Permanent paper

Details Permanent paper Permanent paper

1993-07-07

1996-10-08

Krynski, William A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428195, 428498, 4285375, 4285377, B32B 300

Patent

active

055629741

ABSTRACT:
A permanent paper is disclosed which employs as a stock pulp slurry containing at least one kind of filler and aluminum sulfate, a hydrophobic modified rosin emulsion sizing agent and a water-soluble alkaline salt, wherein the pH where said filler is dispersed in water to form 10% of a dispersion is 4-8, the pH of said pulp slurry is controlled within 6.5-7.5 and an alkaline salt of an acid having a pKa of 5-14 at a 25.degree. C. aqueous solution is coated onto said paper and the pH of the coated paper extract in cold water is 7.5-9.0.

REFERENCES:
patent: 5013775 (1991-05-01), Oikawa et al.
patent: 5062922 (1991-11-01), Nakajima et al.
patent: 5177053 (1993-01-01), Nagura et al.
patent: 5182161 (1993-01-01), Noda et al.

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