| (19) |
 |
|
(11) |
EP 4 321 679 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
19.06.2024 Bulletin 2024/25 |
| (43) |
Date of publication A2: |
|
14.02.2024 Bulletin 2024/07 |
| (22) |
Date of filing: 09.08.2023 |
|
| (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 |
|
Designated Extension States: |
|
BA |
|
Designated Validation States: |
|
KH MA MD TN |
| (30) |
Priority: |
12.08.2022 JP 2022129024
|
| (71) |
Applicant: Asahi Kasei Kabushiki Kaisha |
|
Tokyo 1000006 (JP) |
|
| (72) |
Inventors: |
|
- 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 |
|
Deichmannhaus am Dom
Bahnhofsvorplatz 1
50667 Köln
50667 Köln (DE) |
|
| |
|
(57) Provided is artificial leather which does not use organic solvents during the production
process and thus has a low environmental impact, and which has no formation of wrinkles
during three-dimensional molding. 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-dispersible 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 55% to 75%.