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US 6,486,256 B1Granted
Composition of epoxy resin, chain extender and polymeric toughener with separate base catalyst
Assignee3M Innovative Properties Company
InventorsKent S. Tarbutton, Janis Robins
Life of this patent
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Abstract
A two-part composition useful as an adhesive comprises an epoxy resin, a chain extender selected from an amine or a phenolic compound, a base catalyst and a polymeric toughener wherein Part A contains the catalyst and Part B with the epoxy resin.
Claims32
An epoxy composition comprising:
- (a) a chain extender comprising at least one of an amine and a phenolic compound, the amine being at least one of a primary mono-amine, a secondary di-amine and other amines having two reactive hydrogens per molecule;
- (b) a base catalyst;
- (c) a reactive epoxy resin that has not been substantially chain extended;
- and
- (d) a polymeric toughener,
- wherein the chain extender, the reactive epoxy resin, the catalyst and the toughener are each in an amount and of a type that, when mixed together, form a thermally curable composition, the composition comprises a part A and a part B, with the part A comprising the catalyst and the part B comprising the reactive epoxy resin, the composition is substantially free of a polyfunctional curing agent and exhibits a stoichiometric equivalents ratio of reactive hydrogen sites to reactive epoxy sites that is less than 1.0, the epoxy and chain extender are substantially unreacted when the composition is exposed to the catalyst and, during the curing of the composition, at least about 50% by weight of the epoxy resin is chain extended and the chain extended epoxy resin is cross-linked.
3 more elements
An epoxy composition comprising:
- (a) a chain extender that includes catechol and that is at least substantially in monomeric form;
- (b) a base catalyst;
- (c) a reactive epoxy resin that has not been substantially chain extended;
- and
- (d) a polymeric toughener,
- wherein the chain extender, the reactive epoxy resin, the catalyst and the toughener are each in an amount and of a type that, when mixed together, form a thermally curable composition, the composition comprises a part A and a part B, with the part A comprising the catalyst and the part B comprising the reactive epoxy resin, the composition is substantially free of a polyfunctional curing agent and exhibits a stoichiometric equivalents ratio of reactive hydrogen sites to reactive epoxy sites that is less than 1.0 so as to provide excess epoxy for cross-linking, the epoxy and chain extender are substantially unreacted when the composition is exposed to the catalyst, and during the curing of the composition, at least about 50% by weight of the epoxy resin is chain extended.
3 more elements
Dependencies are inferred from the claim text.