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    • 10. 发明专利
    • POLYMERIC FILM
    • AU1177076A
    • 1977-09-15
    • AU1177076
    • 1976-03-08
    • ICI LTD
    • BALLARD DENIS GEORGE HAROLDJONES ERICPADGET JOHN CHRISTOPHER
    • C08F210/00B29C47/00B29C49/00B29C55/00B29C55/28C08F210/16C08J5/18B29D7/24
    • 1532780 Polyolefine films IMPERIAL CHEMICAL INDUSTRIES Ltd 8 March 1976 [7 March 1975] 9562/75 Heading B5B A film is formed from a copolymer of ethylene with at least one mono-α-olefine comonomer which film has an impact strength and a stiffness modulus which are such that the impact-stiffness function defined by the relationship is at least 750. In a preferred film the stiffness modulus is 200-400 MNm -2 the tear strength is at least 5 g/micron of film thickness in both machine and transverse directions, the tensile strength at break measured at a straining rate of 500 mm/minute is at least 20 MN/m 2 , the elongation of break measured at a straining rate of 500 mm/min. is 300-1100%, the density is 915-935 kg/m 3 , an annealed density of 918- 940 kg/m 3 the melt flow index measured at 190‹ C. using a weight of 2À16 kg is 0À05-0À7, an apparent viscosity measured at 200‹ C. and a shear rate of 100 sec -1 of 0À5 x 10 3 -3 x 10 3 NSm -2 and a viscosity at 200‹ C. and a stress of 10 3 N/m 2 which is at least 2 Ac (1À6 A Î 10 -3 ) and not more than 1000 A where A is the apparent viscosity and a sheer rate of 100 sec -1 and the relationship has a value of at least 18,000. The copolymer is preferably one of ethylene and a comonomer of which at least 50% molar of the mono-α-olefine has 5 or more carbon atoms. The film is formed by extrusion through an annular die followed by inflation.