Polyolefin sheets for thermoforming
AssigneeBasell Poliolefine Italia S.r.l.
InventorsAnteo Pelliconi, Angelo Lonardo, Gabriele Mei
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Abstract
Polypropylene sheet for thermoforming having 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 the group consisting of ethylene and C4-C10 α-olefins, and having I) a melting temperature of 155° C. or higher; and II) a xylene soluble fraction at room temperature lower than 4% by weight, and a value of the ratio of the polymer fraction collected at 25° C. to 95° C. to the xylene soluble fraction higher than 8.
Claims5
A polyolefin sheet for thermoforming 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 the group consisting of ethylene and C4-C10 α-olefins, said polymer or polymer composition having the following features:
- I) a melting temperature of 155° C. or higher;
- and
- II) a xylene soluble fraction at room temperature (about 25° C.) lower than 4% by weight, and a value of the ratio of the polymer fraction collected by TREF at a temperature from 25° C. to 95° C. to the xylene soluble fraction at room temperature higher than 8 wt %/wt %.
Dependencies are inferred from the claim text.