Method for preventing yellowing of lignocellulosic products

Details Method for preventing yellowing of lignocellulosic products Method for preventing yellowing of lignocellulosic products

1995-04-20

1997-08-19

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

162158, 162160, 1621641, 427391, 25230121, 252407, D21H 1736

Patent

active

056584318

ABSTRACT:
The invention relates to a method for protecting lignocellulosic material against yellowing caused by light or heat. The invention further concerns brightness stabilizing compositions intended for treatment of lignocellulosic materials. According to the invention, polytetrahydrofuran (PTHF) is used as the brightness stabilizing agent. Preferably PTHF having a molar mass of about 150 to 1500 is used. The invention provides a good stabilization of lignocellulosic pulp and of products containing such pulp, whereby the amount of PTHF required can be extremely small, e.g., 0.05-5% of the weight of the material.

REFERENCES:
patent: 3674632 (1972-07-01), Wennergren et al.
patent: 4474919 (1984-10-01), Polatajko-Lobos

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