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(11)

EP 0 963 345 A1

(12)

(43) Date of publication: 15.12.1999 Bulletin 1999/50 (21) Application number: 98908610.0 (22) Date of filing: 18.02.1998

(51) International Patent Classification (IPC):  C01B 33/ 159( . ) C09C 1/ 30( . ) C01B 33/ 16( . ) (86) International application number: PCT/US1998/003273 (87) International publication number: WO 1998/037020 (27.08.1998 Gazette 1998/34)

(84) Designated Contracting States: BE DE ES FR GB IT (30) Priority: 24.02.1997 US 19970806005 (71) Applicant: DOW CORNING CORPORATION Auburn, MI 48611 (US)	(72) Inventors: BURNS, Gary, T. Midland, MI 48642 (US) HAHN, James, R. Midland, MI 48640 (US) LENTZ, Charles, W. Midland, MI 48642 (US) REESE, Clifford, C. Midland, MI 48642 (US) (74) Representative: Patentanwälte Sternagel & Fleischer  Braunsberger Feld 29 51429 Bergisch Gladbach 51429 Bergisch Gladbach (DE)