Polyethylene films having a good balance of optical and mechanical properties are disclosed. The films are derived from ethylene copolymer compositions made with a suitably substituted phosphinimine catalyst. The ethylene copolymers have very narrow molecular weight distributions and broadened comon
Polyethylene films having a good balance of optical and mechanical properties are disclosed. The films are derived from ethylene copolymer compositions made with a suitably substituted phosphinimine catalyst. The ethylene copolymers have very narrow molecular weight distributions and broadened comonomer distributions.
대표청구항▼
1. A film comprising a copolymer of ethylene and 1-hexene wherein the film has a haze of ≦12%, a dart impact of ≧500 g/mil, an MD tear of ≧200 g/mil and wherein the copolymer has a density of from 0.916 g/cc to 0.930 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)250 g/
1. A film comprising a copolymer of ethylene and 1-hexene wherein the film has a haze of ≦12%, a dart impact of ≧500 g/mil, an MD tear of ≧200 g/mil and wherein the copolymer has a density of from 0.916 g/cc to 0.930 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)250 g/mil and a TD tear >380 g/mil. 9. The film of claim 1 wherein the film has a ratio of MD tear to TD tear (MD tear/TD tear) of from 0.50 to 0.85. 10. The film of claim 1 wherein the film has an MD secant modulus at 1% strain ≧130 Mpa and a TD secant modulus at 1% strain ≧135 Mpa. 11. The film of claim 1 wherein the film has a dart impact of ≧600 g/mil. 12. The film of claim 1 wherein the copolymer has a molecular weight distribution (Mw/Mn) of ≦2.1. 13. The film of claim 1 wherein the copolymer is made in a single gas phase reactor with a single polymerization catalyst comprising: an organometallic compound having a phosphinimine ligand; an alkylaluminoxane cocatalyst; and an inert support. 14. The film of claim 13 wherein the organometallic compound has the formula: (1,2-(R2)(Ar—F)Cp)Ti(N═P(t-Bu)3)X2, where R2 is an alkyl group, Ar—F is a perfluorinated aryl group, a 2,6 fluoro substituted phenyl group, a 2,4,6 fluoro substituted phenyl group or a 2,3,5,6 fluoro substituted phenyl group and X is an activatable ligand. 15. The film of claim 14 wherein the organometallic compound has the formula: (1,2-(R2)(C6F5)Cp)Ti(N═P(t-Bu)3)X2, where R2 is n-propyl, n-butyl or n-hexyl; and where X is an activatable ligand. 16. A film exhibiting a haze of ≦12%, a dart impact of ≧500 g/mil, an MD tear of ≧200 g/mil wherein said film comprises a copolymer of ethylene and 1-hexene and which has a density of from 0.916 g/cc to 0.930 g/cc, an I21/I2T1 and the temperature difference between T1 and T2 is less than 20° C. 17. The film of claim 16 wherein the temperature difference between T1 and T2 is less than 15° C. 18. The film of claim 16 wherein from 12 to 25 wt % of the copolymer is represented at a temperature from 90° C. to 105 C.°. 19. The film of claim 16 wherein T2 is greater than 90° C. 20. The film of claim 16 wherein T1 is in the range of from 75 to 90° C. and T2 is in the range of 85 to 100° C. 21. The film of claim 16 wherein T1 is in the range of from 80 to 90° C. and T2 is in the range of 90 to 100° C. 22. The film of claim 16 wherein the copolymer has a CDBI of from 50% to 65%. 23. The film of claim 16 wherein the copolymer has a density of from 0.917 g/cc to 0.920 g/cc. 24. The film of claim 16 wherein the copolymer has a molecular weight distribution (Mw/Mn) of ≦2.3. 25. The film of claim 16 wherein the film has a MD tear >250 g/mil and a TD tear >380 g/mil. 26. The film of claim 16 wherein the film has a ratio of MD tear to TD tear (MD tear/TD tear) of from 0.50 to 0.85. 27. The film of claim 16 wherein the film has a dart impact of ≧600 g/mil. 28. The film of claim 16 wherein the film has an MD secant modulus at 1% strain ≧130 Mpa and a TD secant modulus at 1% strain ≧135 Mpa. 29. The film of claim 16 wherein the copolymer is made in a single gas phase reactor with a single polymerization catalyst comprising: an organometallic compound having a phosphinimine ligand; an alkylaluminoxane cocatalyst; and an inert support. 30. The film of claim 29 wherein the organometallic compound has the formula: (1,2-(R2)(Ar—F)Cp)Ti(N═P(t-Bu)3)X2, where R2 is an alkyl group, Ar—F is a perfluorinated aryl group, a 2,6 fluoro substituted phenyl group, a 2,4,6 fluoro substituted phenyl group, or a 2,3,5,6 fluoro substituted phenyl group, and X is an activatable ligand. 31. The film of claim 30 wherein the organometallic compound has the formula: (1,2-(R2)(C6F5)Cp)Ti(N═P(t-Bu)3)X2, where R2 is n-propyl, n-butyl or n-hexyl; and where X is an activatable ligand. 32. A film comprising a copolymer of ethylene and 1-hexene wherein the film has a haze of ≦12%, a dart impact of ≧500 g/mil, an MD tear of ≧200 g/mil and wherein the copolymer has a density of from 0.916 g/cc to 0.930 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)250 g/mil and a TD tear >380 g/mil. 39. The film of claim 32 wherein the film has a ratio of MD tear to TD tear (MD tear/TD tear) of from 0.50 to 0.85. 40. The film of claim 32 wherein the film has an MD secant modulus at 1% strain ≧130 Mpa and a TD secant modulus at 1% strain ≧135 Mpa. 41. The film of claim 32 wherein the film has a dart impact of ≧600 g/mil. 42. The film of claim 32 wherein the copolymer has a molecular weight distribution (Mw/Mn) of ≦2.1. 43. The film of claim 32 wherein the copolymer is made in a single gas phase reactor with a single polymerization catalyst comprising: an organometallic compound having a phosphinimine ligand; an alkylaluminoxane cocatalyst; and an inert support. 44. The film of claim 43 wherein the organometallic compound has the formula: (1,2-(R2)(Ar—F)Cp)Ti(N═P(t-Bu)3)X2, where R2 is an alkyl group, Ar—F is a perfluorinated aryl group, a 2,6 fluoro substituted phenyl group, a 2,4,6 fluoro substituted phenyl group, or a 2,3,5,6 fluoro substituted phenyl group and X is an activatable ligand. 45. The film of claim 44 wherein the organometallic compound has the formula: (1,2-(R2)(C6F5)Cp)Ti(N═P(t-Bu)3)X2, where R2 is n-propyl, n-butyl or n-hexyl; and where X is an activatable ligand. 46. A film comprising a copolymer of ethylene and an alpha-olefin having from 3-10 carbon atoms wherein the film has a haze of ≦12%, a dart impact of ≧500 g/mil, an MD tear of ≧200 g/mil and wherein the copolymer is selected from a group consisting of copolymer (a), copolymer (b), and copolymer (c); wherein copolymer (a) has a density of from 0.917 g/cc to 0.920 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)T1 and the temperature difference between T1 and T2 is less than 20° C.;and copolymer (c) has a density of from 0.917 g/cc to 0.920 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)250 g/mil, a TD tear >380 g/mil, and wherein the copolymer is selected from a group consisting of copolymer (a), copolymer (b), and copolymer (c); wherein copolymer (a) has a density of from 0.916 g/cc to 0.930 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)T1 and the temperature difference between T1 and T2 is less than 20° C.;and copolymer (c) has a density of from 0.916 g/cc to 0.930 g/cc, a melt index (I2) of from 0.3 to 3 g/10 min, a melt flow ratio (I21/I2)<20, a molecular weight distribution (Mw/Mn)≦2.5, and satisfies the condition: Tm≦(112.7+0.4×β) where Tm is the peak melting temperature in ° C. as determined by DSC, and β is the amount in wt % of the copolymer that elutes at 90° C. and above as determined by TREF.
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