PROCEDE DE PREPARATION DE FIBRES CREUSES ET MICROPOREUSES

• Main Author: JOHN W. SOEHNGEN ET JOHN C. CHEN
• Format: Patent
• Language: French
• Published: 30.01.1981
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; 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; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY; GENERAL PROCESSES OF COMPOUNDING; HUMAN NECESSITIES; HYGIENE; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; MEDICAL OR VETERINARY SCIENCE; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

LA PRESENTE INVENTION SE RAPPORTE A UN PROCEDE DE PREPARATION DE FIBRES CREUSES ET MICROPOREUSES.SELON L'INVENTION, ON ETIRE AU SOLVANT UNE FIBRE CREUSE ET NON POREUSE COMME PRECURSEUR, AYANT UN DEGRE CONTROLE D'ORIENTATION MOLECULAIRE MESURE PAR BIREFRINGENCE. LE CONTROLE DE L'ORIENTATION DONNE UNE FIBRE CREUSE ET MICROPOREUSE AYANT UN MEILLEUR EQUILIBRE DE RESISTANCE MECANIQUE ET DE PERMEABILITE.L'INVENTION S'APPLIQUE NOTAMMENT A LA FILTRATION. The present invention provides a process for preparing microporous hollow fibers by solvent stretching a non-porous hollow precursor fiber having a controlled degree of molecular orientation as measured by birefringence. Control of the precursor fiber orientation, yields a microporous hollow fiber having an improved balance of mechanical strength and permeability.