Photoactivatable water borne coating composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

Reexamination Certificate

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C522S096000, C522S174000, C524S507000, C524S591000, C524S839000, C524S840000, C525S123000, C525S127000, C525S452000, C525S455000, C525S457000, C525S458000, C525S460000, C528S071000, C528S075000, C528S076000, C427S388400

Reexamination Certificate

active

06987135

ABSTRACT:
Photoactivatable water born coating composition comprisinga) a (meth)acryloyl-functional polyurethane dispersion, with the (meth)acryloyl-functional polyurethane comprising 5 to 18 wt. % of alkylene oxide groups while the (meth)acryloyl functionality is in the range of 2 to 40, andb) a UV-initiator.Preferably, the (meth)acryloyl-functional polyurethane comprises 8 to 18 wt. % of alkylene oxide groups. More preferably, the coating composition comprises a reactive diluent.The (meth)acryloyl-functional polyurethane is obtainable by reaction of:a) at least one organic polyisocyanate,b) optionally, at least one organic compound containing at least two isocyanate-reactive groups and having a number average molecular weight in the range of 400 to 6,000,c) at least one isocyanate-reactive and/or isocyanate-functional compound bearing non-ionic dispersing groups,d) at least one isocyanate-reactive (meth)acryloyl-functional compound,e) optionally, at least one active hydrogen-containing chain extender, andf) optionally, at least one active hydrogen-containing compound bearing ionic groups.The water born coating composition is especially suitable for application as a clear coat.

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Journal of Applied Polymer Science vol. 62, 1996, pp. 1775-1782, Song et al. Preparation of UV-Curable Emulsions Using PEG-Modified Urethane Acrylates: The Effect of Nonionic Groups.

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