(19)
(11) EP 4 223 799 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
24.01.2024 Bulletin 2024/04

(43) Date of publication:
09.08.2023 Bulletin 2023/32

(21) Application number: 21875822.5

(22) Date of filing: 30.09.2021
(51) International Patent Classification (IPC): 
C08F 14/18(2006.01)
B32B 27/30(2006.01)
F16L 11/04(2006.01)
 B32B 1/08(2006.01)
C08F 214/18(2006.01)
(52) Cooperative Patent Classification (CPC):
F16L 11/04; C08F 214/265; C08F 214/262; B32B 27/08; B32B 2250/24; B32B 1/08; B32B 2597/00; B32B 27/322; B32B 27/34; B32B 27/306
 
C-Sets:
  1. C08F 214/262, C08F 214/24, C08F 216/1408;
  2. C08F 214/265, C08F 210/02, C08F 214/182, C08F 214/28;
  3. C08F 214/265, C08F 210/02, C08F 214/182;
(86) International application number:
PCT/JP2021/036297
(87) International publication number:
WO 2022/071526 (07.04.2022 Gazette 2022/14)
(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 MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 30.09.2020 JP 2020166480

(71) Applicant: Daikin Industries, Ltd.
Osaka-shi, Osaka 530-0001 (JP)

(72) Inventors:
  • KUWAJIMA, Yuuki
    Osaka-shi Osaka 530-0001 (JP)
  • KAMIYA, Yukinori
    Osaka-shi Osaka 530-0001 (JP)

(74) Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)

   


(54) FLUORORESIN, MULTILAYER PRODUCT, AND TUBE


(57) Provided is a fluororesin having a tensile strength retention ratio of 50% or more, the tensile strength retention ratio being calculated by the following formula from the tensile strength of the fluororesin after a heat treatment obtained by conducting a heat treatment at 130°C for 40,000 hours, and the tensile strength of the fluororesin before the heat treatment.