Oriented polyolfins

Details Oriented polyolfins Oriented polyolfins

1990-03-07

1991-03-19

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263481, 26417713, C08F 1002

Patent

active

050012061

ABSTRACT:
The present invention relates to an orientated polyolefin composition comprising an olefin (co)polymer having a weight average molecular weight (Mw) from 30,000 to 1,000,000 and a high molecular weight tail extending to molecular weights above 1,000,000, and has a microstructure which is substantially parallel chain extended cores of the component polymer(s) and associated lamellar overgrowths extending in planes normal to the cores. The lamellar overgrowths an adjacent cores intermesh and are capable of sustaining a haul off tension of at least 10 MPa without breaking during its extrusion.
The orientated polyolefin composition is produced by extruding an olefin copolymer through a die under a pressure of about 5-10 MPa, at a temperature above the self-blocking temperature thereof and by hauling off the extrudate at a tension of at least 10 MPa without breaking. The extrudates so produced have a high modulus.

REFERENCES:
Odell et al, Polymer, vol. 19, (1978) pp. 617-626.

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