(19)

(11)

EP 0 324 833 A1

(12)

(43) Date of publication: 26.07.1989 Bulletin 1989/30 (21) Application number: 88906517.0 (22) Date of filing: 06.07.1988

(51) International Patent Classification (IPC):  B03D 1/ 014( . ) B03D 1/ 06( . ) B03D 1/ 02( . ) (86) International application number: PCT/US1988/002283 (87) International publication number: WO 1989/000457 (26.01.1989 Gazette 1989/03)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 14.07.1987 US 19870072809 (71) Applicant: The Lubrizol Corporation Wickliffe, Ohio 44092 (US)	(72) Inventors: CLARK, Alan, Curtis Mentor, OH 44060 (US) RICHARDS, Edward, Peter Chagrin Falls, OH 44022 (US) SHAW, Douglas, Raymond Lakewood, CO 80215 (US) (74) Representative: Crisp, David Norman, et al  D. YOUNG & CO. 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)