To prepare a nonhalogen-based treating liq. for removing a coating material which can chemically separate and remove a coating film of an aluminum can and in particular does not use a halogen-based solvent.
This treating liq. for removing a coating material on an aluminum can comprise, based on the total amt. of treating liq. for removing a coating material, 5 to 40wt.% alkyl arylsulfonic acid and 5 to 30wt.% water and the balance consisting of a glycol ether solvent. Addition of 1 to 50wt.% nonhalogen-based org. solvent, other than the glycol ether, or benzophenone to the above treating liq. can improve the penetration of the glycol ether solvent into the coating film. Use of benzophenone can reduce emission of odor. Further, addition of the nonionic surfactant in an amt. up to 10wt.% can further improve the penetration of the glycol ether solvent and sulfonic acid into the coating film.
SAKA KAZUKO
HANZAWA YASUO
RASA IND LTD
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