Acetylation of lignocellulosic materials

Bleaching and dyeing; fluid treatment and chemical modification – Chemical modification of textiles or fibers or products thereof – Cellulose fibers

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427212, 427440, D06M 114, D06M 1320, B05D 118, B05D 700

Patent

active

048043842

ABSTRACT:
Reaction of lignocellulosic material with uncatalyzed acetic anhydride in the absence of any cosolvent is disclosed. The process improves dimensional stability and resistance to biological attack of the lignocellulosic material. Lignocellulosic material is treated by exposure to liquid acetic anhydride for at least a short period of time, after which it is then heated to acetylate the material. The excess anhydride and byproduct acetic acid can be removed by vacuum.

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Dimensional Stabilization of Harelboard by Acetylation Klinga, L. O et al. Tappi vol. 49, No. 1 Jan. 1966.

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