Water based primer compositions
OwnerDaqlip Kohli, Elaine Dickersoninventors
Life of this patent
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Abstract
The subject invention pertains to an aqueous primer for use on metal surfaces to which a composite or a metal adherend is bonded. The primer composition includes an aqueous dispersion of: (a) at least one thermosetting resin curable at an elevated temperature; (b) at least one organosilane, each said organosilane containing at least one hydrolyzable group; and (c) a curing agent. The aqueous primer composition contains substantially no volatile organic solvent, is environmentally superior to solvent-based primers, is storage stable, exhibits excellent solvent resistance and performs without loss of physical properties.
Claims21
A process for adhering a first metal to a second adherend, comprising:
- (a) applying to said first metal a primer composition comprising an aqueous dispersion of:
- (i) at least one thermosetting resin curable at an elevated temperature;
- (ii) at least one organosilane, each said organosilane containing at least one hydrolyzable group;
- and (iii) a curing agent;
- (b) applying a thermosetting adhesive between the primed surface of said first metal and said second adherend;
- and
- (c) applying heat and pressure sufficient to cure said thermosetting adhesive.
A process for preparing a composite article comprising a metal article and a layer of crosslinkable resin bonded thereto comprising:
- (a) applying to said metal article a primer composition, comprising an aqueous dispersion of:
- (i) at least one thermosetting resin curable at an elevated temperature;
- (ii) at least one organosilane, each said organosilane containing at least one hydrolyzable group;
- and (iii) a curing agent;
- (b) applying a crosslinkable resin to said primed surface of said metal article;
- and
- (c) curing said crosslinkable resin.
A process for priming a metal surface comprising the steps of:
- (a) coating the metal surface with a primer composition comprising an aqueous dispersion of:
- (i) at least one thermosetting resin curable at an elevated temperature;
- (ii) at least one organosilane, each said organosilane containing at least one hydrolyzable group;
- and (iii) a curing agent;
- and
- (b) heating the primer composition to a temperature sufficiently high to crosslink the primer composition to form an adherend coating on the metal surface.
Dependencies are inferred from the claim text.