Patents by Inventor Tadatoshi Yoshimura

Tadatoshi Yoshimura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for preparing tetrakis [3-(3,5-dibutyl-4-hydroxyphenyl)propionyloxymethyl] methane
    Patent number: 4547585
    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.
    Type: Grant
    Filed: May 25, 1982
    Date of Patent: October 15, 1985
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Toru Yamanaka, Tadatoshi Yoshimura