Epoxy systems having improved fracture toughness
AssigneeEvonik Degussa GmbH
InventorsPritesh G. Patel, Judith Dolores Espinoza Perez, Gauri Sankar Lal, Jared Denis Bender, Edze Jan Tijsma
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Abstract
The disclosure relates to at least one partially reacted product of an isocyanate and an amine (e.g., a reaction product comprising at least one adducted compound). The reaction product comprises polyurea oligomers. The reaction product can be combined with at least one amine in order to formulate a curing agent for epoxy resins wherein the cured epoxy resin has enhanced fracture toughness. The at least partially reacted product does not increase the viscosity of the curing agent and is at least partially soluble in the amine component of the curing agent.
Claims9
An epoxy curing agent comprising at least one liquid polyurea oligomer and at least one polyamine, wherein the oligomer comprises an adduct of an isocyanate and aromatic diamine selected from the group consisting of polytetramethyleneoxide-di-p-aminobenzoate, polytetraethyleneoxide-di-p-aminobenzoate, polytetrapropyleneoxide-di-p-aminobenzoate, and polytetrahexyleneoxide-di-p-aminobenzoate.
Dependencies are inferred from the claim text.