Delivery of hydrophobic benefit agents from bodywashes and the like onto a keratinous substrate

A cosmetically acceptable delivery system for hydrophobic benefit agents to a keratinous substrate wherein the delivery system comprises

• i.) an amphiphilic block copolymer,
• which amphiphilic block copolymer comprises a hydrophilic (A) block and a hydrophobic (B) block,
• wherein the hydrophilic block (A) comprises at least a cationic monomer unit or a potentially cationic monomer unit in the conditions of use and the unit is represented by formulae (I) or (II)
• wherein R1 is hydrogen or methyl,
• R2 is hydrogen, a branched or unbranched C1-4 alkyl,
• R3 and/or R4 are independently branched or unbranched C1-22 alkyl, C1-C4 alkylhydroxy, benzyl
• or
• R3 and R4 can be combined to form a five or six membered ring with the nitrogen,
• said ring containing one or more hetero atoms,
• Z− is the conjugate base of an acid,
• X is oxygen or —NR5,
• wherein R5 is as defined in R1 above,
• A is an alkylene group of 1 to 4 carbons,
• R6 and R7 are hydrogen, branched or unbranched C1-22 alkyl, benzyl or C1-C4 alkylhydroxy,
• n and m are 2, 3, 4 or greater;
• and
• the hydrophobic polymeric block (B) comprises siloxane monomer units,
• and
• ii.) a hydrophobic benefit agent.