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Specialty Chemicals Business Unit provides Light stabilizers, UV masterbatch and textile auxiliary for improving light fastness.

The synthetic of polymer materials such as various plastics, synthetic rubber, synthetic fibers, coatings, adhesives are due to have excellent mechanical, electrical and processing properties; therefore widely been used in the packaging, containers, housings, automotive parts (inside and outside). These polymer materials are in outdoor will be due to ultraviolet radiation (UV), heat, oxygen, metal ions, results of degradation are the deterioration of the exposed polymer material’s appearance, such as surface yellowing, gloss reduction, softening, embrittlement and cracking, and changes in physical-mechanical properties such as tensile strength, impact strength, etc. also decreased significantly. Degradation of polymer materials caused by a number of factors, the most important factor is UV-irradiation, when light stabilizers are required for protecting from UV degradation, and to extend the life of polymer materials.

A typical how to prevent degradation from photo-oxidation is represented in Figure 1.

Fig. 1：how to prevent degradation from photo-oxidation

Light Stability of polymer regular use of the following methods:
(1)Absorption or shielding ultraviolet(UV-Cut).
(2) Decomposition of ROOH.
(3) Add Qnencher, so that excited states restore the original states.
(4) Catch free radicals.

In order to obtain a high degree of stability of the effect, the processing conditions, the use of the environment and light stabilizers function have to be fully taken into account in order to select the appropriate formula.

In the PU / TPU materials yellowing, mainly due to deterioration resulting from photo-oxidation, and the light stabilizers to prevent PU / TPU material degradation due to photo-oxidation arising from yellowing, but also said the anti-yellowing agent.

The demand for protection against harmful solar irradiation is very important, light stabilizers in everyday life is exemplified in various applications, e.g. sunscreen cosmetics, automotive coatings, plastics, textiles and optical-electronic industries.

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