Preparation of poly(arylene ether ketones) by sequential oligomerization and polymerization in distinct reaction zones
US4843131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Oct 20, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G61/127
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of preparing a poly(arylene ether ketone) by a Friedel-Crafts polymerization wherein a gelled reaction mixture is produced, comprising the steps of: PA1 (A) forming, in a first reactor, a reaction mixture for polymerization comprising PA2 (I) a monomer system comprising PA3 (a) (i) phosgene or an aromatic dicarboxylic acid dihalide and (ii) a substantially stoichiometric amount of a polynuclear aromatic comonomer having two active hydrogen atoms or PA3 (b) a polynuclear aromatic carboxylic acid halide having an active hydrogen atom; and PA2 (II) a Lewis acid in an amount of at least one equivalent per equivalent of carbonyl groups in the monomer system, plus an amount effective to act as a catalyst for the polymerization; PA1 (B) permitting the reaction mixture to polymerize in the first reactor until substantial partial polymerization has occurred, but before substantial gelation of the reaction mixture; PA1 (C) transferring the partially polymerized reaction mixture into a second reactor having a nozzle at one end thereof and a piston which, in its retracted position, is at the other end of the second reactor and has a stroke substantially equal to the length of the seco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.