Process for removing residual salts from epoxy novolacs
US4696982A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1986 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Sep 17, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G59/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for purification of phenolic epoxy novolac or phenolic derivative epoxy resin intermediates is disclosed. At the time of manufacture, the epoxy resin is a flowing stream with a solvent and with impurities, typically being dispersed residual salt ions, particles of the catalyst used in the manufacturing process, and solidified polymer. The epoxy resin is mixed with water dispersed therethrough in droplet form. Then, the epoxy resin is flowed through an electrostatic coalescer means. The water droplets are coalesced and form a water phase in the bottom of the coalescing means, thereby picking up substantially all the impurities. As desired, two or more electrostatic coalescing means can be cascaded to obtain a desired degree of purification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.