Olefin polymer and preparation method thereof

Patent metadata

Field	Value
Publication number	US-10766985-B2
Application number	US-201715760986-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Feb 24, 2016
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

The present invention relates to an olefin polymer and a preparation method thereof. The olefin polymer exhibits excellent mechanical strength and high processability, and thus is expected to be utilized as a material for various products. Particularly, the olefin polymer can be stably produced into films by a melt-blowing process and thus is expected to be usefully used as a material for products prepared by a melt-blowing process.

First claim

The invention claimed is:

1. An olefin polymer,
wherein the olefin polymer has SF of 65 or more which is calculated by the following Equation 1:
SF=Mw/10 4 +5/(Mw/10 5 )*exp(ratio of increase in elongational viscosity)  [Equation 1]

in the above equation 1, Mw means a weight average molecular weight,
the ratio of increase in elongational viscosity is a value in which the highest elongational viscosity value measured for the olefin polymer at Hencky strain rate of 1 s −1 at 170° C. using an elongational viscosity fixture attached to the ARES rheometer is divided by the elongational viscosity value of the extrapolated straight line at the time when the highest elongational viscosity value is obtained, wherein the extrapolated straight line is a straight line in which a straight line having the average slope of the section where the elongational viscosity increases steadily with time is extended to a section where the elongational viscosity increases sharply while maintaining the above average slope,
wherein a ratio of increase in elongational viscosity is 2.5 or more and 5.0 or less,
wherein a weight average molecular weight of the olefin polymer is 100,000 to 160,000 g/mol, and
wherein the olefin polymer is prepared by a method comprising: a step of polymerizing an olefin monomer in the presence of a hybrid supported catalyst comprising a carrier, a crosslinking type transition metal compound represented by the following Chemical Formula 1 that is supported on the carrier, and a non-crosslinking type transition metal compound represented by the following Chemical Formula 2 that is supported on the carrier:

wherein in the above Chemical Formulae 1 and 2, M 1 and M 2 are the same as or different from each other, and each independently represent Ti, Zr or Hf,
X 1 , X 2 , X 3 and X 4 are the same as or different from each other, and each independently represent any one of halogen, a nitro group, an amido group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a sulfonate group having 1 to 20 carbon atoms, and a sulfone group having 1 to 20 carbon atoms,
T is C, Si, Ge, Sn or Pb,
Q 1 and Q 2 are the same as or different from each other, and each independently represent any one of hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms, a heterocycloalkyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a carboxylate having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and a heteroaryl group having 5 to 20 carbon atoms,
R 1 to R 6 are the same as or different from each other, and each independently represent any one of hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, a silylalkyl group having 1 to 20 carbon atoms, a silyloxyalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms,
R 7 to R 14 are the same as or different from each other, and each independently represent any one of hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, a silylalkyl group having 1 to 20 carbon atoms, a silyloxyalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms, or one or more pairs of adjacent substituents of R 7 to R 14 are connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring, and
R 15 to R 24 are the same as or different from each other, and each independently represent any one of hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, a silylalkyl group having 1 to 20 carbon atoms, a silyloxyalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms, or one or more pairs of adjacent substituents of R 15 to R 24 are connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring.

2. The olefin polymer of claim 1 , wherein a density of the olefin polymer is 0.910 g/cm 3 to 0.940 g/cm 3 .

3. The olefin polymer of claim 1 , wherein a number average molecular weight of the olefin polymer is 20,000 to 50,000 g/mol.

4. The olefin polymer of claim 1 , wherein a melt index of the olefin polymer is 0.5 g/10 min or more and less than 3 g/10 min, which is measured at a temperature of 190° C. under a load of 2.16 kg according to standard ASTM D1238.

5. The olefin polymer of claim 1 , wherein MFRR (21.6/2.16) of the olefin polymer is 20 or more and less than 40 in which a melt flow rate (MFR 21.6 ) measured at a temperature of 230° C. under a load of 21.6 kg according to ISO 1133 is divided by a melt flow rate (MFR 2.16 ) measured at a temperature of 230° C. under a load of 2.16 kg according to ISO 1133.

6. The olefin polymer of claim 1 , wherein the olefin polymer is a copolymer of ethylene and alpha olefin.

7. The olefin polymer of claim 6 , wherein the alpha olefin includes 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 mixtures thereof.

8. A method for preparing the olefin polymer according to claim 1 , which comprises a step of polymerizing an olefin monomer in the presence of a hybrid supported catalyst comprising a carrier, a crosslinking type transition metal compound represented by the following Chemical Formula 1 that is supported on the carrier, and a non-crosslinking type transition metal compound represented by the following Chemical Formula 2 that is supported on the carrier:

in the above formulae 1 and 2, M 1 and M 2 are the same as or different from each other, and each independently represent Ti, Zr or Hf,
X 1 , X 2 , X 3 and X 4 are the same as or different from each other, and each independently represent any one of halogen, a nitro group, an amido group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a sulfonate group having 1 to 20 carbon atoms, and a sulfone group having 1 to 20 carbon atoms,
T is C, Si, Ge, Sn or Pb,
Q 1 and Q 2 are the same as or different from each other, and each independently represent any one of hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms, a heterocycloalkyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a carboxylate having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and a heteroaryl group having 5 to 20 carbon atoms,
R 1 to R 6 are the same as or different from each oth

Assignees

• Lg Chemical Ltd

Inventors

• Cho Sol
• Park Sung Hyun
• Kwon Oh Joo
• Lee Ki Soo
• Kwon Heon Yong
• Hong Dae Sik
• Lee Myung Han
• Kwon Hyun Jee

Classifications

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F4/65916

  supported on a carrier, e.g. silica, MgCl2, polymer · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08F4/65925

  two cyclopentadienyl rings being mutually non-bridged · CPC title

• C08F210/02 Primary

  Ethene · CPC title