(19)

(11)

EP 0 643 738 A1

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(43) Date of publication: 22.03.1995 Bulletin 1995/12 (21) Application number: 93914370.0 (22) Date of filing: 02.06.1993

(51) International Patent Classification (IPC):  C08J 5/ 24( . ) C04B 35/ 83( . ) C01B 31/ 02( . ) C08J 5/ 04( . ) (86) International application number: PCT/US1993/005303 (87) International publication number: WO 1993/024558 (09.12.1993 Gazette 1993/29)

(84) Designated Contracting States: BE DE FR GB IT NL (30) Priority: 04.06.1992 US 19920894325 (71) Applicant: THE DOW CHEMICAL COMPANY Midland, Michigan 48640 (US)	(72) Inventors: PIERINI, Peter, E. Berkeley, CA 94705 (US) WESSLING, Ritchie, A. Berkeley, CA 94707 (US) NIELSEN, Charles, A. Walnut Creek, CA 94596 (US) (74) Representative: Sternagel, Hans-Günther, Dr., et al  Patentanwälte Dr. Michael Hann Dr. H.-G. Sternagel Sander Aue 30 D-51465 Bergisch Gladbach D-51465 Bergisch Gladbach (DE)