A polymer blend comprising first and second polyethylene copolymers is presented which has good processability, and which when made into film shows good toughness-stiffness balance, reasonable MD tear, as well as good optical properties.
대표청구항▼
1. A polymer blend comprising: a) from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 2.0 g/10 min, a melt flow ratio (I21/I2) of from about 32 to about 50, a molecular weight distribu
1. A polymer blend comprising: a) from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 2.0 g/10 min, a melt flow ratio (I21/I2) of from about 32 to about 50, a molecular weight distribution (Mw/Mn) of from about 3.6 to about 6.5, a reverse comonomer distribution profile as determined by GPC-FTIR, a multimodal TREF profile, a composition distribution breadth index CDBI50 of from 50 wt % to 75 wt % as determined by TREF and which further satisfies the relationship: (Mw/Mn)≧72 [(I21/I2)−1+10−6(Mn)];andb) from about 95 to about 5 wt % of a second polyethylene copolymer which is a linear low density polyethylene (LLDPE) different from the first polyethylene copolymer and having a density of from about 0.910 to about 0.940 g/cm3, a melt index (I2) of from about 0.2 to about 5.0 g/10 min, and a melt flow ratio (I21/I2) of less than about 35. 2. The polymer blend of claim 1, wherein the first polyethylene copolymer has a δXO of from about 55° to about 70°; wherein δXO is the phase angle at which the complex modulus (G*) and the complex viscosity (η*) are numerically equivalent in a plot of phase angle vs complex modulus and complex viscosity as determined by dynamic mechanical analysis. 3. The polymer blend of claim 1, wherein the first polyethylene copolymer satisfies the relationship: δXO≦80.7−(CDBI50)/(Mw/Mn) at a δXO of from about 55° to about 70°; wherein δXO is the phase angle at which the complex modulus (G*) and the complex viscosity (η*) are numerically equivalent in a plot of phase angle vs complex modulus and complex viscosity as determined by dynamic mechanical analysis. 4. The polymer blend of claim 1, wherein the first polyethylene copolymer satisfies the relationship: δXO≦83.0−1.25(CDBI50)/(Mw/Mn); wherein δXO is the phase angle at which the complex modulus (G*) and the complex viscosity (η*) are numerically equivalent in a plot of phase angle vs complex modulus and complex viscosity as determined by dynamic mechanical analysis. 5. The polymer blend of claim 1, wherein the first polyethylene copolymer has a multimodal TREF profile comprising two intensity maxima at elution temperatures T(low) and T(high); wherein T(low) is from about 65° C. to about 85° C., and T(high) is from about 90° C. to about 98° C. 6. The polymer blend of claim 1, wherein the blend comprises from about 5 to about 50 wt % of the first polyethylene copolymer and from about 95 to about 50 wt % of the second polyethylene copolymer. 7. The polymer blend of claim 1, wherein the first polyethylene copolymer has a molecular weight distribution (Mw/Mn) of from about 4.0 to about 6.0. 8. The polymer blend of claim 1, wherein the first polyethylene copolymer has a melt index (I2) of from about 0.25 to about 0.80 g/10 min. 9. The polymer blend of claim 1, wherein the first polyethylene copolymer has a density of from about 0.917 to about 0.927 g/cm3. 10. The polymer blend of claim 1, wherein the first polyethylene copolymer has a Z-average molecular weight distribution (Mz/Mw) of from about 2.0 to about 4.0. 11. The polymer blend of claim 1, wherein the first polyethylene copolymer has an amount eluting at a temperature of from about 90° C. to about 105° C. of from about 5 to about 30 weight percent as determined by TREF. 12. The polymer blend of claim 1, wherein the first polyethylene copolymer has an amount eluting at a temperature of above about 100° C. of about 0 weight percent as determined by TREF. 13. The polymer blend of claim 1, wherein the second polyethylene copolymer has a density of from about 0.916 to about 0.930 g/cm3. 14. The polymer blend of claim 1, wherein the second polyethylene copolymer has a CDBI50 of at least about 50 wt %. 15. The polymer blend of claim 1, wherein the second polyethylene copolymer has a molecular weight distribution (Mw/Mn) of from about 1.7 to about 5.0. 16. A film structure comprising a least one layer comprising the polymer blend of claim 1. 17. A blown film comprising the polymer blend of claim 1, the film having a haze of less than about 10% and a gloss at about 45° of greater than about 55. 18. A cast film comprising the polymer blend of claim 1, the film having a haze of less than about 10% and a gloss at about 45° of greater than about 55. 19. A polymer blend comprising: a) from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 1.0 g/10 min, a melt flow ratio (I21/I2) of from about 32 to about 50, a molecular weight distribution (Mw/Mn) of from about 3.6 to about 6.5, a reverse comonomer distribution profile as determined by GPC-FTIR, a multimodal TREF profile, a composition distribution breadth index CDBI50 of from 50 wt % to 75 wt % as determined by TREF and which further satisfies the relationship: (Mw/Mn)≧72[(I21/I2)−1+10−6 (Mn)];andb) from about 95 to about 5 wt % of a second polyethylene copolymer which is a linear low density polyethylene (LLDPE) having a density of from about 0.910 to about 0.940 g/cm3, a melt index (I2) of from about 0.2 to about 5.0 g/10 min, and a melt flow ratio (I21/I2) of less than about 32. 20. The polymer blend of claim 19, wherein the first polyethylene copolymer has a δXO of from about 55° to about 70°; wherein δXO is the phase angle at which the complex modulus (G*) and the complex viscosity (η*) are numerically equivalent in a plot of phase angle vs complex modulus and complex viscosity as determined by dynamic mechanical analysis. 21. A film structure comprising a least one layer comprising the polymer blend of claim 19. 22. A blown film comprising the polymer blend of claim 19, the film having a haze of less than about 10% and a gloss at about 45° of greater than about 55. 23. A cast film comprising the polymer blend of claim 19, the film having a haze of less than about 10% and a gloss at about 45° of greater than about 55. 24. A polymer blend comprising: a) from about 5 to about 95 wt % of a first polyethylene copolymer having a density of from about 0.916 to about 0.936 g/cm3, a melt index (I2) of from about 0.1 to about 1.0 g/10 min, a melt flow ratio (I21/I2) of at least about 30, a molecular weight distribution (Mw/Mn) of from about 3.6 to about 6.5, a reverse comonomer distribution profile as determined by GPC-FTIR, a multimodal TREF profile, a composition distribution breadth index CDBI50 of from 50 wt % to 75 wt % as determined by TREF and which further satisfies the relationship: (Mw/Mn)≧72 [(I21/I2)−1+10−6 (Mn)];andb) from about 95 to about 5 wt % of a second polyethylene copolymer which is a linear low density polyethylene (LLDPE) having a density of from about 0.910 to about 0.940 g/cm3, a melt index (I2) of from about 0.2 to about 5.0 g/10 min, and a melt flow ratio (I21/I2) of less than about 35. 25. The polymer blend of claim 24, wherein the first polyethylene copolymer has a δXO of from about 55° to about 70°; wherein δXO is the phase angle at which the complex modulus (G*) and the complex viscosity (η*) are numerically equivalent in a plot of phase angle vs complex modulus and complex viscosity as determined by dynamic mechanical analysis. 26. A film structure comprising a least one layer comprising the polymer blend of claim 24. 27. A blown film comprising the polymer blend of claim 24, the film having a haze of less than about 10% and a gloss of greater than about 55. 28. A cast film comprising the polymer blend of claim 24, the film having a haze of less than about 10% and a gloss at about 45° of greater than about 55.
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