Epoxy resin curing compositions and epoxy resin systems including same
AssigneeMomentive Specialty Chemicals Inc.
InventorsLarry Steven Corley, Carlton E. Ash
Life of this patent
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Abstract
Disclosed are epoxy resins exhibiting a highly favorable combination of tensile strength and elongation with respect to prior art epoxy systems. The elastomeric epoxy resin systems of the invention are prepared utilizing a curing agent containing at least one monoprimary amine, and are particularly useful in applications such as, for example, castings, potting, composites, crack sealing, coatings, adhesives, roofing materials, flooring or reinforced membranes.
Claims23
A composition comprising an epoxy resin system, the epoxy resin system comprising a reaction product of:
- an epoxy resin component;
- a curing agent comprising a monoprimary amine represented by the formula R—NH2 wherein R is a hydrocarbyl group containing between about 8 and about 50 carbon atoms;
- and
- an accelerator selected from the group consisting of sulfonates, phosphonates, sulfates, tetrafluoroborates, carboxylates and nitrates of Groups IA, IIA and transition metals of the Periodic Table (CAS version);
- inorganic acids, carboxylic acids, phenolic compounds, imidazoles, cyanamide, sulfonamides, and imides;
- wherein the curing agent is substantially free of a crosslinking agent having at least 3 active hydrogen atoms;
- and
- wherein, when cured, the reaction product exhibits a tensile strength of >1 MPa and an elongation of >100% as measured by ASTM D-638 at 25° C., wherein the composition is free of asphalt.
A composition comprising a curable epoxy resin system, the curable epoxy resin system comprising a reaction product of:
- an epoxy resin component;
- a curing agent consisting essentially of a monoprimary amine represented by the formula R—NH2 wherein R is a hydrocarbyl group containing between about 8 and about 50 carbon atoms;
- and
- an accelerator selected from the group consisting of sulfonates, phosphonates, sulfates, tetrafluoroborates, carboxylates and nitrates of Groups IA, IIA and transition metals of the Periodic Table (CAS version);
- inorganic acids, carboxylic acids, phenolic compounds, imidazoles, cyanamide, sulfonamides, and imides:
- wherein the curing agent is substantially free of a crosslinking agent having at least 3 active hydrogen atoms;
- wherein, when cured, the reaction product of the epoxy resin component and the curing agent exhibits a tensile strength of >1 MPa and an elongation of >100% as measured by ASTM D-638 at 25° C, wherein the composition is free of asphalt.
A composition comprising an epoxy resin system, the epoxy resin system comprising a reaction product of:
- an epoxy resin component;
- a curing agent comprising greater that 70 wt % of a monoprimary amine represented by the formula R—NH2 wherein R is a hydrocarbyl group containing between about 8 and about 50 carbon atoms;
- and
- an accelerator selected from the group consisting of sulfonates, phosphonates, sulfates, tetrafluoroborates, carboxylates and nitrates of Groups IA, HA and transition metals of the Periodic Table (CAS version);
- inorganic acids, carboxylic acids, phenolic compounds, imidazoles, cyanamide, sulfonamides, and imides;
- wherein the curing agent is substantially free of a crosslinking agent having at least 3 active hydrogen atoms;
- wherein, when cured, the reaction product of the epoxy resin component and the curing agent exhibits a tensile strength of >1 MPa and an elongation of >100% as measured by ASTM D-638 at 25° C, wherein the composition is free of asphalt.
A composition comprising an epoxy resin system, the epoxy resin system comprising a reaction product of:
- an epoxy resin component;
- a curing agent comprising less than 20 wt % of a monoprimary amine represented by the formula R—NH2 wherein R is a hydrocarbyl group containing between about 8 and about 50 carbon atoms;
- and
- an accelerator selected from the group consisting of sulfonates, phosphonates, sulfates, tetrafluoroborates, carboxylates and nitrates of Groups IA, IIA and transition metals of the Periodic Table (CAS version);
- inorganic acids, carboxylic acids, phenolic compounds, imidazoles, cyanamide, sulfonamides, and imides;
- wherein the curing agent is substantially free of a crosslinking agent having at least 3 active hydrogen atoms;
- wherein, when cured, the reaction product of the epoxy resin component and the curing agent exhibits a tensile strength of >1 MPa and an elongation of >100% as measured by ASTM D-638 at 25° C, wherein the composition is free of asphalt.
Dependencies are inferred from the claim text.