| abstract |
The invention provides a firm, low smear, ultra mild, weakly acidic skin pH (4.8-6.0) personal cleansing freezer bar comprising by weight of said bar: a sum total of from about 10% to about 50% of essentially free carboxylic acid, preferably myristic acid, behenic acid, or 12-hydroxy stearic acid; from about 15% to about 65% of a water-soluble organic anionic and/or nonionic bar firmness aid, preferably sodium cocoyl isethionate or sodium lauroyl isethionate; and from about 15% to about 40% water. The skin pH freezer bar is made by the following process steps: I. mixing a molten (170 DEG -205 DEG F.; 76 DEG -96 DEG C.) mixture comprising said essentially free carboxylic acid; water; and bar firmness aid; II. cooling said mixture to a semi-solid in a scraped wall heat exchanger freezer at a cooled temperature of 110 DEG -195 DEG F. (43 DEG -91 DEG C.); III. extruding said semi-solid as a soft plug; and further cooling and crystallizing said soft plug until firm to provide said skin pH personal cleansing freezer bar. The firm, low smear, ultra mild freezer bar has a shallow 25 DEG C. penetration value of from zero up to 12 mm. |