Deutsche Texaco Aktiengesellschaft

Gundolf Fuchs

Dietrich Pirck

Heiko Humbert

Karl Erhard

Friedrich Engelhardt

Disclosed is a polyacrylic acid-esters based adhesive copolymer prepared from 85-65 percent by weight of 2-ethylhexylacrylate; O-20-n-butylacrylate; 8-12 acrylonitrile 2-6 acrylic acid; 0.5 to 2 acrylamide and/or 0.5 to 2 hydroxyalkylmethacrylate and from 1 to 2 percent by weight basis copolymer of an external cross linking agent having at least two ClCH.sub.2 CO groups. The adhesive is prepared in the form of aqueous dispersion, having a solids content of about 40 to 60 percent by weight and a viscosity range of about 800 to 1000 cPs.

Cold-cross linking dispersion adhesives

Cold cross linking polyacrylic acid esters-based dispersion adhesives having a viscosity in the range of 800 to 1000 cps and a solids content of about 40 to 60 weight percent containing a copolymer prepared from 65 to 85 weight percent of 2-ethylhexyl acrylate; 0 to 20 weight percent of n-butylacrylate; 8 to 12 weight percent of acrylonitrile; 2 to 6 weight percent of acrylic acid; 0.5 to 2 weight percent of hydroxylakylmethacrylate; 1.0 to 5 weight percent, basis copolymer, of an internal or external acetoacetic ester cross-linking agent derived from the esterification with C.sub.2 to C.sub.6 diols or 1,1,1-tris(acetoxymethyl) alkanes wherein the alkane group contains from 3 to 7 carbon atoms and optionally, calophonium and other fillers or adhesive additives.

Cold cross-linking dispersion adhesive

Cold cross-linked polyacrylic acid esters-based dispersion adhesives containing:

Synthetic resins suitable for use in the preparation of baking varnishes are prepared by copolymerizing a vinyl aromatic hydrocarbon, an ester of an alpha, beta-unsaturated monocarboxylic such as an acrylate and an alpha, beta-unsaturated, dicarboxylic acid, such as maleic acid, in solution or dispersion, the carboxyl groups of which being esterified with alcohols, etc. to yield a half-ester copolymer and reacted with alkylene oxides to a low residual acid number after which the solution or dispersion is adjusted with regard to acid number through the addition of phosphoric acid.

Process for the production of resins containing hydroxyl groups

Cold-set lacquers are prepared by emulsifying acrylate monomers with 1 to 10 percent by weight of a cold cross-linkable comonomer in water, polymerizing, and adding to the resultant polymer dispersion, a dispersion of 3 to 15 percent by weight, based on the solids content of the polymer dispersion, of a water-soluble polyamino-amide and, optionally, usual additives. The lacquers give coatings which have good gloss and hardness and are at the same time water-resistant.

Process for preparing a cold-set lacquer

Novel powder coating compositions consisting of resinous polyhydroxyl compounds as film-forming agents, a cross-linking agent, an activator, and conventional additives are described. In contrast to the known powder coating compositions, the activator rather than cross-linking agent is blocked. The novel cross-linking agents employed are bisazlactones. Activators for use in cross-linking reactions are strong acids which are blocked, i.e they are employed in the form of their thermolabile esters or amine salts. The powder coating compositions of this invention are storable and they can be baked at predetermined temperatures to provide high gloss and elastic coatings.

Powder coating compositions

A process for purifying a primary monoalcohol being admixed with diol impurities containing primary and secondary hydroxyl groups without appreciably affecting the primary hydroxyl groups of said admixture, which comprises passing a mixture of said diol and said monoalcohol at a temperature of about 170.degree. to 220.degree.C in the liquid phase over a gamma-alumina catalyst.

Method of purifying monoalcohols

This invention describes a process for the production of a single-component resin powder useful in electrostatic spray coating processes by the formation of partially esterified and alkoxylated copolymers obtained through the reaction of vinyl-aromatic hydrocarbons with alpha, beta-unsaturated dicarboxylic acid anhydrides which are subsequently half-esterified and thereafter the resultant carboxyl group of which is alkoxylated with C.sub.2 to C.sub.4 alkene oxides. Said copolymer is reacted with a monoblocked diisocyanate between 110.degree. and 130.degree.C in the melt form until said single-component resin powder is formed.

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Hemmingstedt, Germany

Gundolf Fuchs