Quaternary ammonium catalyst system for the polymerization of 2-pyrrolidone
AssigneeChevron Research Company
InventorRobert Bacsksai
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Abstract
The process of making a catalyst for the polymerization of 2-pyrrolidone by contacting an alkali metal pyrrolidonate, a quaternary ammonium halide and carbon dioxide in a mol ratio of about 1:0.1-2:0.1-0.5. The alkali metal pyrrolidonate may be prepared by reacting an alkali metal hydroxide with 2-pyrrolidone. The polymerization of 2-pyrrolidone in the presence of this catalyst system produces poly-2-pyrrolidone of high molecular weight.
Claims9
A process for polymerizing 2-pyrrolidone to form a polymer suitable for forming fibers in a polymerization reaction zone which comprises contacting the 2-pyrrolidone with a catalyst comprising potassium pyrrolidonate, tetra alkyl ammonium halide and carbon dioxide in a mol ratio of 1:0.1-2:0.1-0.5 and wherein the water content in the reaction zone does not exceed about 0.1-0.2 weight percent based on total 2-pyrrolidone feed.
Dependencies are inferred from the claim text.