Hindered amine light stabilizers in pigmented coatings |
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Authors: | Christian Schaller Daniel Rogez Adalbert Braig |
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Affiliation: | (1) Ciba Inc., Klybeckstr 141, 4002 Basel, Switzerland |
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Abstract: | It is common practice to combine hindered amine light stabilizers (HALS) with UV absorbers (UVA) for optimal protection of
coatings and plastics. The ratio of UVA and HALS strongly depends on the concentration of pigments (acting as UVA) used in
the paint; that is, a clearcoatings require higher amounts of UVA, whereas opaque pigmented coatings require higher amounts
of HALS. Here, especially basic HALS types can interfere with paint components like, for example, pigments due to acid/base
interactions. In this article, we want to discuss the influence of HALS basicity on long-term performance in opaque white
pigmented solventborne (SB) and waterborne (WB) coatings for industrial applications in correlation to the quality of the
used TiO2. |
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Keywords: | UV stabilization Coating stabilization UV absorbers (UVA) Hindered amine light stabilizers (HALS) Pigmented coatings Titanium dioxide |
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