Lignin derivatives, moldings produced by using the derivative, and process for the preparation thereof
AssigneesKabushiki Kaisha Maruto, Recruit Co., Ltd.
InventorMasamitsu Funaoka
Life of this patent
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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.
Claims41
A method of making a cross-linked material comprising:
- (a) solvating lignin in ligno-cellulose material with phenol and/or a phenol derivative having at least one unsubstituted ortho-position or para-position with respect to a hydroxyl group of a phenol group,
- (b) contacting the solvated lignin with concentrated acid, thereby forming a carbon-carbon bond between the at least one unsubstituted ortho-position or para-position of the phenol or the phenol derivative and a benzyl position of a phenylpropane unit of the lignin and forming cleavages of benzyl-aryl ether bonds, whereby a lignophenol derivative having a plurality of diphenylpropane units is formed, and
- (c) contacting the lignophenol derivative with at least one cross-linking compound selected from an aldehyde and a diisocyanate under alkaline conditions that will dissociate the phenolic hydroxyl group, thereby forming a cross-linking lignin-based polymer by introducing a cross-linking functional group at the ortho-position, the para-position or both the ortho-position and para-position with respect to the phenolic hydroxyl group of the diphenylpropane unit.
A cross-linking lignin based polymer having a plurality of diphenylpropane units, wherein an ortho-position or para-position of a phenol or a phenol derivative is bound via a carbon-carbon bond to a benzyl position of a phenylpropane unit of lignin and at least one cross-linking functional group having a hydroxylmethyl group is bound to an ortho-position and/or a para-position with respect to a phenolic hydroxyl group within the diphenylpropane unit.
Dependencies are inferred from the claim text.