Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1981-05-18
1983-05-24
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264 28, 2642893, 2642902, 264346, 5263481, 5263486, D01D 512
Patent
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: 3226459 (1965-12-01), Tijunelis
patent: 3450805 (1969-06-01), Chesser
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patent: 3558580 (1971-01-01), Orser
patent: 4138458 (1979-02-01), Skilling
R. Stein and B. Rhodes, Journal of Applied Physics, 31, 1873 (1960).
Czaja Donald E.
Gilman Michael G.
Huggett Charles A.
Mobil Oil Corporation
Thompson W.
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