Highly stereoregular polypropylene with improved properties
Propylene polymers having a content of isotactic pentads (mmmm) higher than 97%, molecular weight distribution, expressed by the formula (a) ratio, equal to or higher than 6 and a value of formula (b) ratio equal to or lower than 5.5. The said polymers are prepared in the presence of a particular combination of Ziegler-Natta solid catalyst components and highly stereoregulating electron-donor compounds. Laminated articles, in particular bi-axially oriented films and sheets, can be prepared with the said polymers. M _ w / M _ n ( a ) M _ z / M _ w ( b )
1. A film or sheet comprising a propylene polymer comprising:
1) a content of isotactic pentads (mmmm), measured by NMR, higher than 97%;
2) a molecular weight distribution, expressed by M w / M n ratio, rangers from higher than 8 to 11; and
3) a value of M z / M w ratio equal to or lower than 5.5; and
4) a polydispersity index equal to or less than 5, wherein the polydispersity index is equal to 54×(modulus separation) −1.76 , the modulus separation is equal to a frequency at G′=500 Pa/frequency at G″=500 Pa, and G′ is a storage modulus and G″ is a loss modulus.
2. The film or sheet of claim 1 , wherein the propylene polmer further comprises a hard resin selected from coke oven gas, cracked naphtha, gas oil, terpene oil, or terpene resin.
3. The film or sheet of claim 1 , wherein the propylene polymer further comprises a MFR value from 0.1 to 50 g/10 min.
4. The film or sheet of claim 3 , wherein said MFR value is from 1 to 30 g/10 min.
5. The film or sheet of claim 1 , wherein said film or sheet is biaxially oriented.
6. The film or sheet of claim 1 , wherein the molecular weight distribution ranges from equal to or higher than 8.7 to 11.
7. The film or sheet of claim 1 , wherein the film or sheet is a biaxially oriented film or sheet.
8. A film or sheet comprising a proylene polymer comprising:
1) a content of isotactic pentads (mmmm), measured by NMR, higher than 97%;
2) a molecular weight distribution, expressed by M w / M n ratio, is equal to or higher than 8.7;
3) a value of M z / M w ratio equal to or lower than 5.5; and
4) a polydispersity index equal to or less than 5, wherein the polydispersity index is equal 54×(modulus separation) −1.76 , the modulus separation is equal to a frequency at G′=500 Pa/frequency at G″=500 Pa, and G′ is a storage modulus and G″ is a loss modulus.
9. A multilayer laminated article comprising a film or sheet comprising a propylene polymer comprising:
1) a content of isotactic pentads (mmmm), measured by NMR, higher than 97%;
2) a molecular weight distribution, expressed by M w / M n ratio, ranges from higher than 8 to 11; and;
3) a value of M z / M w ratio equal to or lower than 5.5; and
4) a polydispersity index equal to or less than 5, wherein the polydispersity index is equal to 54×(modulus separation) −1.76 , the modulus separation is equal to a frequency at G′=500 Pa/frequency at G″=500 Pa, and G′ is a storage modulus and G″ is a loss modulus.
10. The multilayer laminated article of claim 9 , wherein the propylene polymer further comprises a hard resin selected from coke oven gas, cracked naphtha, gas oil, terpene oil, or terpene resin.
11. The multilayer laminated article of claim 9 , wherein the propylene polymer further comprises a MFR value from 0.1 to 50 g/10 min.
12. The multilayer laminated article of claim 11 , wherein said MFR value is from 1 to 30 g/10 min.
13. The multilayer laminated article of claim 9 , wherein said film or sheet is biaxially oriented.
14. The multilayer laminated article of claim 9 , wherein the molecular weight distribution ranges from equal to or higher than 8.7 to 11.
15. The multilayer laminated article of claim 9 , wherein the film or sheet is a biaxially oriented film or sheet.
16. A multilayer laminated article comprising a film or sheet comprising a propylene polymer comprising:
1) a content of isotactic pentads (mmmm), measured by NMR, higher than 97%;
2) a molecular weight distribution, expressed by M w / M n ,ratio, is equal to or higher than 8.7;
3) a value of M z / M w ratio equal to or lower than 5.5; and
4) a polydispersity index equal to or less than 5, wherein the polydispersity index is equal to 54×(modulus separation) −1.76 , the modulus separation is equal to a frequency at G′=500 Pa/frequency at G″=500 Pa, and G′ is a storage modulus and G″ is a loss modulus.