Eco-friendly polypropylene composition and vehicle interior material containing the same

Patent metadata

Field	Value
Publication number	US-2025188283-A1
Application number	US-202418437831-A
Country	US
Kind code	A1
Filing date	Feb 9, 2024
Priority date	Dec 7, 2023
Publication date	Jun 12, 2025
Grant date	—

Abstract

An embodiment polypropylene composition includes a composite including wood flour and a low molecular weight hydrocarbon-based material, a highly crystalline polypropylene-based resin, a graft-modified polypropylene-based resin, and a fiber filler. In an embodiment, the composition includes 35 wt % to 45 wt % of the composite, 30 wt % to 40 wt % of the highly crystalline polypropylene-based resin, 1 wt % to 5 wt % of the graft-modified polypropylene-based resin, and 15 wt % to 25 wt % of the fiber filler.

First claim

What is claimed is:

1 . A polypropylene composition comprising:
a composite comprising wood flour and a low molecular weight hydrocarbon-based material; a highly crystalline polypropylene-based resin; a graft-modified polypropylene-based resin; and a fiber filler.

2 . The composition of claim 1 , wherein the composition comprises:
35 wt % to 45 wt % of the composite; 30 wt % to 40 wt % of the highly crystalline polypropylene-based resin; 1 wt % to 5 wt % of the graft-modified polypropylene-based resin; and 15 wt % to 25 wt % of the fiber filler.

3 . The composition of claim 1 , wherein a content of the wood flour is 60 wt % to 80 wt % with respect to 100 wt % of the composite.

4 . The composition of claim 1 , wherein a weight-average molecular weight of the low molecular weight hydrocarbon-based material is 500 or less.

5 . The composition of claim 1 , wherein the highly crystalline polypropylene-based resin comprises a first polypropylene-based resin having an isotactic pentad fraction of 96% or more by 13C-NMR.

6 . The composition of claim 5 , wherein the highly crystalline polypropylene-based resin further comprises a second polypropylene-based resin comprising a propylene-ethylene copolymer.

7 . The composition of claim 5 , wherein a content of the first polypropylene-based resin is 20 wt % or more with respect to a total weight of the composition.

8 . The composition of claim 5 , wherein a melt index of the first polypropylene-based resin is 30 g/min to 70 g/min at a temperature of 230° C. and a load of 2.16 kg.

9 . The composition of claim 1 , wherein the graft-modified polypropylene-based resin is configured such that 1 mol % to 2 mol % thereof is graft-modified with a material selected from the group consisting of maleic anhydride, acrylic acid, methacrylic acid, and combinations thereof.

10 . The composition of claim 1 , wherein the fiber filler has a length of 3 mm to 10 mm and an average diameter of 4 μm to 20 μm.

11 . The composition of claim 1 , wherein the fiber filler comprises a fiber selected from the group consisting of glass fiber, carbon fiber, metal oxide fiber, and combinations thereof.

12 . The composition of claim 1 , wherein the composition has:
a tensile strength of 26 MPa or more according to ISO 725; a flexural modulus of 2450 MPa or more according to ISO 178; and an IZOD impact strength of 4.0 J/m or more according to ISO 180.

13 . A vehicle comprising:
a vehicle body defining a vehicle interior therein; and a vehicle interior material disposed in the vehicle interior, the vehicle interior material comprising a polypropylene composition, the composition comprising:
a composite comprising wood flour and a low molecular weight hydrocarbon-based material;
a highly crystalline polypropylene-based resin;
a graft-modified polypropylene-based resin; and
a fiber filler.

14 . The vehicle of claim 13 , wherein the composition comprises:
35 wt % to 45 wt % of the composite; 30 wt % to 40 wt % of the highly crystalline polypropylene-based resin; 1 wt % to 5 wt % of the graft-modified polypropylene-based resin; and 15 wt % to 25 wt % of the fiber filler.

15 . The vehicle of claim 13 , wherein:
a content of the wood flour is 60 wt % to 80 wt % with respect to 100 wt % of the composite; a weight-average molecular weight of the low molecular weight hydrocarbon-based material is 500 or less; the highly crystalline polypropylene-based resin comprises a polypropylene-based resin having an isotactic pentad fraction of 96% or more by 13C-NMR; and the fiber filler has a length of 3 mm to 10 mm and an average diameter of 4 μm to 20 μm.

16 . A polypropylene composition comprising:
35 wt % to 45 wt % of a composite comprising wood flour and a low molecular weight hydrocarbon-based material; 30 wt % to 40 wt % of a highly crystalline polypropylene-based resin; 1 wt % to 5 wt % of a graft-modified polypropylene-based resin; and 15 wt % to 25 wt % of a fiber filler; wherein the composition has a tensile strength of 26 MPa or more according to ISO 725; wherein the composition has a flexural modulus of 2450 MPa or more according to ISO 178; and wherein the composition has an IZOD impact strength of 4.0 J/m or more according to ISO 180.

17 . The composition of claim 16 , wherein a content of the wood flour is 60 wt % to 80 wt % with respect to 100 wt % of the composite.

18 . The composition of claim 16 , wherein a weight-average molecular weight of the low molecular weight hydrocarbon-based material is 500 or less.

19 . The composition of claim 16 , wherein the highly crystalline polypropylene-based resin comprises a first polypropylene-based resin having an isotactic pentad fraction of 96% or more by 13C-NMR.

20 . The composition of claim 16 , wherein the fiber filler has a length of 3 mm to 10 mm and an average diameter of 4 μm to 20 μm.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Mika Inc

Inventors

• Kim Dae Sik
• Bak Mun Gyu
• Lee Han Ki
• Lee Jun Ho
• Kim Jong Hyeon
• Sung Im Taek

Classifications

• C08L97/02 Primary

  Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K2201/004

  Additives being defined by their length · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title