Low odor, fast cure, toughened epoxy adhesive
AssigneeAshland Licensing and Intellectual Property LLC
InventorMichael J. Barker
Life of this patent
Estimating the term…
Abstract
An epoxy adhesive composition of an epoxy resin and an amine hardener includes a synergistic accelerator of an effective amount of short chain polyol and an effective amount of a dihydric phenol having between about 6 and about 24 carbon atoms. Surfaces of adherends are joined with the dried residue of the epoxy adhesive composition by applying the epoxy resin composition to one or both surfaces, joining the surfaces, and applying pressure, optionally with heating. The joined adherends having the dried epoxy resin composition is another disclosed embodiment.
Claims32
In an epoxy adhesive composition of an epoxy resin and an amine hardener, the improvement for enhancing reaction rate and adhesion to SMC substrates, which comprises:
- a synergistic accelerator comprising about 0.1% to about 3% based on weight of the epoxy resin of an aliphatic polyhydric polyol containing from about 2 to about 15 carbon atoms and bearing from about 2 to about 10 hydroxyl functionality groups, and an effective amount of an aromatic dihydric phenol having between about 6 and about 24 carbon atoms wherein the amine hardener is selected from the group consisting of an aliphatic polyamine modified by condensation with a tall oil fatty acid, a Mannich base, an aromatic polyamine, an amidoamine and a polyamide.
A method for joining a first substrate having a first surface to a second substrate having a second surface with an adhesive composition, which comprises the steps of:
- (a) applying said adhesive composition to one or more of said first surface or said second surface, said adhesive composition comprising:
- (i) an epoxy resin;
- (ii) an amine hardener for said epoxy resin selected from the group consisting of an aliphatic polyamine modified by condensation with a tall oil fatty acid, a Mannich base, an aromatic polyamine, an amidoamine and a polyamide;
- and (iii) a synergistic accelerator comprising about 0.1% to about 3% based on weight of the epoxy resin of an aliphatic polyhydric polyol containing from about 2 to about 15 carbon atoms and bearing from about 2 to about 10 hydroxyl functionality groups, and an effective amount of an aromatic dihydric phenol having between about 6 and about 24 carbon atoms;
- (b) joining said first and second surfaces;
- and (c) applying pressure to said joined first and second surfaces to cure said adhesive composition.
A joined product of a first substrate having a first surface and a second substrate having a second surface, said surfaces joined by the dried residue of an adhesive composition, said adhesive composition comprising:
- an epoxy adhesive composition comprising:
- (a) an epoxy resin;
- (b) an amine hardener for said epoxy resin selected from the group consisting of an aliphatic polyamine modified by condensation with a tall oil fatty acid, a Mannich base, an aromatic polyamine, an amidoamine and a polyamide;
- and (c) a synergistic accelerator comprising about 0.1% to about 3% based on weight of the epoxy resin of an aliphatic polyhydric polyol containing from about 2 to about 15 carbon atoms and bearing from about 2 to about 10 hydroxyl functionality groups, and an effective amount of an aromatic dihydric phenol having between about 6 and about 24 carbon atoms.
Dependencies are inferred from the claim text.