SOLIDIFICATION- AND EXTRUSION-MOLDED ARTICLE OF POLYGLYCOLIC ACID AND METHOD FOR MANUFACTURING SAME

摘要

Provided are: a polyglycolic acid (PGA) solidification- and extrusion-molded article that is formed from a resin material containing PGA, the PGA having a weight average molecular weight of 100,000 to 300,000 and a melt viscosity (temperature: 270° C.; shearing speed: 120 sec−1) of 100 to 2,000 Pa·s, and that has a tensile strength at a temperature of 150° C. of 20 to 200 MPa; a downhole tool or component thereof for drilling and completion of petroleum recovery formed by machining the solidification- and extrusion-molded article; an isolation plug provided with the component; an isolation plug mandrel; and a method for manufacturing the PGA solidification- and extrusion-molded article and a method for manufacturing the downhole tool or component thereof that comprise the steps of: supplying the resin material to an extruder (preferably from a fixed-quantity feeder); and after solidification- and extrusion-molding, pressurizing the solidification- and extrusion-molded article, and drawing the same while applying back pressure thereto in a direction of a forming die to suppress the expansion of the solidified and extruded matter.

主权项

1. A solidification- and extrusion-molded article of polyglycolic acid having a tensile strength at a temperature of 150° C. of 20 to 200 MPa; the solidification- and extrusion-molded article being formed from a resin material containing polyglycolic acid, the polyglycolic acid having a weight average molecular weight of 100,000 to 300,000 and a melt viscosity, measured at a temperature of 270° C. under a shearing speed of 120 sec−1, of 100 to 2,000 Pa·s.