Foamable polypropylene resin composition and molded body

Patent metadata

Field	Value
Publication number	US-10106663-B2
Application number	US-201715635620-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Aug 3, 2016
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A foamable polypropylene resin composition includes 10 parts by mass to 65 parts by mass of rubber or a thermoplastic elastomer, 18 parts by mass to 90 parts by mass of talc having a 50% particle diameter (D50) of 1 μm to 3 μm and surface-treated for increased dispersibility, 0.1 part by mass to 6.0 parts by mass of an organic crystal nucleating agent, and 5 parts by mass to 15 parts by mass of a foaming agent relative to 100 parts by mass of the polypropylene resin.

First claim

The invention claimed is:

1. A foamable polypropylene resin composition comprising:
100 parts by mass of a polypropylene resin,
10 parts by mass to 65 parts by mass of rubber or a thermoplastic elastomer,
18 parts by mass to 90 parts by mass of talc having a 50% particle diameter (D50) of 1 μm to 3 μm and surface-treated for increased dispersibility,
0.1 part by mass to 6.0 parts by mass of an organic crystal nucleating agent that affects a crystallinity of the resin,
5 parts by mass to 15 parts by mass of a foaming agent,
a higher fatty acid amide; and
a compatibilizer, wherein
a total amount of the higher fatty acid amide and the compatibilizer is 0.8 parts by mass to 15.0 parts by mass, and
a blending mass ratio of the higher fatty acid amide to the compatibilizer is 1:10 to 2:1.

2. The foamable polypropylene resin composition according to claim 1 , wherein the talc surface-treated for increased dispersibility is talc, to a surface of which siloxane is added.

3. The foamable polypropylene resin composition according to claim 1 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide, and ethylenebis(stearamide).

4. The foamable polypropylene resin composition according to claim 2 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide, and ethylenebis(stearamide).

5. A foamed polypropylene resin molded body, foam-molded from the foamable polypropylene resin composition as claimed in claim 1 , having closed cells in a foamed state, and having an average foamed cell diameter pursuant to ASTM D3576-77 of 100 μm to 300 μm.

6. The foamed polypropylene resin molded body according to claim 5 having a core layer and a skin layer, wherein crystallinity (χc) of a resin part between foamed cells of the core layer of the foamed polypropylene resin molded body is 30.0% or higher, and a ratio (χc/χs) of the crystallinity (χc) of the resin part between the foamed cells to crystallinity (χs) of a skin layer resin part of the skin layer is 1.05 or higher.

7. The foamed polypropylene resin molded body according to claim 5 , wherein flexural rigidity pursuant to ISO 178 of the foamed polypropylene resin molded body is 2.0×10 −6 Nm or higher, and puncture energy pursuant to ISO 6603-2 of the foamed polypropylene resin molded body is 4 J or higher.

8. The foamed polypropylene resin molded body according to claim 5 , wherein a critical vertical force of scratch characteristics pursuant to ISO 19252 of the foamed polypropylene resin molded body is 6.0 N or higher, and a color difference change pursuant to ISO 11664-4 of the foamed polypropylene resin molded body before and after a heat resistance test of 110° C.×600 hours is 3.0 or lower.

9. The foamed polypropylene resin molded body according to claim 6 , wherein a critical vertical force of scratch characteristics pursuant to ISO 19252 of the foamed polypropylene resin molded body is 6.0 N or higher, and a color difference change pursuant to ISO 11664-4 of the foamed polypropylene resin molded body before and after a heat resistance test of 110° C.×600 hours is 3.0 or lower.

10. The foamed polypropylene resin molded body according to claim 7 , wherein a critical vertical force of scratch characteristics pursuant to ISO 19252 of the foamed polypropylene resin molded body is 6.0 N or higher, and a color difference change pursuant to ISO 11664-4 of the foamed polypropylene resin molded body before and after a heat resistance test of 110° C.×600 hours is 3.0 or lower.

11. The foamable polypropylene resin composition according to claim 5 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide and ethylenebis(stearamide).

12. The foamable polypropylene resin composition according to claim 6 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide and ethylenebis(stearamide).

13. The foamable polypropylene resin composition according to claim 7 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide and ethylenebis(stearamide).

14. The foamable polypropylene resin composition according to claim 8 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide and ethylenebis(stearamide).

15. The foamable polypropylene resin composition according to claim 9 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide and ethylenebis(stearamide).

16. The foamable polypropylene resin composition according to claim 10 , wherein the higher fatty acid amide is selected from the group consisting of erucamide, stearamide, oleamide and ethylenebis(stearamide).

Assignees

• Toyoda Gosei Kk

Inventors

• Tanaka Yasuaki
• Uchida Hitoshi

Classifications

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08L23/0815

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

• C08L2205/02

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

• C08L23/10

  Homopolymers or copolymers of propene · CPC title

• C08J9/0061 Primary

  characterized by the use of several polymeric components · CPC title