Vinyl-Functional UV-Curable Polyurethanes


 Number/Link: WO2016038112 (German)

Applicant/Assignee: Henkel

Publication date: 17-03-2016

Gist”: Alkenylether-functional polyols are used in oligomeric PU adhesives.

Why it is interesting: Alkenylether-functional groups are highly reactive and can be cured by UV-initiated cationic polymerization. This has the advantage of being unsensitive to oxigen which allows for so-called “dark cure”, i.e. the continuing polymerization after a first pulse of UV light. According to this invention, vinyl functional polyols are prepared by polymerizing a hydroxyl- or amine functional vinyl ether, e.g. 4-hydroxybutylvinylether (HBVE) or 3-aminopropylvinylether with epoxides or cyclocarbonates. The polyols can then be reacted with isocyanates resulting in UV curable polyurethanes.  In an example HBVE is reacted with 1,4-butanedioldiglycidylether to make the vinyl-functional polyol which is then further reacted with isophorondiisocyanate to make the PU adhesive.



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