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AssigneeBASF SE
InventorsReinhold Schwalm, Bernd Bruchmann, Frank Vollinger, Erich Beck, Wolfgang Schrof, Uwe Meisenburg
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A curable aqueous polyurethane dispersion substantially comprises a) at least one compound having two free isocyanate groups, at least one allophanate group and at least one C═C double bond capable of free radical polymerization, a carbonyl group or an oxygen atom in the form of an ether function being bonded directly to the double bond, b) at least one compound having at least one group reactive toward isocyanate groups and having a C═C double bond capable of free-radical polymerization, c) if required, at least one compound having at least two groups reactive towards isocyanate groups and selected from hydroxyl, mercapto, primary and/or secondary amino groups, d) at least one compound having at least one group reactive towards isocyanate groups and having at least one acid group, e) at least one basic compound for neutralizing or partially neutralizing the acid groups of the compounds d), and a thermal initiator and is used for coating substrates.
A curable aqueous polyurethane dispersion comprising
A dispersion as claimed in any of the preceding claims, wherein the thermal initiator h) has a half-life at 60° C. of at least one hour.
A dispersion as claimed in any of the preceding claims, wherein the component h) comprises at least one compound which has at least one group reactive toward isocyanate groups and is capable of liberating free radicals thermally even after reaction with a compound containing isocyanate groups.
A dispersion as claimed in any of the preceding claims, wherein the component h) comprises benzopinacol or a derivative thereof.
A dispersion as claimed in any of the preceding claims, wherein the component h) comprises an (arylsulfonyl) acetic acid alkyl ester.
A dispersion as claimed in any of the preceding claims, wherein the isocyanate groups of the compounds of component a) and, if present, g) are reacted to an extent of
Dependencies are inferred from the claim text.