Controlled release compositions

Abstract

A composition for controlled release of an active material such as a fragrance, sunscreen, vitamin or biocide in a product such as a hair shampoo, shower gel, another personal product such as an antiperspirant or deodorant, a household cleaning product such as a laundry detergent, hard surface cleaner or polishes, or a fabric softener, air freshener or tumble drier sheet, comprises a blend of the active material and a waxy cyclopolysiloxane. The cyclopolysiloxane is preferably substituted by hydrocarbon substituents having 12 or more carbon atoms and may also contain an aryl or aralkyl substituent.

1 . A process for controlling the release of an active material, selected from fragrances, sunscreens, vitamins, drugs, biocides, pest repellents, catalysts and cooling agents, from a cleaning composition, personal care product, household care product or textile treatment composition by blending the active material and a waxy silicone material before adding the active material to the cleaning composition, personal care product, household care product or textile treatment composition, characterized in that the waxy silicone material has a melting point 10-200° C., that the waxy silicone material comprises a cyclopolysiloxane in which at least 20 percent of the silicon atoms in the cyclopolysiloxane have an alkyl substituent having 16 to 100 carbon atoms, and that 10 to 80 percent of the silicon atoms of the cyclopolysiloxane have a silicon-bonded substituent of the formula X-Ph, wherein X denotes a divalent aliphatic organic group bonded to silicon through a carbon atom and Ph denotes an aromatic group.  
   
   
       2 . A process according to claim  17  in which 50-80 percent of the silicon atoms in the cyclopolysiloxane have an alkyl substituent having 16 to 100 carbon atoms, and 20 to 50 percent of the silicon atoms of the cyclopolysiloxane have a silicon-bonded substituent of the formula X-Ph.  
   
   
       3 . A composition for controlling the release of an active material, selected from fragrances, sunscreens, vitamins, drugs, biocides, pest repellents, catalysts and cooling agents, from a cleaning composition, personal care product, household care product or textile treatment composition, comprising a blend of the active material and a waxy silicone material, characterized in that the blend of active material and waxy silicone material is in particulate or emulsion form, that the waxy silicone material has a melting point 10-200° C., that the waxy silicone material comprises a cyclopolysiloxane in which at least 20 percent of the silicon atoms in the cyclopolysiloxane have an alkyl substituent having 16 to 100 carbon atoms, and that 10 to 80 percent of the silicon atoms of the cyclopolysiloxane have a silicon-bonded substituent of the formula X-Ph, wherein X denotes a divalent aliphatic organic group bonded to silicon through a carbon atom and Ph denotes an aromatic group.  
   
   
       4 . A composition according to claim  19  in which 50-80 percent of the silicon atoms in the cyclopolysiloxane have an alkyl substituent having 16 to 100 carbon atoms and 20 to 50 percent of the silicon atoms of the cyclopolysiloxane have a silicon-bonded substituent of the formula X-Ph.  
   
   
       5 . A composition according to claim  19 , characterized in that the blend of active material and waxy cyclopolysiloxane is present as the disperse phase of an oil-in-water emulsion.  
   
   
       6 . A composition according to claim  19 , characterized in that the emulsifying surfactant of the said oil-in-water emulsion comprises a cationic surfactant a cationic surfactant comprising a quaternary ammonium material containing at least one ester linking group in the quaternary ammonium molecule.  
   
   
       7 . A composition for controlling the release of an active material, selected from fragrances, sunscreens, vitamins, drugs, biocides, pest repellents, catalysts and cooling agents, from a cleaning composition, personal care product, household care product or textile treatment composition, comprising a blend of the active material and a waxy silicone material, characterized in that the blend of active material and waxy silicone material is in emulsion form, that the waxy silicone material has a melting point 10-200° C., that the waxy silicone material comprises a cyclopolysiloxane in which at least 20 percent of the silicon atoms in the cyclopolysiloxane have an alkyl substituent having 16 to 100 carbon atoms, that 10 to 80 percent of the silicon atoms of the cyclopolysiloxane have a silicon-bonded substituent of the formula X-Ph, wherein X denotes a divalent aliphatic organic group bonded to silicon through a carbon atom and Ph denotes an aromatic group, and that the emulsifying surfactant of the emulsion is a quaternary ammonium material containing at least one ester linking group in the quaternary ammonium molecule.  
   
   
       8 . A composition according to claim  23  in which 50-80 percent of the silicon atoms in the cyclopolysiloxane have an alkyl substituent having 16 to 100 carbon atoms and 20 to 50 percent of the silicon atoms of the cyclopolysiloxane have a silicon-bonded substituent of the formula X-Ph.  
   
   
       9 . A cyclopolysiloxane comprising a wax having a melting point of 10-200° C. wherein at least 20 percent of the silicon atoms in the cyclopolysiloxane wax have an alkyl substituent containing 16 to 100 carbon atoms, and 10 to 80 percent of the silicon atoms of the cyclopolysiloxane wax have a silicon-bonded substituent of the formula X-Ph, wherein X denotes a divalent aliphatic organic group bonded to silicon through a carbon atom and Ph denotes an aromatic group.  
   
   
       10 . A cyclopolysiloxane according to claim  25  in which 50-80 percent of the silicon atoms in the cyclopolysiloxane wax have an alkyl substituent containing 16 to 100 carbon atoms, and 20 to 50 percent of the silicon atoms of the cyclopolysiloxane wax have a silicon-bonded substituent of the formula X-Ph.