Low dusting crystal transformations of 2,2′-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazolylphenol] and mixture thereof, method for preparing them, and ultraviolet light absorber using them
US7326744B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2002 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Jun 5, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L69/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a low dusting crystalline 2,2′-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazolylphenol] type I crystal transformation which exhibits diffraction peaks at diffraction angles (2θ±0.1°) of 7.1°, 8.6°, 14.3°, 16.1°, 18.1° and 23.0° in powder X-ray diffraction analysis with Cu-Kα radiation; a low dusting 2,2′-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazolylphenol] type II crystal transformation which does not exhibit a distinct diffraction peak but an amorphous halo in powder X-ray diffraction analysis with Cu-Kα radiation; a mixture thereof; a method for preparing them; and a UV light absorber, an emulsion composition and a polymer material using them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.