Blocked polyisocyanates curing free from elimination products for dualcure systems
First Claim
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1. A polyisocyanate which:
- A) comprises at least one thermally reversibly blocked NCO group whose blocking agent is selected from the group consisting of (meth)acryloyloxyethyl acetoacetate, (meth)acryloyloxypropyl acetoacetate, (meth)acryloyloxybutyl acetoacetate and combinations thereof,B) has exclusively aliphatically and/or cycloaliphatically attached isocyanate groups, andC) is prepared from an organic polyisocyanate having an NCO functionality >
2.
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Abstract
The invention provides innovative blocked polyisocyanates whose crosslinking is initiated thermally and photochemically. The polyisocyanates comprise at least one thermally reversibly blocked NCO group whose blocking agent contains at least one group which on exposure to actinic radiation reacts, with polymerization, with ethylenically unsaturated compounds. A process for preparing the polyisocyanates, and their use in binders, is also provided.
14 Citations
18 Claims
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1. A polyisocyanate which:
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A) comprises at least one thermally reversibly blocked NCO group whose blocking agent is selected from the group consisting of (meth)acryloyloxyethyl acetoacetate, (meth)acryloyloxypropyl acetoacetate, (meth)acryloyloxybutyl acetoacetate and combinations thereof, B) has exclusively aliphatically and/or cycloaliphatically attached isocyanate groups, and C) is prepared from an organic polyisocyanate having an NCO functionality >
2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A polyisocyanate which:
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A) comprises at least one thermally reversibly blocked NCO group whose blocking agent is selected from the group consisting of (meth)acryloyloxyethyl acetoacetate, (meth)acryloyloxypropyl acetoacetate, (meth)acryloyloxybutyl acetoacetate and combinations thereof and B) has exclusively aliphatically and/or cycloaliphatically attached isocyanate groups, C) comprises a uretdione, carbodiimide, isocyanurate, iminooxadiazinedione, biuret, urethane, allophanate, oxadiazinetrione or acylurea structure, and D) is prepared from an organic polyisocyanate having an NCO functionality of >
2. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A coating material comprising:
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B1) one or more polyisocyanates comprises a reaction product of; A1) one or more organic polyisocyantes having exclusively aliphatically and/or cycloaliphatically attached isocyanate groups, wherein the organic polyisocyanates have an NCO functionality of >
2;A2) optionally one or more compounds, different from A4), which comprise at least one isocyanate-reactive group and contain at least one group which on exposure to actinic radiation reacts, with polymerization, with ethylenically unsaturated compounds, A3) optionally further isocyanate-reactive compounds other than the compounds of component A2) and A4), and A4) a blocking agent selected from the group consisting of (meth)acryloyloxyethyl acetoacetate, (meth)acryloyloxypropyl acetoacetate, (meth)acryloyloxybutyl acetoacetate and combinations thereof, A5) optionally in the presence of one or more catalysts and/or solvents, reactive diluents and/or auxiliaries and additives, B2) one or more compounds comprising at least one isocyanate-reactive group and containing optionally one or more functional groups which on exposure to actinic radiation react, with polymerization, with ethylenically unsaturated compounds, B3) one or more compounds which carry functional groups which on exposure to actinic radiation react, with polymerization, with ethylenically unsaturated compounds and which contain neither NCO groups nor NCO-reactive groups, B4) optionally catalysts and B5) optionally auxiliaries and additives. - View Dependent Claims (17, 18)
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Specification