(19)
(11) EP 4 308 634 A1

(12)

(43) Date of publication:
24.01.2024 Bulletin 2024/04

(21) Application number: 21723037.4

(22) Date of filing: 18.03.2021
(51) International Patent Classification (IPC): 
C08J 5/18(2006.01)
B29C 55/06(2006.01)
 C08L 23/12(2006.01)
(52) Cooperative Patent Classification (CPC):
C08J 5/18; C08J 2323/12; C08J 2423/14; C08J 2423/16; B29C 55/005; B29C 55/065; C08L 23/14; C08L 2203/16; Y02E 60/10
 
C-Sets:
C08L 23/14, C08L 23/16;
(86) International application number:
PCT/US2021/023042
(87) International publication number:
WO 2022/197301 (22.09.2022 Gazette 2022/38)
(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
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(71) Applicant: DDP Specialty Electronic Materials US, LLC
Wilmington, DE 19805 (US)

(72) Inventors:
  • HUANG, Wenyi
    Midland, Michigan 48649 (US)
  • RIPMEESTER, William
    Kingston, Ontario K7P 2Z8 (CA)

(74) Representative: Abitz & Partner 
Arabellastraße 17
81925 München
81925 München (DE)

   


(54) POLYOLEFIN-BASED MICROPOROUS FILMS VIA SEQUENTIAL COLD AND HOT STRETCHING OF UNANNEALED POLYPROPYLENE COPOLYMER FILMS