Epoxy adhesives with dithiooxamide adhesion promoters
First Claim
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1. A curable, structural epoxy adhesive composition for bonding to oily metal comprising:
- (a) an epoxy resin;
(b) a phenalkylene amine curing agent for the epoxy resin; and
(c) a compound of the formula I ##STR5## in which R1 and R2, which may be the same or different, are selected from an alkyl group, a hydroxyalkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, or a heterocyclic group in which the one to three non-carbon atoms in the ring are independently selected from S, N, and O, wherein said compound of formula I is soluble in the adhesive composition and wherein said composition has a greater amount of cohesive failure when bonded to a steel surface coated with 150 mg/ft2 of oil than an otherwise identical composition without component (c).
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Abstract
The invention provides a curable, structural epoxy adhesive composition comprising: (a) an epoxy resin; (b) a curing agent for the epoxy resin; and (c) a compound of the formula I: ##STR1## in which R1 and R2, which may be the same or different, are selected from an alkyl group, a hydroxyalkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, or a heterocyclic group in which the one to three non-carbon atoms in the ring are independently selected from S, N, and O.
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13 Claims
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1. A curable, structural epoxy adhesive composition for bonding to oily metal comprising:
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(a) an epoxy resin; (b) a phenalkylene amine curing agent for the epoxy resin; and (c) a compound of the formula I ##STR5## in which R1 and R2, which may be the same or different, are selected from an alkyl group, a hydroxyalkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, or a heterocyclic group in which the one to three non-carbon atoms in the ring are independently selected from S, N, and O, wherein said compound of formula I is soluble in the adhesive composition and wherein said composition has a greater amount of cohesive failure when bonded to a steel surface coated with 150 mg/ft2 of oil than an otherwise identical composition without component (c). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An adhesive composition for bonding to oily metal comprising:
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(a) an aliphatic epoxy resin; (b) an aromatic epoxy resin; (c) a phenalkylene amine curing agent; and (d) a compound of the formula I ##STR6## wherein said compound of formula I is soluble in the adhesive composition and wherein said composition has a greater mount of cohesive failure when bonded to a steel surface coated with 150 mg/ft2 of oil than an otherwise identical composition without component (d).
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Specification