Abstract
Urethane clear coatings based on castor oil and MDI, develop extensive yellowing in the sunlight. The photo-oxidation and yellowing in the urethane coatings upon polychromatic irradiation was monitored by FT–IR spectroscopy, UV/visible spectroscopy and Colormate HDS colorimetry. Several quinoidal oxidation products have been evaluated. The photo-oxidation and yellowing have also been evaluated for coatings modified with different additives and/or their synergistic mixtures.
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