Polyacrylonitriles with a low K value, a process for their prepa

Details Polyacrylonitriles with a low K value, a process for their prepa Polyacrylonitriles with a low K value, a process for their prepa

1987-06-26

1988-07-26

Henderson, Christopher

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

5253291, C02F 100

Patent

active

047598530

ABSTRACT:
A method of inhibiting scale formation or precipitation in an aqueous alkaline-earth salt solution with an aqueous solution of a hydrolyzed polyacrylonitrile salt made by heating homopolymers and copolymers of acrylonitrile with very low Fikentscher K values of 34-15 and a total content of sulfonate and sulfate end groups, which do not originate from correspondingly substituted comonomers, of 250 to 1,000 milliequivalents per kilogram of polymer, 180 to 900 milliequivalents per kilogram being in the form of sulfonate end groups, and to suitable semi-continuous or continuous precipitation polymerization process for their preparation by means of a redox system in an aqueous medium.

REFERENCES:
patent: 4504643 (1985-03-01), Boutin

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