(19)

(11)

EP 0 412 122 A1

(12)

(43) Date of publication: 13.02.1991 Bulletin 1991/07 (21) Application number: 89906656.0 (22) Date of filing: 27.04.1989

(51) International Patent Classification (IPC):  C04B 35/ 04( . ) C04B 35/ 043( . ) C04B 35/ 48( . ) B28B 3/ 02( . ) C04B 35/ 053( . ) C04B 35/ 486( . ) (86) International application number: PCT/US1989/001769 (87) International publication number: WO 1989/010337 (02.11.1989 Gazette 1989/26)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 29.04.1988 US 19880188402 (71) Applicant: THE DOW CHEMICAL COMPANY Midland, Michigan 48641-1967 (US)	(72) Inventors: SRINIVASAN, Gajawalli, V. Salt Lake City, UT 84102 (US) VIRKAR, Anil V. Salt Lake City, UT 84106 (US) (74) Representative: Raynor, John, et al  W.H. Beck, Greener & Co 7 Stone Buildings Lincoln's Inn London WC2A 3SZ London WC2A 3SZ (GB)