Process for producing high molecular weight acrylonitrile polymers
AssigneeJapan Exlan Company Limited
InventorsToshiyuki Kobashi, Shoyo Takagi
Life of this patent
Estimating the term…
Abstract
In the suspension polymerization of acrylonitrile in an aqueous medium, the polymerization is conducted in the presence of a water-soluble polymer and an oil soluble radical initiator while maintaining the acrylonitrile concentration higher than 9 weight percent in the polymerization system, whereby the polymerization of acrylonitrile in the water phase is suppressed and a high molecular weight polymer (weight average molecular weight not less than 400,000) having uniform particle diameters is produced.
Claims9
A method of producing a high molecular weight acrylonitrile polymer having a weight average molecular weight not less than 400,000, characterized by suspension-polymerizing at a temperature of from 20.degree. to 80.degree. C., acrylonitrile alone or a monomer mixture compound of more than 85 weight % acrylonitrile and at least one other ethylenically unsaturated monomer which forms the remainder, in an aqueous medium containing a water-soluble polymer and an oil-soluble radical initiator, under the conditions that an acrylonitrile concentration higher than 9 weight % is maintained in the polymerization system, and wherein the effect of stirring imparted to the polymerization system is 1-10 KWH/m.sup.3 in terms of the power required for stirring.
Dependencies are inferred from the claim text.