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The behavior of MEKO-blocked isocyanate compounds in aluminum flake pigmented, polyester–polyurethane can coating systems

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Abstract

Information is given concerning the curing characteristics of polyester–polyurethane (PEPU)-based food can coatings and the analysis of the free isocyanate by-products. The behavior of a methyl ethyl ketoxime (MEKO)-blocked isocyanate on heating was studied using thermal analytical techniques. Following this, the curing behavior of a PEPU-based can coating (PEPU01 that contained an aluminum flake pigment) and the MEKO-blocked isocyanate was investigated. A study of the unblocking of the MEKO-blocked isocyanate in the PEPU01 can coatings was undertaken with respect to the migration potential of any residual-free isocyanate compounds that could migrate from the cured PEPU can coatings to the surrounding medium (e.g., foodstuffs).

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Acknowledgment

This study was carried out as a part of a DEFRA LINK project FQS45 New technologies and chemistries for food can coatings. Funding by Defra and matching funds in kind from Valspar Corporation, Impress Group and H. J. Heinz are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Colour Science, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire, LS2 9JT, UK

    C. Jiang & J. T. Guthrie

  2. Department for Environment Food and Rural Affairs, Central Science Laboratory, Sand Hutton, York, YO41 1LZ, UK

    M. Driffield, E. L. Bradley & L. Castle

  3. Valspar UK Ltd., Station Lane, Witney, Oxfordshire, OX28 4XR, UK

    P. K. T. Oldring

Authors
  1. C. Jiang
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  2. M. Driffield
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  3. E. L. Bradley
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  4. L. Castle
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  5. P. K. T. Oldring
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  6. J. T. Guthrie
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Correspondence to J. T. Guthrie.

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Jiang, C., Driffield, M., Bradley, E.L. et al. The behavior of MEKO-blocked isocyanate compounds in aluminum flake pigmented, polyester–polyurethane can coating systems. J Coat Technol Res 7, 57–65 (2010). https://doi.org/10.1007/s11998-009-9174-4

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  • DOI: https://doi.org/10.1007/s11998-009-9174-4

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