Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung eines Pulverlacks. Um Beschädigungen der Produktionsanlagen bei der Herstellung eines Pulverlacks mit pulverförmigem Zusatzstoff zu vermeiden, umfasst das Verfahren die folgenden Schritte: - Bereitstellen einer pulverförmigen Basiszusammensetzung, umfassend Bindemittel, sowie - Vermischen wenigstens eines pulverförmigen Zuschlagstoffs mit der pulverförmigen Basiszusammensetzung zu einem fertigen Pulverlack, wobei beim Vermischen ein pulverförmiger Zustand von Zuschlagstoff und Basiszusammensetzung erhalten bleibt, und wobei schmelzbeständiges Schmiermittel und / oder Hartstoff als Zuschlagstoff eingesetzt wird.
Abstract:
The invention relates to a powder coating composition comprising a physical mixture of a powder (A) and a powder (B),wherein the powder (A) comprises a thermal radical initiator selected from the group of peroxyesters, monoperoxycarbonates and mixtures thereof, wherein the powder (B) comprises a catalyst for the thermal radical initiator, selected from the group of salts or complexes of Mn, Fe, Cu and mixtures thereof, wherein powder (A) does not comprise a catalyst for the thermal radical initiator and wherein powder (B) does not comprise a thermal radical initiator, wherein a resin containing reactive unsaturations is present in powder (A) and/or powder (B), wherein in case the reactive unsaturations in the resin are not able to react with each other after thermal radical initiation, a co-crosslinker selected from the group of vinylethers, methacrylates, acrylates, vinylamides, itaconates, vinylesters, enamines, thiols and mixtures thereof, is present in powder (A) and/or in powder (B).
Abstract:
The invention relates to a one component heat curable powder coating composition comprising a resin containing reactive unsaturations and wherein all said reactive unsaturations are carbon carbon double bonds connected directly to an electron withdrawing group, a thermal initiation system comprising a peroxide chosen from the group of compounds represented by formula (1), wherein R 1 and R 2 each independently stand for an optionally substituted alkyl of 1 to 30 C-atoms, wherein the 1 to 30 C-atoms do not include the C-atoms of the substituents or for an optionally substituted aryl of 6 to 18 C-atoms, wherein the 6 to 18 C-atoms do not include the C-atoms of the substituents, and a co-crosslinker chosen from the group of vinylethers, vinyletherurethanes, vinylesters, vinylamides, itaconates, enamines, vinylureas and mixtures thereof.
Abstract:
The invention relates to a one component heat-curable powder coating composition comprising a resin containing reactive unsaturations and wherein all said reactive unsaturations are carbon carbon double bonds connected directly to an electron withdrawing group, a thermal initiation system comprising a transition metal catalyst and a peroxide, wherein the peroxide is chosen from the group of peroxyesters, mono-peroxycarbonates and mixtures thereof and a co-crosslinker chosen from the group of vinylethers, vinylesters, vinylamides, itaconates, enamines and mixtures thereof.
Abstract:
The present invention relates to a pulverulent composition for the manufacture of articles having a metallic appearance that is stable over time and an improved resistance to pencilling, said composition comprising: from 50 to 99.9% by weight of at least one thermoplastic polymer, from 0.1 to 5% by weight of at least one effect pigment, from 0 to 0.3% by weight of at least one metallic pigment relative to the total weight of the composition.
Abstract:
A process for the manufacture of a powder coating comprising the steps of: Preparing a powder coating premix comprising a resin and optionally a crosslinker therefor; Feeding the premix through a melt extruder; Cooling the extruded material; and Comminuting it to fine particles, wherein said process is characterized in that between 1 and 25 wt. % (based on the weight of said premix) of a process liquid is added to the melt extruder, wherein said process liquid is immiscible with at least said resin of the powder coating premix and wherein said process liquid evaporates when the premix leaves the extruder.
Abstract:
The present invention relates to a matting agent for powdered coatings, comprising at least one at least simple reaction product, obtainable by the reaction a) of at least one aromatic polycarboxylic acid having at least three acid functionalities or the derivatives thereof, wherein the derivatives are selected from the group consisting of carboxylic acid anhydrides, carboxylic acid halogenides, carboxylic acid esters, active esters (particularly reactive esters, for example obtained by the activation of a carboxylic acid by esterification) and/or mixtures thereof with b) at least one nucleophile, comprising at least one nucleophilic oxygen, nitrogen, sulfur or phosphorus functionality and/or at least two nucleophilic oxygen, nitrogen, sulfur or phosphorus functionalities, which can be the same or different.
Abstract:
A liquid semi-crystalline polyester bearing carboxyl groups is grafted to a carboxyl functional amorphous polyester resin to produce a binder suitable to provide powder coatings with excellent surface appearance, very good flow and improved resistance to outdoor exposure.
Abstract:
A process of preparation of an antimicrobial powder coating composition comprising the steps: a) transforming a natural antimicrobial agent in a salt-form and micronizing the resulting antimicrobial salt into powder, b) mixing at least one of the natural antimicrobial salt together with at least one amino-reactive thermoplastic binder resin, c) subjecting the mixture to a melt compounding process at a temperature in a range of 80 to 230°C, at a residence time period in a range of 5 to 60 seconds, using at least one co-rotating twin-screw extruder with a soft screw design having conveying elements offering a high D/d ratio and having mixing forward kneading block elements, d) cooling the extrudate, and e) micronizing into powder particles. The process forms a powder coating composition containing a natural antimicrobial agent which results in high quality antimicrobial coatings showing a homogeneous distribution of the antimicrobial agent in the coating and a stable antimicrobial activity.
Abstract:
Die vorliegende Erfindung betrifft ein Mattierungsmittel für Pulverlacke, enthaltend mindestens ein mindestens einfaches Umsetzungsprodukt, herstellbar durch Reaktion a) mindestens einer aromatischen Polycarbonsäu- re, die mindestens drei Säurefunktionalitäten aufweist, oder deren Derivate, wobei die Derivate ausgewählt sind aus der Gruppe bestehend aus Carbonsäureanhydriden, Carbonsäure halogeniden, Carbonsäureestern, Aktivestern (besonders reaktive Ester, z.B. erhalten durch Aktivierung einer Carbonsäure durch Veresterung) und/oder Mischungen hieraus mit b) mindestens einem Nucleophil, das mindestens eine nucleophile Sauerstoff-, Stickstoff-, Schwefel- oder Phosphorfunktionalität und/oder mindestens zwei nucleophile Sauerstoff-, Stickstoff-, Schwefel- oder Phosphorfunktionalitäten, die gleich oder verschieden sein können, aufweist.