Process for producing an oligoester and producing unsaturated polyester resin by use thereof
US4306056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1980 |
| Grant date | Dec 15, 1981 |
| Priority date | — |
| Expiry date | May 16, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Processes for producing an oligoester and producing unsaturated polyester resin by use of the oligoester using unsaturated dibasic acid or its anhydride and isophthalic acid as dibasic acid components, and propylene oxide as a polyol component, characterized by (a) the step of reacting isophthalic acid with propylene oxide in the presence of an amine compound catalyst to form an oligoester, (b) the step of removing volatile components from the oligoester by heating it at a temperature range of 180.degree.-300.degree. C., (c) the step of treating the resulting oligoester with silica-alumina compound having adsorbing property, and (d) the step of reacting the oligoester so treated with the unsaturated dibasic acid or its anhydride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.