the polypyrrolidone spinning process

摘要

Polypyrrolidone solutions having a bulk viscosity of 100-10,000 poises, and containing a solvent such as formic acid and a volatile diluent such as methylene chloride, are spun into filaments by extrusion through a spinneret. The solution contains, for example, about 5-40 weight percent of polypyrrolidone, about 30-90 weight percent of formic acid and about 5-60 weight percent of methylene chloride.