Basf Aktiengesellschaft

Juergen Gimpel

Hans-Uwe Schenck

Erich Gulbins

Heinrich Hartmann

Volker Schwendemann

August Lehner

Gregor Ley

Karl-Heinz Feuerherd

Ingolf Buethe

Hans-Uew Schenck

A binder which is suitable for coating agents and is based on a combination which is essentially free of protective colloids and consists of an aqueous primary dispersion of a synthetic polymer and a water-insoluble polycondensate of phenols and aldehydes, some of which may be replaced by ketones, is prepared by a process in which the phenolic components for the polycondensate are first mixed with an aqueous primary dispersion of a synthetic polymer which contains glycidyl, carbonyl, N-methylol, N-alkoxymethyl, ether, amino and/or hydrazo groups and may furthermore contain carboxyl or hydroxyl groups, and the polycondensation with the aldehydes (and ketones) is then carried out in this mixture, under conventional conditions. The binders prepared according to the invention are useful as binders for dispersion paints and coatings, in particular as heat-curable binders for metal finishes.

Preparation of a binder suitable for coating agents

Surface coating binders which contain tertiary amino groups, blocked isocyanate groups, hydroxyl groups and ether groups and are water-soluble or water-dispersible as a result of partial or complete salt formation with an acid are prepared by copolymerization of a mixture comprising

Surface coating binder containing blocked isocyanate groups

Surface-coating binders based on a copolymer which contains tertiary amino groups, blocked isocyanate groups, hydroxyl groups and ether groups and which, due to partial or complete salification with an acid, is water-soluble or water-dispersible. The copolymer contains, as copolymerized units, an olefinically unsaturated compound possessing a tertiary amino group, an N-(alk-1-enyl) isocyanate blocked with a CH-, OH- or NH-acidic blocking agent, and an adduct of an epoxy resin based on bisphenol A and epichlorohydrin, andhaving a molecular weight of from 380 to 3,500, with an olefinically unsaturated alcohol of 3 to 20 carbon atoms, and with an olefinically unsaturated carboxylic acid of 3 to 20 carbon atoms, with or without one or more other copolymerizable olefinically unsaturated compounds, and has a mean molecular weight of from 1,000 to 20,000. The novel surface-coating binder is useful, either as a self-crosslinking binder or as a binder which needs an external crosslinking agent, for the cathodic electrocoating of metallic articles.

Surface-coating binders which contain blocked isocyanate groups and are

A process for coating electrically conductive objects comprising

Process for coating electrically conductive objects with polyurethane

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.

Copolymers containing blocked isocyanate groups, and their use in anodic

Surface-coating binders based on a copolymer which contains tertiary amino groups and blocked isocyanate groups and is water-soluble or water-dispersible as a result of being at least partially salified with an acid. The copolymer contains, as copolymerized units, an olefinically unsaturated compound which possesses a tertiary amino group, an N-(1-alkenyl)-isocyanate which is blocked with a CH-, OH- or NH-acidic blocking agent, and another olefinically unsaturated compound, with or without one or more copolymerizable olefinically unsaturated compounds which possess hydrogen atoms which are reactive toward isocyanate groups, and has a mean molecular weight of from 1,000 to 20,000. The novel surface-coating binders are used for the cathodic electrocoating of metallic articles.

Growing community of inventors

Ludwigshafen, Germany

Juergen Gimpel