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:
Oct. 15, 1985
Filed:
May. 25, 1982
Toru Yamanaka, Otake, JP;
Tadatoshi Yoshimura, Iwakuni, JP;
Mitsui Petrochemical Industries, Ltd., Tokyo, JP;
Abstract
Tetrakis [3-(3,5-dibutyl-4-hydroxyphenyl)propionyloxymethyl] methane having a high purity and excellent whiteness is prepared. In this process, an ester exchange reaction between a propionic acid ester having the general formula: ##STR1## wherein Bu is an n-, sec-, iso-, or tert-butyl group and R.sup.1 is an alkyl group having 1 to 4 carbon atoms, and pentaerythritol in the presence of an alkaline catalyst is effected by adding 0.2 through 1.8 mol of water based on 1 mol of the alkaline catalyst by the substantial completion of the ester exchange reaction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile