son and copolymeres film of acrylonitrile is comportantpas vacuoles

摘要

Threads and films of acrylonitrile copolymers which contain 20 to 80 percent by weight of vinylidene chloride and/or vinyl chloride, which threads and films are free from vacuoles. The formation of vacuoles in threads or films of copolymers of acrylonitrile containing 20 to 80 percent by weight of vinylidene chloride and/or vinyl chloride can be substantially reduced or even completely prevented by adding homopolymers of vinyl methyl formamide or copolymers of vinyl methyl formamide with up to 90 mols percent of vinyl esters or acrylic acid esters to the spinning solutions of acrylonitrile copolymers and organic solvents in an amount of 0.5 to 20 percent by weight, based on the copolymer of acrylonirile and vinylidene chloride and/or vinyl chloride.