RECORD MATERIAL CARRYING A COLOUR DEVELOPER COMPOSITION

摘要

Record material carrying a colour developer composition for use in pressure-sensitive record sets comprises an addition product of phenol and a diolefinic alkylated or alkenylated cyclic hydrocarbon. The addition product has a minimum hydroxyl number, as determined for non-hydrogen bonded hydroxyl groups only by Fourier transform infra-red spectroscopy, in the range of 120 to 140.