US 12,435,239 B2
Coating compositions and methods including carbodiimides
John Schneider, Allison Park, PA (US); Martin Neal, Mars, PA (US); Hilary Ann Kerchner, Gibsonia, PA (US); Johnathan Michael Roppo, Pittsburgh, PA (US); and Hongying Zhou, Allison Park, PA (US)
Assigned to PPG Industries Ohio, Inc., Cleveland, OH (US)
Appl. No. 18/546,451
Filed by PPG Industries Ohio, Inc., Cleveland, OH (US)
PCT Filed Feb. 17, 2022, PCT No. PCT/US2022/016740
§ 371(c)(1), (2) Date Aug. 15, 2023,
PCT Pub. No. WO2022/178091, PCT Pub. Date Aug. 25, 2022.
Claims priority of provisional application 63/150,792, filed on Feb. 18, 2021.
Prior Publication US 2024/0158663 A1, May 16, 2024
Int. Cl. C09D 175/08 (2006.01); C08G 18/09 (2006.01); C08G 18/24 (2006.01); C08G 18/28 (2006.01); C08G 18/48 (2006.01); C08G 18/75 (2006.01); C08G 18/81 (2006.01); C09D 5/00 (2006.01); C09D 5/03 (2006.01); C09D 5/08 (2006.01)
CPC C09D 175/08 (2013.01) [C08G 18/095 (2013.01); C08G 18/246 (2013.01); C08G 18/289 (2013.01); C08G 18/4833 (2013.01); C08G 18/758 (2013.01); C08G 18/8108 (2013.01); C09D 5/002 (2013.01); C09D 5/03 (2013.01); C09D 5/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for improving adhesion of a coating to a substrate and/or for improving edge coverage and corrosion resistance of a coating on a substrate, comprising:
contacting at least a portion of the substrate with a surface coating comprising:
(i) a multi-unit carbodiimide of the formula (I):

OG Complex Work Unit Chemistry
wherein
n is at least 2; and
(ii) a siloxane of the formula (II):

OG Complex Work Unit Chemistry
 or
(iii) a compound formed from the reaction of the compound of formula (I) with the compound of formula (II) having the formula (III):

OG Complex Work Unit Chemistry
wherein:
R1 and R3 each independently comprise a group selected from alkyl, arylalkyl, cycloalkyl, ether, polyether, siloxane, urethane, urea, imine, amide, carbodiimide, isocyanate, carbonyl, and carbamate;
R2 comprises a group selected from alkyl, arylalkyl, and cycloalkyl;
R4 comprises a group selected from hydrogen, alkyl, arylalkyl, cycloalkyl, amine, and siloxane, wherein R4 comprises at least one amine group;
R5 comprises a comprises a group selected from alkyl, arylalkyl, cycloalkyl, amine, and amide;
m+p is at least 2; and
the dashed lines represent tautomerization wherein any one of the carbon-nitrogen bonds is a double bond;
applying, to the surface coating, an overcoat comprising a group reactive with the surface coating; and
curing overcoat to form a coating layer.