Polypropylene

Patent metadata

Field	Value
Publication number	US-10604597-B2
Application number	US-201715765762-A
Country	US
Kind code	B2
Filing date	Feb 13, 2017
Priority date	Mar 18, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

The present invention relates to a polypropylene which exhibits high transparency and has a very low level of generation of volatile organic compounds, which has a total volatile organic compounds (TVOC) value of 60 μg/g or less, which is measured according to VDA 277 standardized by the German Automobile Industry Association by heating the polypropylene for 12 to 5 hours and converting all hydrocarbons detected per 1 g into an acetone content, and a haze value of 5% or less.

First claim

What is claimed is:

1. A polypropylene having a TVOC (total volatile organic compounds) value of 60 μg/g or less, which is measured according to VDA 277 standardized by the German Association of the Automobile Industry and means a value obtained by heating the polypropylene at 120° C. for 5 hours and converting all hydrocarbons detected per 1 g of the polypropylene into the content of acetone;
having a haze of 5% or less;
a weight average molecular weight of 100,000 to 145,000 g/mol; and
a molecular weight distribution (Mw/Mn) of 2.9 or less.

2. The polypropylene of claim 1 , wherein the polypropylene has a VOC (volatile organic compounds) value of 30 μg/g or less, which is measured according to VDA 278 standardized by the German Association of the Automobile Industry, and means a value obtained by heating the polypropylene at 90° C. for 30 minutes and converting straight chain hydrocarbons having 1 to 25 carbon atoms detected per 1 g of the polypropylene into the content of toluene.

3. The polypropylene of claim 1 , wherein the polypropylene has a FOG (fogging) value of 40 μg/g or less, which is measured according to VDA 278 standardized by the German Association of the Automobile Industry, and means a value obtained by heating the polypropylene at 120° C. for 1 hour and converting straight chain hydrocarbons having 14 to 32 carbon atoms detected per 1 g of the polypropylene into the content of hexadecane.

4. The polypropylene of claim 1 , wherein the polypropylene has a flexural strength (measured according to ASTM D790) of 400 kgf/cm 2 or more.

5. The polypropylene of claim 1 , wherein the polypropylene has a melting point (Tm) of 130° C. to 145° C., and a flexural modulus (measured according to ASTM D790) of 14,000 kgf/cm 2 or more.

6. The polypropylene of claim 1 , wherein the polypropylene has a MFR (measured at 230° C. under a load of 2.16 kg according to ASTM D1238) of 10 to 25 g/10 min.

7. The polypropylene of claim 1 , wherein the polypropylene has a tensile strength (measured according to ASTM D790) of 300 to 400 kgf/cm 2 .

8. The polypropylene of claim 1 , wherein the polypropylene is produced 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:

in Chemical Formula 1,
X is halogen, equal to or different from each other,
R 1 is C 6-20 aryl substituted with 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 alkoxysilyl, C 1-20 ether, C 1-20 silyl ether, 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,

in Chemical Formula 2,
X′ is halogen, equal to or different from each other,
R′ 1 is C 6-20 aryl substituted with 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 alkoxysilyl, C 1-20 ether, C 1-20 silyl ether, 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.

9. The polypropylene of claim 8 , wherein the hybrid supported catalyst further includes at least one of the cocatalyst compounds represented by the following Chemical Formulas 3, 4 and 5,
—[Al(R 30 )—O] m —  [Chemical Formula 3]

in Chemical Formula 3,
R 30 is equal to or different from each other, and each independently represent a halogen; a hydrocarbonyl having 1 to 20 carbon atoms; or a hydrocarbonyl having 1 to 20 carbon atoms substituted with halogen; and
m is an integer of 2 or more;
J(R 31 ) 3   [Chemical Formula 4]

in Chemical Formula 4,
R 31 is as R 30 defined in Chemical Formula 3;
J is aluminum or boron;
[E-H] + [ZA 4 ] − or [E] + [ZA 4 ] −   [Chemical Formula 5]

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 is equal to or different from each other, and each independently represents an aryl group having 6 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms, in which one or more hydrogen atoms are substituted or unsubstituted with a halogen, a hydrocarbonyl having 1 to 20 carbon atoms, an alkoxy or a phenoxy.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Ji Ho
• Jung In Yong
• Noh Kyung Seop
• Lee Won-Sang
• Jeon Sang Jin
• An Sang Eun
• Lee Sang Hoon

Classifications

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F2500/04

  Broad molecular weight distribution, i.e. Mw/Mn > 6 · CPC title

• C08F10/06 Primary

  Propene · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F4/65927

  two cyclopentadienyl rings being mutually bridged · CPC title