Blended aromatic and diether condensation polymerization reflux solvent
US5854340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Sep 24, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/81
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides (a) a reflux solvent for condensation polymerization which is an admixture blend of a diether described by the formula R.sub.1 --O--(CH.sub.2 --CHR.sub.2 --O).sub.n --R.sub.1 having a weight percentage between about 15 percent to about 60 percent (where R.sub.1 is independently selected from C.sub.1 -C.sub.6, R.sub.2 =CH.sub.3 or C.sub.2 H.sub.5, and n=1-3), and a second fluid which is an aromatic petroleum distillate solvent characterized as having an essential preponderance of aromatic distillates and having a boiling temperature between about 136.degree. C. to about 232.degree. C., where the admixture has an autoignition temperature greater than about 300.degree. C. and the admixture does not solubilize water to above a concentration of about 2 weight percentage of water in the weight of the admixture and the water; (b) particular reflux solvent blends of dipropylene glycol dimethyl ether and aromatic petroleum distillate solvent as admixtures having a dipropylene glycol dimethyl ether percentage in excess of about 15 percent and less than about 60 percent; (c) a vaporous heterogeneous azeotrope generated when the solvent admixture is added to the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.