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:
Jul. 04, 1995
Filed:
Jun. 13, 1994
Hisasi Shono, Matsuyama, JP;
Kazuhiro Sato, Matsuyama, JP;
Koji Sumitani, Koganei, JP;
Yukio Kuninobu, Matsuyama, JP;
Teijin Limited, Osaka, JP;
Abstract
A method for recovering dimethyl naphthalene-2,6-dicarboxylate (DMN) from a mixture of dimethyl naphthalene-2,6-dicarboxylate (DMN) and dimethyl terephthalate (DMT), which comprises recrystallizing said mixture in a mixed medium of ethylene glycol and methanol, said mixed medium containing 10 to 60% by weight of ethylene glycol, and separating precipitated dimethyl naphthalene-2,6-dicarboxylate (DMN). According to this invention, DMN can be recovered with high yield from a mixture of DMN and DMT which is obtained from depolymerization of a mixed polymer of polyethylene-2,6-naphthalenedicarboxylate and polyethylene terephthalate.