Propylene-ethylene random copolymer

Patent metadata

Field	Value
Publication number	US-12065560-B2
Application number	US-202017602495-A
Country	US
Kind code	B2
Filing date	Jun 11, 2020
Priority date	Jun 11, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

The present disclosure relates to a propylene-ethylene random copolymer for high transparency injection that has a low total volatile organic compound emission (TVOC), excellent processability, and maximizing ethylene content.

First claim

The invention claimed is:

1. A propylene-ethylene random copolymer having:
a melting point (Tm) of 125° C. or higher,
an ethylene content of 4.0% by weight or more,
a crystallization temperature (Tc) of 75° C. or lower, and
a melt index (MI 2.16 , melt index measured at 230° C., 2.16 kg load) of 16 g/10 min to 22 g/10 min.

2. The propylene-ethylene random copolymer of claim 1 , wherein the melting point (Tm) is 125° C. to 150° C.

3. The propylene-ethylene random copolymer of claim 1 , wherein the ethylene content is 4.0% by weight to 5.5% by weight.

4. The propylene-ethylene random copolymer of claim 1 , wherein the crystallization temperature (Tc) is 65° C. to 75° C.

5. The propylene-ethylene random copolymer of claim 1 , which has a xylene soluble content (X·S) of 1.0% by weight or less.

6. The propylene-ethylene random copolymer of claim 1 , which has a haze measured according to American Society for Testing and Materials, ASTM 1003 method of 7.5% or less.

7. The propylene-ethylene random copolymer of claim 1 , which has a total volatile organic compound emission (TVOC) of 70 ppm or less, measured according to the VDA 277 method.

8. The propylene-ethylene random copolymer of claim 1 , wherein the propylene-ethylene random copolymer is prepared by copolymerizing propylene monomer and ethylene comonomer in the presence of a catalyst composition including a metallocene compound of the following Chemical Formula 1:

in Chemical Formula 1,
M is a Group 4 transition metal,
X 1 and X 2 are the same as or different from each other, and are each independently halogen,
R 1 and R 2 are the same as or different from each other, and are each independently C 1-20 alkyl, C 2-20 alkenyl, C 2-20 alkoxyalkyl, C 6-20 aryl, C 7-40 alkylaryl, or C 7-40 arylalkyl,
R 3 to R 6 are the same as or different from each other, and are each independently C 1-20 alkyl,
R 7 is substituted or unsubstituted C 6-20 aryl, and
R 8 is C 1-20 alkyl.

9. The propylene-ethylene random copolymer of claim 8 , wherein
the R 1 and R 2 are each independently C 1-8 linear or branched alkyl, or C 2-12 linear or branched alkoxyalkyl,
the R 3 to R 6 are each independently C 1-6 linear or branched alkyl,
the M is zirconium or hafnium,
the R 7 is phenyl, phenyl substituted with C 1-6 linear or branched alkyl, naphthyl, or naphthyl substituted with C 1-6 linear or branched alkyl, and
the R 8 is C 1-6 linear or branched alkyl.

10. The propylene-ethylene random copolymer previously, wherein the metallocene compound is represented by the following Chemical Formula 1-1:

in Chemical Formula 1-1,
M, X 1 , X 2 , R 1 , R 2 , and R 7 are as defined in claim 8 .

11. The propylene-ethylene random copolymer of claim 8 , wherein the metallocene compound is any one of compounds represented by the following structural formulae:

Assignees

• Lg Chemical Ltd

Inventors

• Kim Byung Seok
• Lee Insun
• Kim Seok Hwan
• Lee Jung Won
• Gwon Donghyeon
• Kim Seyoung
• Park Heekwang
• Ye Jihwa

Classifications

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F2500/34

  Melting point [Tm] · CPC title

• C08F2500/27

  Amount of comonomer in wt% or mol% · CPC title

• C08F210/16

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

• C08F210/02

  Ethene · CPC title