OMG Borchers GmbH | Date: 2017-05-24
The invention relates to an organometallic catalyst that has been encapsulated to create a curing system for water-borne 2K polyurethane coatings. The catalyst is released from the capsules upon film-formation, and without further stimuli, to enable a wide range of application methods. Separation of the catalyst from the coating formulation enables beneficial properties prior to release and activation, such as longer pot-life upon mixing of reactive components, prevention of substantial hydrolysis during storage and use leading to longer shelf life, and the minimization of foam creation.
De Boer J.W.,Catexel BV |
Wesenhagen P.V.,Catexel BV |
Wenker E.C.M.,Catexel BV |
Maaijen K.,Catexel BV |
And 3 more authors.
European Journal of Inorganic Chemistry | Year: 2013
Paint formulations, based either on organic solvents or on water, often contain alkyd resins that depend on catalysts for their oxidative curing. Cobalt carboxylates are the most widely used to date, but the use of these compounds is under pressure because classification as carcinogens under the REACh system is probable, and as a consequence there is great interest in the development of alternative driers to cobalt-based ones. A variety of manganese and iron carboxylates have been studied as paint drying catalysts in the last two decades, but these often show drawbacks with respect to activity, level of application, colour of the paint drier or cost in use. More recently, several reports on active manganese and iron paint driers containing polydentate ligands have been published. In particular, one iron-based catalyst, identified originally for stain bleaching in laundry cleaning, shows good paint drying activity at very low dosage levels, outperforming cobalt carboxylates in a wide range of applications. Paints containing alkyd resins need catalysts for oxidative curing. Because of the probable reclassification of the widely used cobalt carboxylates as carcinogens there is interest in alternative alkyd paint drying catalysts. Various manganese and iron paint driers with polydentate ligands have recently been reported; a particular iron-based catalyst shows good paint drying activity at low dosage. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Deschamps C.,OMG Borchers GmbH |
Bemert L.,OMG Borchers GmbH |
Gibbs H.,OMG Borchers GmbH |
Groteklaes M.,OMG Borchers GmbH
European Coatings Journal | Year: 2013
Functional surfaces with dirt repellent properties are increasingly important as it takes less effort and surfactants to clean them. Existing easy-to-clean effect additives are based on fluorosilanes and polysiloxanes. Their application is limited to special coating systems and their effectiveness often declines with time. In a bachelor thesis the permanent easy-to-clean effect of non-ionic monomeric and polymeric fluorinated surfactants as additives in various coating systems has been investigated. Owing to their hydrophilic and hydrophobic elements, and their amphiphilic structure, they orient themselves at the interface, for example coating/air. The surfactants used in this work are non-ionic, which means that their head-group carries no charge. Both the hydrocarbon and the fluorosurfactants have ethoxylate-groups as their hydrophilic part. Systematic investigation was started from the well-known carbon- based fatty alcohol ethoxylates over the short-chained perfluorinated surfactants to polymeric perfluorinated surfactants.