Huels Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Jorg Dorffel

Werner Andrejewski

Wilfried Bartz

Werner Otte

Uwe Biethan

Erhard Lange

Friedrich Heinrich

Jurgen Olbrich

Condensation resins obtained by the polycondensation of alkyl aryl ketones and formaldehyde, wherein the polycondensation mixture contains 0.05 to 5% by weight, based on the alkyl aryl ketone, of an activator having the formula (A) ##STR1## wherein X is a nitrogen or phosphorus atom; R.sub.1, R.sub.2 and R.sub.3 are each independently a C.sub.1-3 -alkyl group or a phenyl group; and Y.sup.- is the anion of an inorganic or organic acid, have higher softening points than resins prepared by analogous processes but without the activator.

Alkyl aryl ketone/formaldehyde resin having high softening point

The reaction of maleic anhydride with vinylbenzene to form tetralin dianhydride is improved by conducting, per mole of vinyl group, 2-20 l/h of air (measured under normal conditions: 20.degree. C./l bar) through the reaction mixture.

Process for reacting maleic anhydride with vinylbenzenes

A naphtha-soluble, hydrogenated C.sub.1-4 -alkyl C.sub.6-10 -aryl ketone/formaldehyde resin, having an oxygen content of at least 6% by weight and a softening point of at least 70.degree. C. can be produced by a process comprising the step of hydrogenating a C.sub.1-4 -alkyl C.sub.6-10 -aryl ketone/formaldehyde resin under a hydrogen pressure of at least 200 bar and a temperature of 140.degree.-300.degree. C., in the presence of a nickel, palladium, palladium/copper or palladium/nickel catalyst. These resins are useful, for example, as additives to improve the hardness of varnishes and other coatings.

Naphtha-soluble, hydrogenated alkyl aryl ketone/formaldehyde resins and

In a liquid coating composition comprising a small amount of solvent or no solvent, a binder and optionally conventional auxiliary agents, wherein the binder consists essentially of:

Liquid coating compositions containing little or no solvent

Liquid, highly pigmentable coating compositions containing little or no solvent and which are suitable for spray coating employ a binder consisting either of A. 45-10% by weight of an aminoplast, a low-molecular weight precursor thereof, or a mixture thereof, and B. 55-90% of an at least bifunctional polyester, or a mixture thereof, having predominantly hydroxy end groups, a degree of condensation of between 2.5 and 10.5 and a molecular weight of up to 1,000, and prepared by condensing an alcohol component consisting of 0-30 molar percent of one or more 3-6 carbon atom polyols having 3-4 hydroxy groups and 100-70 molar percent of a mixture of diols consisting of 33-90 molar percent of ethylene glycol and 67-10 molar percent of 1,2-propanediol, or a condensation product of A and B.

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Marl, Germany

Jorg Dorffel