Hoechst Aktiengesellschaft

Josef Mondt

Helmut Rinno

Dieter Engel

Karl J Rauterkus

Thaddaus Wirth

Gerd Walz

Gernot Lohr

Werner Stelzel

Klaus Zimmerschied

Heinz Lehmann

Hans Graff

Hans Vitzthum

Aqueous dispersion for the production of crosslinkable surface coatings, containing, as the binder, a crosslinkable dispersion copolymer formed from olefinically unsaturated monomers and, if appropriate, further customary formulation constituents of lacquers, the dispersed particles of copolymer having average particle diameters from 0.5 to 10 .mu.m and the proportion in the dispersion copolymer of comonomer units carrying crosslinkable groups being greater than 10% by weight, relative to the dispersion copolymer. The preparation of the dispersion by emulsion or suspension copolymerization, in particular with the addition of free radical chain transfer substances, and also the use of the dispersion as a constituent of baking lacquers, hydrofillers, metallic paints and EPC paints. Also a process for the bake-coating of surfaces of solid substrates using the abovementioned aqueous dispersion, wherein the required amount of dispersion is applied to the surface to be coated and is dried at a temperature below its minimum film-forming temperature, and the dried coating is crosslinked by baking at a temperature above the glass transition temperature.

Aqueous dispersions for the preparation of crosslinkable coatings

Process for bake coating the surfaces of solid materials by applying the required amount of an aqueous dispersion to the surface to be coated, the dispersion containing, as the binder, a coarse-grained, crosslinkable dispersion copolymer formed from olefinically unsaturated monomers and, if appropriate, further customary lacquer formulation constituents, and the crosslinkable dispersion copolymer being composed of a mixture of at least 2 components which can contain identical or different monomer units, of which at least one component A, which is coarse-grained, has a relatively low average molecular weight, and at least one component B, which can be coarse-grained or fine-grained, has a relatively high average high molecular weight, and the ratio by weight of the components A:B being preferably within the range from 99:1 to 1:1, drying the applied amount of dispersion at a temperature below its minimum film-formation temperature and cross-linking the dried coating by baking at a temperature above the glass transition temperature of the copolymer.

Process for bake coating the surfaces of solid substances

Crosslinkable fluorine-containing copolymers comprising copolymerized units of

Crosslinkable fluorine-containing copolymers, surface-coatings based on

An aqueous copolymer dispersion can be prepared, with a particular choice of the monomers and the ratios of their amounts, from styrene, esters of acrylic or methacrylic acid, vinyl esters, monomers containing hydroxyl groups, acrylic and/or methacrylic acid, acrylamide or methacrylamide and addition compounds of glycidyl esters of branched monocarboxylic acids with unsaturated carboxylic acids, by polymerization in the presence of an anionic emulsifier and a radical initiator and, if appropriate, a non-ionic emulsifier, which dispersion, in combination with an aminoplast resin, provides thermosetting coatings with excellent properties. These coatings provide highly elastic, weather-resistant, water-resistant surface coatings, which have high adhesion and are free of flaws, on metallic substrates.

Process for the preparation of an aqueous copolymer dispersion

A reactive hardenable binder composition based on

Reactive hardenable binder mixture, process for preparing hardened

Process for preparing copolymers soluble in organic solvents and containing hydroxyl groups, by the polymerization and esterification of (a) at least one .alpha.,.beta.-olefinically unsaturated carboxylic acid with (b) at least one olefinically unsaturated copolymerizable monomer and (c) at least one epoxy group-containing compound, at an elevated temperature, in the presence of a polymerization catalyst and, advantageously, a polymerization modifier, characterized in that glycidol, ##STR1## is used as component (c), either alone or in admixture with one or more glycidyl esters with 12 to 19 carbon atoms and derived from saturated fatty acids, the number of epoxy groups being at least equivalent to the number of carboxyl groups, and in mixtures of glycidol with glycidyl esters, the number of equivalents of glycidyl esters is at most twice as great as the number of equivalents of glycidol. The invention further relates to the use of the products obtained for the preparation of air- or oven-drying coating compositions.

Process for the preparation of copolymers containing hydroxyl groups and

A process is described by which plastics dispersions of high water and saponification resistance are obtained which, due to their small average particle size diameter of 0.01 to 0.06 microns are especially useful as primers for porous substrates. In their penetration characteristics, the present dispersions can be compared with conventional solvent-based primers at comparable solids content. The dispersions are obtained in a one-step polymerization process.

Finely particulate plastics dispersions prepared by metering a mixture

Absorptive substrates, such as asbestos cement, concrete plaster work, can be impregnated to lock the pores and to consolidate the substrate, especially old and weathered plaster work, with aqueous plastics dispersions, if dispersions are used which have an average particle size of about 0.02 to at most 0.1.mu.m, and preferably from 0.036 to 0.080.mu.m. As opposed to conventional dispersions with larger particle sizes, the penetration of dispersions according to the invention reaches the same values as that of the solvent-based impregnating and priming compositions hitherto used. Aqueous dispersions are easier to handle and permit relatively high solids contents at a moderate viscosity.

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Konigstein, Germany

Josef Mondt