| 摘要 |
Hair-fixing compositions comprise as film-forming substance a polyvinyl acetal the 5% butanol solution of which has a viscosity of less than 50 centipoises and which has so high a content of hydroxyl groups that it has only a limited capacity for absorbing water but is nevertheless soluble or dispersible in dilute aqueous solutions of wetting agents, i.e. shampoos. Specified acetals are those of acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, caproaldehyde and caprylaldehyde. Minor proportions of residual acylate, e.g. acetate, groups and acetal groups derived from higher aldehydes may be present. Specified solvents are ethanol and isopropanol, and the compositions may also comprise wetting agents, softening agents, perfumes, dyes and propellants, e.g. trichlorofluoromethane, dichlorodifluoromethane and dichlorotetrafluoroethane. Examples describe compositions comprising perfume and a propellant and (1) polyvinyl butyral, alcohol-soluble lanoline and isopropanol; (2) polyvinyl acetal, isopropanol and methylene chloride; and (3) polyvinyl butyral, ethanol and methylene chloride.ALSO:A method of fixing hair comprises spraying on to the hair a solution containing, as film forming substance, a polyvinyl acetal, the 5% butanol solution of which has a viscosity of less than 50 centipoises and which has so high a content of hydroxyl groups that it has only a limited capacity for absorbing water but is soluble or dispersible in dilute aqueous solutions of wetting agents, i.e. in shampoos. The glossy films obtained remain unchanged by humid atmospheres, are undamaged by combing and minimize electrostatic charging. Specified acetals are those of acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, caproaldehyde and caprylaldehyde. Minor proportions of residual acylate groups, e.g. acetate groups, and acetal groups derived from higher aldehydes may be present. Specified solvents are ethanol and isopropanol, and the compositions may also comprise wetting agents, softening agents, perfumes, dyes and propellants, e.g. trichlorofluoromethane, dichlorodifluoromethane and dichlorotetrafluoroethane. Examples describe spraying hair with compositions comprising perfume and a propellant and (1) polyvinyl butyral, alcoholsoluble lanoline and isopropanol; (2) polyvinyl acetal, isopropanol and methylene chloride; and (3) polyvinyl butyral, ethanol and methylene chloride. |
