(19)

(11)

EP 4 638 638 A1

(12)

(43) Date of publication: 29.10.2025 Bulletin 2025/44 (21) Application number: 23836945.8 (22) Date of filing: 13.12.2023

(51) International Patent Classification (IPC):  C09K 8/52(2006.01) C09K 8/60(2006.01) C11D 1/06(2006.01) C11D 1/74(2006.01) C11D 3/00(2006.01) E21B 43/12(2006.01) C09K 8/524(2006.01) C11D 1/825(2006.01) C11D 1/66(2006.01) C11D 1/83(2006.01) C09K 8/94(2006.01) E21B 43/16(2006.01) (52) Cooperative Patent Classification (CPC): C11D 1/83; C11D 1/825; C11D 1/662; C11D 1/74; C11D 1/06; C11D 3/0094; C09K 8/94; C09K 8/602; C09K 8/52; C09K 8/524; C09K 2208/32; C09K 8/605; E21B 43/13 (86) International application number: PCT/IB2023/062607 (87) International publication number: WO 2024/134373 (27.06.2024 Gazette 2024/26)

(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: 20.12.2022 IT 202200025998 (71) Applicant: Chimec S.p.A. 00144 Roma (IT)

(72) Inventors: BRUNO, Massimo 00071 Pomezia RM (IT) ZOCCARATO, Tatiana 00040 Lanuvio (IT) CIARDI, Umberto 03025 Monte San Giovanni Campano FR (IT) VOLPONI, Andrea 00132 Rome (IT) BANCONE, Michele 00040 Ariccia RM (IT) MANTARRO, Milena 00128 Rome (IT) QUARANTA, Andrea 04011 Aprilia (IT) (74) Representative: Montemurro, Riccardo et al Società Italiana Brevetti S.p.A. Piazza di Pietra, 39 00186 Roma 00186 Roma (IT)