Back to results
US 2013/0296489 A1Published application
Solvent-based primer solution based on silylated polyurethane (spur) chemistry for polycarbonate substrates
AssigneePPG Industries Ohio, Inc.
InventorRazmik Boghossian
Life of this patent
Estimating the term…
Abstract
A primer solution for enhanced adhesion to a rigid substrate for aviation and aerospace applications includes an aminosilane-capped polyurethane prepolymer and a first solvent. The first solvent reacts with or modifies the surface of the rigid substrate, enabling the primer solution including the aminosilane-capped polyurethane prepolymer to become a part of the surface of the rigid substrate.
Claims26
A primer solution for use on a rigid substrate, the primer solution comprising:
- a first solvent capable of reacting with or modifying a surface of the rigid substrate;
- and
- an aminosilane-capped polyurethane prepolymer represented by Chemical Formula 1a or Chemical Formula 1b:
- wherein each of R1, R1′, R2, R3 and R4 comprises an aliphatic hydrocarbon, R5 comprises a polyhydroxy linkage, R6 comprises an aliphatic or cycloaliphatic hydrocarbon group, and x is an integer between 1 and 5.
1 more element
A method of preparing a primer solution for use on a rigid substrate, comprising:
- mixing a polyol represented by Chemical Formula 3 with a first solvent capable of activating or modifying a surface of the rigid substrate;
- reacting an isocyanate represented by Chemical Formula 4 and the polyol to produce a polyurethane prepolymer represented by Chemical Formula 2;
- and
- reacting an aminosilane represented by Chemical Formula 5a or Chemical Formula 5b with the polyurethane prepolymer to produce an aminosilane-capped polyurethane prepolymer represented by Chemical Formula 1a or Chemical Formula 1b:
- wherein each of R1, R1′, R2, R3 and R4 comprises an aliphatic hydrocarbon, R5 comprises a polyhydroxy linkage, R6 comprises an aliphatic or cycloaliphatic hydrocarbon group, and x is an integer between 1 and 5
- wherein R5 comprises a polyhydroxy linkage, R6 comprise an aliphatic or cycloaliphatic hydrocarbon group, and x is an integer between 1 and 5
- (HO)aR5 Chemical Formula 3
- wherein R5 comprises a polyhydroxy linkage, and a is 1 or 2;
- R6—(N═C═O)b Chemical Formula 4
- wherein R6 comprises an aliphatic or cycloaliphatic hydrocarbon, and b is 1 or 2
- wherein R1, R1′, R3, R3′ and R3″ each comprise an aliphatic hydrocarbon, and R2 and R4 each comprise an aliphatic hydrocarbon.
8 more elements
Dependencies are inferred from the claim text.