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    • 4. 发明申请
    • POLYVINYL ACETAL SHEET AND PROCESS FOR PRODUCTION THEREOF
    • 聚乙烯薄膜及其生产方法
    • US20100086788A1
    • 2010-04-08
    • US12446824
    • 2007-07-27
    • Tsuyoshi TsujiMasanobu KohsakaShigeharu YoshiiTomoo SaitoYoshihiro Mashiko
    • Tsuyoshi TsujiMasanobu KohsakaShigeharu YoshiiTomoo SaitoYoshihiro Mashiko
    • B32B17/10C08G63/91C08L29/04C08K5/101
    • C08J5/18B29C48/001B29C48/08B29C48/297B29K2105/0038B32B17/10577B32B17/10761C08F8/48C08J2329/14Y10T428/3163C08F8/28C08F16/06
    • Provided are a polyvinyl acetal sheet which is excellent in adhesion to glass, easy in control of adhesion, little colored, highly transparent and excellent in penetration resistance even under high-temperature conditions when the sheet is used for laminated glass or the like, a process for its production and a process for producing polyvinyl acetal particles used for the sheet.The polyvinyl acetal sheet is produced by molding polyvinyl acetal particles into a sheet with a degree of acetalization of from 75.0 to 84.0 mass % and with a porosity of from 60 to 85%. The polyvinyl acetal particles are preferably produced by an acetalization reaction of 100 parts by mass of a polyvinyl alcohol and from 40 to 75 parts by mass of an aldehyde in the presence of an acid catalyst at a reaction temperature of from 20 to 60° C., and the acetalization reaction comprises supplying the polyvinyl alcohol, the aldehyde and the acid catalyst to a reactor to bring about acetalization, discharging a reaction mixture from the reactor after the degree of acetalization of the produced polyvinyl acetal has reached 13 mass %, and subjecting the discharged reaction mixture to an aging reaction.
    • 提供一种聚乙烯醇缩醛片,其在与玻璃的粘合性方面优异,即使在片材用于夹层玻璃等时,也可以在高温条件下,易于控制粘合性,少着色,高透明性和优异的耐渗透性, 用于制造用于片材的聚乙烯醇缩醛颗粒的方法。 聚乙烯醇缩醛片通过将聚乙烯醇缩醛粒子成型为缩醛化度为75.0〜84.0质量%,孔隙率为60〜85%的片材来制造。 聚乙烯醇缩醛粒子优选通过在酸催化剂的存在下,在20〜60℃的反应温度下,通过100质量份聚乙烯醇和40〜75质量份的醛的缩醛化反应来制造。 并且缩醛化反应包括将聚乙烯醇,醛和酸催化剂供应到反应器进行缩醛化,在所生产的聚乙烯醇缩醛的缩醛化程度达到13质量%后,将反应混合物从反应器中排出, 排出的反应混合物进行老化反应。