Resistance to Ultraviolet Light
Polyethers and polyesters are susceptible to degradation by ultraviolet light
- Done by process that attacks the a-hydrogen
Polyesters more resistant
- Used in polyurethane coatings for short-term outdoor use
Polyesters are insufficiently resistant to moisture
Terathane® can become resistant to ultraviolet light by adding ultraviolet stabilizers
- Mainly “Tinuven” (Ciba-Geigy)