Evonik Degussa Gmbh

Air Products and Chemicals, Inc.

Evonik Operations Gmbh

Edze Jan Tijsma

Pritesh G Patel

Gauri Sankar Lal

Shiying Zheng

Gamini Ananda Vedage

Michael Ian Cook

Shafiq Fazel

Robert Marjo Theodoor Rasing

Jared Denis Bender

Sudhir Ananthachar

Wei Cao

Marieke Theodora Arnolda Van Gorkom

Judith Dolores Espinoza Perez

Shafiq Nisarali Fazel

Marieke Theodora Van Gorkom

Amine-epoxy curing agents are disclosed including at least one saturated heterocyclic compound having two nitrogen heteroatoms according to formula (I) and at least one saturated fused bicyclic heterocyclic compound having three nitrogen heteroatoms according to formula (II): wherein X is independently selected from a hydrogen atom, a linear or branched Cto Calkyl group and a substituted or un-substituted phenyl group, Yis a direct bond or a divalent polyethylene polyamine group having 1 to 8 nitrogen atoms or a divalent polyethylene polyamine derivative having 1 to 8 nitrogen atoms, Yis a direct bond or a divalent polyethylene polyamine group having 1 to 7 nitrogen atoms and R is independently a hydrogen atom or a group selected from C-Clinear, cyclic, and branched alkyl, alkenyl, and alkaryl groups.

Nitrogen-containing heterocyclic epoxy curing agents, compositions and methods

The invention relates to structural adhesive compositions and more particularly to two-component (2K) structural adhesive compositions. The two components chemically react to bond structural surfaces. N-(3-Aminopropyl)cyclohexylamine (APCHA) has been found to be an improved curing agent for use with epoxy resins in 2K adhesive compositions. APHCA exhibits favorable features including viscosity, pot life and reactivity, and adhesive and thermal performance after curing with epoxy resin. These features and its unique chemistry allow the use of APCHA in curing agent formulations for structural adhesives, in particular wind turbine blade adhesives. APCHA solves issues with viscosity build-up, working time, through-cure, compatibility and adhesive performance that cannot be addressed with the commonly used amine formulations.

APCHA as a building block in curing agent formulations for structural adhesives

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.

Epoxy systems having improved fracture toughness

The present disclosure provides a liquid curing agent composition comprising at least 50% by weight of a polyamine and 0.2% to 10% by weight of dicyandiamide, the amine/epoxy composition and the product from the cured amine/epoxy composition.

Epoxy liquid curing agent compositions

An epoxy resin composition having a curing component and an epoxy component is disclosed. The curing component includes an amount of about 8% to about 70% by weight of the composition of a primary curing agent and about 0.001% to about 5% by weight of the composition of a secondary curing agent. The present disclosure includes the use of solid secondary curing agents, in particular solvated secondary curing agents, and methods to formulate such a solvated solid to result in a liquid curing component. The epoxy composition also includes about 30% to about 92% by weight of the composition of the epoxy component. A number of equivalents of reactive curative groups in the curing component is from about 0.50 to 0.98 times the number of epoxide equivalents present in the epoxy component. An epoxy product formed from the epoxy resin composition is also disclosed.

Epoxy resin compositions using solvated solids

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Zeist, Netherlands

Edze Jan Tijsma