Process for producing aromatic polyesters
US4311823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1979 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Dec 31, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/605
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a process for producing aromatic polyesters by bulk condensation of polyester forming reactant the improvement which comprises using three reaction vessels, reacting a reactant compound with an acid anhydride to effect an alkanolylation reaction in the first reaction vessel to thereby prepare a monomer, removing the acids by-produced in said reaction, forming or not forming an oligomer from a part or whole of said monomer, then transferring the reaction product of the first vessel into the second reaction vessel, polycondensing said monomer and/or oligomer to produce a prepolymer in the second reaction vessel, transferring the reaction product of the second vessel into the third reaction vessel, and heating said prepolymer in said third reaction vessel, thereby obtaining an aromatic polyester of high polymerization degree.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.