Amorphous silica filler

Details Amorphous silica filler Amorphous silica filler

1993-07-22

1995-01-24

Ryan, Patrick J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428195, 428206, 428331, 428913, B32B 900

Patent

active

053841913

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=.infin.). 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.

REFERENCES:
patent: 4758619 (1988-07-01), Mita et al.
patent: 4956241 (1990-09-01), Chu et al.
patent: 5137955 (1992-08-01), Tsuchiya et al.
patent: 5236683 (1993-08-01), Nakazawa et al.

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