MELT-SPINNING OF ACRYLONITRILE POLYMER

• Main Authors: TSUNODA ATSUSHI, ONO KEIZO, MIZUGUCHI TOYOKAZU
• Format: Patent
• Language: English
• Published: 24.10.1989
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP

PURPOSE:To obtain the subject fiber having void-free dense texture and excellent strength and dyeability, without using water and a plasticizer, by emulsion- polymerizing an acrylonitrile-type unsaturated monomer, subjecting the resultant polymer to coagulation, washing with water and drying and extruding the product in molten state with pressure under specific condition. CONSTITUTION:A polymer having a relative viscosity of 1.4-1.9 is produced by the emulsion polymerization of unsaturated monomers composed mainly of 70-95mol% of acrylonitrile and 5-30mol% of a monomer copolymerizable with said acrylonitrile [e.g. (meth)acrylic acid or methyl (meth)acrylate]. The obtained polymer is coagulated, washed with water and dried by conventional method. The objective fiber is produced by extruding the dried product at 190-280 deg.C, preferably 210-260 deg.C in molten state under pressure into atmosphere of normal temperature while keeping the residence time of the polymer in the heating part of the extruder to 1-10min, preferably 1-5min.