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US 4,397,997 AGranted
Ultraturbulent coupling of polymeric diazonium salts
AssigneeDynapol
InventorsDaniel J. Dawson, Phillip J. Brock
Life of this patent
Estimating the term…
Abstract
Polymeric diazonium salts are coupled to coupling agents without complications of precipitation by injecting a diazonium salt solution into a substantial volume excess of the coupling agent solution immediately adjacent to the impellor of a centrifugal pump or the like.
Claims9
The process for coupling a slow-reacting coupling agent to a polymeric diazonium salt which comprises:
- a. circulating via a centrifugal pump a first stream of an alkaline aqueous solution containing a predetermined quantity of said coupling agent and
- b. injecting into said first stream immediate to the impellor of said centrifugal pump a second stream of an acidic aqueous solution containing from 1 to 15% by weight of said polymeric diazonium salt, the volume of flow of said first stream being not less than 45 times that of said second stream and the molar equivalents of coupling agent being at least 1.0 times the total molar equivalents of polymeric diazonium salt.
Dependencies are inferred from the claim text.