Olefin-based Copolymer And Process For Preparing Same

Patent metadata

Field	Value
Publication number	US-2019135963-A1
Application number	US-201716307319-A
Country	US
Kind code	A1
Filing date	Sep 18, 2017
Priority date	Sep 23, 2016
Publication date	May 9, 2019
Grant date	—

Abstract

The present invention relates to an olefin-based copolymer having novel crystalline properties and capable of providing a molded article with further improved strength and impact strength when compounded with other resins, and a method for preparing the same. The olefin-based copolymer is an olefin-based copolymer comprising an ethylene repeating unit and an α-olefinic repeating unit. The olefin-based copolymer comprises polymer fractions defined by three different peaks at a predetermined temperature when analyzed by cross-fractionation chromatography.

First claim

1 . An olefin-based copolymer comprising an ethylene repeating unit and an α-olefin-based repeating unit,
wherein when the olefin-based copolymer is analyzed by cross-fractionation chromatography (CFC), it includes
a first fraction defined as a first peak appearing at a first elution temperature (Te1) of −20″C to 50° C.,
a second fraction defined as a second peak appearing at a second elution temperature (Te2) of 50° C. to 85° C., and
a third fraction defined as a third peak appearing at a third elution temperature (Te3) higher than that of the second elution temperature (Te2), for example, at a temperature of 85° C. to 130° C.,
and wherein the fraction ratio of the second fraction defined by the integral area of the second peak is 7 to 75%.

2 . The olefin-based copolymer according to claim 1 , wherein the central peak temperature of the second peak of the olefin-based copolymer is 50° C. to 85° C.

3 . The olefin-based copolymer according to claim 1 , wherein the central peak temperature of the first peak of the olefin-based copolymer is −15° C. to 15° C., and the fraction ratio of the first fraction defined by the integral area of the first peak is 50 to 75%.

4 . The olefin-based copolymer according to claim 1 , wherein the central peak temperature of the third peak is 85° C. to 100° C., and the fraction ratio of the third fraction defined by the integral area of the third peak is 5 to 75%.

5 . The olefin-based copolymer according to claim 1 , wherein the third fraction has a crystallinity higher than that of the second fraction, and the second fraction has a crystallinity higher than that of the first fraction.

6 . The olefin-based copolymer according to claim 1 , wherein it has a melting point of 100° C. to 140° C. as measured by DSC.

7 . The olefin-based copolymer according to claim 1 , wherein the second fraction of the olefin-based copolymer has the number of short chain branches (SCB) per 1,000 carbon atoms of more than 50.

8 . The olefin-based copolymer according to claim 1 , wherein it has a density of 0.85 g/cc to 0.91 g/cc.

9 . The olefin-based copolymer according to claim 1 , wherein it has a meat index of 0.5 to 3 g/10 min at 190° C. under a load of 2.16 kg.

10 . The olefin-based copolymer according to claim 1 , wherein it contains 50 to 90% by weight of an ethylene repeating unit and the remaining amount of an alpha-olefin-based repeating unit.

11 . The olefin-based copolymer according to claim 1 , wherein the α-olefin repeating unit is a repeating unit derived from at least one α-olefin selected from the group consisting of 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene and 1-hexadecene.

12 . An olefin-based copolymer containing an ethylene repeating unit and an α-olefin-based repeating unit,
wherein when the olefin-based copolymer is analyzed by cross-fractionation chromatography (CFC), it includes
a first fraction defined as a first peak appearing at a first elution temperature Te1 of −20° C., to 50° C.
a second fraction defined as a second peak appearing at a second elution temperature (Te2) of 50° C. to 85° C. and
a third fraction defined as a third peak appearing at a third elution temperature (Te3) higher than that of the second elution temperature (Te2), and
wherein the second fraction of the olefin-based copolymer has the number of short-chain branches (SCB) per 1,000 carbon atoms of more than 50.

13 . A method for preparing the olefin-based copolymer of claim 1 comprising copolymerizing ethylene and α-olefin in the presence of a catalyst composition comprising a first metallocene catalyst including a compound of the following Chemical Formula 1 and a second metallocene catalyst including a compound of the following Chemical Formula 2:

in Chemical Formula 1,
R1 and R2 are each independently hydrogen, an alkyl having 1 to 20 carbon atoms, an aryl having 6 to 20 carbon atoms, silyl, an alkenyl having 1 to 20 carbon atoms, an alkylaryl having 7 to 25 carbon atoms, an arylalkyl having 7 to 25 carbon atoms, or a metalloid radical of a Group 14 metal substituted with hydrocarbyl; and
the R1 and R2 are optionally connected to each other by an alkylidene radical containing an alkyl having 1 to 20 carbon atoms or an aryl having from 6 to 20 carbon atoms to form a ring;
each R3 is independently hydrogen, a halogen, an alkyl radical having 1 to 20 carbon atoms, an aryl radical having 6 to 20 carbon atoms, an alkoxy radical having 6 to 20 carbon atoms, an aryloxy radical, or an amido radical; and
two or more the R3 are optionally connected to each other to form an aliphatic or aromatic ring;
CY1 is a substituted or unsubstituted aliphatic or aromatic ring;
M is a Group 4 transition metal; and
Q 1 and Q 2 are each independently a halogen, an alkyl radical having 1 to 20 carbon atoms, an aryl amido radical having 6 to 20 carbon atoms, an alkyl radical having 1 to 20 carbon atoms, an alkenyl radical having 1 to 20 carbon atoms, an aryl radical having 6 to 20 carbon atoms, an alkylaryl radical having 7 to 25 carbon atoms, an arylalkyl radical having 7 to 25 carbon atoms, or an alkylidene radical having 1 to 20 carbon atoms,

in Chemical Formula 2,
R 4 and R 5 are each independently selected from the group consisting of an alkyl group having 1 to 20 carbon atoms which is substituted or unsubstituted with halogen, a cycloalkyl having 5 to 60 carbon atoms, an aryl having 6 to 60 carbon atoms, a cyclodiene group having 5 to 60 carbon atoms, an alkenyl having 2 to 20 carbon atoms, an alkylaryl having 7 to 60 carbon atoms and an arylalkyl having 7 to 60 carbon atoms;
Q 4 to Q 6 are each independently hydrogen or deuterium;
CY2 is an aliphatic ring having 5 to 20 carbon atoms which contains nitrogen and is substituted or unsubstituted with alkyl having 1 to 5 carbon atoms;
M is Groups 3-12 metal or lanthanide series metal; and
X 1 to X 3 are the same as or different from each other and are each independently selected from the group consisting of a halogen radical, an alkylamido radical having 1 to 20 carbon atoms, an arylamido radical having 6 to 60 carbon atoms, an alkyl radical having 1 to 20 carbon atoms, an alkenyl radical having 2 to 20 carbon atoms, an aryl radical having 6 to 60 carbon atoms, an alkylaryl radical having 7 to 60 carbon atoms, an arylalkyl radical having 7 to 60 carbon atoms and an alkylidene radical having 1 to 20 carbon atoms.

14 . The method for preparing the olefin-based copolymer according to claim 13 , wherein the catalyst composition further includes at least one chain shuttling agent selected from the group consisting of diethylzinc, di(i-butyl)zinc, di(n-hexyl)zinc, triethylaluminum, trioctylaluminum, triethylgallium, i-butylaluminum bis(dimethyl(t-butyl)siloxane), i-butylaluminium bis(di(trimethylsilyl)amide), n-octylaluminum di(pyridine-2-methoxide), bis(n-octadecyl)i-butylaluminum, i-butylaluminum bis(di(n-pentyl)amide), n-octylaluminum bis(2,6-di-t-butylphenoxide, n-octylaluminum di(ethyl(1-naphthyl)amide), ethylaluminum bis(t-butyldimethylsiloxide), ethylaluminum di(bis(trimethylsilyl)amide), ethylaluminum bis(2,3,6,7-dibenzo-1-azacycloheptaneamide), n-octylaluminum bis(2,3,6,7-dibenzo-1-azacycloheptaneamide), n-octylaluminum bis(dimethyl(t-butyl)siloxide, ethylzinc (2,6-diphenylphenoxide), and eth

Assignees

• Lg Chemical Ltd

Inventors

• Kim Seul Ki
• Lee Eun Jung
• Lee Choong Hoon
• Han Ki Won
• Jang Jae Kwon
• Han Hyo Jung
• Park In Sung

Classifications

• C08F210/16 Primary

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

• C08F4/65922

  containing at least two cyclopentadienyl rings, fused or not · CPC title

• C08F4/659

  Component covered by group C08F4/64 containing a transition metal-carbon bond {(C08F4/64003 - C08F4/64196 take precedence)} · CPC title

• C08F4/642

  Component covered by group C08F4/64 with an organo-aluminium compound {(C08F4/64003 - C08F4/64196 take precedence)} · CPC title

• C08F2500/01

  High molecular weight, e.g. >800,000 Da. · CPC title