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Maleimides and tertiary amines — Effective Type II photoinitiators for acrylate polymerisation

Authors
  • Dias, A. A.1
  • Jansen, J. F. G. A.1
  • van Dijck, M.1
  • 1 DSM Research, Geleen, 6160 MD, The Netherlands , Geleen
Type
Published Article
Journal
Surface Coatings International
Publisher
Springer US
Publication Date
Oct 01, 2000
Volume
83
Issue
10
Pages
502–507
Identifiers
DOI: 10.1007/BF02692765
Source
Springer Nature
Keywords
License
Yellow

Abstract

Aliphatic nitrile-terminated, dendrimeric amine synergists are shown to be superior to commercially available tertiary amine synergists such as Ethyl-p-dimethylamino benzoate, and N, N dimethylethanolamine when used with benzophenone or thioxanthone as sensitisers for the photoinitiated polymerisation of acrylate coatings. In addition they have been shown to yield coatings that have less amine-based extractable matter. Maleimides are effective Type II polymerisable photoinitiators when used with an amine synergist and under a nitrogen blanket. A reduction in the photoinitiating efficiency is seen when an aromatic group is attached either to the maleimide or the tertiary amine. The photoinitiating combination of a nitrile dendrimer with cyclohexyl maleimide under a nitrogen blanket was found to be more effective in air than the benzophenone/tertiary amine. These results indicate that maleimides have potential as useful photoinitiators for the radiation curing of a aylate-based formulations. Dendrimers are monodisperse three dimensional branched macromolecules with a highly symmetrical structure.

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