Compositions based on dimethyl disulphide with a masked smell

Abstract

A composition based on dimethyl disulphide (DMDS) with a masked smell according to the invention comprises, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan, less than 100 ppm of dimethylsulphide and up to 1% of at least one odor-masking agent.

1 . Composition based on dimethyl disulphide (DMDS), characterized in that it comprises, by weight, at least 95% of DMDS, less than 500 ppm of methyl mercaptan, less than 100 ppm of dimethyl sulphide and up to 1% of at least one odour-masking agent.  
     
     
         2 . Composition according to    claim 1   , comprising less than 200 ppm of methyl mercaptan and less than 50 ppm of dimethyl sulphide.  
     
     
         3 . Composition according to    claim 1    or    2   , comprising from 0.1 to 0.5% of odour-masking agent(s), preferably approximately 0.2%.  
     
     
         4 . Composition according to one of    claims 1    to    3   , in which the odour-masking agent is chosen from the esters corresponding to the general formula: 
       R 1 CO 2 R 2   (I) 
       in which R 1  represents an optionally unsaturated, linear or branched hydrocarbon-comprising radical comprising from 1 to 4 carbon atoms and R 2  represents an optionally unsaturated, linear, branched or cyclic hydrocarbon-comprising radical comprising from 2 to 8 carbon atoms.  
     
     
         5 . Composition according to    claim 4   , in which the odour-masking agent is chosen from the group consisting of isoamyl acetate, 2-methylbutyl butyrate, isoamyl butyrate, benzyl acetate and the mixtures of these compounds.  
     
     
         6 . Composition according to    claim 4    or    5   , in which the ester of formula (I) is used in combination with an ortho-phthalate corresponding to the general formula:  
                 
 
       in which the symbols R 3  and R 4 , which are identical or different, each represent an optionally unsaturated, linear, branched or cyclic hydrocarbon-comprising radical comprising from 1 to 8 carbon atoms.  
     
     
         7 . Composition according to    claim 6   , in which the ortho-phthalate is diethyl ortho-phthalate.  
     
     
         8 . Composition according to    claim 7   , comprising 0.1% of isoamyl acetate and 0.1% of diethyl ortho-phthalate.  
     
     
         9 . Composition according to    claim 7   , comprising 0.05% of isoamyl acetate, 0.03% of 2-methylbutyl butyrate, 0.02% of benzyl acetate and 0.1% of diethyl ortho-phthalate.