A polymer, capable of releasing in a controlled manner an odoriferous α,β-unsaturated ketone or aldehyde, and comprising at least one repeating unit of formula wherein the double hatched lines indicate the bonding to another repeating unit and - R 1 represents a C 1 to C 16 hydrocarbon group; - P represents a group susceptible of generating a perfuming α,β-unsaturated ketone or aldehyde and is represented by formula in which the wavy line indicates the location of the bond between said P and the sulfur atom; R 2 represents a hydrogen atom, a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, optionally substituted by one to four C 1 to C 4 alkyl groups; and R 3, R 4 and R 5, independently of each other, represent a hydrogen atom, a C 6 to C 10 aromatic ring or a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, possibly substituted by C 1 to C 4 alkyl groups; or two, or three, of the groups R 1 to R 4 are bound together to form a saturated or unsaturated ring having 5 to 20 carbon atoms and, including the carbon atom to which said R 2, R 3, R 4 or R 5 groups are bound, this ring being optionally substituted by one or two C 1 to C 8 linear, branched or cyclic alkyl or alkenyl groups; - each R a, independently from each other represents a hydrogen atom or a methyl group; and - n represents 1 or 2. - R 1 represents a C 1 to C 16 hydrocarbon group; - P represents a group susceptible of generating a perfuming α,β-unsaturated ketone or aldehyde and is represented by formula in which the wavy line indicates the location of the bond between said P and the sulfur atom; R 2 represents a hydrogen atom, a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, optionally substituted by one to four C 1 to C 4 alkyl groups; and R 3, R 4 and R 5, independently of each other, represent a hydrogen atom, a C 6 to C 10 aromatic ring or a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, possibly substituted by C 1 to C 4 alkyl groups; or two, or three, of the groups R 1 to R 4 are bound together to form a saturated or unsaturated ring having 5 to 20 carbon atoms and, including the carbon atom to which said R 2, R 3, R 4 or R 5 groups are bound, this ring being optionally substituted by one or two C 1 to C 8 linear, branched or cyclic alkyl or alkenyl groups; R 2 represents a hydrogen atom, a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, optionally substituted by one to four C 1 to C 4 alkyl groups; and R 3, R 4 and R 5, independently of each other, represent a hydrogen atom, a C 6 to C 10 aromatic ring or a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, possibly substituted by C 1 to C 4 alkyl groups; or two, or three, of the groups R 1 to R 4 are bound together to form a saturated or unsaturated ring having 5 to 20 carbon atoms and, including the carbon atom to which said R 2, R 3, R 4 or R 5 groups are bound, this ring being optionally substituted by one or two C 1 to C 8 linear, branched or cyclic alkyl or alkenyl groups; - each R a, independently from each other represents a hydrogen atom or a methyl group; and - n represents 1 or 2.