# US 4,393,163 A · Method for stabilizing an acrylamide polymer in a petroleum recovery process

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- Number: US 4,393,163 A
- Document ID: US4393163A
- Status: Granted
- Kind: A
- Application number: 06/101,672
- Filed: 1979-12-10
- Granted: 1983-07-12
- Earliest claimed: 1977-12-14
- Assignees: Nitto Chemical Industry Co., Ltd.
- Inventors: Shoichi Kanda; Gengiro Kawamura
- Web page: https://patentgrep.com/patent/US4393163A

## CPC

- C08K 5/37: Thiols
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

2-Mercaptobenzoimidazole or its water-soluble salt is added to a water-soluble acrylamide polymer containing a predominant amount of acrylamide in the molecule to inhibit degradation, especially at high temperatures, in a petroleum recovery process.

## Claims

### Claim 1

An aqueous solution of an acrylamide polymer stabilized for use in a petroleum recovery process comprising a partially hydrolyzed polyacrylamide, water, and a stabilizing effective amount of 2-mercaptobenzoimidazole or a water-soluble salt thereof having the general formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents a hydrogen atom or a lower alkyl group, and X represents a hydrogen atom, an alkali metal atom or an ammonium group.