SYNOPSISPreparation of in situ-modified cyclohexanone-formaldehyde and acetophenoneformaldehyde resins with compounds such as diphenols, melamine, andp-toluene sulfonamide were studied.Modification of acetophenoneformaldehyde resins with hydroxylamine, semicarbazide, phenylhydrazine, phthalic anhydride, and acetic anhydride was also studied. Melting points, solubilities in organic solvents, and FI?R and NMEt spectra of modified resins were determined.
I NTRO D UCTlO NModification of cyclohexanone-formaldehyde resin via its hydroxyl and carbonyl groups has been previously studied.' Hydroxyl groups were reacted with acetyl chloride, benzoyl chloride, phthalic anhydride, and carbonyl groups with hydroxylamine, semicarbazide, and phenylhydrazine.In situ modification of acetophenone resin has been studied previously. The modifier compounds were phenol, p -cumylphenol, and p -cres01.~ The resulting resins were used for adhesives and binders.Modified cyclohexanone / formaldehyde resins were also prepared using MEK, MIBK, methylcyclohexanone, acetaldehyde, propionaldehyde, and cinnamaldehyde. These resins were used as binders for self-hardening molds.5In this work, cyclohexanone-formaldehyde and acetophenone-formaldehyde resins were modified during the preparation by the addition of a modifier compound/ formaldehyde mixture to the polymerization media. Compounds that react with formaldehyde in basic media were used as modifier compounds. These were melamine, resorcinol, p -toluene sulfonamide, bisphenol-A, and bisphenol-C.Modification of the acetophenone-formaldehyde resin via hydroxyl and carbonyl groups and reaction