Process for the production of thin stretched films from polyolef

Details Process for the production of thin stretched films from polyolef Process for the production of thin stretched films from polyolef

1988-07-25

1990-08-14

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642107, 2642358, 2642902, 264344, 5263481, B29C 5514, B29C 6900

Patent

active

049485440

ABSTRACT:
A process is disclosed for producting thin stretched films having a thickness between 0.1 and 20 .mu.m from polyolefins of ultrahigh molecular weight by dissolving the polyolefin in a solvent, shaping the solution at a temperature above the solution temperature of the polyolefin to a tape, cooling the tape to a temperature below the solution temperature to obtain gelation and stretching the gelled tape. In this process the gelled tape is initially subjected to a preliminary orientation in one direction, under solvent removal, and is then stretched in a direction essentially perpendicular to the direction of preliminary orientation, at elevated temperature, followed by final stretching to obtain the finished thin films. This process makes possible the production of films which are free from pores, that is to say transparent and which posses high Young's moduli, high tensile strengths and favorable values for elongation at break.

REFERENCES:
patent: 3996171 (1976-12-01), Holland et al.
patent: 4413110 (1983-11-01), Kavesh et al.
patent: 4551296 (1985-11-01), Kavesh et al.
patent: 4600633 (1986-07-01), Kono et al.
patent: 4625372 (1989-12-01), Hufnagel et al.
patent: 4663101 (1987-05-01), Kavesh et al.

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