Method for reducing thermal and light-induced brightness reversi

Details Method for reducing thermal and light-induced brightness reversi Method for reducing thermal and light-induced brightness reversi

1993-08-25

1994-11-01

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

162158, 162160, 1621812, 10628723, 106465, 106506, 427395, D21H 1705

Patent

active

053605152

ABSTRACT:
A method and article of manufacture thereof is provided for reducing brightness reversion in bleached lignin-containing pulps or newsprint by the treatment of the bleached lignin-containing pulp or newsprint with 2,5-dihydroxydioxane. In one embodiment, calcium carbonate is added to enhance the activity of 2,5-dihydroxydioxane.

REFERENCES:
patent: 4871423 (1989-10-01), Grimsley et al.
patent: 5043017 (1991-08-01), Passaretti
patent: 5080754 (1992-01-01), Francis et al.
patent: 5156719 (1992-10-01), Passaretti
Tschirner and Dence, "Attemps to photostabilize Norway spruce TMP by chemical modification" Paper and Timber 4, 338-346 (1988).
Janson and Forssk.ang.hl, "Color changes in lignin-rich pulps on irradiation by light" Nordic Pulp & Paper Research Journal 4, 197-205 (1989).
Gellerstedt et al., "Light-induced and heat-induced yellowing of mechanical pulps" Svensk Papperstidning, R157-163 (1983).
Ratto et al. "Photostabilization of Mechanical pulps by polyvinylpyrrolidone" Tappi Journal 76, 67-70 (1993).

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