Alternating block copolymers of polyarylene polyethers and process for their preparation
US4749756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1987 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Jan 16, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/05
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A modified Williamson etherification in the presence of phase transfer catalyst is used to synthesize alternating block copolymers and regular copolymers. Unsaturated polyethers of a polynuclear dihydric phenol containing chloroallylic (electrophilic) end groups (prepared from cis- or trans-1,4-dichloro-2-butene and Bisphenol A) and aromatic poly(ether sulfone)s containing terminal phenol (nucleophilic) groups are polycondensed in the presence of tetrabutylammonium hydrogen sulfate as phase transfer catalyst to give alternating block copolymers. The same telechelic polymers were chain-extended with dinucleophilic or dielectrophilic monomers under similar reaction conditions. Both the regular copolymers and the alternating block copolymers were characterized by gel permeation chromatography and DSC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.