Inverse interfacial polymerization for preparing certain halogenated aromatic polyesters
US4066623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Oct 26, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/6826
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for preparing certain halogenated aromatic polyesters by an inverse interfacial polymerization technique. More specifically, the present invention offers a method for substantially reducing the amount of low molecular weight fraction which accompanies the formation of these polyesters when prepared by standard interfacial polymerization techniques by (1) inverting the order of addition of one phase to the other, i.e. by adding the aqueous phase to the organic phase, (2) controlling the rate of addition of the aqueous phase to the organic phase and (3) adding the catalyst to the organic phase prior to the addition of the aqueous phase thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.