Polypropylene-based composite material and method for preparing the same

Patent metadata

Field	Value
Publication number	US-12065515-B2
Application number	US-202017603210-A
Country	US
Kind code	B2
Filing date	Aug 27, 2020
Priority date	Aug 28, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

The present invention relates to a polypropylene-based composite material having improved physical properties including impact strength at low temperature and at room temperature, flexural strength, flexural modulus, etc., and a method for preparing the same.

First claim

The invention claimed is:

1. A polypropylene-based composite material comprising
polypropylene; and
an olefin-based copolymer satisfying the following conditions (a) to (c):
(a) a melt index (MI, 190° C., 2.16 kg load conditions) is 10 to 100 g/10 min,
(b) a soluble fraction (SF) at −20° C. measured by cross-fractionation chromatography (CFC) is 0.5 to 10 wt %, where a weight average molecular weight of the soluble fraction (Mw(SF)) is 22,000 or more, and
(c) a value of Mw:Mw(SF), which is a ratio of a weight average molecular weight of the olefin-based copolymer (Mw) and the weight average molecular weight of the soluble fraction (Mw(SF), is 0.9:1 to 2:1.

2. The polypropylene-based composite material according to claim 1 , wherein the polypropylene is an impact copolymer having a melt index (230° C., 2.16 kg load conditions) of 0.5 to 150 g/10 min.

3. The polypropylene-based composite material according to claim 1 , wherein the weight average molecular weight of the olefin-based copolymer is from 10,000 to 100,000 g/mol.

4. The polypropylene-based composite material according to claim 1 , wherein the olefin-based copolymer has a molecular weight distribution of 1.5 to 3.0.

5. The polypropylene-based composite material according to claim 1 , wherein the polypropylene-based composite material comprises the olefin-based copolymer in 5 to 70 wt %.

6. The polypropylene-based composite material according to claim 1 , wherein the olefin-based copolymer is a copolymer of ethylene and an alpha-olefin-based comonomer of 3 to 12 carbon atoms.

7. The polypropylene-based composite material according to claim 1 , wherein the polypropylene is propylene-ethylene impact copolymer.

8. The polypropylene-based composite material according to claim 1 , wherein the olefin-based copolymer has a density of 0.85 g/cc to 0.89 g/cc measured according to ASTM D-792.

9. The polypropylene-based composite material according to claim 1 , wherein the olefin-based copolymer has a hardness (shore A) of 30 to 80.

10. The polypropylene-based composite material according to claim 1 , wherein the olefin-based copolymer is a copolymer of ethylene with propylene, ethylene with 1-butene, ethylene with 1-hexene, ethylene with 4-methyl-1-pentene or ethylene with 1-octene.

11. A method for preparing the polypropylene-based composite material of claim 1 , the method comprising
(S1) a step of preparing polypropylene;
(S2) a step of preparing an olefin-based copolymer comprising polymerizing an olefin-based monomer by injecting hydrogen in 10 to 100 cc/min in the presence of a catalyst composition comprising a transition metal compound represented by the following Formula 1; and
(S3) a step of melting and kneading the polypropylene and the olefin-based copolymer:

in Formula 1,
R 1 is hydrogen; alkyl of 1 to 20 carbon atoms; alkenyl of 2 to 20 carbon atoms; alkoxy of 1 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; arylalkoxy of 7 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; or arylalkyl of 7 to 20 carbon atoms,
R 2 and R 3 are each independently hydrogen; halogen; alkyl of 1 to 20 carbon atoms; alkenyl of 2 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; arylalkyl of 7 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; alkylamido of 1 to 20 carbon atoms; or arylamido of 6 to 20 carbon atoms,
R 4 to R 9 are each independently hydrogen; silyl; alkyl of 1 to 20 carbon atoms; alkenyl of 2 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; arylalkyl of 7 to 20 carbon atoms; or a metalloid radical of a metal in group 14, which is substituted with hydrocarbyl of 1 to 20 carbon atoms,
adjacent two or more among the R 2 to R 9 are optionally connected with each other to form a ring,
Q is Si; C; N; P; or S,
M is a transition metal in group 4, and
X 1 and X 2 are each independently hydrogen; halogen; alkyl of 1 to 20 carbon atoms; alkenyl of 2 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; arylalkyl of 7 to 20 carbon atoms; alkylamino of 1 to 20 carbon atoms; or arylamino of 6 to 20 carbon atoms.

12. The method for preparing the polypropylene-based composite material according to claim 11 , wherein
R 1 is hydrogen; alkyl of 1 to 20 carbon atoms; alkoxy of 1 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; arylalkoxy of 7 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; or arylalkyl of 7 to 20 carbon atoms,
R 2 and R 3 are each independently hydrogen; alkyl of 1 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; or alkylaryl of 6 to 20 carbon atoms,
R 4 to R 9 are each independently hydrogen; alkyl of 1 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; alkylaryl of 7 to 20 carbon atoms; or arylalkyl of 7 to 20 carbon atoms,
adjacent two or more among the R 2 to R 9 are optionally connected with each other to form an aliphatic ring of 5 to 20 carbon atoms or an aromatic ring of 6 to 20 carbon atoms,
the aliphatic ring and the aromatic ring are optionally substituted with halogen, alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 20 carbon atoms, or aryl of 6 to 20 carbon atoms, and
Q is Si; C; N; or P.

13. The method for preparing the polypropylene-based composite material according to claim 11 , wherein
R 1 is alkyl of 1 to 20 carbon atoms; aryl of 6 to 20 carbon atoms; arylalkoxy of 7 to 20 carbon atoms; or arylalkyl of 7 to 20 carbon atoms,
R 2 and R 3 are each independently hydrogen; alkyl of 1 to 20 carbon atoms; or aryl of 6 to 20 carbon atoms,
R 4 to R 9 are each independently hydrogen; alkyl of 1 to 20 carbon atoms; or aryl of 6 to 20 carbon atoms, and
Q is Si.

14. The method for preparing the polypropylene-based composite material according to claim 11 , wherein the transition metal compound represented by Formula 1 is selected from the group consisting of compounds of the following Formula 1-1 to Formula 1-6:

15. The method for preparing the polypropylene-based composite material according to claim 7 , wherein the polymerization is carried out at 50 to 200° C.

Assignees

• Lg Chemical Ltd

Inventors

• Park Sang Eun
• Park In Sung
• Lee Eun Jung
• Ju Hyun Jin
• Kim Tae Su
• Lee Choong Hoon
• Gong Jin Sam
• Jun Jung Ho
• Gwak Rae Keun

Classifications

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2203/30

  used for thermoforming · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08F4/6592

  containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title