Copolymers useful as demulsifiers and clarifiers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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C524S556000, C526S303100, C526S318430, C526S319000, C526S330000, C526S335000, C526S336000, C526S346000

Reexamination Certificate

active

07470744

ABSTRACT:
A copolymer useful as a demulsifier or water clarifier may be prepared by polymerizing at least one aromatic monomer having one or more polymerizable double bonds; at least one oleophilic monomer having one or more polymerizable double bonds; at least one ionizable monomer having a polymerizable double bond; and at least one hydrophilic monomer having one or more polymerizable double bonds, under polymerization conditions sufficient to prepare a copolymer. The copolymer may, in some embodiments, be prepared and used as a latex.

REFERENCES:
patent: 3438800 (1969-04-01), Johnson
patent: 4469615 (1984-09-01), Tsuruoka et al.
patent: 5100582 (1992-03-01), Bhattacharyya
patent: 5239028 (1993-08-01), Nakagawa et al.
patent: 6025426 (2000-02-01), Hurlock
patent: 6190561 (2001-02-01), Nagan
patent: 6646086 (2003-11-01), Sloan
patent: 7115682 (2006-10-01), Guo et al.
patent: 7160970 (2007-01-01), Creamer et al.
patent: 08188989 (1996-07-01), None

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