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. 19, 2018
Filed:
Jul. 02, 2014
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Nobuhide Tsunaka, Kanagawa, JP;
Takafumi Oda, Kanagawa, JP;
Jun Mitadera, Kanagawa, JP;
Tomonori Kato, Kanagawa, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
A polyamide resin is produced through polycondensation by melt-kneading a polyamide oligomer having a relative viscosity of from 1.1 to 1.3 and a water content of 3% by mass or less in a cylinder (S) of an extruder. The extruder includes open vents (OV) and (OV) and vacuum vents (V) and (V). The open vent (OV) is arranged near a supply port (A), e.g., above the supply port (A), and a pressure-decreasing element (Y) is arranged on an upstream side with respect to positions of the vacuum vents (V) and (V). In addition, the open vent (OV) is arranged in a preceding area (OA) and is brought into a pressurized state.