| (19) |
 |
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(11) |
EP 0 909 809 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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21.07.1999 Bulletin 1999/29 |
| (43) |
Date of publication A2: |
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21.04.1999 Bulletin 1999/16 |
| (22) |
Date of filing: 30.09.1998 |
|
| (51) |
International Patent Classification (IPC)6: C11D 3/395 |
|
| (84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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Designated Extension States: |
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AL LT LV MK RO SI |
| (30) |
Priority: |
01.10.1997 EP 97203019
|
| (71) |
Applicants: |
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- UNILEVER PLC
London EC4P 4BQ (GB)
GB IE CY
- UNILEVER N.V.
3013 AL Rotterdam (NL)
BE CH DE DK ES FI FR GR IT LI LU MC NL PT SE AT
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| (72) |
Inventors: |
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- Beers, Olaf Cornelis Petrus
3133 AT Vlaardingen (NL)
- Gribnau, Michiel Carolus Maria
3133 AT Vlaardingen (NL)
- Hage, Ronald
3133 AT Vlaardingen (NL)
- Hermant, Roelant Mathijs
3133 AT Vlaardingen (NL)
- Kalmeijer, Robertus Everardus
3133 AT Vlaardingen (NL)
- Koek, Jean Hypolites
3133 AT Vlaardingen (NL)
- Lamers, Christiaan
3133 AT Vlaardingen (NL)
- Russell, Stephen William
3133 AT Vlaardingen (NL)
- Twisker, Robin Stefan
3133 AT Vlaardingen (NL)
- Feringa, Bernard Lucas
9747 AG Groningen (NL)
- Roelfes, Johannes Gerhardus
9747 AG Groningen (NL)
|
| (74) |
Representative: Elliott, Peter William et al |
|
Unilever plc
Patent Division
Colworth House
Sharnbrook
Bedford MK44 1LQ
Bedford MK44 1LQ (GB) |
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| |
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(57) A bleach and oxidation catalyst is provided comprising a catalytically active iron
complex including a defined pentadentate nitrogen containing ligand. This type of
iron complex can activate hydrogen peroxide or peroxy acids and was found to have
favourable stain removal and remarkable dye transfer inhibition properties. In addition,
a considerably improved stability of these iron complex compounds in alkaline aqueous
environment has been obtained, in particular at the peroxy compound concentrations
generally present in the fabric washing liquor.