Patent SG-11201811106V-A (SG)
Title: Polyethylene for pipes
Inventor: DRENG TORE
IPC: C08F210/16
Filed: 2017-06-29
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 04 January 2018 (04.01.2018) W I PO I PCT onion OH oI0IIIIIIII11010111HDIDurnoff ow (10) International Publication Number WO 2018/002617 Al (51) International Patent Classification: C08F 210/16 (2006.01) C08F 4/6592 (2006.01) CO8F 2/00 (2006.01) (21) International Application Number: PCT/GB2017/051892 (22) International Filing Date: 29 June 2017 (29.06.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 1611295.5 29 June 2016 (29.06.2016) GB (71) Applicant: NORNER VERDANDI AS [NO/NO]; Asdal- strand 291, 3960 Stathelle (NO). (71) Applicant (for SD only): GORDON, Kirsteen [GB/GB]; c/ o Marks & Clerk LLP, 62-68 Hills Road, Cambridge Cam- bridgeshire CB2 1LA (GB). (72) Inventors: DRENG, Tore; Asdalstrand 291, 3960 Stathelle (NO). LUNDQUIST, Morten; Asdalstrand 291, 3960 Stathelle (NO). LINDROOS, Jarmo; Asdalstrand 291, 3960 Stathelle (NO). O'HARE, Dermot; Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford Oxfordshire OX1 3TA (GB). BUFFET, Jean-Charles; Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford Oxfordshire OX1 3TA (GB). TURNER, Zoe; Chemistry Research Laborato- ry, University of Oxford, 12 Mansfield Road, Oxford Ox- fordshire OX1 3TA (GB). FRASER, Duncan; Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford Oxfordshire OX1 3TA (GB). OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: with international search report (Art. 21(3)) before the expiration of the time limit for amending the claims and to be republished in the event of receipt of amendments (Rule 48.2(h)) = (74) Agent: MARKS & CLERK LLP; 62-68 Hills Road, Cam- bridge Cambridgeshire CB2 1LA (GB). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, (54) Title: POLYETHYLENE FOR PIPES (57) : The present invention provides a process for the preparation of a multimodal polyethylene, said multimodal polyethylene preferably having a bimodal or trimodal molecular weight distribution, comprising: (i) polymerising ethylene and optionally an a- olefin comonomer in a first polymerisation stage to produce a first ethylene polymer; and (ii) polymerising ethylene and optionally an a-olefin comonomer, in the presence of said first ethylene polymer, in a second polymerisation stage, wherein said first and second polymerisation stages are carried out in the presence of an unsupported metallocene catalyst, which is a complex of a group 4 to 10 metal having at least two ligands, wherein at least one of the ligands is persubstituted and comprises a delocalised pi system of electrons, each polymerisation stage produces at least 5 %wt of said multimodal polyethylene, and said multimodal polyethylene has a multimodal 3 molecular weight distribution, a molecular weight of at least 50,000 g/mol and a bulk density of at least 250 g/dm .