Soluble for crosslinked graft copolymers of lignin based on hydr

Details Soluble for crosslinked graft copolymers of lignin based on hydr Soluble for crosslinked graft copolymers of lignin based on hydr

1989-09-18

1992-06-16

Bleutge, John C.

Wells

Processes

Producing foam or gas in well by foaming or gas producing...

527400, 524799, 166268, E21B 4300

Patent

active

051218011

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.
patent: 4889902 (1989-12-01), Meister

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