Process for preparing biaxially oriented films of butene-1 homop

Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion

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264 28, 2642893, 2642902, 264346, 5263481, 5263486, D01D 512

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active

043850227

ABSTRACT:
A process for making a film of butene-1 homopolymer and copolymers of improved strength and clarity and the film made thereby. Such a film is produced by quenching an extruded poly(butene-1) homopolymer or copolymer while in the amorphous state, preferably at temperatures below O.degree. C., and biaxially stretching the quenched film before substantial crystallization occurs. Subsequent heat setting of the film at a temperature above the stretching temperature, but below its melting point, produces a heat stable film of high break strength and clarity, suitable as a food wrap or food container overwrapping material.

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patent: 3468862 (1969-09-01), Schotland
patent: 3558580 (1971-01-01), Orser
patent: 4138458 (1979-02-01), Skilling
R. Stein and B. Rhodes, Journal of Applied Physics, 31, 1873 (1960).

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