Aldimine containing glass bonding primer
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, selected from acetone, methyl ethyl ketone, and a mixture thereof;
an aldimine;
an alkoxysilane;
a non-reactive film forming resin;
a polyisocyanate prepolymer;
a reactive modifier, which is an oxazolidine-containing compound;
a catalyst;
an isocyanate stabilizer, which is diethyl malonate; and
diglycidyl ether of bisphenol A; wherein the diglycidyl ether of bisphenol A is present at less than 10 wt %.
2. The primer composition of claim 1 which is substantially free of carbon black.
3. The primer composition of claim 1 wherein the aldimine is a dialdimine.
4. The primer composition of claim 1 wherein the aldimine is reaction of polyetheramines and benzaldehyde.
5. The primer composition of claim 1 wherein alkoxysilane is a reaction product of gamma-mercaptopropyltrimethoxysilane and hexamethylene diisocyanate(HDI) biuret.
6. The primer composition of claim 1 wherein the diglycidyl ether of bisphenol A is present at 4-8 wt %.
7. The primer composition of claim 1 wherein the diglycidyl ether of bisphenol A is present at 5-7 wt %.
8. The primer composition of claim 1 wherein the catalyst is a non-tin catalyst.