Glass primer
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsRiza N. Oezelli, Hans-Josef Hoffman, Hans-Peter Kohlstadt
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Abstract
The invention relates to a new primer for pretreating glass in readiness for waterproof bonding to other substrates. The primer contains resins, functional silanes, solvents, and organosilazanes and, if desired, polyfunctional isocyanates and other additives. Compared with conventional primers, the resistance of the bond to hydrolysis is significantly improved.
Claims17
A process for treating a glass surface before bonding to a substrate to improve the bonding characteristics of the surface and promote a hydrolysis-resistant bond comprising applying to said surface a primer composition consisting essentially of:
- A. from about 2 to about 10% by weight of at least one phenolic or hydrogenated rosin resin;
- B. from about 2.5 to about 25% by weight of at least one functional silane;
- C. from about 0.5 to about 5% by weight of at least one organosilazane obtained by reaction of ammonia or an amine with an organohalogen silane which is a disorganodihalogen silane or a triorganohalogen silane, said organo group being an alkyl or aryl group;
- D. from about 70 to about 95% by weight of an organic solvent;
- and
- E. from 0 to about 10% by weight of one or more of (a) a polyfunctional isocyanate, (b) a prepolymer of a polyhydric alcohol and a molar excess of an aliphatic or aromatic diisocyanate, and (c) an adduct of a polyfunctional epoxide and an aliphatic or aromatic diisocyanate.
Dependencies are inferred from the claim text.