D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 19/62 (2006.01) D21H 17/06 (2006.01) D21H 17/53 (2006.01) D21H 19/24 (2006.01) D21H 19/46 (2006.01) D21H 21/14 (2006.01)
Patent
CA 2146944
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.
Forsskahl Ingegerd
Janson Jan
Korhonen Taina
Gowling Lafleur Henderson Llp
Oy Keskuslaboratorio - Centrallaboratorium Ab
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