Process for the preparation of polymer compositions having low volatile content
US4537954A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 8, 1984 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Mar 8, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A continuous process for the preparation of polymer compositions having low volatile content which comprises passing a styrene polymer-containing polymerization fluid composition obtained by solution polymerization or bulk polymerization through a volatile component separator comprising vertical foaming preheaters and vacuum vessels directly connected therewith and thereby removing volatile components continuously from the polymerization fluid composition in three stages to obtain a polymer composition having low volatile content, the process being characterized in that each of three stages includes at least one vertical foaming preheater and one vacuum vessel, the first stage is carried out under such pressure and temperature conditions that the polymerization fluid composition leaving this stage contains said styrene polymer in an amount of 60 to 80% by weight and the temperature of the polymerization fluid composition passing through this stage lies between 70.degree. and 120.degree. C., the second stage is carried out under such pressure and temperature conditions that the molten polymer composition leaving this stage has a volatile content of not greater than 1% by weight and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.