US 12,263,254 B2
Composite materials
Jeffrey M. Catchmark, State College, PA (US); and Yuzhi Deng, University Park, PA (US)
Assigned to The Penn State Research Foundation, University Park, PA (US)
Filed by The Penn State Research Foundation, University Park, PA (US)
Filed on Feb. 15, 2023, as Appl. No. 18/110,262.
Application 18/110,262 is a continuation of application No. 15/484,329, filed on Apr. 11, 2017, granted, now 11,590,253.
Application 15/484,329 is a continuation of application No. 14/198,415, filed on Mar. 5, 2014, abandoned.
Claims priority of provisional application 61/772,716, filed on Mar. 5, 2013.
Prior Publication US 2023/0302189 A1, Sep. 28, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61L 15/28 (2006.01); A61L 15/42 (2006.01); B29C 44/34 (2006.01); B29C 48/00 (2019.01); B29K 401/00 (2006.01); B29L 31/00 (2006.01); C08J 9/00 (2006.01); C08L 3/02 (2006.01); C08L 5/08 (2006.01)
CPC A61L 15/28 (2013.01) [A61L 15/425 (2013.01); B29C 44/3415 (2013.01); B29C 48/022 (2019.02); C08J 9/0061 (2013.01); C08L 3/02 (2013.01); C08L 5/08 (2013.01); B29K 2003/00 (2013.01); B29K 2401/00 (2013.01); B29L 2031/753 (2013.01); C08J 2207/10 (2013.01); C08J 2303/02 (2013.01); C08J 2405/08 (2013.01); C08L 2203/02 (2013.01); C08L 2203/14 (2013.01)] 14 Claims
 
1. An expanded insoluble composite material comprising:
at least 75% w/w of at least one gelatinized anionic starch;
between 2% w/w and 10% w/w of at least one cationic polysaccharide, wherein the cationic polysaccharide is chitosan;
between 1% w/w and 25% w/w cellulose or nanocellulose; and
an electrostatic crosslink disposed between said at least one gelatinized anionic starch and said at least one cationic polysaccharide, wherein the composite material is insoluble in a polar solvent, and wherein the at least one gelatinized anionic starch was gelatinized from non-gelatinized anionic starch in the presence of the at least one cationic polysaccharide to form the composite material.