US 12,018,135 B2
Encapsulation by cross-linking of anionic polymers by pH induced dissociation of cation-chelate complexes
Herbert B. Scher, Moraga, CA (US); Scott Strobel, Davis, CA (US); Tina Jeoh Zicari, Davis, CA (US); and Dana Wong, Davis, CA (US)
Assigned to THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, Oakland, CA (US)
Filed by THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, Oakland, CA (US)
Filed on Jun. 2, 2021, as Appl. No. 17/336,766.
Application 17/336,766 is a continuation of application No. PCT/US2019/064333, filed on Dec. 3, 2019.
Claims priority of provisional application 62/775,331, filed on Dec. 4, 2018.
Prior Publication US 2022/0025132 A1, Jan. 27, 2022
Int. Cl. C08J 3/24 (2006.01); B01J 13/04 (2006.01); B01J 13/14 (2006.01); C08K 3/16 (2006.01); C08K 3/28 (2006.01); C08K 5/095 (2006.01); C08K 5/5357 (2006.01)
CPC C08J 3/24 (2013.01) [B01J 13/043 (2013.01); B01J 13/14 (2013.01); C08K 3/16 (2013.01); C08K 3/28 (2013.01); C08K 5/095 (2013.01); C08K 5/5357 (2013.01); C08J 2305/04 (2013.01); C08J 2305/08 (2013.01); C08K 2003/162 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of cross-linking polymer molecules, the method comprising:
(a) providing a solution of an acidic chelating agent with a volatile base;
(b) adding at least one source of multivalent cations to form cation-chelate complexes in the solution;
(c) mixing molecules of at least one anionic polymer with the solution of cation-chelate complexes and volatile base; and
(d) vaporizing the volatile base of the solution, thereby disassociating the cation-chelate complexes and releasing multivalent cations and cross-linking the polymer molecules with said multivalent cations.