Bioriented polypropylene films
AssigneeBasell Poliolefine Italia S.r.l.
InventorsAnteo Pelliconi, Angelo Lonardo, Gabriele Mei
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Abstract
Bioriented polypropylene films (BOPP) wherein at least one layer comprises a propylene polymer containing at least 0.8 % by weight of ethylene and optionally one or more (C4-C10α-olefins, or a propylene polymer composition containing at least 0.8% by weight of one or more comonomers selected from ethylene and more C4-C10α-olefins, and having the following Icatures: 1) a melting temperature of 155° C. or higher; 2) a content of fraction soluble in xylene at room temperature lower than 3% by weight and a value of the ratio of the polymer fraction collected at the temperature range from 25° C. to 95° C. (by TREF) to the said xylene soluble fraction higher than 8.
Claims7
Bioriented polypropylene film (BOPP) wherein at least one layer comprises a propylene polymer containing at least 0.8% by weight of ethylene and optionally one or more C4-C10 α-olefins, or a propylene polymer composition containing at least 0.8% by weight of one or more comonomers selected from ethylene and C4-C10 α-olefins, said polymer or polymer composition having the following features:
- 1) a melting temperature of 155° C. or higher;
- 2) a content of fraction soluble in xylene at room temperature (about 25° C.) lower than 3% by weight, and a value of the ratio of the polymer fraction collected in the temperature range from 25° C. to 95° C. to the fraction soluble in xylene at room temperature higher than 8 wt %/wt %.
A propylene polymer composition comprising a first propylene (co)polymer (where the copolymer is a random copolymer) with an ethylene content between 0 and 1.5% by weight, and a second propylene random copolymer with an ethylene content between 0.8 and 5% by weight, the weight ratio of the second copolymer to the first (co)polymer being in the range from about 20:80 to about 80:20, and the difference in the ethylene content between the two being preferably from 1 to 4 percentage units with respect to the weight of the (co)polymer concerned, said composition having the following features:
- 1) a melting temperature of 155° C. or higher;
- 2) a content of fraction soluble in xylene at room temperature (about 25° C.) lower than 3% by weight, and a value of the ratio of the polymer fraction collected in the temperature range from 25° C. to 95° C. to the fraction soluble in xylene at room temperature higher than 8 wt %/wt %.
A propylene polymer composition comprising a first propylene (co)polymer (where the copolymer is a random copolymer) with a comonomer content between 0 and 2% by weight, and a second propylene random copolymer with a comonomer content between 1.5 and 12% by weight, the weight ratio of the second copolymer to the first (co)polymer being in the range from about 20:80 to about 80:20, and the difference in the comonomer content between the two being preferably from 1.5 to 10 percentage units with respect to the weight of the (co)polymer concerned, wherein the said comonomer is selected from C4-C10 α-olefins and mixtures thereof, with ethylene optionally being present, said composition having the following features:
- 1) a melting temperature of 155° C. or higher;
- 2) a content of fraction soluble in xylene at room temperature (about 25° C.) lower than 3% by weight, and a value of the ratio of the polymer fraction collected in the temperature range from 25° C. to 95° C. to the fraction soluble in xylene at room temperature higher than 8 wt %/wt %.
Dependencies are inferred from the claim text.