Fragrance delivery

Abstract

A substrate such as a fabric may be provided with a fragrance during washing or rinsing process by the addition to the wash water of a free-flowing solid fragrance-providing composition that comprises a fragrance deposited on a particulate carrier along with a water soluble salt of an alkali metal or an alkaline earth metal.

1 . A method of preparation of a free-flowing solid fragrance-providing composition, comprising the addition of a fragrance to a particulate carrier material in the presence of a water-soluble salt of an alkali or alkaline earth metal.  
   
   
       2 . A method according to  claim 1 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:1 to 1:20.  
   
   
       3 . A method according to  claim 1 , in which the weight ratio of water-soluble salt to fragrance is from 20:1 to 1.5:1.  
   
   
       4 . A method according to  claim 1  in which the particulate carrier is fine, porous silica, optionally replaced to a maximum of 50% by weight of other absorbent particulate materials.  
   
   
       5 . A free-flowing solid fragrance-providing composition, consisting essentially of a particulate carrier on which is deposited a fragrance and a water-soluble salt of an alkali or alkaline earth metal, the composition comprising at least 60% by weight of water-soluble salt and 20% maximum by weight of particulate carrier, and the ratio of water-soluble salt to fragrance being from 20:1 to 1.5:1.  
   
   
       6 . A composition according to  claim 1 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:2 to 1:20, and the weight ratio of water-soluble salt to fragrance is from 8:1 to 5:1.  
   
   
       7 . A composition according to  claim 6 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:2 to 1:20, and the weight ratio of water-soluble salt to fragrance is from 10:1 to 20:1.  
   
   
       8 . A method of providing a fragrance to a substrate during washing or rinsing, comprising the adding to the wash or rinse water of a free-flowing solid fragrance-providing composition according to  claim 5 .  
   
   
       9 . A method according to  claim 2 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:5 to 1:20.  
   
   
       10 . A method according to  claim 9 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:10 to 1:20.  
   
   
       11 . A method according to  claim 2 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:8 to 1:15.  
   
   
       12 . A method according to  claim 3 , in which the weight ratio of water-soluble salt to fragrance is from 8:1 to 5:1.  
   
   
       13 . A method according to  claim 12  in which the weight ratio of water-soluble salt to fragrance is from 10:1 to 20:1.  
   
   
       14 . A composition according to  claim 6 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:5 to 1:20, and the weight ratio of water-soluble salt to fragrance is from 8:1 to 5:1.  
   
   
       15 . A composition according to  claim 14 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:10 to 1:20, and the weight ratio of water-soluble salt to fragrance is from 8:1 to 5:1.  
   
   
       16 . A composition according to  claim 15 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:8 to 1:15, and the weight ratio of water-soluble salt to fragrance is from 8:1 to 5:1.  
   
   
       17 . A composition according to  claim 6 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:2 to 1:20, and the weight ratio of water-soluble salt to fragrance is from 10:1 to 20:1.  
   
   
       18 . A composition according to  claim 7 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:5 to 1:20 and the weight ratio of water-soluble salt to fragrance is from 10:1 to 20:1.  
   
   
       19 . A composition according to  claim 18 , in which the weight ratio of particulate carrier to water-soluble salt is from 1:10 to 1:20 and the weight ratio of water-soluble salt to fragrance is from 10:1 to 20:1.  
   
   
       20 . A method of providing a fragrance to a substrate during washing or rinsing, comprising the adding to the wash or rinse water of a free-flowing solid fragrance-providing composition according to  claim 6.