Process for producing blown film of butene-1 polymer

Details Process for producing blown film of butene-1 polymer Process for producing blown film of butene-1 polymer

B - Operations, Transporting

29

C

18/521

B29C 49/04 (2006.01) B29C 47/00 (2006.01) C08J 5/18 (2006.01)

Patent

CA 1287715

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 comprises 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 120-250°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.

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