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:
May. 30, 2006
Filed:
May. 20, 2004
Ryoji Otaki, Kanagawa, JP;
Tomomichi Kanda, Kanagawa, JP;
Ryoji Otaki, Kanagawa, JP;
Tomomichi Kanda, Kanagawa, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
In the production method of the present invention, the polyamide is produced by the polycondensation of a diamine component and a dicarboxylic acid component comprising a straight-chain α,ω-aliphatic dicarboxylic acid and an aromatic dicarboxylic acid. The dicarboxylic acid component is first made into a suspension phase of the solid aromatic dicarboxylic acid in a molten straight-chain α,ω-aliphatic dicarboxylic acid. A part of the diamine component is added while the reaction system is in the suspension phase. Then, the reaction system is made into a homogeneous molten phase, to which the rest of the diamine component is added. Finally, the reaction system is kept at temperatures within a specific range to complete the polycondensation.