	US 11,767,412 B2
	Manufacturing process for dark-color polymer composite films
Aruna Zhamu, Springboro, OH (US); and Bor Z. Jang, Centerville, OH (US)
Assigned to Global Graphene Group, Inc., Dayton, OH (US)
Filed by Global Graphene Group, Inc., Dayton, OH (US)
Filed on Nov. 12, 2021, as Appl. No. 17/525,396.
Application 17/525,396 is a division of application No. 16/025,343, filed on Jul. 2, 2018, granted, now 11,186,704.
Prior Publication US 2022/0064406 A1, Mar. 3, 2022
Int. Cl. C08K 5/3417 (2006.01); C08K 11/00 (2006.01); C08J 5/18 (2006.01); C09B 47/04 (2006.01)

CPC C08K 5/3417 (2013.01) [C08J 5/18 (2013.01); C08K 11/00 (2013.01); C09B 47/04 (2013.01); C08J 2379/06 (2013.01); C08J 2379/08 (2013.01)]

12 Claims

1. A process for producing a phthalocyanine compound-filled polyimide film comprising the steps of:

a) Mixing a phthalocyanine compound with a polyimide precursor material and a liquid to form a slurry or solution, wherein said slurry or suspension further comprises a cure agent or anhydride selected from the group consisting of benzenetetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride, diethylenetriaminepentaacetic dianhydride (DTPA), ethylenediaminetetraacetic dianhydride (EDTA), mellitic acid dianhydride (MADA), naphthalenetetracarboxylic dianhydride, oxydibenzoic dianhydride, oxydiphthalic anhydride (ODPA), phthalic anhydride, and combinations thereof;

b) forming a wet film from said slurry or solution;

c) partially or completely removing said liquid from said wet film to form a precursor polyimide composite film; and

d) imidizing said precursor polyimide composite film to 90% or more completion of the crosslinking reaction, to obtain said phthalocyanine compound-filled composite film.