Polymerization of caprolactam with certain quaternary ammonium compounds

A process for the polymerization of caprolactam, comprising preparing a stock solution of the potassium salt of caprolactam in N-methyl pyrrolidone, adding an aliquot portion of said stock solution to a substantially similar quantity of caprolactam to form an initial mixture, blending said initial mixture,

• adding to said initial mixture a lesser amount of an accelerator selected from the group consisting of methyl tributyl ammonium chloride, tetramethyl ammonium chloride, and methyl triethyl ammonium chloride and mixtures thereof to form a secondary mixture, and
• maintaining said secondary mixture at a temperature between about room temperature and about 115.degree. C. to form a solid polymer of nylon-6.

A process for the polymerization of caprolactam to a nylon-6 polymer, comprising the use of a polymerization accelerator selected from the group consisting of methyl tributyl ammonium chloride and methyl triethyl ammonium chloride.