Olefin Polymer And Preparation Method Thereof

Abstract

The present disclosure provides an olefin polymer having excellent film processability and physical properties, and a preparation method of the same.

1 . An olefin polymer satisfying the following conditions (a) to (f):
 (a) a density: 0.910 g/cm 3  to 0.930 g/cm 3      (b) a melt index (measured according to ASTM D1238 at a temperature of 190° C. under a load of 2.16 kg): 0.5 g/10 min to 1.5 g/10 min   (c) a content of a branched polymer structure: 1 to 7 wt % based on the total weight of the olefin polymer   (d) a weight average molecular weight of main chain in the branched polymer structure: 100,000 to 600,000 g/mol   (e) the number of long chain branch in the branched polymer structure: 0.005 to 0.010 per 1000 carbon atoms in the olefin polymer   (f) a weight average molecular weight of the long chain branch in the branched polymer structure: 15,000 to 45,000 g/mol.   
     
     
         2 . The olefin polymer of  claim 1 , wherein the olefin polymer has a melt strength measured at 190° C. of 70 mN or more. 
     
     
         3 . The olefin polymer of  claim 1 , wherein MFRR(21.6/2.16), a value that the melt flow rate (MFR 21.6 ) measured at a temperature of 190° C. under a load of 21.6 kg according to ISO 1133 is divided by the melt flow rate (MFR 2.16 ) measured at a temperature of 190° C. under a load of 2.16 kg according to ISO 1133, is 20 or more and less than 40. 
     
     
         4 . The olefin polymer of  claim 1 , wherein the olefin polymer has a weight average molecular weight of 90,000 g/mol to 600,000 g/mol. 
     
     
         5 . The olefin polymer of  claim 1 , wherein the olefin polymer has a polydispersity index of 1 to 3. 
     
     
         6 . The olefin polymer of  claim 1 , wherein the olefin polymer is a copolymer of ethylene and an alpha-olefin. 
     
     
         7 . The olefin polymer of  claim 6 , wherein the alpha-olefin is selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, and a mixture thereof. 
     
     
         8 . A preparation method of the olefin polymer according to  claim 1 , comprising the step of polymerizing olefinic monomers in the presence of a supported catalyst,
 wherein the supported catalyst comprises a support, and a first transition metal compound represented by the following Chemical Formula 1 and a second transition metal compound represented by the following Chemical Formula 2 which are supported on the support in a weight ratio of 1:0.1 to 1:1:   
       
         
           
           
               
               
           
         
         in Chemical Formula 1, 
         M is Ti, Zr or Hf, 
         X 1  and X 2  are the same as or different from each other, and are each independently selected from the group consisting of halogen, a nitro group, an amido group, a phosphine group, a phosphide group, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C2 to C20 alkenyl group, a C6 to C20 aryl group, a C1 to C20 sulfonate group, and a C1 to C20 sulfone group, 
         T is C, Si, Ge, Sn or Pb, 
         Q 1  and Q 2  are the same as or different from each other, and are each independently selected from the group consisting of hydrogen, halogen, a C1 to C20 alkyl group, a C2 to C20 heterocycloalkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a C1 to C20 carboxylate, and a C2 to C20 alkenyl group, 
         R is selected from the group consisting of a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, and a C6 to C20 aryl group, and 
         R 1  to R 9  are the same as or different from each other, and are each independently selected from the group consisting of hydrogen, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, and a C6 to C20 aryl group, 
       
       
         
           
           
               
               
           
         
         in Chemical Formula 2, 
         M′ is Ti, Zr or Hf, 
         X 3  and X 4  are the same as or different from each other, and are each independently selected from the group consisting of halogen, a nitro group, an amido group, a phosphine group, a phosphide group, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C2 to C20 alkenyl group, a C6 to C20 aryl group, a C1 to C20 sulfonate group, and a C1 to C20 sulfone group, and 
         R 11  to R 20  are the same as or different from each other, and are each independently selected from the group consisting of hydrogen, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, and a C6 to C20 aryl group, or one or more pairs of neighboring substituents of R 11  to R 20  may be connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring. 
       
     
     
         9 . The preparation method of  claim 8 , wherein in the Chemical Formula 1 of the first transition metal compound, R is selected from the group consisting of a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, and a C6 to C20 aryl group,
 R 1  to R 4  are the same as or different from each other, and are each independently hydrogen, or a C1 to C20 alkyl group, and   R 5  to R 9  are hydrogen.   
     
     
         10 . The preparation method of  claim 8 , wherein in the first transition metal compound, R is a C1 to C10 alkyl group, R 1  to R 4  are the same as or different from each other, and are each independently hydrogen, or a C1 to C10 alkyl group, and R 5  to R 9  are hydrogen. 
     
     
         11 . The preparation method of  claim 8 , wherein the second transition metal compound is a compound represented by the following Chemical Formula 2a: 
       
         
           
           
               
               
           
         
         in Chemical Formula 2a, 
         R 21  to R 24  are the same as or different from each other, and are each independently selected from the group consisting of hydrogen, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, and a C6 to C20 aryl group. 
       
     
     
         12 . The preparation method of  claim 8 , wherein the support comprises one or more selected from the group consisting of silica, alumina, and magnesia. 
     
     
         13 . The preparation method of  claim 8 , wherein the olefinic monomers are ethylene and alpha-olefin. 
     
     
         14 . The preparation method of  claim 8 , wherein the first transition metal compound is a compound represented by the following Chemical Formula 1a: 
       
         
           
           
               
               
           
         
         in Chemical Formula 1a, 
         Q 1  and Q 2  are the same as or different from each other, and are each independently selected from the group consisting of a C1 to C10 alkyl group, a C1 to C10 alkoxy group, and a C2 to C10 alkoxyalkyl group, 
         R is selected from the group consisting of a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, and a C6 to C20 aryl group, 
         R 1  to R 4  are the same as or different from each other, and are each independently hydrogen or a C1 to C10 alkyl group, and 
         R 5  to R 9  are hydrogen. 
       
     
     
         15 . The preparation method of  claim 14 , wherein the first transition metal compound is a compound represented by the following Chemical Formula 1a-1: 
       
         
           
           
               
               
           
         
       
     
     
         16 . The preparation method of  claim 11 , wherein the second transition metal compound is a compound represented by the following Chemical Formula 2a-1: 
       
         
           
           
               
               
           
         
       
     
     
         17 . The preparation method of  claim 8 , wherein the second transition metal compound is a compound represented by the following Chemical Formula 2b: 
       
         
           
           
               
               
           
         
         in Chemical Formulae 2b, 
         R 25  to R 28  are the same as or different from each other, and are each independently selected from the group consisting of halogen, a C1 to C20 alkyl group, a C1 to C20 alkoxy group, a C2 to C20 alkoxyalkyl group, a silyl group, a C1 to C20 alkylsilyl group, a C1 to C20 silylalkyl group, a C1 to C20 alkoxysilyl group, a C1 to C20 silyloxyalkyl group, a C2 to C20 alkenyl group, a C6 to C20 aryl group, a C7 to C20 alkylaryl group, and a C7 to C20 arylalkyl group. 
       
     
     
         18 . The preparation method of  claim 8 , wherein a weight ratio of the total amount of the first transition metal compound and the second transition metal compound to the support is 1:10 to 1:1,000. 
     
     
         19 . The preparation method of  claim 8 , wherein the supported catalyst further comprises a cocatalyst selected from the group consisting of the compounds represented by the following Chemical Formulae 3 to 5, and a mixture thereof:
   R 31 —[Al(R 32 )—O] n —R 33   [Chemical Formula 3]
   in Chemical Formula 3,   R 31 , R 32  and R 33  are each independently selected from the group consisting of hydrogen,   halogen, a C1 to C20 hydrocarbyl group, and a halogen-substituted C1 to C20 hydrocarbyl group, and   n is an integer of 2 or more,
   D(R 34 ) 3   [Chemical Formula 4]
 
   in Chemical Formula 4,   D is aluminum or boron, and   R 34  are each independently selected from the group consisting of halogen, a C1 to C20 hydrocarbyl group, and a halogen-substituted C1 to C20 hydrocarbyl group,
   [L-H] + [Z(A) 4 ] −  or [L] + [Z(A) 4 ] −   [Chemical Formula 5]
 
   in Chemical Formula 5,   L is a neutral or cationic Lewis base,   H is a hydrogen atom,   Z is a Group 13 element, and   A are each independently selected from the group consisting of a C1 to C20 hydrocarbyl group; a C1 to C20 hydrocarbyloxy group; and substituents in which at least one hydrogen atom of these substituents is substituted with at least one substituent selected from the group consisting of halogen, a C1 to C20 hydrocarbyloxy group and a C1 to C20 hydrocarbylsilyl group.   
     
     
         20 . The preparation method of  claim 19 , wherein the weight ratio of the cocatalyst to the support may be 1:1 to 1:100.