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. 06, 2014
Filed:
Nov. 19, 2007
Ryuuji Uchimura, Kitakyushu, JP;
Hideki Murakami, Kitakyushu, JP;
Ryuuji Uchimura, Kitakyushu, JP;
Hideki Murakami, Kitakyushu, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
The object of the present invention is to provide a production method for an aromatic polycarbonate, in which eye boogers at the time of extrusion molding are reduced, and a continuous operation for a long period of time is possible. The present invention relates to a method when an extrusion molding is produced using an extruder in which a tapered parthas a half apex angle of from 4 to 20° formed at the outlet part of a die hole, and outlet parts of plural die holesare arranged in a staggered state at the resin discharge surface side of a die plate, the shear rate γ at the extruder outlet is from 100 to 500 sec, and the shear stress τ is from 50 to 200 kPa.