Odorant mixture for odorless gas fuel

Composition which can be used in particular as odorant for a gaseous fuel, more particularly natural gas, comprising:

• (a) from 5 to 14.95% of parts by weight of at least one alkyl sulphide (I) of formula:
• R1—S—R2
• in which R1 and R2, which are identical or different, and are selected from
• an alkyl radical comprising from 1 to 4 carbon atoms;
• or
• a saturated or unsaturated ring comprising from 3 to 5 carbon atoms when taken with the sulphur atom to which they are attached which ring is optionally substituted by a C1-C4 alkyl or C1-C4 alkenyl radical;
• (b) from 85 to 94.95% parts by weight of at least two alkyl acrylates (II), the alkyl radicals of which comprise from 1 to 12 carbon atoms;
• (c) from 0.005 to 0.05% part by weight of at least one compound (III) which inhibits the polymerization of the alkyl acrylates (II) in the absence of oxygen, consisting of a stable nitroxide radical of formula (IV):
• in which R3 and R4, which are identical or different, and are selected from
• a tertiary or secondary hydrocarbon radical comprising from 2 to 30 carbon atoms and optionally one or more heteroatoms chosen from sulphur, phosphorus, nitrogen or oxygen;
• or
• a cyclic hydrocarbon radical comprising from 4 to 10 carbon atoms taken with the nitrogen atom to which they are attached, said radical optionally being substituted.