(19)
(11) EP 0 608 642 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.04.1995 Bulletin 1995/16

(43) Date of publication A2:
03.08.1994 Bulletin 1994/31

(21) Application number: 93310633.8

(22) Date of filing: 31.12.1993
(51) International Patent Classification (IPC)5: C11D 3/10, C11D 3/33
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE

(30) Priority: 31.12.1992 GB 9227155

(71) Applicant: RHONE-POULENC CHEMICALS LIMITED
Watford, Herts WD1 1QM (GB)

(72) Inventors:
  • Tournilhac, Florence
    F-75011 Paris (FR)
  • Hopwood, Mark
    Hethersett, Norwich NR9 3DR (GB)
  • Carr, John Federick
    Gloucester GL1 5NT (GB)

(74) Representative: Woods, Geoffrey Corlett et al
J.A. KEMP & CO. 14 South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Inhibiting calcium carbonate crystal growth


    (57) N,N-dicarboxymethyl-2-aminopentane-1,5-dioic acid or a salt thereof is useful as CaCO₃ crystal growth inhibitor, especially in detergent compositions.





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