1995 Volume 34 Issue 2 Pages 68-75
We have studied the new environmental resisting developer which acts as electron acceptor in the color forming reaction with leuco dye as electron donor by use of electronic molecular orbital calculation. We have newly found 2,4-Dihydoxy-2'-methoxybenzanilide (SV-3) as the excellent developer which improves the enviromental resistance of thermal image density. The SV-3 was also conirmed to be non-mutagenic in Ames-test.
The molecular orbital calculations show that the SV-3 is easy to form a stable charge transfer complex with leuco dye and also suggest that color forming stability and enviromental resistance in the thermal paper greatly depend on the degree of overlapping orbitals between the leuco dye and the developer.
