Amorphous silica filler

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

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428206, 428323, 428324, 428688, 428913, B32B 300

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active

054180430

ABSTRACT:
The amorphous silica has a large apparent specific gravity despite of its BET specific surface area of 200 to 500 m.sup.2 /g, has an oil absorption amount of as small as 50 to 120 ml/100 g, has an agglomeration degree (D1/D0=DA) defined by the ratio of silica elementary particle diameter D0 to primary particle diameter D1 of from 10 to 50, and has nearly a spherical particulate structure which is quite different from that of the conventional gelation method silica (DA=OO). The amorphous silica-type filler exhibits excellent properties in regard to handling, processability, dispersion property and abrasion-resistant property and, when added as, for example, an anti-blocking agent, makes it possible to obtain resin films having transparency and scratch-resistant property without fisheyes or voids. Owing to the above properties, the amorphous silica that is used as a filler for the heat-sensitive recording papers suppresses ground fogging, improves the image concentration, makes it possible to apply a highly viscous coating solution since the filler dispersed in an aqueous solution creates very small viscosity, and imparts excellent abrasion resistance to the apparatus during the step of coating.

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H. F. Mark et al, `Kirk-Othmer Encyclopedia of Chemical Technology, 3rd Edn. vol. 20` 1978, Wiley & Sons, New York.
World Patents Index Week 9005, Derwent Publ. Ltd, London GB; AN 84-066295/11 & JP-B-2 001 030 (Mizusawa KK) 10 Jan. 1990.
World Patents Index Latest Week 8849, Derwent Publ. Ltd, London GB; AN 83-38088K/16 & JP-B-63 058 170 (Sumimoto Chemical KK).

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