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    • 7. 发明申请
    • Method For Producing Aqueous Ethylene/Vinyl Alcohol Based Copolymer Dispersion
    • 乙烯基乙烯醇共聚物分散体的制备方法
    • US20080176989A1
    • 2008-07-24
    • US11596355
    • 2005-05-13
    • Norihiro SugiharaYuhei Funabiki
    • Norihiro SugiharaYuhei Funabiki
    • C08L33/02C08L23/08C08L29/02
    • C08J3/05C08J2323/08C08J2329/04
    • It is the object of the present invention to provide a method of producing, in an industrially advantageous manner, an ethylene/vinyl alcohol copolymer aqueous dispersion which has a high concentration and is excellent in long-term storage stability and in which the resin particles in the aqueous dispersion obtained are small in particle diameter.The present invention is a method of producing an ethylene/vinyl alcohol copolymer aqueous dispersion, which comprises: (1) a step of dissolving an ethylene/vinyl alcohol copolymer in a mixed solvent comprising 5 to 65% by weight of water and 35 to 95% by weight of a water-soluble organic solvent, with heating, (2) a step of cooling a solution obtained in said step to precipitate the ethylene/vinyl alcohol copolymer, (3) a step of reducing a concentration of the water-soluble organic solvent in said mixed solvent to a level lower than 35% by weight relative to the total amount of the water and water-soluble organic solvent by adding water, and (4) a step of distilling off said water-soluble organic solvent.
    • 本发明的目的是提供以工业上有利的方式生产具有高浓度并且长期保存稳定性优异的乙烯/乙烯醇共聚物水分散体的方法,其中树脂颗粒在 得到的水分散体的粒径小。 本发明是一种生产乙烯/乙烯醇共聚物水分散体的方法,其包括:(1)将乙烯/乙烯醇共聚物溶解在包含5至65重量%的水和35至95的混合溶剂中的步骤 (2)冷却所述步骤中得到的溶液以沉淀乙烯/乙烯醇共聚物的步骤,(3)降低水溶性的浓度的步骤 所述混合溶剂中的有机溶剂相对于水和水溶性有机溶剂的总量相对于水的总量为35重量%,和(4)蒸馏除去所述水溶性有机溶剂的步骤。