Synthesis and characterization of urethane vinyl ether crystalline monomers

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Abstract:

UV powder coatings combine the advantages of both conventional thermoset powder coatings and liquid UV‐curing coatings. In this paper, a series of crystalline monomers based on urethane vinyl ether have been synthesized by reaction of hexamethylene diisocyanate (HDI) with hydroxybutyl vinyl ether (HBVE) or together with a saturated alcohol such as 1‐octanol, 2‐butoxy ethanol and 2‐ethoxy ethanol. The crystallinity of the monomers was characterized by DSC, WAXD and polarizing microscopy. It was found that the melting point of the monomer can be expediently adjusted to an adequately low level by changing the type and/or the amount of the saturated alcohol added during the synthesis procedure. Thus, when 20–40 mol% of HBVE was replaced by a saturated alcohol, the melting point decreased to around 75–90 °C, which is suitable for UV‐curing powder coating formulations. Copyright © 2006 Society of Chemical Industry

Keywords: UV powder coating; crystalline monomer; urethane; vinyl ether

Document Type: Research Article

DOI: http://dx.doi.org/10.1002/pi.1971

Publication date: March 1, 2006

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