Process for producing stretched article of ultrahigh-molecular w

Details Process for producing stretched article of ultrahigh-molecular w Process for producing stretched article of ultrahigh-molecular w

1989-10-16

1991-10-08

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642104, 2642106, 2642107, 2642108, 26421115, 26421116, 26421122, D01F 604, D01D 512

Patent

active

050552481

ABSTRACT:
Stretched articles of ultrahigh-molecular-weight polyethylene are prepared by melt-kneading a mixture of ultrahigh-molecular-weight polyethylene with an aliphatic compound (b.sub.1) of at least 8 carbon atoms having a melting point of at least 10.degree. C. and a boiling point of at least 130.degree. C. in a screw extruder while maintaining the mixture at a temperature from the melting point of the mixture to 300.degree. C. The molten mixture is melt-extruded through a die at a temperature from the melting point of the mixture to 300.degree. C. and the resulting unstretched extrudate is cooled to solidify it. The unstretched solidified extrudate is then subjected to a stretching treatment at a temperature of the melting point of the aliphatic compound (b.sub.1) to a point 20.degree. C. above the melting point of the mixture at a particular stretch ratio.

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