C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
402/2, 31/22, 40
C08K 5/16 (2006.01) C08F 8/00 (2006.01) C08J 3/24 (2006.01) C08K 5/20 (2006.01) C09K 8/68 (2006.01) C09K 8/72 (2006.01)
Patent
CA 1189237
ABSTRACT OF THE DISCLOSURE The present invention relates to macromolecular compositions crosslinked by a novel bridge having the formula -NRx-CH=N-CO-. This novel bridge is obtained by reacting a macro-molecule, preferably a polymer, having at least two amidocarbonyl groups with a compound having at least two formylamido groups in an aqueous medium under highly acidic conditions. The crosslinking bridge formed by the reaction of this invention is produced in accord with the following formula: Image Compositions containing macromolecules having at least two amidocarbonyl groups and a compound having at least two formylamido groups can act as vicosifying or gelling agents for aqueous acids where when added to aqueous acids, crosslinking occurs. Acids gelled in this manner have important use in the recovery of oil and natural gas from subterranean formations.
392237
Balzer Juliane
Dawson Jeffrey C.
Engelhardt Friedrich
Piesch Steffen
Cassella Aktiengesellschaft
Dresser Industries Inc.
Fetherstonhaugh & Co.
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