FILLER FOR HEAT-SENSITIVE RECORDING PAPER

摘要

Particulate material suitable for use as a filler in the heat-sensitive recording layer of a heat-sensitive recording paper comprises an amorphous silicate having a composition represented by the following oxide molecular ratio:… MO : SiO2 = 0.01 : 1 to 1.1 : 1… wherein M represents at least one member selected from the group consisting of calcium, barium and zinc, or a product obtained by partially neutralising said silicate with carbon dioxide, said material having a BET specific surface area of 10 to 70 m<2>/g and a bulk density of 0.14 to 0.30 g/cc and also having such a secondary particle size distribution that secondary particles having a size smaller than 4 mu m, as determined by the centrifugal precipitation method, constitute at least 70 % by weight of the total particles.