(19)

(11)

EP 0 439 579 A1

(12)

(43) Date of publication: 07.08.1991 Bulletin 1991/32 (21) Application number: 90912103.0 (22) Date of filing: 09.08.1990

(51) International Patent Classification (IPC):  A62D 1/ 06( . ) A62D 5/ 00( . ) A62D 1/ 00( . ) (86) International application number: PCT/US1990/004467 (87) International publication number: WO 1991/002564 (07.03.1991 Gazette 1991/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 21.08.1989 US 19890396841 21.11.1989 US 19890439738 (71) Applicant: Great Lakes Chemical Corporation West Lafayette, IN 47906 (US)	(72) Inventors: IIKUBO, Yuichi West Lafayette, IN 47906 (US) ROBIN, Mark, Lester West Lafayette, IN 47906 (US) (74) Representative: Bond, Bentley George, et al  HASELTINE LAKE & CO. Hazlitt House 28 Southampton Buildings Chancery Lane London, WC2A 1AT London, WC2A 1AT (GB)