Method for the manufacture of poly(aliphatic ester-carbonate)s and uses thereof
US10746676B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2016 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Jan 26, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/442
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An interfacial process for preparing a poly(aliphatic ester-carbonate) includes providing an initial polymerization reaction mixture comprising an aliphatic C6-20 dicarboxylic acid, a bisphenol, an alkali hydroxide, and optionally a catalyst in a solvent system comprising water and an immiscible organic solvent, adding an initial portion of a carbonyl dihalide over a first time period while maintaining the reaction at a first pH from 7 to 8; and adding a second portion of the carbonyl dihalide over a second, subsequent time period while maintaining the reaction pH at a second pH from 9 to 12, to provide a product polymerization mixture, wherein the amount of alkali hydroxide in the initial polymerization reaction mixture is effective to increase the fraction of the first time period at a measured pH of 7 to 8 compared to the same reaction mixture with a higher amount of alkali hydroxide in the initial polymerization mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.