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US 2003/0073802 A1Published application
Process for preparing epoxy resin
AssigneeDainippon Ink and Chemicals, Inc.
InventorsIchiro Ogura, Kazuo Arita
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AssigneeDainippon Ink and Chemicals, Inc.
InventorsIchiro Ogura, Kazuo Arita
Estimating the term…
Energy cost is reduced and reuse efficiency of epihalohydrin and industrial productivity in the process for preparing an epoxy resin, which uses a recovered epihalohydrin having a low glycidol content, are remarkably improved. In the process for preparing an epoxy resin by reacting a polyhydric phenol compound with epihalohydrin in a water-soluble organic solvent in the presence of an alkali reactive catalyst, first, a first recovered fraction containing a small amount of the by-product glycidol is recovered while continuously distilling a distilled component from the crude reaction product after the completion of the reaction, and then a second recovered fraction containing a small amount of the water-soluble organic solvent is recovered and, furthermore, the second recovered fraction is washed with water to obtain a purified fraction and the purified fraction is used as a raw material for synthesis of the epoxy resin, together with the first recovered fraction.
A process for preparing an epoxy resin by reacting a polyhydric phenol compound with epihalohydrin in a water-soluble organic solvent in the presence of an alkali reactive catalyst, which comprises the steps of:
Dependencies are inferred from the claim text.