(19)
(11)EP 0 252 007 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
05.07.1989 Bulletin 1989/27

(43)Date of publication A2:
07.01.1988 Bulletin 1988/01

(21)Application number: 87810352.2

(22)Date of filing:  22.06.1987
(51)International Patent Classification (IPC)4C10M 133/08, C07C 93/06, C10M 169/04
(84)Designated Contracting States:
BE DE ES FR GB IT

(30)Priority: 28.06.1986 GB 8615866
13.12.1986 GB 8629834

(71)Applicant: CIBA-GEIGY AG
4002 Basel (CH)

(72)Inventors:
  • O'Neil, Robert Montgomery, Dr.
    Manchester M31 2UA (GB)
  • Payne, John David, Dr.
    Manchester M20 8BU (GB)


(56)References cited: : 
  
      


    (54)2-Propanol derivatives as corrosion inhibitors


    (57) New composition comprises a functional fluid in contact with ferrous metal and a corrosion inhibiting amount of at least one compound of formula (I)

    or a derivative thereof in which R1, R2 and R3 are, independently, hydrogen, a C1 -C15 straight or branched chain alkyl residue, a C5 -C12 cycloalkyl residue, a C6 -C15 aryl residue or C7 -C12 alkaryl residue, and R4 and R5 are, independently, hydrogen, 2-hydroxyethyl or 2-hydroxypropyl with the provisos that a) R4 and R5 are not simultaneously hydrogen,

    b) when R4 and R5 are each -CH2 -CH2 -OH, R1 and R2 are not simultaneously hydrogen and R3 is not a pentyl residue and

    c) that polyalkylene phenol or polycarboxylic ester co-additives are absent:


    as well as salts thereof. Some of the compounds of formula I are new.





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