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    • 3. 发明授权
    • Aqueous electrocoating baths for cathodic plant deposition and processes
for their preparation
    • 用于阴极植物沉积的水性电泳浴及其制备方法
    • US4944855A
    • 1990-07-31
    • US275085
    • 1988-09-23
    • Georg SchonGunter OttMichael Geist
    • Georg SchonGunter OttMichael Geist
    • C08G59/50C09D5/44C09D163/00C25D15/00
    • C09D5/4434C08G59/50
    • The invention relates to aqueous electrocoating baths for cathodic paint deposition which contain, as cathodically depositable binders, modified epoxide-amine adducts and are prepared by reacting, in the presence of basic amine catalysts,(1)(A) polyepoxides with(B) compounds which contain, per molecule, one or more, preferably 2, hydroxyl groups bonded to aromatic and/or (cyclo)aliphatic molecular fragments, to form epoxide group-containing intermediates, and(2) by subsequently reacting these intermediates, if appropriate, with further conventional modifiers and finally with(C) primary and/or secondary (poly)amines or their salts and/or salts of tertiary amines, the resultant reaction products being neutralized with acids, if appropriate, dispersed in an aqueous medium and these dispersions further processed by well-known methods to form electrocoating baths. The electrocoating baths according to the invention are distinguished by the fact that the basic amine catalyst which catalyzes the reaction between the components (A) and (B) is neutralized, prior to further reaction of the intermediates formed from the components (A) and (B), with a Bronsted acid having a pK.sub.s value of the first stage of dissociation, measured at 20.degree. C., below 3.7, preferably below 3.5.
    • PCT No.PCT / EP87 / 00130 Sec。 371日期:1988年9月23日 102(e)1988年9月23日PCT PCT 1987年3月7日PCT公布。 第WO87 / 05922号公报 日本1987年10月8日。本发明涉及用于阴极涂料沉积的含水电涂浴,其包含作为阴极可沉积的粘合剂,改性的环氧化物 - 胺加合物,并且通过在碱性胺催化剂的存在下使(1)(A )聚环氧化物与(B)化合物,每个分子含有与芳族和/或(环)脂族分子片段键合的一个或多个,优选2个羟基,形成含环氧基团的中间体,和(2) 这些中间体(如果适用)与其它常规改性剂,最后与(C)伯和/或仲(多)胺或其叔胺的盐和/或盐反应,所得反应产物如果合适,可用酸中和,分散在 水性介质,并且这些分散体通过公知的方法进一步加工以形成电泳浴。 根据本发明的电泳浴的特征在于,在由组分(A)和(A)和(B)形成的中间体进一步反应之前,催化组分(A)和(B)之间的反应的碱性胺催化剂被中和, B),其中布朗斯台德酸具有第一阶段解离的pKs值,在20℃下测量,低于3.7,优选低于3.5。