Preparation and characterisation of pigmented UV curable coating based on cresol novalac epoxy acrylate resins

Abstract

UV curable systems have found wide applications in clear coatings. However, coatings containing pigment showed a degree of curing inhibition due to the absorption, scattering and reflection of the UV radiation caused by the presence of pigments in the coating film. This results in poor through‐cure and consequently in poor adhesion. Thus, pigments used in the UV curable coating systems should not absorb radiation in the same region as the photo‐initiators. One of the solutions to such a problem, reported in this paper, was to develop more reactive, alcohol soluble, non‐heat reactive, low molecular weight cresol based, pigmented novolac epoxy acrylate systems, which have a lower absorption in the UV region. In addition, the effects of several photoinitiators having absorption in the longer wavelength region of the UV spectrum were investigated.

Citation

Bajpai, M. and Shukla, V. (2003), "Preparation and characterisation of pigmented UV curable coating based on cresol novalac epoxy acrylate resins", Pigment & Resin Technology, Vol. 32 No. 6, pp. 382-389. https://doi.org/10.1108/03699420310507830