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:
Sep. 11, 2018
Filed:
Jan. 09, 2014
Kureha Corporation, Tokyo, JP;
KUREHA CORPORATION, Tokyo, JP;
Abstract
A poly-L-lactic acid (PLLA) solid-state extrusion molded article having a weight average molecular weight of from 100,000 to 380,000 and a melt viscosity of from 20 to 2,000 Pa·s (at a temperature of 240° C. and a shear rate of 120 sec) and having an L-form content of from 80 to 100%, the article having a thickness or diameter of from 10 to 500 mm and a tensile strength of from 5 to 100 MPa at a temperature of 66° C. (the article may contain a filler and have a tensile strength of from 5 to 200 MPa); a downhole tool member or a ball sealer for well drilling and completion formed by machining the solid-state extrusion molded article; an isolation plug provided with the downhole tool member; and a production method for a PLLA solid-state extrusion molded article comprising steps of supplying a resin material containing a PLLA to an extruder, solid-state extrusion molding the material, pressurizing the solid-state extrusion molded product, drawing the pressurized product while applying a back pressure in the direction of a forming die to suppress the expansion of the solid-state extrusion molded product; and a well drilling and completion method.