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US 2012/0071584 A1Published application
Structural epoxy resins containing core-shell rubbers
OwnerAndreas Lutz, Jeannine Fluckiger +1inventors
InventorsAndreas Lutz, Jeannine Fluckiger, Cathy Grossnickel
Life of this patent
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Abstract
Core-shell rubbers are incorporated into epoxy adhesives. The adhesives are structural type adhesives that contain an epoxy resin and a toughener, and may contain a liquid rubber in addition to the core-shell rubber. The adhesives have good modulus and tensile strength, which are obtained without loss of elongation and adhesive properties.
Claims20
A structural adhesive, comprising:
- A) at least one particulate core-shell rubber;
- B) a reactive toughener that has isocyanate groups that are blocked or capped with a phenolic compound, an aminophenolic compound, a primary or secondary aliphatic or cycloaliphatic amine, a benzyl alcohol, an aromatic amine, a benzyl amine or a thiol;
- C) at least one non-rubber-modified epoxy resin;
- and
- D) one or more epoxy curing agents,
- wherein the structural adhesive is curable at a temperature of 80° C. or higher.
3 more elements
The structural adhesive of claim 11 which contains at least 12 weight percent of the reactive toughener.
A structural adhesive, comprising:
- A) at least 10 weight percent, based on the weight of the adhesive, of one or more liquid rubber-modified epoxy resins;
- B) at least 2 weight percent, based on the weight of the adhesive, of at least one core-shell rubber in the form of particles having at least one rubbery core portion and at least one shell portion that has a Tg of at least 50° C., the rubbery core constituting from 50 to 95% of the weight of the core-shell rubber particles;
- C) at least 8 weight percent, based on the weight of the adhesive, of a reactive toughener that has isocyanate groups that are blocked or capped with a phenolic compound, an aminophenolic compound, a primary or secondary aliphatic or cycloaliphatic amine, a benzyl alcohol, an aromatic amine, a benzyl amine or a thiol;
- D) at least one non-rubber-modified epoxy resin;
- and
- E) one or more epoxy curing agents,
- wherein the structural adhesive has a total rubber content of from 8 to 30% by weight and is curable at a temperature of 80° C. or higher.
4 more elements
Dependencies are inferred from the claim text.