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Color Stability
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Polyurethane adhesives made from aliphatic isocyanates are well known for their color
stability upon ageing thanks to:
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The lack of phenyl group
It makes polyurethane adhesives prepared from aliphatic isocyanates less prone to
oxidation than those prepared with an aromatic hardener
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The superior resistance of the urethane bond when exposed to UV light
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The use of aliphatic isocyanates is particularly suitable when adhesives are visible
from end-users. In outdoor applications, the material needs to keep the
original color as long as possible in order to maintain aesthetics at its best level.
In these typical applications, polyurethane adhesives made from aliphatic isocyanates
are recommended for their non-yellowing property as for their exceptional
physical resistance.
The following graph compares the color stability of PU adhesives based on aliphatic
and aromatic isocyanates:
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Figure 1:
Window Sealing
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Figure 1: Impact of the type of isocyanates
on color retention
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