug. 17, 1992, Pat. p. 2050. No. 5,308,896, Ser. No. 931,279, Aug. 17, 1992, Ser. No. Lindsay, "Absorbent Starch Based Co-polymers- Their 107,469, Aug. 17, 1993, Ser. No. 108,219, Aug.
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