PAINT BONDING AGENT BASED ON COPOLYMER CONTAINING MASKED ISOCYANATE GROUP AND USE OF SAID COPOLYMER FOR ANODE ELECTRODEPOSITION PAINTING

    公开(公告)号:JPS573866A

    公开(公告)日:1982-01-09

    申请号:JP6709181

    申请日:1981-05-06

    Applicant: BASF AG

    Abstract: Surface-coating binders based on a copolymer which contains carboxyl groups, blocked isocyanate groups, hydroxyl groups and ether groups, and which, due to partial or complete salification with ammonia or with an organic base, is water-soluble or water-dispersible. This copolymer contains, as copolymerized units, one or more alpha , beta -olefinically unsaturated carboxylic acids of 3 to 5 carbon atoms or one or more half-esters of an alpha , beta -olefinically unsaturated dicarboxylic acid of 3 to 5 carbon atoms, an N-(1-alkenyl) isocyanate blocked with a CH-, OH- or NH-acidic blocking agent, an adduct of an epoxy resin, based on bisphenol A and epichlorohydrin and having a molecular weight of from 380 to 3,500, with an olefinically unsaturated alcohol of 3 to 20 carbon atoms, and one or more other copolymerizable olefinically unsaturated compounds, and has a mean molecular weight of from 1,000 to 20,000 and an acid number of from 35 to 150 mg of KOH/g. The novel surface-coating binder is useful for the anodic electrocoating of metallic articles.

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