Process for making graft copolymers from lignin and vinyl monome

Details Process for making graft copolymers from lignin and vinyl monome Process for making graft copolymers from lignin and vinyl monome

1990-02-14

1992-08-11

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From lignin, tannin, or derivative reactant

527403, C08H 502

Patent

active

051380072

ABSTRACT:
The invention provides a series of methods for synthesizing a lignin graft copolymer or modifying the surface of a wood fiber or pulp and to provide a spectrum of reagents to use in the processes for preparing the lignin graft copolymer, grafted wood, grafted wood fiber, or grafted pulp and to provide a method of boosting or enhancing polymer molecular weights during polymerization reactions.
In accordance with the present invention, to the lignin macromolecule, possibly to the aromatic ring of the oxyphenylpropene moiety, is grafted 1) repeating units of 1-(pendant group)ethylene: ##STR1## 2) a combination of randomly occurring repeating units of 1-(pendant group)ethylene with 1-(alternate pendant group)ethylene: ##STR2## 3) a combination of randomly occurring repeating units of 1-methyl-1-(pendant group)ethylene with 1-(alternate pendant group)ethylene: ##STR3## or 4) a combination of randomly occurring repeating units of 1-methyl-1-(pendant group)ethylene with 1-methyl-1-(alternate pendant group)ethylene: ##STR4## In these formulas, m and n are integers varying from 1 to 300,000. R.sub.1 and R.sub.2 are organic functional groups which do not interfere with free radical polymerization, and the structures presented represent typical polymer or random-sequence, copolymer sidechains attached to lignin by the process of this invention.

REFERENCES:
patent: 4687828 (1987-08-01), Meister et al.
patent: 4871825 (1989-10-01), Lin
patent: 4889902 (1989-12-01), Meister
patent: 4931527 (1990-06-01), Meister
patent: 4940764 (1990-07-01), Meister
patent: 4988576 (1991-01-01), Lin et al.

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