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Use of reactable light stabilizers to prevent migration and to improve durability of coatings on plastic substrates

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Abstract

One of the challenges of coating plastic substrates for exterior automotive applications involves the tendency for light stabilizers, which inhibit UV degradation of the coating, to migrate out of the topcoat and into the underlying plastic substrate. The consequent depletion of the stabilizer from the topcoat could account for significantly poorer durability for coatings applied on plastic than on a nonpermeable substrate such as steel.

These studies investigate the migration of both nonreactable and reactable UV absorbers (UVAs) and hindered amine light stabilizers (HALS) in fully formulated 2K urethane coatings applied on thermoplastic olefin (TPO) and steel substrates. Extensive migration of the nonreactable stabilizers occurs during accelerated exposure of the cured coating, and this migration correlates with poorer performance on TPO. Functionalization of the stabilizer with a group which covalently reacts into the coating will prevent much of this migration, and the improved degree of retention of the reactable light stabilizers in the topcoat correlates with improved performance on TPO substrates. In addition, stabilizer variables, such as the type and extent of functionalization as well as their chemical structure, have an effect on both the migration and performance of the stabilizers.

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Authors and Affiliations

  1. Ciba Specialty Chemicals Corporation, 540 White Plains Rd., 10591, Tarrytown, NY

    Nancy Cliff & Mouhcine Kanouni

  2. Scientific Research Laboratory, Ford Research Laboratories, 20000 Rotunda Dr., P.O. Box 2053, MD 3182, 48121, Dearborn, MI

    Cindy Peters

  3. Dupont Performance Coatings, 377 Fairall St., L1S 1R7, Ajax, Ont, Canada

    Phillip V. Yaneff

  4. Dupont Performance Coatings, 3401 Grays Ferry Ave., 19146, Philadelphia, PA

    Karlis Adamsons

Authors
  1. Nancy Cliff
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  2. Mouhcine Kanouni
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  3. Cindy Peters
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  4. Phillip V. Yaneff
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  5. Karlis Adamsons
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Cliff, N., Kanouni, M., Peters, C. et al. Use of reactable light stabilizers to prevent migration and to improve durability of coatings on plastic substrates. J Coat. Technol. Res. 2, 371–387 (2005). https://doi.org/10.1007/s11998-005-0005-y

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  • DOI: https://doi.org/10.1007/s11998-005-0005-y

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