| 摘要 |
PCT No. PCT/EP94/02656 Sec. 371 Date Jun. 13, 1995 Sec. 102(e) Date Jun. 13, 1995 PCT Filed Aug. 10, 1994 PCT Pub. No. WO95/05422 PCT Pub. Date Feb. 23, 1995A process is described for producing neutral to alkaline color developer pigments for use in carbon-free transfer papers from an acid-activated smectic phyllosilicate and basically reacting chemicals. The process is characterized in that the acid-activated phyllosilicate with a layer structure which is essentially still intact is reactive without intermediate drying with the basically-reacting chemicals up to partial or complete decomposition of the amorphous silicic acid formed on the corners and edges of the phyllosilicate crystallites without significant re-exchange of the hydronium ions inserted between the layers of the phyllosilicate by alkali or earth alkali ions. The color developer pigments can be used in suspensions with concentrations from 30 to 50% by weight, preferably from roughly 38 to 48% by weight.
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