Abstract: A radiation-curable powder coating compositions based on crystalline urethane acrylates, which crosslink to light-stable and weather-stable coating films.

Abstract: Polyurethane compositions which contain less than 5% by weight of free NCO groups and from 1 to 18% by weight of uretdione groups, can be cured at low temperature and can be used as coating compositions.

Abstract: Polyurethane powder coating compositions containing uretdione groups and curing at low temperatures are provided, along with processes for preparing such compositions, and their use as powder coatings, wherein the compositions generally contain: A) a uretdione-containing powder coating hardener derived from aliphatic, (cyclo)aliphatic, cycloaliphatic or aromatic polyisocyanates and hydroxyl-containing compounds, and having a melting point from 40 to 130° C., a free NCO content of less than 5% by weight, and a uretdione content of 6-18% by weight; B) a hydroxyl-containing polymer having a melting point from 40 to 130° C., and an OH number between 20 and 200 mg KOH/gram, and C) a catalyst of the formula [NR1R2R3R4]+[R5]?, in which R1-R4 simultaneously, or independently of one another, are alkyl, aryl, aralkyl, heteroaryl or alkoxyalkyl radicals, and each R1-R4 is aromatic, linear or branched, unbridged or bridged with other radicals, R1-R4.

Abstract: The invention relates to polyurethane powder coatings which comprise solid polyaddition compounds containing uretdione groups and to a process for their preparation. The polyurethane powder coatings cure at low temperatures and form paint films which are high gloss or matt and light- and weather-stable.

Abstract: Polyurethane powder coating compositions based on epoxy-terminated polyaddition compounds having uretdione groups, which cure at low baking temperatures, a process for preparing such compositions, and their use for producing plastics, especially polyurethane powder coatings, which crosslink at low baking temperatures to give high-gloss or matt, light-stable and weather-stable coating films.

Abstract: Epoxy-functional powder coating compositions which cure at low baking temperatures, a process for preparing such compositions, and their use for producing plastics, especially powder coatings, which crosslink at low baking temperatures to give high-gloss or matt, light-stable and weather-stable coating films.

Abstract: Solid polyaddition compounds containing uretdione groups for polyurethane powder coating compositions which can be cured at a low temperature.

Abstract: A process for preparing ketone-formaldehyde resins, especially acetophenone- and cyclohexanone-formaldehyde resins, having a low water content and high thermal stability and yellowing resistance, and a process for their production and their use.

Abstract: Light-stable and weather-stable coating films contain a powder coating composition, containing from 30 to 98.5% by mass of a binder containing at least one urethane (meth)acrylate having a melting point of from 40 to 130° C.; from 1 to 20% by mass of at least one micronized wax; and from 0.5 to 50% by mass of at least one auxiliary and/or at least one additive, the composition being cross-linked by actinic radiation.

Abstract: A radiation curable powder coating composition that contains a) a binder having at least one amorphous urethane acrylate having a glass transition temperature of at least 35° C. and a melting point of from 50 to 120° C.; and b) an auxiliary, can be crosslinked by radiation to produce a lightfast and weather-stable film.

Abstract: A heat-curable powder coating composition is provided that can form crosslinked films exhibiting enhanced hydrophobicity. The coating composition comprises a compound having functionalized polyhedral oligomeric silicon-oxygen cluster units.

Abstract: The present invention relates to new cross-linking agents and thermosetting paints, which lead to improved properties such as scratch resistance of cured thermosetting paints or exhibit good solubility.

Abstract: A polyaddition compound having uretdione and carboxyl groups, and having a melting range of between 40 and 200° C., a free NCO group content of from 0 to 5% by weight and an NCO functionality of at least 1.5, and a number-average molar mass of between 1000 and 10,000, may be prepared by reacting at least one polyisocyanate containing uretdione groups, at least one hydroxycarboxylic or mercaptocarboxylic acid, and one or more of at least one monofunctional compound having a functional group which is reactive toward an isocyanate, at least one aliphatic and/or cycloaliphatic polyol, at least one polyol having functional groups, and at least one aliphatic and/or cycloaliphatic polyamine. Polyurethane plastics, especially polyurethane powder coating materials may be prepared from the polyaddition compound of the present invention.

Abstract: A radiation-curable powder coating composition, contains: I. a binder containing at least one compound crosslinkable by actinic radiation; and II. at least one compound containing polyhedral oligomeric silicon-oxygen cluster units, represented by the formula [(RaXbSiO1.5)m(RcXdSiO)n(ReXfSi2O2.

Abstract: A highly reactive polyurethane powder coating composition, which contains uretdione groups that are hardenable at low temperatures, contains A) at least one uretdione-containing powder coating hardener based on aliphatic, (cyclo)aliphatic or cycloaliphatic polyisocyanates and hydroxyl-containing compounds, the hardener having a melting point of from 40 to 130° C., a free NCO content of less than 5% by weight, and a uretdione content of 6-18% by weight; B) at least one hydroxyl-containing polymer having a melting point of from 40 to 130° C., and an OH number of between 20 and 200 mg KOH/g; C) 0.001-3% by weight of at least one tetraalkyl ammonium carboxylate catalyst, based on a total amount of components A) and B). Components A) and B) are present in a ratio so that for each hydroxyl group of component B) there is from 0.3 to 1 uretdione group of component A).

Abstract: The use of pulverulent thermosetting coating compositions based on physical mixtures of individual isocyanato isocyanurates formed from aliphatic and (cyclo)aliphatic and/or cycloaliphatic diisocyanates and from polyesters containing hydroxyl groups and terephthalic acid for coil powder coating materials, to a process for producing such coatings, and to the metal coils coated with such coating materials.

Abstract: A radiation curable powder coating composition, comprising I.) a binder comprising A) 60-90% by weight of at least one amorphous urethane acrylate; and B) 10-40% by weight of at least one crystalline urethane acrylate; wherein a Tg of a mixture of A) and B) is at least 35° C.; and II.) an auxiliary and an additive, excluding an UV initiator, crosslinks to yield a lightfast and weather-stable film.

Abstract: Solid polyurethane powder compositions which contain uretdione groups and cure at low baking temperatures, to processes for preparing such compositions, and to their use for producing plastics, especially powder coatings, which crosslink to high-gloss or matt, light- and weather-stable coating films.

Abstract: A UV curable powder coating composition having a binder containing A) 60-90% by weight of at least one amorphous urethane acrylate and B) 10-40% by weight of at least one crystalline urethane acrylate; and having an auxiliary, crosslinks to form a light- and weather-stable paint film that possesses excellent gloss.

Abstract: A polyaddition compound containing an uretdione group is obtained by solvent-free preparation in an intensive mixer, especially in a single-screw or multiscrew extruder.