Curable epoxy compositions containing aziridine in supercritical

Details Curable epoxy compositions containing aziridine in supercritical Curable epoxy compositions containing aziridine in supercritical

1995-08-15

1998-01-27

Wilson, Donald R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523429, 525526, 528116, 528319, 528411, 528412, 528416, 528312, 528315, 528408, C08K 300, C08K 6300, C08G 5950, C08G 5956

Patent

active

057123314

ABSTRACT:
A curable resin system in supercritical carbon dioxide as diluent includes an epoxy resin, a co-reactant selected from poly N-substituted aziridines, and a catalyst to promote cure at ambient temperature. The system is compatible with various epoxy resins such as bisphenol A epoxy, bisphenol F epoxy, novolac epoxy, cycloaliphatic epoxy, triglycidyl-aminophenol, and triglycidyl isocyanurate. The aziridine co-reactant may be selected from reaction products of NH aziridines with acrylates and methacrylates of trimethylolpropane, ethylene glycol, propylene glycol, bisphenol A, bisphenol F, pentaerythritol, glycerol, and their alkoxylated derivatives; reaction products of NH aziridines with epoxy compounds; and 1-aziridine ethanol and its reaction products with epoxy and isocyanate functional compounds. Suitable catalysts include acid salts and complexes, strong electron accepting compounds, combinations of silicon hydrides and metal complexes, and non-halogen containing boron derivatives. As an option, compounds having active hydrogen, such as mono or multifunctional phenols, alcohols, and carboxylic acids, with or without anhydrides, may be added. The curable resin system provides controlled cure rates at ambient temperature, compatibility with SCF CO.sub.2 spray application systems, and no release of volatile organic compounds during cure.

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