Inhibition of photo-yellowing in paper

Details Inhibition of photo-yellowing in paper Inhibition of photo-yellowing in paper

1997-01-15

1999-07-27

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162158, 162173, 162135, 1621816, 1621818, 10616301, D21H 1706

Patent

active

059284730

ABSTRACT:
The present invention relates to a method for the inhibition of photo-yellowing in paper rich in lignin by treatment of pulp or paper rich in lignin with a compound containing hydroxy functionalities that are capable of forming a ketal with a carbonyl group in an acidic environment. In a preferred embodiment the acidic environment is provided by the presence of an acidic clay or an acidic zeolite.

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patent: 3607621 (1971-09-01), Wasko et al.
patent: 4830673 (1989-05-01), Jones et al.
patent: 5342538 (1994-08-01), Chung et al.
patent: 5658431 (1997-08-01), Janson et al.
Smook, Handbook for Pulp & Paper Technologists, 2nd ed., Vancouver, B.C.: Angus Wilde Publications, p. 41, 1992.
Smook, Handbook of Pulp & Paper Terminology, Vancouver, B.C.: Angus Wilde Publications, p. 51, 1990.
Leary, G. L. Recent Progress in Understanding and Inhibiting the Light--Induced Yellowing of Mechanical Pulps, J. Pulp Paper Sci., vol. 20(4), J154 -J160 (1994).
T. W. Greene and P. G. M. Wuts. Protective Groups In Organic Synthesis 2nd Ed.; J. Wiley and Sons, 1991, Chapter 4; 175-223.

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