High opacity paper containing expanded fiber and mineral pigment

Details High opacity paper containing expanded fiber and mineral pigment High opacity paper containing expanded fiber and mineral pigment

1989-06-02

1990-08-28

Chin, Peter

Paper making and fiber liberation

Processes and products

Plural fiber containing

1621811, 1621812, 1621813, 1621815, 1621816, 1621818, 162187, D21H 1767, D21H 1118

Patent

active

049522787

ABSTRACT:
A paper structure having both high opacity and improved tensile strength through the incorporation of expanded fiber and an opacifying mineral pigment, such as titanium dioxide, is disclosed. The addition of expanded fiber to the paper structure makes it possible to increase the opacity of the paper through the use of the conventional mineral pigments without adversely affecting the paper's tensile strength. These opacified paper structures are especially useful for producing high quality, strong, light weight printing and writing papers which require material pigments for enhanced opacity.

REFERENCES:
patent: 4481076 (1984-11-01), Herrick
patent: 4483743 (1984-11-01), Turbak et al.
patent: 4627743 (1986-11-01), Gess
patent: 4761203 (1988-08-01), Vinson
Casey, Pulp and Paper, 3rd Ed., vol. III, pp. 1515-1546.
Alince, "The Effect of Fiber Beating on TiO.sub.2 Pigment Performance", Tappi, Oct. 1987, pp. 114-117.
Jaycock et al., "A Study of the Retention of Pigment During Paper Formation", Journal of Colloid and Interface Sci., vol. 55, No. 1, (Apr. 1976), pp. 181-190.

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