Structural adhesives
AssigneeZephyros, Inc.
InventorsMichael Czaplicki, Ira Miller, Vincent Duclos
Life of this patent
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Abstract
A thermohardenable structural adhesive material that upon curing has an elongation at break of at least 10% and has a glass transition temperature (Tg) of 80° C. or higher and is useful as a structural adhesive in automobiles to reduce the deformation of bonds particularly during accidents, the adhesive is dry to the touch at ambient temperature and can be melt processed at temperature below that at which thermohardening occurs. The adhesives are useful in applications requiring a combination of high strain to failure, glass transition temperature more than 80° C., high stiffness and high strength. This combination is of particular interest in the aerospace and automotive industries.
Claims10
A thermohardenable structural adhesive material including an epoxy resin, a thermoplastic modifier, from 2% to 50% by weight flexibilizer, an impact modifier, and a curing agent that upon curing has an elongation at break of at least 10% and has a glass transition temperature (Tg) of 80° C. or higher;
- wherein the flexibilizer includes a hydroxy terminated polyurethane polymer, polyvinyl butyral, a polyamide, a polymer that is an amine modified epoxy resin, or an epoxidized polysulfide;
- wherein the thermoplastic modifier is a phenoxy resin;
- and
- wherein the impact modifier comprises an epoxy adduct of a carboxy terminated butadiene rubber.
Dependencies are inferred from the claim text.