Loss of chromosomal integrity in human mammary Soslow

A synthetic fibre comprising a mixture of (a) polyvinyl chloride, polyvinylidene chloride or a copolymer thereof and (b) a crystalline isotactic polystyrene is prepared by dissolving components (a) and (b) in a solvent and extruding the resulting spinning solution. The solvent may be tetrahydrofuran (optionally together with toluene) or cyclohexane. The extruded filament may be stretched.