Hot-melt adhesives of partially saponified vinyl ester copolymers
    1.
    发明授权
    Hot-melt adhesives of partially saponified vinyl ester copolymers 失效
    部分皂化乙烯基酯共聚物的热熔粘合剂

    公开(公告)号:US4678832A

    公开(公告)日:1987-07-07

    申请号:US667069

    申请日:1984-11-01

    摘要: A resin-like product having a degree of hydrolysis of 50 to 70 mole percent is obtained by selective alcoholysis of a vinyl ester copolymer, if desired in the form of a mixture with a vinyl ester homopolymer. The starting material employed is preferably a vinyl acetate/crotonic acid copolymer. The resin is suitable for use as a hot-melt adhesive which forms coherent films capable of being activated by water or water vapor.

    摘要翻译: 通过乙烯基酯共聚物的选择性醇解可以得到水解度为50-70%(摩尔)的树脂状产品,如果需要,则与乙烯基酯均聚物混合形式。 所使用的原料优选为乙酸乙烯酯/巴豆酸共聚物。 该树脂适用于形成能够被水或水蒸气活化的粘合膜的热熔粘合剂。

    Open-cell shaped article made of acetalized polyvinyl alcohol and
process for its manufacture
    2.
    发明授权
    Open-cell shaped article made of acetalized polyvinyl alcohol and process for its manufacture 失效
    由缩醛化聚乙烯醇制成的开孔型制品及其制造方法

    公开(公告)号:US4296210A

    公开(公告)日:1981-10-20

    申请号:US211332

    申请日:1980-11-26

    IPC分类号: C08J9/00 C08J9/30 C08J9/36

    摘要: The acetalization of polyvinyl alcohol in an acidic aqueous medium in the presence of a wetting agent yields an open-cell, solid foam when the reaction medium contains gas bubbles which are preferably produced by stirring air into the reaction mixture. By carrying out the acetalization in the presence of a nucleic acid a porous shaped article is obtained in which the cells are uniformly distributed. The dried shaped article absorbs a multiple of its weight of water. It can be used for household and industrial purposes.

    摘要翻译: 在润湿剂存在下,酸性水性介质中的聚乙烯醇缩醛化产生了开孔,固体泡沫,当反应介质含有气泡时,优选通过将空气搅拌到反应混合物中而产生。 通过在核酸存在下进行缩醛化,得到多孔成形制品,其中细胞均匀分布。 干燥的成型制品吸收其重量的重量。 它可以用于家庭和工业目的。

    Open-pore molded article based on polyvinyl acetals, and a process for
its preparation
    3.
    发明授权
    Open-pore molded article based on polyvinyl acetals, and a process for its preparation 失效
    基于聚乙烯醇缩醛的开孔模制品及其制备方法

    公开(公告)号:US4430447A

    公开(公告)日:1984-02-07

    申请号:US429035

    申请日:1982-09-30

    摘要: When polyvinyl alcohol and vinyl acetate/ethylene copolymers are acetalized in an acid aqueous medium in the presence of a wetting agent, an open-pore solid foam is formed, if the reaction mixture contains gas bubbles. These gas bubbles are produced, in particular, by stirring in air. The molded articles obtained are porous, and the pores are uniformly distributed. The dried molded article absorbs many times its weight of water. It is employed as a sponge for household use and in industry.

    摘要翻译: 当聚氨酯和乙酸乙烯酯/乙烯共聚物在酸性水介质中在润湿剂存在下进行缩醛化时,如果反应混合物含有气泡,则形成开孔固体泡沫。 这些气泡特别是通过在空气中搅拌而产生。 得到的成型品多孔,孔均匀分布。 干燥的模制品吸收其重量的许多倍。 它被用作家用和工业上的海绵。

    Process for the preparation of a polyvinyl alcohol complex compound in
the presence of an organic boric acid derivative
    5.
    发明授权
    Process for the preparation of a polyvinyl alcohol complex compound in the presence of an organic boric acid derivative 失效
    在有机硼酸衍生物存在下制备聚乙烯醇络合物的方法

    公开(公告)号:US4331781A

    公开(公告)日:1982-05-25

    申请号:US223811

    申请日:1981-01-09

    CPC分类号: C08F8/14 C08F8/42

    摘要: With polybasic inorganic acids, for example boric acid, polyvinyl alcohol forms complex compounds, which, in the form of a gel, are suitable as adhesives. PVAL complex compounds are prepared in simple manner by subjecting to alcoholysis a polyvinyl ester in the presence of an organic boric acid derivative complexing agent. The reaction is carried out in alcoholic solution and the complexing agent should be soluble in alcohol. As starting material polyvinyl acetate is preferred, and methanol is preferred as alcohol. The PVAL complex compounds prepared in this way are used, inter alia, as binders and thickening agents for coating substances.

    摘要翻译: 对于多元无机酸,例如硼酸,聚乙烯醇形成复合化合物,其以凝胶的形式适合作为粘合剂。 通过在有机硼酸衍生物络合剂的存在下进行醇解聚乙烯酯,以简单的方式制备PVAL络合物。 反应在醇溶液中进行,络合剂应溶于乙醇。 作为原料,优选聚乙酸乙烯酯,优选甲醇作为醇。 以这种方式制备的PVAL络合物尤其用作用于涂覆物质的粘合剂和增稠剂。