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US 4,230,818 AGranted
Reduction of glycol ethers in polyesters
AssigneeThe Goodyear Tire & Rubber Company
InventorsRoy M. Broughton, Jr., Douglas D. Callander, Brian W. Pengilly, Joseph P. Schirmer, Terence E. Winters
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Abstract
A process for reducing the glycol ether content in polyesters involves adding a glycol to a polyester oligomer solution prior to polymerization, distilling the oligomer solution to remove vapor containing the glycol as well as the glycol ether, and polymerizing the solution to produce a polyester containing a reduced glycol ether content.
Claims11
A process for reducing the glycol ether level in a polyester, comprising the steps of:
- reacting a dicarboxylic acid having from 8 to 16 carbon atoms selected from the group consisting of an aryl, and an alkyl substituted aryl compound with a glycol having from 2 to 12 carbon atoms to form a polyester oligomer solution, the equivalent ratio of said glycol to said dicarboxylic acid ranging from about 0.5 to about 2.5;
- subsequently adding after said reaction a vaporizable glycol containing from 2 to about 12 carbon atoms to said polyester oligomer solution;
- pressurizing with an inert gas said polyester oligomer solution containing said added vaporizable glycol to a pressure of from about atmospheric to about 100 psi;
- heating said oligomer solution to a temperature of from about 20.degree. C. below to about 100.degree. C. above the boiling point of said vaporizable glycol and generating vapors;
- and
- distilling said vapors so that said vaporizable glycol and said ether contained in said vapor is removed from said oligomer solution.
3 more elements
Dependencies are inferred from the claim text.