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    • 5. 发明授权
    • Synthesis of modified epoxy resins for cathodic electrodeposition with
catalyst deactivation and diol modification
    • 用催化剂失活和二醇改性合成阴极电沉积改性环氧树脂
    • US5753726A
    • 1998-05-19
    • US767237
    • 1996-12-13
    • Hardy ReuterWalter JouckGunther Ott
    • Hardy ReuterWalter JouckGunther Ott
    • C08G59/14C08G59/00C08G59/06C09D5/44C09D163/00C25D13/06C08K3/20C08L63/00
    • C08G59/00C08G59/066C09D5/4434
    • Epoxy resins for preparing water-dispersible binders for cathodic electrodeposition coating materials, the epoxy resin being preparable by reacting a) polyepoxides having at least one glycidyl group per molecule b) and, optionally, up to 60% by weight, based on the overall epoxy resin reaction product, of aliphatic and/or alicyclic hydroxy compounds having preferably two or on average less than two hydroxyl groups per molecule and a molecular weight of less than 9000 g/mol, c) in the presence of a catalyst consisting of neutral metal salts, such as alkali metal salts and alkaline earth metal salts, zinc salts and nickel salts of tetrafluoroboric, tetrachloroboric, hexafluoro- antimonic,hexachloroantimonic,hexafluorophosphoric, perchlorate and periodic acid, and d) adding a deactivating agent which prevents the epoxy groups reacting further or effectively reduces the rate of such reaction as soon as the phenolic hydroxyl groups have already substantially reacted and at least 0.6% by weight of epoxy groups are still present, based on the overall weight of the epoxy resin reaction product.
    • 用于制备用于阴极电沉积涂料的水分散性粘合剂的环氧树脂,所述环氧树脂可通过以下方式制备:a)基于总体环氧树脂,a)每分子具有至少一个缩水甘油基的聚环氧化物b)和任选的至多60重量% 树脂反应产物,脂族和/或脂环族羟基化合物,每分子优选具有两个或每个平均少于两个羟基,分子量小于9000g / mol; c)在由中性金属盐组成的催化剂存在下, 如碱金属盐和碱土金属盐,四氟硼酸,四氯硼酸,六氟锑,六氯锑,六氟磷酸,高氯酸盐和高碘酸的锌盐和镍盐,和d)加入防止环氧基进一步反应的失活剂 一旦酚羟基已经基本上反应并且至少0.6%,则有效地降低了这种反应的速率 基于环氧树脂反应产物的总重量,仍然存在一些环氧基团。