Benzoxazolyl optical brightners in and for thermoplastic compositions
US5512620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | May 5, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/134
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Benzoxazolyl brightner compounds and thermoplastic combinations containing such are provided herein. The thermoplastic compositions comprise a thermoplastic resin, a phosphite heat stabilizer present in reduced levels, a brightner present in reduced levels and a pigment. Preferably the thermoplastic resin composition is transparent in nature. The compositions are useful for making molded and blow molded articles which require high levels of transparency, for example, glazing materials such thermoplastic windows. The composition exhibits enhanced appearance, namely a bright natural color in combination with low levels of yellowness by utilizing in combination reduced levels of phosphite and reduced levels of brightner, with moderate levels of pigment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.