Titanium oxide sol and process for producing polyalkylene terephthalate therewith
US7759270B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2006 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | May 22, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/183
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An environmentally friendly polymerization catalyst for polyalkylene terephthalate which does not use a heavy metal such as antimony, and a method for producing polyalkylene terephthalate using the catalyst. The catalyst for polymerizing a polyalkylene terephthalate is a titanium oxide sol containing an organic solvent as a dispersion medium, the sol has a light transmittance of not less than 50%, the light transmittance being measured by adjusting a concentration of the titanium oxide in the sol to 0.7 g/L and setting an optical path length to 1 cm in a wavelength range of 400 to 800 nm, and the amount of hydroxyl groups per 1 g of titanium oxide is not less than 1.8 mmol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.