Photographs of Bushmen

Berner, Robert L.; Strauß, Peter

doi:10.2307/40130040

Cited by 1 publication

(3 citation statements)

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“…In two-coat metallic coatings, exposure to UV light, oxygen, moisture, and atmospheric pollution causes decomposition of the polymer material in the automotive finishes. This decomposition results in loss of gloss, crack formation, color changes, and delamination phenomena [369]. High-energy UV light is particularly detrimental because each polymer material can be damaged particularly easily at one or more wavelengths in the UV range.…”

Section: Light Stabilizersmentioning

confidence: 99%

“…The further the absorption edge extends into the near UV region, the more UV light can be filtered out. Of the four UV absorber classes shown above, the hydroxyphenylbenzotriazoles have the broadest absorption band [369,373]. In addition to thermal stability [373] and stability to extraction with water or organic solvents, photochemical stability is important [374][375][376].…”

Section: Uv Absorbers Four Different Classes Of Uv Absorbers Are Shomentioning

confidence: 99%

“…Ultraviolet reflection spectroscopy can be used to establish whether the employed UV absorber is still effective, even after several years' external weathering [377]. The hydroxyphenylbenzotriazoles have a much higher photochemical resistance than oxalic anilides and hydroxybenzophenones [369,373,378]. • South, black box unheated; percentage of light stabilizer relative to binder solids; benzotriazole I, 2- (2 H-benzotriazole-2-yl)-4,6-bis(1-methyl-1-phenylethyl) …”

Section: Uv Absorbers Four Different Classes Of Uv Absorbers Are Shomentioning

confidence: 99%

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Paints and Coatings

Stoye¹,

Funke²,

Hoppe³

et al. 2006

Ullmann's Encyclopedia of Industrial Chemistry

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Coatings are multi-component systems and surfaces/interfaces have a strong influence on their quality and play also an important role during paint application. Coating additives are used since many years successfully as "problem solvers" in coating formulations to overcome defects and in general to improve the overall quality. Many coating defects are closely connected with interfacial phenomena and therefore it is no surprise that oftentimes coating additives are surface active materials. Examples of typical coating defects are shown together with problem solutions using surface active coating additives. The development of coating additives is mainly driven by market needs. In the past excellent quality and performance had a very high priority. During the last 15 to 20 years the focus shifted more and more to ecological considerations. Less pollution of water and air is required and the range of raw materials from which the paint chemist can choose has shrunken (e.g., no more lead pigments, no more aromatic solvents). These changes are a constant challenge for additive producers. Coating additives normally do not trigger new developments in coatings but they can be the crucial factor to make a new and innovative coating system successful in the market.

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Section: Light Stabilizersmentioning

confidence: 99%