AQUEOUS POLY(HYDROXYALKANOIC ACID) SUSPENSION AND PRODUCTION METHOD THEREFOR

• Main Authors: FUJITA, Masayuki, KUSAKABE, Itsuki, OKADA, Yasunori
• Format: Patent
• Language: English; French; Japanese
• Published: 28.09.2023
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; IMPREGNATING OR COATING OF PAPER; INKS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; USE OF MATERIALS THEREFOR; WOODSTAINS

Provided is a method for producing an aqueous poly(hydroxyalkanoic acid) suspension, the method comprising a step in which hydrogen peroxide is added to an aqueous poly(hydroxyalkanoic acid) suspension having a pH of 5 or less. Preferably, the addition amount of the hydrogen peroxide is 0.1-1 wt% with respect to solid components including the poly(hydroxyalkanoic acid). Preferably, the number of bacterial cells in the aqueous suspension after the addition of hydrogen peroxide is 4×102 per ml or less. Preferably, the aqueous suspension has a concentration of the solid components including the poly(hydroxyalkanoic acid) of 20-60 wt%. L'invention concerne un procédé de production d'une suspension aqueuse d'un poly(acide hydroxyalcanoïque), le procédé comprenant une étape dans laquelle du peroxyde d'hydrogène est ajouté à une suspension aqueuse d'un poly(acide hydroxyalcanoïque) ayant un pH de 5 ou moins. De préférence, la quantité ajoutée du peroxyde d'hydrogène est de 0,1 à 1 % en poids par rapport aux constituants solides, y compris le poly(acide hydroxyalcanoïque). De préférence, le nombre de cellules bactériennes dans la suspension aqueuse après addition du peroxyde d'hydrogène est de 4×102 par ml ou moins. De préférence, la concentration des constituants solides, y compris le poly(acide hydroxyalcanoïque), dans la suspension aqueuse est de 20 à 60 % en poids. ｐＨが５以下のポリヒドロキシアルカン酸水性懸濁液に対して、過酸化水素を添加する工程を含む、ポリヒドロキシアルカン酸水性懸濁液の製造方法を提供する。好ましくは、過酸化水素の添加量が、前記ポリヒドロキシアルカン酸を含む固形分に対し０．１～１重量％である。好ましくは、過酸化水素添加後の水性懸濁液中の細菌数が４×１０２個／ｍｌ以下である。好ましくは、水性懸濁液中の、ポリヒドロキシアルカン酸を含む固形分の濃度が２０～６０重量％である。