(19)

(11)

EP 0 638 100 A1

(12)

(43) Date of publication: 15.02.1995 Bulletin 1995/07 (21) Application number: 93907275.0 (22) Date of filing: 09.03.1993

(51) International Patent Classification (IPC):  C03C 25/ 24( . ) C03C 25/ 10( . ) C04B 41/ 83( . ) C08F 299/ 06( . ) C08G 18/ 67( . ) C03C 17/ 32( . ) C04B 41/ 48( . ) C08F 290/ 00( . ) C08G 18/ 48( . ) G02B 6/ 44( . ) (86) International application number: PCT/US1993/002037 (87) International publication number: WO 1993/021248 (28.10.1993 Gazette 1993/26)

(84) Designated Contracting States: BE DE FR GB IT NL SE (30) Priority: 20.04.1992 JP 19920099596 (71) Applicant: DSM DESOTECH, INC. Elgin, IL 60120 (US)	(72) Inventors: OHTAKA, Tohru Kawasaki City, Kanagawa 215 (JP) IWANAGA, Shinichirou, JSR Apartment 14-101 Yokkaichi City, Mie 510 (JP) WATANABE, Tsuyoshi Hattiesburg, MS 39401 (US) IGARASHI, Katutoshi, JSR Apartment 2-201 Yokohama City, Kanagawa 227 (JP) (74) Representative: Kleiborn, Paul Erik, et al  Octrooibureau DSM P.O. Box 9 NL-6160 MA Geleen NL-6160 MA Geleen (NL)