EP 1257685 A1 20021120 - COMPOSITION AND PROCESS FOR SEALING ANODIZED ALUMINUM
Title (en)
COMPOSITION AND PROCESS FOR SEALING ANODIZED ALUMINUM
Title (de)
ZUSAMMENSETZUNG UND VERFAHREN ZUM VERSIEGELN VON ANODISIERTETEM ALUMINIUM
Title (fr)
COMPOSITION ET PROCEDE D'ETANCHEIFICATION D'ALUMINIUM ANODISE
Publication
Application
Priority
- US 0030840 W 20001109
- US 16435199 P 19991109
Abstract (en)
[origin: WO0134872A1] U.S. Patent 5,411,607 teaches that mid-temperature-range (76-93 DEG C) sealing of anodized aluminum can be accomplished effectively without any heavy metals, using a sealing composition that contains lithium cations (preferably from lithium acetate) and particular types of anionic surfactants made by sulfonating alkyl substituted diphenyl oxides or similar structures. It has now been found that the resistance of surfaces sealed in this way to yellowing after exposure to ultraviolet light and the tolerances of the sealing process itself for the presence of silicaceous impurities and sulfate ions in the sealing compositions can be considerably improved by using two kinds of these surfactants, one with alkyl substituents that contain 14 or fewer, preferably 12, carbon atomes each and one with alkyl substituents that contain 15 or more, preferably 16, carbon atoms each.
IPC 1-7
IPC 8 full level
C25D 11/24 (2006.01)
CPC (source: EP)
C25D 11/246 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL
DOCDB simple family (publication)
WO 0134872 A1 20010517; AU 1656101 A 20010606; CA 2390994 A1 20010517; EP 1257685 A1 20021120; EP 1257685 A4 20060906
DOCDB simple family (application)
US 0030840 W 20001109; AU 1656101 A 20001109; CA 2390994 A 20001109; EP 00979151 A 20001109