Polypropylene laminated film

B - Operations – Transporting – 32 – B

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B32B 27/32 (2006.01) C08F 210/06 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2138747

A polypropylene laminated film containing a crystalline polypropylene layer and, laminated on at least one side of the layer of the crystalline poly- propylene, a layer of a copolymer of propylene and at least one .alpha.-olefin of from 4 to 10 carbon atoms having a specific composition, melt flow rate and molecular weight distribution in which the .alpha.-olefin content in the cold xylene soluble portion of the random copolymer is less than 1.7 times the .alpha.-olefin content in the copolymer and the random copolymer satisfies the mathe- matical expression, B ? 1.05A - 10, wherein A is a weight percentage of the content of said at least one .alpha.-olefin having from 4 to 10 carbon atoms in the random copolymer and B is a weight percentage of the cold xylene soluble portion in the random copoly- mer, is superior in low temperature heat sealability and hot tack property and moreover has a good trans- parency, blocking resistance and printability, wherein the random copolymer is obtained by gas phase polymerization substantially in the absence of a liquid medium, and using a catalyst system comprising (i) a solid catalyst component containing magnesium, titanium and a halogen as essential constituents, (ii) an organoaluminum compound and (iii) an electron donative compound.

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