US11118043B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11118043-B2 |
| Application number | US-201716088932-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 30, 2017 |
| Priority date | Mar 31, 2016 |
| Publication date | Sep 14, 2021 |
| Grant date | Sep 14, 2021 |
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The crosslinked polyolefin resin foam of the present invention is a crosslinked polyolefin resin foam obtained by crosslinking and foaming a polyolefin resin composition comprising a polypropylene resin and an olefin rubber; the olefin rubber having a Mooney viscosity (ML1+4, 100° C.) of 15 to 85; the olefin rubber being contained in an amount of 10 to 150 parts by mass relative to 100 parts by mass of the polypropylene resin; the foam having a 25% compressive hardness of 30 to 70 kPa and a compressive strength ratio, 25% compressive strength/5% compressive strength, of 2.0 to 4.5. According to the present invention, a crosslinked polyolefin resin foam from which a molded product excellent in appearance can be obtained even in a secondary processing to a complicated shape without impairment of flexibility, and a molded product made from the same are provided.
Opening claim text (preview).
The invention claimed is: 1. A crosslinked polyolefin resin foam obtained by crosslinking and foaming a polyolefin resin composition comprising an ethylene-propylene random copolymer and an olefin rubber, the olefin rubber comprising an ethylene-propylene-diene copolymer and a thermoplastic olefin elastomer, the ethylene-propylene-diene copolymer having a Mooney viscosity (ML 1+4 , 100° C.) of 15 to 85, the ethylene-propylene-diene copolymer being contained in an amount of 33.3 to 60 parts by mass relative to 100 parts by mass of the ethylene-propylene random copolymer, the thermoplastic olefin elastomer being contained in an amount of 33.3 to 40 parts by mass relative to 100 parts by mass of the ethylene-propylene random copolymer, and the foam having a 25% compressive hardness of 30 to 70 kPa and a compressive strength ratio, 25% compressive strength/ 5% compressive strength, of 2.0 to 4.5, wherein the crosslinking degree of the whole polyolefin resin foam is 30 to 65%. 2. A molded product obtained by molding the crosslinked polyolefin resin foam according to claim 1 . 3. The molded product according to claim 2 , having a skin material laminated on the crosslinked polyolefin resin foam so as to be integrated. 4. The molded product according to claim 2 for use as materials for vehicle interior. 5. The crosslinked polyolefin resin foam according to claim 1 , wherein the crosslinking is performed by irradiating with an electron beam. 6. The crosslinked polyolefin resin foam according to claim 1 , wherein the thermoplastic olefin elastomer has a melt flow rate of 0.8 to 5.0g/10 min.
Chemical features in the manufacture of articles consisting of a foamed macromolecular core and a macromolecular surface layer having a higher density than the core · CPC title
Extrusion of the foamable blend · CPC title
Ethene-propene or ethene-propene-diene copolymers · CPC title
Crosslinking before of after foaming · CPC title
characterized by the use of several polymeric components · CPC title
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