Lignin derivatives, molded products using the same and...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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C530S502000, C264S330000

Reexamination Certificate

active

11003212

ABSTRACT:
The present invention provides a process for producing novel lignin derivatives, which comprises using a lignophenol derivative containing a diphenylpropane unit formed by binding a carbon atom at an ortho-position relative to a phenolic hydroxyl group of a phenol derivative to a carbon atom at a benzyl-position of a phenylpropane fundamental unit of lignin, and binding an oxygen atom of the hydroxyl group and a β-positional carbon atom under alkali conditions under which the hydroxyl group can dissociate, to obtain an arylcoumaran derivative containing an arylcoumaran unit in which a coumaran skeleton is bound to an aromatic ring of lignin.

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Brunow, “On the Acid-catalysed Alkylation of Lignings,” Holzforschung, vol. 45, No. 1, pp. 37-40, 1991.
Ede et al., “Formic Acid/Peroxyformic Acid Pulping,” Holzforschung, vol. 43, No. 2, pp. 127-129,1989.
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M. Maeda, et al., “Construction of a Recyclable Formed Body by Mixing a Lignophenol Derivative with Cellular Fibers,” Nihon Mokuzai Gakkai Chubu Shibu Taikai, pp. 52-53 (Oct. 16, 1995) (with English translation).

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