The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2013
Filed:
Mar. 24, 2009
Thomas C. Young, Lake Jackson, TX (US);
Clinton J. Boriack, Brenham, TX (US);
Elwin G. Collier, Houston, TX (US);
Robert M. Drake, Richwood, TX (US);
Joachim Drewing, Hollern-Twielenfleth, DE;
Edward J. Kronenberger, Missouri City, TX (US);
Shuji Maeda, Lake Jackson, TX (US);
Paulo Alfonso Dos Santos Pereira, Lake Jackson, TX (US);
Andreas Tigges, Stade, DE;
Roland Werner, Hamburg, DE;
Mark S. Burkinshaw, Lake Jackson, TX (US);
Thomas C. Young, Lake Jackson, TX (US);
Clinton J. Boriack, Brenham, TX (US);
Elwin G. Collier, Houston, TX (US);
Robert M. Drake, Richwood, TX (US);
Joachim Drewing, Hollern-Twielenfleth, DE;
Edward J. Kronenberger, Missouri City, TX (US);
Shuji Maeda, Lake Jackson, TX (US);
Paulo Alfonso Dos Santos Pereira, Lake Jackson, TX (US);
Andreas Tigges, Stade, DE;
Roland Werner, Hamburg, DE;
Mark S. Burkinshaw, Lake Jackson, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
A process for the production of liquid epoxy resins, including: contacting a polyhydric phenol and an epihalohydrin in the presence of an ionic catalyst to form a halohydrin intermediate reaction product; concurrently: reacting a portion of the halohydrin intermediate reaction product with an alkali hydroxide to form a solid salt suspended in a liquid mixture including a dehydrohalogenated product and unreacted halohydrin intermediate, wherein the alkali hydroxide is used at less than a stoichiometric amount; and removing water and epihalohydrin as a vapor from the reacting mixture; separating the solid salt from the liquid mixture; reacting at least a portion of the unreacted halohydrin intermediate with an alkali hydroxide in the presence of water to form an organic mixture including an epoxy resin and unreacted epihalohydrin and an aqueous solution including a salt; separating the aqueous mixture from the organic mixture; and separating the unreacted epihalohydrin from the liquid epoxy resin.