Photovoltaic module backsheet comprising polyolefin layers
US-2024063320-A1 · Feb 22, 2024 · US
Crosslinked polyolefin foam
US2021102039A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2021102039-A1 |
| Application number | US-202017118866-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 11, 2020 |
| Priority date | Sep 30, 2014 |
| Publication date | Apr 8, 2021 |
| Grant date | — |
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Abstract
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A crosslinked polyolefin foam that is a crosslinked foam of a polyolefin resin composition, the composition comprising a polyolefin resin (A) and a rubber (B) having a Mooney viscosity (ML1+4, 100° C.) of 15 to 85. The rubber (B) is contained in an amount of 10 to 150 parts by mass relative to 100 parts by mass of the polyolefin resin (A). The foam has a thickness of 1.5 mm or more, a 25% compressive hardness of 60 kPa or less, and a crosslinking degree of at least one of surface layers at both surfaces with a depth of 500 μm from the surface that is at least 5% higher than the crosslinking degree of the middle layer excluding the both surface layers.
First claim
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1 . A crosslinked polyolefin foam that is a crosslinked foam of a polyolefin resin composition, the composition comprising: a polyolefin resin (A); and a rubber (B) having a Mooney viscosity (ML 1+4 , 100° C.) of 15 to 85, wherein: the rubber (B) is contained in an amount of 10 to 150 parts by mass relative to 100 parts by mass of the polyolefin resin (A), the foam has a thickness of 1.5 mm or more, a 25% compressive hardness of 60 kPa or less, and a crosslinking degree of at least one of surface layers at both surfaces with a depth of 500 μm from the surface that is at least 5% higher than a crosslinking degree of a middle layer excluding the surface layers at both surfaces, the crosslinking degree of the entire foam is 30 to 55%, and the polyolefin resin (A) comprises a linear low-density polyethylene resin. 2 . The crosslinked polyolefin foam according to claim 1 , wherein the rubber (B) is at least one selected from the group consisting of a styrene rubber and an olefin rubber. 3 . The crosslinked polyolefin foam according to claim 2 , wherein the rubber (B) is an olefin rubber. 4 . (canceled) 5 . The crosslinked polyolefin foam according to claim 1 , wherein the polyolefin resin (A) further comprises a polypropylene resin. 6 . The crosslinked polyolefin foam according to claim 5 , wherein a content of the linear low-density polyethylene resin is 1 to 100 parts by mass relative to 100 parts by mass of the polypropylene resin. 7 . (canceled) 8 . The crosslinked polyolefin foam according to claim 5 , wherein the polypropylene resin is an ethylene-propylene random copolymer. 9 . The crosslinked polyolefin foam according to claim 1 , wherein the crosslinking degree of each of the surface layers at both surfaces is at least 5% higher than the crosslinking degree of the middle layer. 10 . A molded product obtained by molding the crosslinked polyolefin foam according to claim 1 .
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- What does patent US2021102039A1 cover?
- A crosslinked polyolefin foam that is a crosslinked foam of a polyolefin resin composition, the composition comprising a polyolefin resin (A) and a rubber (B) having a Mooney viscosity (ML1+4, 100° C.) of 15 to 85. The rubber (B) is contained in an amount of 10 to 150 parts by mass relative to 100 parts by mass of the polyolefin resin (A). The foam has a thickness of 1.5 mm or more, a 25% compr…
- Who is the assignee on this patent?
- Sekisui Chemical Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08L23/12. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Apr 08 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).