| 摘要 |
Zinc-modified phenol-aldehyde novolak resins for use as a color-developing agent in pressure-sensitive record sheet material are made by reacting together, preferably by heating, particulate zinc oxide or carbonate, ammonium benzoate and a phenol-aldehyde novolak resin. The resulting modified resin has good color developing properties and is resistant to desensitization when coated on to paper and dried in contact with a heated drum. |
