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

1988-05-27

1990-03-06

Thurlow, Jeffrey

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264569, 4253261, B29C 4720

Patent

active

049064290

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.

REFERENCES:
patent: 3551540 (1970-12-01), Pellicciari
patent: 3576051 (1971-04-01), Click et al.
patent: 3721269 (1973-03-01), Choate et al.
patent: 4000234 (1976-12-01), Pilgrim et al.
patent: 4176148 (1979-11-01), Magder et al.

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