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US 6,440,577 B1Granted
Propylene polymers suitable for transparent cast film
AssigneeBasell Poliolefine Italia S.r.l.
InventorsEnrico Beccarini, Giorgio Paci, Franco Sartori
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Abstract
Cast laminates produced from highly crystalline propylene polymers having a MFR ranging from 5 to 15 g/10 min, a ratio between the weight average molecular weight and the number average molecular weight ranging from 4.5 to 9, a density equal to or greater than 0.9020 g/cm3, and solubility in xylene at ambient temperature not greater than 2.5% by weight.
Claims14
Crystalline propylene polymers having:
- (a) MFR ranging from 5 to 15 g/l10 min;
- (b) ratio between weight average molecular weight (Mw) and number average molecular weight (Mn), i.e., Mw/Mn, ranging from 4.5 to 9;
- (c) polydispersity index (PI), which is defined by the equation PI=105 /Gc, wherein the Gc (crossover modulus) value is the one where G′ (storage modulus) coincides with G″ (loss modulus) and ranges from 2 to 6;
- (d) density equal or greater than 0.9020 g/cm3;
- and
- (e) solubility in xylene at ambient temperature, i.e., at about 25° C., not greater than 2.5% by weight;
- said polymers being obtained by way of chemical visbreaking of a polymer having a polydispersity index ranging from 5 to 8.
4 more elements
Dependencies are inferred from the claim text.