2021-Nov-05
Chiguard® R-455 (R-455) is a novel benzotriazole UV absorber (UVA) that contains a propane diol group. It can react with various hardeners such as isocyanates, melamine resins, and siloxanes. When used with polyurethane elastomers, R-455 reacts with isocyanates to form covalent bonds and becomes part of the polymer main chain. This property completely solves the UVA migration issue that has plagued polyurethane manufacturers for many years.
When used with polyurethane elastomers, R-455 reacts with isocyanates to form covalent bonds and becomes part of the polymer main chain. This completely solves the UVA migration issue that has plagued polyurethane manufacturers for many years. In Figure 1, 2% R-455 MDI-based TPU achieves a yellowing resistance level that is as good as aliphatic TPU after 168 hr QUV340 exposure.
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