Filler for heat-sensitive recording paper and process for produc

Details Filler for heat-sensitive recording paper and process for produc Filler for heat-sensitive recording paper and process for produc

1990-02-13

1991-11-12

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Silicon dioxide containing

423339, C01B 3312

Patent

active

050644734

ABSTRACT:
Disclosed herein is a filler for heat-sensitive recording paper which comprises amorphous silica obtained by reacting hydrosilicofluoric acid and/or an alkali salt thereof with an alkali (such as ammonia and dimethylamine). The filler has a solid acid strength (pk.sub.a) of +6.8 to 3.3, and oil absorption value of 120 to 200 ml/100 g, a nitrogen adsorption specific surface area of 110 to 350 m.sup.2 /g (by BET method), and a water vapor adsorption specific surface area of 200 to 300 m.sup.2 /g (by BET method).

REFERENCES:
patent: 1235552 (1917-08-01), Chappell
patent: 2780522 (1957-02-01), Gloss et al.
patent: 4026997 (1977-05-01), Schneider et al.
patent: 4509064 (1985-04-01), Usni et al.
Patent Abstracts of Japan, vol. 10, No. 204 (M-499) (2260) 17 Jul. 1986.
Patent Abstracts of Japan, vol. 11, No. 135 (M-585)(2582) 28 Apr. 1987.

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