C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/00 (2006.01) C25D 11/24 (2006.01)
Patent
CA 2390994
U.S. Patent 5,411,607 teaches that mid-temperature-range (76-93 ~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.
Le brevet U.S. Patent 5 411 607 stipule que l'étanchéification à température médiane (76-93·C) de l'aluminium anodisé peut s'effectuer efficacement sans aucun métal lourd, au moyen d'une composition d'étanchéification contenant des ions lithium (de préférence d'acétate de lithium) et des types particuliers de tensio-actifs anioniques produits par la sulfonation d'oxydes de diphényle à substitution alkyle ou de structures similaires. On a découvert que l'on peut considérablement améliorer de cette manière la résistance au jaunissement après exposition à la lumière ultraviolette, des surfaces ainsi étanchéifiées, ainsi que les tolérances du procédé d'étanchéification lui-même à la présence d'impuretés siliceuses et d'ions sulfate dans les compositions d'étanchéification, au moyen de deux types de tensioactifs, dont un à substituants alkyles contenant au plus 14, de préférence 12, atomes de carbone chacun, et un à substituant alkyle contenant au moins 15, de préférence 16, atomes de carbone.
Carlson Lawrence R.
Homma Nelson
Johnson Phillip M.
Henkel Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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