Loading patent…
AssigneeThe Dow Chemical Company
InventorsFelipe A. Donate, Joseph Warren Kappen, Debra Anne Timmers
Estimating the term…
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 environment of a condensation reaction and subsequently vaporized to remove water from the reaction environment in which the heterogeneous azeotrope is for the diether in a weight percentage between about 7 percent to about 20 percent of the azeotrope, water in a weight percentage between about 40 percent to about 60 percent of the azeotrope, and the aromatic petroleum distillate solvent as an essential third fluid; and (d) a method of preparing a polyester (e.g. an alkyd resin) using the steps of (1) reactively condensing together, in a reaction zone, an at least difunctional acid (or a reactive derivative thereof) and an at least difunctional alcohol (or a reactive derivative thereof) in the presence of one of the reflux solvents, and (2) azeotropically distilling from the reaction zone the reflux solvent and any water formed from the condensation reaction.
A condensation polymerization reflux solvent admixture comprising:
A condensation polymerization reflux solvent admixture comprising:
A method for preparing a condensation polymerization reflux solvent, the method comprising admixing:
A method for preparing a condensation polymerization reflux solvent, the method comprising admixing:
A heterogeneous azeotrope having:
Dependencies are inferred from the claim text.