Polypropylene-based resin composition

Patent metadata

Field	Value
Publication number	US-10954366-B2
Application number	US-201716305668-A
Country	US
Kind code	B2
Filing date	Sep 18, 2017
Priority date	Sep 23, 2016
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

The present invention relates to a polypropylene-based resin composition which exhibits mechanical properties such as excellent strength, etc. and has an improved impact strength, and to a molded article including the same. The olefin-based copolymer includes: a polypropylene-based resin; and an olefin-based copolymer, wherein the olefin-based copolymer includes polymeric fractions defined by three different peaks at a given temperature when analyzed by cross-fractionation chromatography (CFC).

First claim

The invention claimed is:

1. A polypropylene-based resin composition comprising:
a polypropylene-based resin; and an olefin-based copolymer containing an ethylene repeating unit and an alpha-olefin 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) 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 25%.

2. The polypropylene-based resin composition 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 polypropylene-based resin composition 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 polypropylene-based resin composition according to claim 1 , wherein the central peak temperature of the third peak of the olefin-based copolymer 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 25%.

5. The polypropylene-based resin composition according to claim 1 , wherein the third fraction of the olefin-based copolymer 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 polypropylene-based resin composition according to claim 1 , wherein the olefin-based copolymer has a melting point of 100° C. to 140° C. as measured by DSC.

7. The polypropylene-based resin composition 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 polypropylene-based resin composition according to claim 1 , wherein the olefin-based copolymer has a density of 0.85 g/cc to (191 g/cc.

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

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

11. The polypropylene-based resin composition according to claim 1 , wherein the polypropylene-based resin comprises at least one of polypropylene homopolymer, propylene-alpha-olefin copolymer, or propylene-ethylene-alpha-olefin copolymer.

12. The polypropylene-based resin composition according to claim 1 , wherein the composition contains 50 to 90% by weight of the polypropylene-based resin, and 10 to 50% by weight of the olefin-based copolymer.

13. The polypropylene-based resin composition according to claim 1 , wherein the alpha-olefin repeating unit is a repeating unit derived from at least one alpha-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.

14. A polypropylene-based resin composition comprising:
a polypropylene-based resin; and an olefin-based copolymer containing an ethylene repeating unit and an alpha-olefin 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) of 85″C to 130° C., 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.

15. A molded product comprising the polypropylene-based resin composition of claim 1 .

16. The polypropylene-based resin composition according to claim 1 , wherein the olefin-based copolymer has a weight average molecular weight of about 30,000 to 200,000 g/mol, and a molecular weight distribution of 2.0 or more.

17. The polypropylene-based resin composition according to claim 1 , wherein the olefin-based copolymer is produced by a preparation method comprising the step of copolymerizing ethylene and alpha-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,
R 1 and R 2 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 R 1 and R 2 are optionally connected to each other by an alkylidene radical containing an alkyl having 1 to 20 carbon atoms or aryl having from 6 to 20 carbon atoms to form a ring;
each R 3 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, an aryloxy radical having 6 to 20 carbon atoms, or an amido radical; and
two or more of the R 3 are optionally connected to each other to form an aliphatic or aromatic ring;
CY 1 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

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

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F2420/05

  Cp or analog where at least one of the carbon atoms of the coordinating ring is replaced by a heteroatom · CPC title

• C08F2420/02

  Cp or analog bridged to a non-Cp X anionic donor · CPC title

• C08F10/06

  Propene · CPC title

• C08F2500/18

  Bulk density · CPC title