Process for preparing rosin and colorless rosin comprising disproportionation and dehydrogenation
US5395920A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1994 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Jul 26, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09F1/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for preparing a rosin ester, which comprises esterifying a purified product of a disproportionated rosin with an alcohol, and then subjecting the esterified rosin to dehydrogenation in the presence of a dehydrogenating catalyst, a process for preparing a rosin ester, which comprises heating a purified rosin and an alcohol in the presence of a disproportionating catalyst, simultaneously subjecting the resulting rosin to disproportionation and esterification, dehydrogenating the reactant in the presence of a dehydrogenating catalyst, and thereafter adding an organic phosphorus compound to the reaction system, a process for preparing a colorless rosin, which comprises simultaneously subjecting a purified rosin to disproportionation and dehydrogenation in the presence of a catalyst, and then adding an organic phosphorus compound to the reaction system and a process for preparing a colorless rosin, which comprises dehydrogenating a purified disproportionated rosin in the presence of a dehydrogenating catalyst. According to the present invention, rosin esters and colorless rosins which have remarkably improved various properties from the viewpoi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.