Process for producing polyolefin materials

Details Process for producing polyolefin materials Process for producing polyolefin materials

1997-03-21

2000-01-25

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

264230, 2642896, 264342RE, 264DIG71, 2642107, B29C 4300, B29C 4322, B29C 4326

Patent

active

060174803

ABSTRACT:
A process for producing polyolefin materials is disclosed which comprises the steps of (a) preparing a molded article of an ultra-high-molecular-weight polyolefin having a viscosity-average molecular weight of more than 500,000; (b) stretching said article by more than thirty-fold; (c) contracting the thus stretched article to an extent ranging from 0.3 to 80% in the direction of stretch; and (d) re-stretching the thus contracted article. The resulting polyolefin materials are improved in mechanical strength and elasticity modulus.

REFERENCES:
patent: 4261944 (1981-04-01), Hufnagel et al.
patent: 5458841 (1995-10-01), Shirrell
patent: 5587122 (1996-12-01), Lennard
patent: 5741451 (1998-04-01), Dunbar et al.
Preprints of the Society of Polymer Science, Japan, vol. 34, No. 4, p. 873 (1985).

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