Patent ID: 8022030

Claim:
A co-polymer, for releasing in a controlled manner an odoriferous α,β-unsaturated ketone, aldehyde or carboxylic ester, and comprising at least one repeating unit of formula wherein P represents a radical susceptible of generating an odoriferous α,β-unsaturated ketone, aldehyde or carboxylic ester and is represented by formula in which the wavy line indicates the location of the bond between said P and X; R 1 represents a hydrogen atom, a C 1 to C 6 alkoxyl radical or a C 1 to C 15 linear, cyclic or branched alkyl, alkenyl or alkadienyl radical, optionally substituted by C 1 to C 4 alkyl groups; and R 2 , R 3 and R 4 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, optionally 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 1 , R 2 , R 3 or R 4 groups are bound, this ring being optionally substituted by C 1 to C 8 linear, branched or cyclic alkyl or alkenyl groups; X represents a functional group selected from the group consisting of the formulae i) to v): in which formulae wavy lines indicate bonds between P and X and the bold lines indicate the location of the bond between said X and L, and R 5 represents a hydrogen atom or a C 1 -C 4 alkyl group; L represents a C 2 -C 15 hydrocarbon group optionally comprising from 1 to 10 oxygen, sulfur or nitrogen atoms; Z represents an oxygen or sulfur atom or a NR 5 group, R 5 representing a hydrogen atom or a C 1 -C 4 alkyl group; the R 6 groups represent independently of each other a hydrogen atom or a C 1 -C 4 hydrocarbon group; and M represents a hydrogen atom, an alkali or earth alkali metal ion if Z represents an oxygen or sulfur atom or a hydrogen atom if Z represents a NR 5 group.