Mixture which can be thermally hardened and hardened by actinic radiation and use thereof
AssigneeBASF Coatings GmbH
InventorsGuido Wilke, Ulrike Röckrath, Karl-Heinz Joost, Egon Wegner, Hubert Baumgart, Uwe Meisenburg
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Abstract
A mixture and method for preparing a composition curable thermally and with actinic radiation comprising a binder free from carbon-carbon double bonds activatable with actinic radiation, at least one blocked or unblocked polyisocyanate having at least one soft, flexibilizing segment, and at least one unsaturated polyfunctional urethane that is free from isocyanate-reactive functional groups and contains on average per molecule more than four carbon-carbon double bonds activatable with actinic radiation and at least one hardening segment.
Claims21
A mixture curable thermally and with actinic radiation comprising
- (A) a binder free from carbon-carbon double bonds activatable with actinic radiation comprising at least one (meth)acrylate copolymer containing on average per molecule at least one isocyanate-reactive functional group and having a glass transition temperature Tg of from −40 to +80° C.,
- (B) at least one polyisocyanate that is at least one of blocked and unblocked having at least one soft, flexibilizing segment, which as a constituent of three-dimensional polymeric networks lowers their glass transition temperature Tg, and
- (C) at least one unsaturated polyfunctional urethane that is free from isocyanate-reactive functional groups and contains on average per molecule more than four carbon-carbon double bonds activatable with actinic radiation and at least one hardening segment, the hardening segment as a constituent of three-dimensional polymer networks increasing their glass transition temperature Tg.
Dependencies are inferred from the claim text.