| (19) |
 |
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(11) |
EP 4 324 979 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.06.2024 Bulletin 2024/26 |
| (43) |
Date of publication A2: |
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21.02.2024 Bulletin 2024/08 |
| (22) |
Date of filing: 10.08.2023 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT
NL NO PL PT RO RS SE SI SK SM TR |
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Designated Extension States: |
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BA |
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Designated Validation States: |
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KH MA MD TN |
| (30) |
Priority: |
12.08.2022 JP 2022129075
|
| (71) |
Applicant: Asahi Kasei Kabushiki Kaisha |
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Tokyo 1000006 (JP) |
|
| (72) |
Inventors: |
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- Kawai, Kazuya
Tokyo, 100-0006 (JP)
- Hatanaka, Aki
Tokyo, 100-0006 (JP)
- Sakata, Keiichiro
Japan, 100-0006 (JP)
- Yamaguchi, Hidehiro
Tokyo, 100-0006 (JP)
|
| (74) |
Representative: dompatent von Kreisler Selting Werner -
Partnerschaft von Patent- und Rechtsanwälten mbB |
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Deichmannhaus am Dom
Bahnhofsvorplatz 1
50667 Köln
50667 Köln (DE) |
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| |
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(57) Provided is artificial leather which has excellent clarity of emboss patterns, and
which does not use organic solvents during the production process and thus has a low
environmental impact. The artificial leather comprises a nonwoven fabric made of ultrafine
fibers having a mean single fiber diameter of 0.3 µm to 7 µm, and water-dispersed
polyurethane, wherein when the free induction decay (FID) signal in pulse NMR (solid
echo method, proton observation, measuring temperature: 50°C) is fitted to two components:
the S component (Gaussian component) and L component (Lorentz component), the spin-spin
relaxation time Tl of the L component is 500 µsec to 800 µsec and the L component
fraction Cl is 25% or greater and less than 55%.