Laminate, optical member, and optical apparatus
US-2024409789-A1 · Dec 12, 2024 · US
Double-faced pressure-sensitive adhesive sheet
US2025346790A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025346790-A1 |
| Application number | US-202318871293-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 22, 2023 |
| Priority date | Jun 27, 2022 |
| Publication date | Nov 13, 2025 |
| Grant date | — |
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- Title
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Abstract
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A thin double-faced PSA sheet capable of combining processability and impact resistance is provided. Provided is a double-faced PSA sheet having a first PSA layer, at least one middle layer, and a second PSA layer in this order. The double-faced PSA sheet has a total thickness of 60 μm or less. The middle layer has a thickness accounting for 10% to 60% of the total thickness, is formed from a water-dispersed material, and has a Young's modulus in the range of 1.5 MPa to 1500 MPa.
First claim
Opening claim text (preview).
1 . A double-faced pressure-sensitive adhesive sheet comprising a first pressure-sensitive adhesive layer, at least one middle layer, and a second pressure-sensitive adhesive layer in this order, wherein the double-faced pressure-sensitive adhesive sheet has a total thickness of 60 μm or less, the middle layer has a thickness accounting for 10% to 60% of the total thickness, the middle layer is formed from a water-dispersed material, and the middle layer has a Young's modulus in the range of 1.5 MPa to 1500 MPa. 2 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , wherein the middle layer has a storage modulus in the range of 7.0×10 6 Pa to 5.0×10 9 Pa at a temperature of 25° C. and at a frequency of 160 Hz. 3 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , wherein the middle layer has a storage modulus of 3.7×10 9 Pa or lower at a temperature of 25° C. and at a frequency of 1000 Hz to 10000 Hz. 4 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , wherein the middle layer comprises a polyurethane-based resin, rubber, polyolefinic resin, acrylic resin, or a blend thereof. 5 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , wherein each of the first and second pressure-sensitive adhesive layers is formed from a water-dispersed pressure-sensitive adhesive composition. 6 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , wherein each of the first and second pressure-sensitive adhesive layers is an acrylic pressure-sensitive adhesive layer comprising an acrylic polymer. 7 . The double-faced pressure-sensitive adhesive sheet according to claim 6 , wherein the acrylic polymer has a glass transition temperature of −25° C. or lower. 8 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , having a 1800 peel strength on stainless-steel plate of 6 N/20 mm or greater. 9 . The double-faced pressure-sensitive adhesive sheet according to claim 1 , in use for fixing a member in a portable electronic device.
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in the substrate · CPC title
in the substrate · CPC title
in the substrate · CPC title
Presence of (meth)acrylic polymer · CPC title
in the substrate · CPC title
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- What does patent US2025346790A1 cover?
- A thin double-faced PSA sheet capable of combining processability and impact resistance is provided. Provided is a double-faced PSA sheet having a first PSA layer, at least one middle layer, and a second PSA layer in this order. The double-faced PSA sheet has a total thickness of 60 μm or less. The middle layer has a thickness accounting for 10% to 60% of the total thickness, is formed from a w…
- Who is the assignee on this patent?
- Nitto Denko Corp
- What technology area does this patent fall under?
- Primary CPC classification C09J7/385. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Nov 13 2025 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).