BIS PHENOL A EPOXY RESIN

Complex mixtures of value as cationic binders for use in cathodic coatings have been derived from the reactions of substituted ureas, nonylphenol and formaldehyde. For example, the diketimine from diethylenetriamine and methyl isobutyl ketone (which served as a protective group in the first stsge of the process) by reaction with tolylene diisocyanate (semi-blocked with 2-ethylhexanol) afforded a urea. Treatment of the reaction mixture, presumably after removal of the ketonic group, with nonylphenol and aqueous formaldehyde gave a product which after solvent dilution was then reacted with bis-phenol A epoxy resin in diglyme solution (ref. 50). Such products can only be visualised as complex mixtures. 

Kanerva L, Jolanki R, Estlander T (1991) Allergic contact dermatitis from non-diglycidyl-ether-of-bis-phenol-A epoxy resins. Contact Dermatitis 24 293-300... 

Kanerva L, Jolanki R, Estlander T (1997) Allergic contact dermatitis from non-diglycidyl-ether-of-bis-phenol-A epoxy resins. Contact Dermatitis 36 34-38 Tarvainen K, Jolanki R, Estlander T, Tupasela O, Pfaffli P, Kanerva L (1995) Immunologic contact urticaria due to airborne methylhexahydrophthalic and methyltetrahydrophthalic anhydrides. Contact Dermatitis 32 204-209... 

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See also in sourсe #XX -- [ ]

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