Coating compositions and methods including carbodiimides
AssigneePPG Industries Ohio, Inc.
InventorsJohn Schneider, Martin Neal, Hilary Ann Kerchner, Johnathan Michael Roppo, Hongying Zhou
Life of this patent
Estimating the term…
Abstract
Coated substrates and methods may comprise a multi-unit carbodiimide. The multi-unit carbodiimide may also be combined with a siloxane. The multi-unit carbodiimide and/or the siloxane may be used in a surface coating applied to a substrate, and an overcoat may be applied to the surface coating. The surface coating may chemically interact with the overcoat and/or the substrate to improve corrosion resistance and other properties of the coated substrate.
Claims20
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):
- wherein
- n is at least 2;
- and
- (ii) a siloxane of the formula (II):
- or
- (iii) a compound formed from the reaction of the compound of formula (I) with the compound of formula (II) having the formula (III):
- 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.
A coated substrate comprising:
- a substrate;
- and
- a coating applied to the substrate, the coating comprising:
- a surface coating applied to at least a portion of the substrate, the surface coating comprising a multi-unit carbodiimide bonded to a siloxane and having the formula:
- wherein:
- R1 and R3 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 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;
- and
- an overcoat layer disposed on the surface coating and chemically bonded to the surface coating through an acid functionalized or hydroxyl group of the overcoat layer.
A compound comprising a multi-unit carbodiimide bonded to a siloxane of the following formula:
- wherein:
- R1 and R3 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 alkyl, arylalkyl, cycloalkyl, amine, and siloxane, wherein R4 comprises at least one amine group;
- R5 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.
Dependencies are inferred from the claim text.