| abstract |
Disclosed is an improved method for reducing the static sensitivity of a heat sensitive coating composition while not deteriorating the dynamic sensitivity, wherein N-(p-toluenesulphonyl)-N'-(3-p-toluenesulphonyl-oxy-phenyl)urea having an X-ray powder pattern having Bragg angles (2θ/CuKα) of 10.3, 11.1, 13.0, 13.3, 15.6, 17.1, 18.1, 18.4, 19.6, 20.0, 20.8, 21.3, 23.1, 25.0, 25.5, 26.4, 26.8, 27.5, 29.1, 32.8 is used as a colour developer. |