Modified rosin ester preparation
US4643848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1986 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Feb 21, 2006 |
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 of rosin with an unsaturated dibasic acid to form a modified rosin for subsequent esterification with a polyhydric alcohol. According to the process of the invention, a rosin is reacted with an unsaturated dibasic acid such as maleic anhydride or fumaric acid in the presence of phosphinic acid at a temperature of from about 180.degree. C. to about 220.degree. C. When the modified rosin is subsequently esterified, the rosin ester exhibits improved color, softening point, and viscosity in a specified solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.