Rosin pentaerythritol ester preparation improvement
US4548746A · kind A · utility
20Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1984 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Dec 10, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09F1/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Phosphinic acid (also called hypophosphorous acid), when used in very small quantities, is disclosed to act as a catalyst to accelerate the reaction rate of esterification of rosin with pentaerythritol. According to the process of the invention, a rosin is reacted with at least an equivalent amount of pentaerythritol in the presence of phosphinic acid at a temperature of from about 180.degree. C. to about 300.degree. C. When tall oil rosin is esterified by the invention process, a rosin ester is produced without appreciable color degradation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.