Process for producing highly oriented molded article of ultra-hi

Details Process for producing highly oriented molded article of ultra-hi Process for producing highly oriented molded article of ultra-hi

1989-09-13

1992-04-21

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264203, 2642107, 2642108, 26421113, 26421115, 264205, D01F 604

Patent

active

051065630

ABSTRACT:
A pre-oriented molded article of ultrahigh-molecular-weight polyethylene is composed of ultrahigh-molecular-weight polyethylene having an intrinsic viscosity of at least 5 dl/g, has a degree of orientation of at least 0.8, and has such a creep property that a stretched product of the molded article having a degree of orientation of about 0.97 shows an elongation of not more than 2% in an atmosphere at 80.degree. C. at 1000 seconds. The pre-oriented molded article is produced by (1) extruding a high-concentration molding solution composed of 15 to 80 parts by weight of ultrahigh-molecular-weight polyethylene and 85 to 20 parts by weight of a solvent capable of dissolving said polyethylene from a molding die at a temperature at which the molding solution remains a solution, (2) taking up the extrudate at a draft ratio of at least 3, and cooling the extrudate during or after take-up to crystallize the polyethylene in the extrudate and to form a pre-oriented molded article. A stretched molded article is produced from the pre-oriented molded article by (3) stretching the pre-oriented molded article at a stretch ratio of at least 3.

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European Search Report dated Nov. 19, 1987.

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