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    • 10. 发明授权
    • Finely divided polyvinyl acetals, a process for their preparation, and
their use in baked coatings
    • 细分聚乙烯醇缩醛,其制备方法及其在烘烤涂料中的应用
    • US4499236A
    • 1985-02-12
    • US562218
    • 1983-12-16
    • Hans D. HermannUlrich M. Hutten
    • Hans D. HermannUlrich M. Hutten
    • C08F8/00B32B17/10C08F8/28C08F16/00C08F16/38C08L29/00C08L29/14C08L51/00C08L51/02C08L77/00C09D5/03C09D129/14D06M13/02D06M13/137D06M15/333
    • B32B17/10761C08F8/48
    • The invention relates to finely divided polyvinyl acetal which is prepared in the form of an aqueous suspension or, if desired, in powder form, preferably having average particle sizes from 0.5 to 10 .mu.m, from polyvinyl alcohol and at least one aliphatic aldehyde having at least 3 carbon atoms, and which contains 0.1 to 10% by weight, based on polyvinyl acetal, of a completely or partially hydrolyzed vinyl ester copolymer grafted onto polyethylene oxide or polyethylene oxide derivatives and acetalized in the mixture with the polyvinyl alcohol.The invention further relates to a process for preparing finely divided polyvinyl acetals having an average particle size between 0.5 and 10 .mu.m in an aqueous suspension or, if desired, by dewatering the suspension, in powder form, by reacting an aqueous solution of polyvinyl alcohol, in the presence of an acidic catalyst and in the absence or presence of emulsifiers, with at least one aliphatic aldehyde having at least 3 carbon atoms, which comprises performing the acetalization reaction in the presence of 0.1 to 10% by weight, based on the polyvinyl alcohol used, of a completely or partially hydrolyzed graft copolymer of vinyl ester on polyethylene oxide or polyethylene oxide derivatives.A further part of the subject-matter of the invention is the use of the finely divided polyvinyl acetals described above, in particular from a low-electrolyte or electrolyte-free aqueous suspension, preferably having an average particle size between 0.5 and 10 .mu.m, for baked coatings on any coatable substrates, in particular on metals.
    • 本发明涉及精细分散的聚乙烯醇缩醛,其以水性悬浮液或如果需要,以粉末形式制备,优选具有0.5至10μm的平均粒度,来自聚乙烯醇和至少一种脂族醛,其具有 至少3个碳原子,并且基于聚乙烯醇缩醛含有0.1至10重量%的全部或部分水解的乙烯基酯共聚物,其接枝到聚环氧乙烷或聚环氧乙烷衍生物上并与聚乙烯醇的混合物缩醛化。 本发明还涉及一种在水性悬浮液中制备平均粒度为0.5-10μm的细分聚乙烯醇缩醛的方法,或者如果需要,通过使粉末形式的悬浮液脱水,通过使聚乙烯醇的水溶液 在酸性催化剂的存在下,在不存在或不存在乳化剂的情况下,与至少一种具有至少3个碳原子的脂肪族醛进行缩合反应,该方法包括在0.1-10重量%的存在下,基于 使用的聚乙烯醇,乙烯基酯在聚环氧乙烷或聚环氧乙烷衍生物上的完全或部分水解的接枝共聚物。 本发明的主题的另一部分是使用上述细碎的聚乙烯醇缩醛,特别是使用低电解质或不含电解质的水性悬浮液,优选具有0.5-10μm的平均粒度, 用于任何可涂覆的基材,特别是金属上的烘烤涂层。