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Which is better in yellowing resistance, urethanated alkyd based on aromatic isocyanates or that based on aliphatic isocyanates?

April 26, 2017aliphatic alkyd AROMATIC based isocyanates resistance yellowing

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Which is better in yellowing resistance, urethanated alkyd based on aromatic isocyanates or that based on aliphatic isocyanates?

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Aliphatic isocyanates react more slowly and considerably more expensive than the aromatic isocyanates, but they allow the formulation of nonyellowing, light stable, Aliphatic polyurethane to minimize yellowing and darkening.