Cosmetic composition containing a polycondensate

A hair lacquer composition consisting essentially of a solution in an alcohol selected from the group consisting of ethanol and isopropanol, of from 0.2 to 8 percent by weight of a polycondensate having units of the formula ##STR14## wherein t is 0 or 1, and

• when t=1, R.sub.1 and R'.sub.1 each independently represent linear or branched alkylene having 1-38 carbon atoms;
• linear or branched alkylene having 1-38 carbon atoms and interrupted by --CONH-- or --CO--;
• alkenyl or alkynyl having 2-18 carbon atoms;
• cycloalkylene having 5-6 carbon atoms;
• 1,4-dimethylene cyclohexane;
• phenylene;
• xylylene;
• diphenylene;
• diphenylene methane;
• 2,2-diphenylene propane;
• or a divalent radical of the formula
• --CHR'--O--C.sub.2 H.sub.3 (R')O].sub.n HCR'--
• wherein n is 0-20 and R' represents hydrogen or methyl, and
• R.sub.2, R'.sub.2, R.sub.3 and R'.sub.3 each independently represent --COOR.sub.4, --CN, --CONH.sub.2 or --COCH.sub.3, wherein R.sub.4 represents hydrogen, linear or branched alkyl having 1-18 carbon atoms or cycloalkyl having 5-6 carbon atoms,
• said alcohol being present in an amount from 6 to 30 weight percent and the remainder of said composition being a liquefied gaseous propellant under pressure, said propellant being selected from the group consisting of dichlorodifluoromethane, trichlorofluoromethane, nitrous oxide, CO.sub.2 and a mixture thereof.