Copolymer of vinylpyrrolidone, vinyl caprolactam and dimethylaminoethyl methacrylate (CAS RN 102972-64-5) in solid form, or as an aqueous solution containing by weight:
 
-27 % or more but not more than 33 % of copolymer,
 
-not more than 1,5 % of ethanol (CAS RN 64-17-5),
 
-not more than 1 % of preservatives
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