Epoxy resins cured with mixed methylene bridged poly(cyclohexyl-aromatic)amine curing agents
AssigneeAir Products and Chemicals, Inc.
InventorsDavid A. Dubowik, Peter A. Lucas, Andrea K. Smith
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Abstract
This invention pertains to epoxy resins having increased chemical resistance to solvents, and good cured mechanical properties which are prepared by curing the epoxy resins with a curing agent comprising a mixture of methylene bridged poly(cyclohexyl-aromatic)amines. The methylene bridged poly(cyclohexyl-aromatic)amine curing agents are the residue obtained from the distillation of a mixture of poly(cyclohexylaromatic)amines formed by the hydrogenation of crude methylenedianiline or crude di(4-amino-3-methylcyclohexyl)methane.
Claims31
In a polyepoxide resin comprising the reaction product of a polyglycidyl polyether of a polyhydric alcohol having terminal 1,2 epoxy groups cured with a polyamine curative, the improvement which comprises the incorporation of a methylene bridged poly(cyclohexyl-aromatic)amine mixture designated MPCA, wherein the MPCA contains 3 ring and higher ring components, represented by the formula:
- ##STR4## wherein R is hydrogen or methyl, x is 1-3 and y is 0-2 and the sum of x and y is from 2 to 4.
In a process for forming an epoxy resin by reacting a polyglycidyl ether of a polyhydric phenol with a polyamine curative wherein the ratio of polyglycidyl ether of a polyhydric phenol to polyamine curative is from 0.6-1.7 amine hydrogens per epoxide equivalent of polyglycidyl ether of a polyhydric phenol, the improvement which comprises utilizing a polyamine curative mixture designated MPCA, wherein the MPCA contains 3 ring and higher ring components, represented by the formula:
- ##STR5## wherein R is hydrogen or methyl, x is 1-3 and y is 0-2 and the sum of x and y is from 2 to 4 as at least a portion of said polyamine curative.
Dependencies are inferred from the claim text.