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:
Sep. 02, 2014
Filed:
Jun. 21, 2011
Kiyoharu Hirao, Tokyo, JP;
Katsuichi Ohtsuki, Osaka, JP;
Hiroshi Tsuji, Osaka, JP;
Hiroki Sato, Tokyo, JP;
Kiyoharu Hirao, Tokyo, JP;
Katsuichi Ohtsuki, Osaka, JP;
Hiroshi Tsuji, Osaka, JP;
Hiroki Sato, Tokyo, JP;
Daihachi Chemical Industry Co., Ltd., Osaka, JP;
Abstract
A method for producing an aromatic diphosphate comprising: Step 1 which is a step where a specific aromatic monohydroxy compound having a steric hindrance group at ortho-positions is made to react with phosphorus oxyhalide in the presence of a Lewis acid catalyst and then the unreacted phosphorus oxyhalide is removed under a reduced pressure to give a specific; and Step 2 which is a step where the reaction product obtained in the above step is made to react with a specific aromatic dihydroxy compound in an amount of 0.5 mol to 1 mol of halogen contained in the reaction product in the presence of a Lewis acid catalyst to give a specific aromatic diphosphate.