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(11)

EP 2 834 281 A1

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(43) Date of publication: 11.02.2015 Bulletin 2015/07 (21) Application number: 13716647.6 (22) Date of filing: 28.03.2013

(51) International Patent Classification (IPC):  C08F 210/16(2006.01) C08F 4/659(2006.01) C08F 4/639(2006.01) C08F 10/00(2006.01) C08F 4/6592(2006.01) C08F 4/6392(2006.01) (86) International application number: PCT/US2013/034373 (87) International publication number: WO 2013/151863 (10.10.2013 Gazette 2013/41)

(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 (30) Priority: 02.04.2012 US 201213437277 (71) Applicant: Chevron Phillips Chemical Company LP The Woodlands, Texas 77380 (US)	(72) Inventors: BUCK, Richard M Bartlesville, Oklahoma 74006 (US) YANG, Qing Bartlesville, Oklahoma 74006 (US) MASINO, Albert P Tulsa, Oklahoma 74137 (US) WITTNER, Christopher E Bartlesville, Oklahoma 74006 (US) (74) Representative: Potter Clarkson LLP  The Belgrave Centre Talbot Street Nottingham, NG1 5GG Nottingham, NG1 5GG (GB)