Process for producing blown film of butene-1 polymer
AssigneesIdemitsu Petrochemical Co., Ltd., Neste Oy
InventorsTakashi Yamawaki, Takeshi Yamada
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Abstract
This invention provides a process for producing a blown film of butene-1 polymer excellent in elasticity, elastic recovery, impact strength and the like which includes extruding a butene-1 polymer having a melt index of 0.3-10 g/10 min in a tubular form from extrusion die at an extrusion temperature of 120.degree.-250.degree. C. and then inflation molding the tubular film under the conditions that frost line height is 38-100 cm, stretch ratio in machine direction is 5 or more and ratio of stretch ratio in machine direction/stretch ratio in transverse direction is 2.5 or more.
Claims8
A process for producing a blown film of butene- 1 polymer Which comprises extruding a butene-1 polymer having a melt index of 0.3-10 g/10 min in a tubular form from an extrusion die at an extrusion temperature of 120.degree.-250.degree. C. and then inflation molding the tubular film under the conditions that frost line height is 38-100 cm, stretch ratio in machine direction is 6-20, stretch ratio in transverse direction is about 2.1, and ration of stretch ratio in machine direction/stretch ratio in transverse direction is 3.0-10.0.
Dependencies are inferred from the claim text.