(19)

(11)

EP 0 632 840 A1

(12)

(43) Date of publication: 11.01.1995 Bulletin 1995/02 (21) Application number: 93906600.0 (22) Date of filing: 24.03.1993

(51) International Patent Classification (IPC):  C14C 9/ 00( . ) (86) International application number: PCT/EP1993/000711 (87) International publication number: WO 1993/020243 (14.10.1993 Gazette 1993/25)

(84) Designated Contracting States: AT BE DE DK FR GB IE IT LU MC NL PT SE (30) Priority: 27.03.1992 GB 19920006791 (71) Applicant: EXXON CHEMICAL PATENTS INC. Florham Park New Jersey 07932 (US)	(72) Inventor: MANZO, Giovanni I-80041 Naples (IT) (74) Representative: Bawden, Peter Charles, et al  EXXON CHEMICAL LIMITED Exxon Chemical Technology Centre PO Box 1 Abingdon Oxfordshire OX13 6BB Abingdon Oxfordshire OX13 6BB (GB)