Soluble or crosslinked graft copolymers of lignin acrylamide and

Details Soluble or crosslinked graft copolymers of lignin acrylamide and Soluble or crosslinked graft copolymers of lignin acrylamide and

1990-11-08

1991-08-06

Nielsen, Earl

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

Synthetic resins

From lignin, tannin, or derivative reactant

C08H 502

Patent

active

050379313

ABSTRACT:
A soluble or crosslinked graft copolymer of lignin-(2-propenamide)-(2-methyl-3-oxo-4-oxyhex-1-ene-6-ol) having a central lignin network and at least one grafted side chain, R, having randomly repeating units of the formula: ##STR1## such that the central lignin network has a molecular weight of about 1,000 to 150,000 and the total number of randomly repeating units in the grafted side chain or chains is in the range of 1 to 300,000, such that the total copolymer molecular weight is in the range of 1,000 to 30,000,000 for use as thickeners for water and aqueous solutions and may be advantageously used in the recovery of oil from subterranean wells, in the preparation and use of drilling fluid compositions, or in plastics and elastomers.

REFERENCES:
patent: 4374738 (1983-02-01), Kelley
patent: 4687828 (1987-08-01), Meister et al.

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