Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – By casting liquids on a solid supporting or shaping surface
Patent
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).
Otsu Osamu
Yoshida Sumio
Jones Kenneth M.
Nippon Oil Co. Ltd.
Silbaugh Jan H.
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