Process for manufacturing liquid epoxy resins

US8461286B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Thomas C. Young · Lake Jackson, US
• Clinton J. Boriack · Freeport, US
• Elwin G. Collier · Houston, US
• Robert M. Drake · Lake Jackson, US
• Joachim Drewing · Hollern-Twielenfleth, DE
• Edward Kronenberger · Missouri City, US
• Shuji Maeda · Tokyo, JP
• Paulo Alfonso Dos Santos Pereira · Lake Jackson, US
• Andreas Tigges · Stade, DE
• Roland Werner · Basel, CH
• Mark S. Burkinshaw · Lake Jackson, US

Key dates

• Filing date: Mar 24, 2009
• Grant date: Jun 11, 2013
• Expiry date: Jan 3, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G59/063
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.