(19)

(11)

EP 1 109 758 A1

(12)

(43) Date of publication: 27.06.2001 Bulletin 2001/26 (21) Application number: 99928831.9 (22) Date of filing: 21.06.1999

(51) International Patent Classification (IPC)7: C04B 35/628, C04B 35/468, H01G 4/12 (86) International application number: PCT/US9913/980 (87) International publication number: WO 9967/189 (29.12.1999 Gazette 1999/52)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 23.06.1998 US 90408 P 14.08.1998 US 96668 P (71) Applicant: CABOT CORPORATION Boston, Massachusetts 02210-2019 (US)	(72) Inventors: MILLER, David, V. Macungie, PA 18062 (US) VENIGALLA, Sridhar Macungie, PA 18062 (US) CLANCY, Donald, J. Pottstown, PA 19464 (US) (74) Representative: Trueman, Lucy Petra  Barker Brettell,138 Hagley Road,Edgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)