US 12,421,402 B2
Coating compositions containing low molecular weight chitosan composition
Cory G. Miller, Cleveland, OH (US)
Assigned to SWIMC LLC, Cleveland, OH (US)
Filed by SWIMC LLC, Cleveland, OH (US)
Filed on Dec. 15, 2022, as Appl. No. 18/066,573.
Application 18/066,573 is a continuation of application No. 17/682,240, filed on Feb. 28, 2022, granted, now 11,560,487.
Application 17/682,240 is a continuation in part of application No. PCT/US2021/051013, filed on Sep. 20, 2021.
Claims priority of provisional application 62/706,973, filed on Sep. 22, 2020.
Prior Publication US 2023/0193059 A1, Jun. 22, 2023
Int. Cl. C09D 7/61 (2018.01); C08K 3/22 (2006.01); C08L 5/08 (2006.01); C09D 5/02 (2006.01); C09D 7/20 (2018.01); C09D 7/40 (2018.01); C09D 7/65 (2018.01); C09D 7/80 (2018.01); C09D 105/08 (2006.01); C09D 133/04 (2006.01)
CPC C09D 7/65 (2018.01) [C08K 3/22 (2013.01); C08L 5/08 (2013.01); C09D 5/022 (2013.01); C09D 5/025 (2013.01); C09D 5/028 (2013.01); C09D 7/20 (2018.01); C09D 7/61 (2018.01); C09D 7/69 (2018.01); C09D 7/80 (2018.01); C09D 105/08 (2013.01); C09D 133/04 (2013.01); C08K 2003/2241 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of making a coating composition comprising:
blending a binder, a surfactant, and a first aqueous carrier to form a pre-thin:
adding an aqueous solution of chitosan having a number average molecular weight of at most 40,000 or a weight average molecular weight of at most 75,000 or a z-average molecular weight of at most 200,000 and having a pH of less than 6.5, a pigment and a second aqueous carrier liquid, optional additives, and a base to precipitate the chitosan into precipitated chitosan;
grinding, in grind stage, the pigment with the second aqueous carrier liquid, precipitated chitosan and optional additives, to disperse the pigment, precipitated chitosan, and optional additives into a grind paste;
adding, in a wash stage using a wash liquid, the grind paste to the pre-thin;
blending, in a thindown stage, the grind paste and the pre-thin to form a coating composition having a pH of about 8 to about 10.