Filled paper

Details Filled paper Filled paper

1979-09-11

1980-12-23

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

D21H 378

Patent

active

042408709

ABSTRACT:
The filled paper is filled with at least one of (i) a calcium carbonate in the form of particles comprising a core about 0.5 to about 6.5 .mu.m in average diameter and about 100 to about 4000 projections formed on the surface of the core and having a length (L) of about 0.25 to about 2.00 .mu.m, a diameter (D) of about 0.08 to about 0.20 .mu.m and an aspect ratio (L/D) of about 3 to about 10, the calcium carbonate having a void volume of about 1.0 to about 1.8 ml/g and an oil absorption of about 45 to about 60 ml/100 g, and (ii) a calcium carbonate in the form of particles comprising a core about 0.2 to about 2.0 .mu.m in average diameter and about 100 to about 4000 projections formed on the surface of the core and having a length (L) of about 0.15 to about 4.00 .mu.m, a diameter (D) of about 0.05 to about 0.20 .mu.m and an aspect ratio (L/D) of about 3 to about 20, the calcium carbonate having a void volume of about 1.8 to about 3.3 ml/g and an oil absorption of about 50 to about 100 ml/100 g.
The paper has increased stiffness and enhanced opacity with reduced weight.

REFERENCES:
patent: 1372193 (1921-03-01), Roon
patent: 2538802 (1951-01-01), Schur
patent: 3133824 (1964-05-01), Podschus
patent: 4018877 (1977-04-01), Woode
patent: 4124688 (1978-11-01), Shibazaki et al.
patent: 4133894 (1979-01-01), Shibazaki et al.
patent: 4157379 (1979-01-01), Arika et al.

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