Patent ID: 11879095
Assignee: KEMIRA OYJ
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 6:
7. An oil or gas containing aqueous environment which comprises a composition, wherein said composition comprises an aqueous solution or aqueous composition comprising at least one polymer having no charge prior to introduction into the oil or gas containing aqueous environment or an initial anionic charge of less than 25 mol % and further comprising one or more labile monomer units, which at least one polymer is not cross-linked when introduced into the oil or gas containing aqueous environment and which at least one polymer increases in charge over a duration of 1-100 months when present in the oil or gas containing aqueous environment as a result of said one or more labile monomer units being broken or hydrolyzed by reaction with water in the oil or gas containing aqueous environment, thereby forming one or more carboxylates, thereby providing for an increase in viscosity of said aqueous solution or aqueous composition comprising said at least one polymer present in said oil or gas containing aqueous environment.