B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/140
B32B 27/32 (2006.01) C08L 23/14 (2006.01) C09J 3/14 (1985.01)
Patent
CA 1237649
ABSTRACT OF THE DISCLOSURE A laminated polypropylene film consisting of a crystalline polypropylene layer having laminated to at least one side thereof a copolymer layer, said copolymer being a random copolymer of propylene and an .alpha.-olefin having 4 or more carbon atoms or a random copolymer of propylene, an .alpha.-olefin having 4 or more carbon atoms and ethylene obtained by vapor phase polymerization in the substantial absence of a liquid medium and satisfying the following conditions (1) to (4): (1) the content of an .alpha.-olefin having 4 or more carbon atoms in the copolymer is 8 to 25 mole%, (2) the content of ethylene in the copolymer is 3 mole% or less, (3) the content of a cold xylene-soluble portion in the copolymer is 15 to 60% by weight, and (4) the content of a boiling n-heptane-insoluble portion in the copolymer is 7% by weight or more. Said laminated film has an excellent low-temperature heat- sealability, an excellent transparency, a low blocking and a good scratch resistance.
471099
Kitamura Shuji
Nakae Kiyohiko
Ogawa Tadatoshi
Sadatoshi Hajime
Yoshida Teruaki
Fetherstonhaugh & Co.
Sumitomo Chemical Company Limited
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