Global Patent Index - EP 0971049 A1

EP 0971049 A1 2000-01-12 - Methods of inhibiting corrosion using halo-benzotriazoles

Title (en)

Methods of inhibiting corrosion using halo-benzotriazoles

Title (de)

Verfahren zur Korrosionsinhibierung unter Verwendung von Halo-Benzotriazole

Title (fr)

Procédés d'inhibition de la corrosion utilisant des halo-benzotriazoles

Publication

EP 0971049 A1 (EN)

Application

EP 98304911 A

Priority

EP 98304911 A

Abstract (en)

The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Halo-benzotriazoles such as chloro-tolyltriazole and bromo-tolyltriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.

IPC 1-7 (main, further and additional classification)

C23F 11/08; C23F 11/10

IPC 8 full level (invention and additional information)

C23F 11/08 (2006.01); C23F 11/10 (2006.01)

CPC (invention and additional information)

C23F 11/08 (2013.01); C23F 11/10 (2013.01)

Citation (search report)

  • [X] WO 9629449 A1 19960926 - BETZ LABORATORIES [US]
  • [X] US 4184991 A 19800122 - SCHEURMAN CLARENCE III [US]
  • [X] EP 0478247 A2 19920401 - CALGON CORP [US]
  • [X] EP 0481667 A2 19920422 - CALGON CORP [US]
  • [A] US 5503775 A 19960402 - RAO NARASIMHA M [US], et al
  • [A] DATABASE WPI Section Ch Week 7417, Derwent Publications Ltd., London, GB; Class E13, AN 74-31998V, XP002083198
  • [A] ZAK E.G.: "The Mechanism of the protective action of halogen derivatives of benzotriazole in preventing the corrosion of metals", WERKSTOFFE UND KORROSION., vol. 30, no. 10, WEINHEIM DE, pages 740 - 741, XP002083292
  • [AD] HOLLANDER O ET AL: "THE CHEMISTRY OF AZOLE COPPER CORROSION INHIBITORS IN COOLING WATER", CORROSION, vol. 41, no. 1, 1 January 1985 (1985-01-01), pages 39 - 45, XP002008378
  • [AD] LU F ET AL: "EFFECT OF HALOGENATION ON YELLOW METAL CORROSION: INHIBITION BY TRIAZOLES", CORROSION, vol. 50, no. 6, 1 June 1994 (1994-06-01), pages 422 - 431, XP000457454

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE

EPO simple patent family

EP 0971049 A1 20000112

INPADOC legal status


2007-01-03 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20060510

2001-03-14 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE

2000-10-25 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000911

2000-09-20 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE

2000-08-23 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000626

2000-01-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE

2000-01-12 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI