Polyolefin resin foams and molded articles

Abstract

With respect to a polyolefin resin foam according to the present invention, the coefficient of variation of cell diameter in the transverse direction (TD) and the coefficient of variation of cell diameter in the thickness direction (ZD) per 50 cells in the foam are 0.38 or less; the coefficient of variation of cell flatness ratio is 0.45 or less; the coefficient of variation of cell area is 0.65 or less; a polyolefin resin and at least one filler that is selected from among a metal oxide and a metal hydroxide are contained therein; and the content of the filler is 0.3% by mass or more relative to the total amount of the polyolefin resin foam.　The present invention is able to provide: a polyolefin resin foam which is capable of reducing the generation of an odor; and a molded article which is obtained by molding this polyolefin resin foam.

Claims

1. For every 50 bubbles contained in the foam, the coefficient of variation of the bubble diameter in the width direction (TD) and the coefficient of variation of the bubble diameter in the thickness direction (ZD) are 0.38 or less, the coefficient of variation of the bubble flatness ratio is 0.45 or less, and the coefficient of variation of the bubble area is 0.65 or less. A polyolefin resin foam comprising a polyolefin resin and at least one filler selected from the group consisting of magnesium oxide, titanium oxide, zinc oxide, aluminum oxide, magnesium hydroxide, aluminum hydroxide, and iron hydroxide, wherein the content of the filler is 0.3% by mass or more relative to the total amount of the polyolefin resin foam, and is in sheet form, and is a polyolefin resin foam obtained by crosslinking and foaming a foaming composition containing a chemical blowing agent, and is a crosslinked polyolefin resin foam.

2. The polyolefin resin foam according to claim 1, wherein the coefficient of variation of the bubble diameter in the width direction (TD) is 0.35 or less.

3. The polyolefin-based resin foam according to claim 1 or 2, wherein the coefficient of variation of the bubble diameter in the thickness direction (ZD) is 0.33 or less.

4. The polyolefin resin foam according to claim 1 or 2, wherein the coefficient of variation of the cell flatness is 0.40 or less.

5. The polyolefin-based resin foam according to claim 1 or 2, wherein the coefficient of variation of the bubble area is 0.60 or less.

6. The polyolefin resin foam according to claim 1 or 2, wherein the content of the filler is 0.5% by mass or more relative to the total amount of the polyolefin resin foam.

7. The polyolefin resin foam according to claim 1 or 2, wherein the filler is at least one selected from the group consisting of magnesium oxide, titanium oxide, zinc oxide, and aluminum oxide.

8. The polyolefin resin foam according to claim 1 or 2, wherein the polyolefin resin contains a polypropylene resin.

9. For every 50 bubbles contained in the foam, the coefficient of variation of the bubble diameter in the width direction (TD) and the coefficient of variation of the bubble diameter in the thickness direction (ZD) are 0.38 or less, the coefficient of variation of the bubble flatness ratio is 0.45 or less, and the coefficient of variation of the bubble area is 0.65 or less. A polyolefin resin foam comprising a polyolefin resin and at least one filler selected from the group consisting of magnesium oxide, titanium oxide, zinc oxide, aluminum oxide, magnesium hydroxide, aluminum hydroxide, and iron hydroxide, wherein the content of the filler is 0.4 parts by mass or more per 100 parts by mass of the polyolefin resin, and is in sheet form, and is a polyolefin resin foam obtained by crosslinking and foaming a foaming composition containing a chemical blowing agent.

10. A molded article obtained by molding a polyolefin resin foam according to claim 1 or 2.

11. The molded article according to claim 10, wherein a surface material is laminated on at least one surface of the polyolefin resin foam.

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