C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/52 (2006.01) C02F 1/66 (2006.01) G03F 7/30 (2006.01) G03F 7/42 (2006.01)
Patent
CA 2081135
The use of aluminum sulfate to neutralize alkaline solu- tions yields a gelatinous precipitate. When neutralization of the solution causes other materials to precipitate along with the gel, filtration of the precipitated materials is very difficult because of the gel. The addition of water soluble magnesium, aluminum, and/or calcium salts as primary neutral- izing agents for an alkaline stripper solution of a photoresin, followed by the acidification of the resulting slurry to a pH of from about 2 to about 4 gives a slurry of the precipitated resin which may be filtered quickly.
'utilisation de sulfate d'aluminium pour neutraliser des solutions alcalines produit un précipité gélatineux. Lorsque la neutralisation de la solution entraîne la précipitation d'autres matières avec le gel, celui-ci rend le filtrage de ces matières très difficile. L'ajout de sels de magnésium, d'aluminium et(ou) de calcium solubles dans l'eau comme agents primaires pour neutraliser une solution alcaline de décapage d'une photorésine, suivi par l'acidification de la boue liquide résultante jusqu'à un pH compris entre environ 2 et 4, transforme en une boue liquide la résine précipitée qui peut être filtrée rapidement.
Gowling Lafleur Henderson Llp
Rohm And Haas Chemicals Llc
LandOfFree
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