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:
Feb. 16, 2016
Filed:
Nov. 24, 2010
Applicants:
Minoru Kikuchi, Niigata, JP;
Katsumi Shinohara, Niigata, JP;
Inventors:
Minoru Kikuchi, Niigata, JP;
Katsumi Shinohara, Niigata, JP;
Assignee:
MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G 69/28 (2006.01); C08G 69/26 (2006.01);
U.S. Cl.
CPC ...
C08G 69/265 (2013.01); C08G 69/28 (2013.01);
Abstract
An economical batchwise production method of polyamide with good quality by the polycondensation in which a diamine component including 70 mol % or more of a xylylenediamine which includes 20 mol % or more of p-xylylenediamine is added to a dicarboxylic acid component in a batchwise reaction tank equipped with a partial condenser. The diamine component is added while maintaining the whole reaction system in fluid state under pressure. The pressure is reduced during the time that the molar ratio is within a specific range while continuing the addition.