US 11,773,279 B2
Oxidation-resistant ink compositions and methods of use
Nadeepuram K. Ranganathan, Irvine, CA (US); Barry Brucker, Beverly Hills, CA (US); and Ramesh Subbaraman, Fullerton, CA (US)
Assigned to Independent Ink, Inc., Gardena, CA (US)
Filed by Independent Ink, Inc., Gardena, CA (US)
Filed on Nov. 3, 2022, as Appl. No. 17/980,523.
Application 17/980,523 is a continuation in part of application No. 17/865,210, filed on Jul. 14, 2022, granted, now 11,492,507.
Claims priority of provisional application 63/394,105, filed on Aug. 1, 2022.
Claims priority of provisional application 63/221,848, filed on Jul. 14, 2021.
Prior Publication US 2023/0083402 A1, Mar. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 11/00 (2014.01); C09D 11/36 (2014.01); C09D 11/322 (2014.01); B41M 5/00 (2006.01); C09D 11/037 (2014.01); C09D 11/033 (2014.01); C09D 11/102 (2014.01); C09D 1/00 (2006.01); C09D 4/00 (2006.01); C09D 5/00 (2006.01); C09K 3/00 (2006.01)
CPC C09D 11/36 (2013.01) [B41M 5/00 (2013.01); C09D 11/033 (2013.01); C09D 11/037 (2013.01); C09D 11/102 (2013.01); C09D 11/322 (2013.01)] 24 Claims
 
1. A method of printing comprising:
applying an ink composition onto an oxidizing and alkaline substrate as a print, the ink composition comprising:
water;
from 10 wt. % to 72 wt. % at least one solvent; and
from 1 wt. % to 10 wt. % at least one pigment;
wetting the surface of the oxidizing and alkaline substrate via the water in the ink composition so as to cause the oxidizing and alkaline substrate to release nascent oxygen; and
stabilizing the ink composition on the surface of the oxidizing and alkaline substrate in the presence of the nascent oxygen via the resistance to oxidation of the least one pigment;
wherein the at least one pigment is loaded in the ink composition sufficiently to meet print color and optical density requirements for application onto the oxidizing and alkaline substrate while the ink composition still also meets duty cycle requirements via the at least one solvent.