Aldimine containing glass bonding primer

Abstract

A novel primer composition contains aldimine and/or epoxy resins, a process of making such primer to be used in glass bonding adhesive kit.

1 . A primer composition comprising, based on the total weight of the composition, an organic solvent; an aldimine; an alkoxysilane; a non-reactive film forming resin; a polyisocyanate prepolymer; a reactive modifier; a catalyst; and an isocyanate stabilizer. 
     
     
         2 . The primer composition of  claim 1  further comprising less than 10 wt. % of an epoxy resin. 
     
     
         3 . The primer composition of  claim 2  wherein the epoxy resin is a diglycidyl ether of bisphenol A. 
     
     
         4 . The primer composition of  claim 1  is substantially free of carbon black. 
     
     
         5 . The primer composition of  claim 1  is free of carbon black. 
     
     
         6 . The primer composition of  claim 1  wherein the organic solvent comprises one of acetone, methyl ethyl ketone, and a mixture thereof; and wherein the reactive modifier is an oxazolidine containing compound. 
     
     
         7 . The primer composition of  claim 1  wherein the isocyanate stabilizer comprises diethyl malonate. 
     
     
         8 . The primer composition of  claim 1  wherein the aldimine is a dialdimine. 
     
     
         9 . The primer composition of  claim 8  wherein the aldimine is a reaction product of polyetheramines and benzaldehyde. 
     
     
         10 . The primer composition of  claim 1  wherein alkoxysilane is a reaction product of gamma-mercaptopropyltrimethoxysilane and hexamethylene diisocyanate (HDI) biuret.