High-stiffness and energy-reducing polypropylene for foaming

Patent metadata

Field	Value
Publication number	US-10889667-B2
Application number	US-201715749249-A
Country	US
Kind code	B2
Filing date	Feb 13, 2017
Priority date	Feb 17, 2016
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

The present invention relates to a polypropylene having excellent stiffness and achieving energy reduction during foaming.

First claim

The invention claimed is:

1. A polyethylene polypropylene having:
a melt index (MI), measured at 230° C. under a load of 2.16 kg according to ASTM D1238, of 4 to 60 g/10 min,
a melting point (Tm) of 130° C. to 140° C.,
a flexural modulus, measured according to ASTM 790, of 9,000 to 18,000 kgf/cm 2 , and
a crystallization temperature of 80° C. to 105° C.

2. The polypropylene according to claim 1 ,
wherein the polypropylene has a molecular weight distribution (Mw/Mn) of 2.5 to 3.5.

3. The polypropylene according to claim 1 ,
wherein the polypropylene has a weight average molecular weight of 150,000 to 350,000.

4. The polypropylene according to claim 1 ,
wherein the polypropylene is prepared by polymerizing propylene in the presence of a hybrid supported catalyst comprising a compound represented by the following Chemical Formula 1, a compound represented by the following Chemical Formula 2 and a support:

wherein in Chemical Formula 1,
X is a halogen, same as or different from each other,
R 1 is a C 6-20 aryl substituted with a C 1-20 alkyl,
R 2 , R 3 and R 4 are each independently hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 1-20 alkylsilyl, C 1-20 silylalkyl, alkoxysilyl, C 1-20 ether, C 1-20 silylether, C 1-20 alkoxy, C 6-20 aryl, C 7-20 alkylaryl, or C 7-20 arylalkyl,
A is carbon, silicon, or germanium,
R 5 is C 1-20 alkyl substituted with C 1-20 alkoxy, and
R 6 is hydrogen, C 1-20 alkyl, or C 2-20 alkenyl,

wherein in Chemical Formula 2,
X′ is a halogen, same as or different from each other,
R′ 1 is a C 6-20 aryl substituted with a C 1-20 alkyl,
R′ 2 , R′ 3 and R′ 4 , are each independently hydrogen, halogen, C 1-20 alkyl, C 2-20 alkenyl, C 1-20 alkylsilyl, C 1-20 silylalkyl, C 1-20 C 1-20 ether, C 1-20 silylether, C 1-20 alkoxy, C 6-20 aryl, C 7-20 alkylaryl, or C 7-20 arylalkyl,
A is carbon, silicon, or germanium,
R′ 5 is a C 1-20 alkyl substituted with a C 1-20 alkoxy, and
R′ 6 is hydrogen, a C 1-20 alkyl, or a C 2-20 alkenyl.

5. The polypropylene according to claim 4 , wherein the hybrid supported catalyst further includes at least one of a compound represented by the following Chemical Formula 3, a compound represented by the following Chemical Formula 4 and a compound represented by the following Chemical Formula 5:
—[Al(R 30 )—O] m —  [Chemical Formula 3]

wherein in Chemical Formula 3,
R 30 may be the same as or different from each other, and each independently a halogen; a hydrocarbon having 1 to 20 carbon atoms; or a halogen-substituted hydrocarbyl group having 1 to 20 carbon atoms, and
m is an integer of 2 or more,
J[R 31 ] 3   [Chemical Formula 4]

wherein in Chemical Formula 4,
R 31 is as defined in Chemical Formula 3; and
J is aluminum or boron;
[E-H] + [ZA 4 ] − or [E] + [ZA 4 ] −   [Chemical Formula 5]

wherein in Chemical Formula 5,
E is a neutral or cationic Lewis base;
H is a hydrogen atom;
Z is a Group 13 element; and
A may be the same as or different from each other, and each independently an aryl group having 6 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms in which at least one halogen is substituted or unsubstituted with halogen, C 1 -C 20 hydrocarbon, alkoxy or phenoxy.

Assignees

• Lg Chemical Ltd

Inventors

• Park Jin Hyun
• Choi Ji Ho
• Noh Kyung Seop
• Jeon Sang Jin
• An Sang Eun
• Choi Ra Yun
• Lee In Sun

Classifications

• C08F110/06 Primary

  Propene · CPC title

• C08F2420/10

  Heteroatom-substituted bridge, i.e. Cp or analog where the bridge linking the two Cps or analogs is substituted by at least one group that contains a heteroatom · CPC title

• C08F2500/03

  Narrow molecular weight distribution, i.e. Mw/Mn < 3 · CPC title

• C08F10/02

  Ethene · CPC title

• C08F4/65927

  two cyclopentadienyl rings being mutually bridged · CPC title