METHOD FOR PRODUCING WATER-ABSORBING POLYMER PARTICLE HAVING HIGH PERMEABILITY BY POLYMERIZATION OF DROPLETS OF MONOMER SOLUTION

• Main Authors: VOLKER SEIDL, MARCO KRUAER, FUNK RUEDIGER, HILLEBRECHT ANNEMARIE, STUEVEN UWE, STEFAN BLEI, WILFRIED HEIDE, WEISMANTEL MATTHIAS, LOSCH DENNIS
• Format: Patent
• Language: English; Japanese
• Published: 25.12.2014
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for producing water-absorbing polymer particles having high permeability, that is, high liquid permeability in a swollen gel bed.SOLUTION: There is provided a method for producing water-absorbing polymer particles having high permeability by polymerization of droplets of a monomer solution in a gas phase surrounding the droplets, wherein the monomer solution contains at least 0.5 mass% of a crosslinking agent relative to the monomer, the polymerization is carried out at a homogeneous phase in the droplets and the polymer particles have an average diameter of at least 150 μm. 【課題】高い透過性、すなわち膨潤ゲルベッド中での高い液体通過性を有する吸水性ポリマー粒子の製造方法を提供する。【解決手段】モノマー溶液の液滴の重合によって該液滴を取り囲む気相中で、高い透過性を有する吸水性ポリマー粒子を製造する方法において、前記モノマー溶液がモノマーに対して少なくとも０．５質量％の架橋剤を含有し、重合を液滴中で均質相で行い、かつ前記ポリマー粒子が少なくとも１５０μｍの平均直径を有する方法によって解決される。【選択図】なし