Ambient temperature curable hydrophilic PU oligomer, method...

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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C522S097000, C522S090000, C522S174000, C522S074000, C522S071000, C522S077000, C528S044000, C528S071000, C528S075000, C528S076000, C524S507000, C524S591000, C524S839000, C524S840000, C525S123000, C525S127000, C525S452000, C525S455000, C525S457000, C525S458000, C525S460000, C427S388400, C427S508000, C428S423100

Reexamination Certificate

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08053488

ABSTRACT:
An ambient temperature curable hydrophilic PU oligomer includes a PU pre-polymer having a hydrophilic center group and a curable terminated group. The ambient temperature curable hydrophilic PU oligomer includes the moisture-curable hydrophilic PU oligomer such as isocyanate-terminated PU pre-polymer and free-radical curable hydrophlic PU oligomer. The isocyanate-terminated PU pre-polymer is synthesized by mixing at least one multi-isocyanate, at least one polyol and one or more diol monomer with hydrophilic group. The acrylate-terminated PU oligomer is synthesized by adding 2-hydroxyethyl methacrylate (HEMA) into the isocyanate-terminated hydrophilic PU pre-polymer. Either acrylate- or isocyanate-terminated PU oligomer can be applied on a textile or a glass surface with a thin-layer coating technology. The curing reactions of these hydrophilic thin-layer coatings are carried out with moisture or UV-radiation, respectively, at ambient temperature. These moisture-cured or UV-radiation cured hydrophilic PU coating has water-resistant properties and the hydrophilic characters remain unchanged.

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