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. 19, 2007
Filed:
Nov. 09, 2004
Wen-chiung Su, Taipei, TW;
Tseng-rong Wu, Yonghe, TW;
Chin-shang Sheng, Longtan Township, Taoyuan County, TW;
Wen-Chiung Su, Taipei, TW;
Tseng-Rong Wu, Yonghe, TW;
Chin-Shang Sheng, Longtan Township, Taoyuan County, TW;
Chung Shan Institute of Science & Technology, Taoyuan, TW;
Abstract
A method for preparing an arylphosphonite antioxidant of the formula (I) below is disclosed, wherein Ar is First, the reactants 2-phenylphenol and phosphorus trichloride are heated under the existence of a zinc chloride catalyst for producing 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorin (CDOP) of the formula (II) below: Next, the excess phosphorus trichloride is removed. Finally, an organic solution of a di-hydroxylphenol compound of the formula (III),Ar—(OH)  (III)wherein Ar is defined as the above, is heated with the CDOP of formula (II) to form the product of the formula (I).