Two-part epoxy-based structural adhesives
Assignee3M Innovative Properties Company
InventorsChristopher J. Campbell, Alphonsus V. Pocius, Liya Gorodisher
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Abstract
A two-part epoxy-based structural adhesive composition comprising a curable epoxy resin, an amine curing agent, a toughening agent, and an oil-displacing agent. The structural adhesive may optionally include reactive liquid modifiers, fillers, secondary curatives, reactive diluents, surfactants, metal salts, pigments and combinations thereof. The structural adhesive may be used to form bonded joints between adherends having clean surfaces, as well as those having surfaces contaminated with hydrocarbon-containing materials, such as oils, processing aids and lubricating agents.
Claims19
A two-part adhesive composition having a first part and a second part, the adhesive composition comprising:
- a curable epoxy resin in the first part;
- an amine curing agent in the second part;
- a toughening agent in the first part, the second part, or combination thereof;
- an oil displacing agent in the first part, the second part, or combination thereof, wherein the solubility parameter of the oil displacing agent ranges from 7 to 10.5 cal0.5/cm3/2;
- and
- a filler in the first part, the second part, or combination thereof, wherein the filler comprises an inorganic mineral fiber comprising from about 37% to about 42% by weight SiO2, from about 18% to about 23% by weight Al2O3, from about 34% to about 39% by weight CaO+MgO, from 0% to about 1% by weight FeO, and about 3% by weight K2O+Na2O;
- wherein an adhesive is formed when the first part and the second part are combined.
Dependencies are inferred from the claim text.