Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Chemische Werke Huels Aktiengesellschaft

Huls Aktiengesellschaft

Degussa Aktiengesellschaft

Dugussa-huels Aktiengesellschaft

Rainer Gras

Elmar Wolf

Josef Disteldorf

Horst Schnurbusch

Johann Obendorf

Siegfried Brandt

Felix Schmitt

Werner Hubel

Heinz Riemer

Klaus Behrendt

Silvia Herda

Joern Volker Weiss

Werner Huebel

Gunter Dormann

Ansgar Schott

Polyaddition products containing hydroxyl and uretdione groups, a process for their preparation, their use for the production of highly reactive polyurethane (PUR) powder coatings which are free from elimination products and which crosslink to give light-stable and weather-stable coating films of high gloss, and the powder coatings produced accordingly are provided.

POLYADDITION PRODUCTS CONTAINING HYDROXYL AND URETDIONE GROUPS, PROCESS FOR THEIR PREPARATION, THEIR USE FOR THE PRODUCTION OF HIGHLY REACTIVE POLYURETHANE POWDER COATINGS WHICH ARE FREE FROM ELIMINATION PRODUCTS, AND THE POLYURETHANE POWDER COATINGS PRODUCED ACCORDINGLY

The invention relates to a process for the preparation of polyaddition products containing uretdione groups, prepared from a polyisocyanate-uretdione having at least two free isocyanate groups, diols and, if desired, monoalcohols or monoamines, in which the polyaddition products containing uretdione groups are prepared by a solvent-free and continuous procedure which is carried out in an intensive kneading apparatus/extruder. The invention also relates to the use of polyaddition products containing uretdione groups for PUR powder coatings and for solvent-containing, one-component stoving enamels.

Process for the preparation of polyaddition products containing uretdione groups, and their use in polyurethane coating systems

Blocked polyisocyanates, a process for their preparation, and their use

Partially or completely blocked polyisocyanates having an built-in HALS stabilizer.

Blocked polyisocyanates with built-in hals stabilizer

Partially or totally blocked polyisocyanates comprising physical mixtures of individual

Partially or completely blocked polyisocyanates having a built-in HALS stabilizer.

Blocked polyisocyanates with built-in HALS stabilizer

A polyisocyanate composition, comprising:

Polyisocyanates containing uretdione groups

Polyurethane powder coating compositions of high reactivity, containing

Process for the preparation of heat curable weather-resistant

Uretdione-functional polyaddition compounds of the formula: ##STR1## where: ##STR2## R.sup.1 is R or linear, branched or cyclic alkylene radicals of 2-16 carbon atoms, R.sup.2 and R.sup.3 are identical or different hydrocarbon radicals of 1-14 carbon atoms, R.sup.4 is R.sup.2 or a group ##STR3##

Uretdione-functional polyaddition compounds, a process for their

The invention relates to cold-curing, low-solvent or solvent-free 2-component polyurethane/polyurea compositions comprising a reaction product of:

Cold-curing, low-solvent or solvent-free 2-component

Urea- and uretdione-functional polyisocyanates having the following formula (I): ##STR1## where ##STR2## n is an integer of from 1 to 20; R.sup.1, R.sup.3 =not more than one linear or branched (cyclo)alkyl radical having 1-14 carbon atoms or H and at least one of the formula: ##STR3## R.sup.2 =R, linear or branched (cyclo)alkyl radical having 6 carbon atoms; R.sup.4, R.sup.5 =identical or different hydrocarbon radicals having 1 to 14 carbon atoms.

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Bochum, Germany

Rainer Gras