Water soluble graft copolymers of lignin-(2-propenamide)-(sodium

Details Water soluble graft copolymers of lignin-(2-propenamide)-(sodium Water soluble graft copolymers of lignin-(2-propenamide)-(sodium

1985-08-30

1987-08-18

Lieberman, Allan M.

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

Synthetic resins

From lignin, tannin, or derivative reactant

527401, C08L 9700, C08H 502

Patent

active

046878289

ABSTRACT:
A water-soluble graft copolymer of lignin-(2-propenamide)-(sodium 2,2-dimethyl-3-imino-4-oxohex-5-ene-1-sulfonate) 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 100,000 and the total number of randomly repeating units in the grafted side chain or chains is in the range of 1,000 to 300,000, such that the total copolymer molecular weight is in the range of 40,000 to 30,000,000.
The copolymers of the present invention are useful as thickeners for water and aqueous solutions and may be advantageously used in the recovery of oil from subterranean wells or in the preparation and use of drilling fluid compositions.

REFERENCES:
patent: 3388061 (1968-06-01), Markham
patent: 3912706 (1975-10-01), Rachor et al.

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