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. 30, 2009
Filed:
Dec. 19, 2006
Applicants:
Ikutaro Kuzuhara, Okayama, JP;
Atsushi Iwamoto, Okayama, JP;
Inventors:
Ikutaro Kuzuhara, Okayama, JP;
Atsushi Iwamoto, Okayama, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 41/58 (2006.01);
U.S. Cl.
CPC ...
Abstract
In the method of producing ditrimethylolpropane of the present invention, the distillation still residue obtained in the production of trimethylolpropane is subjected to crystallizing treatment while strictly regulating the amount of organic solvent to be used, the crystallization temperature and the crystallization time within the specific ranges. With the method of the present invention, a highly pure di-TMP is obtained only by a single operation of the crystallization.