Zirconium-based and lanthanum-based ethylenically unsaturated metal salts

A (Co)polymerizable ethylenically unsaturated metal salt which is soluble in an ethylenically unsaturated reactive diluent, wherein the metal salt is a zirconium or zirconium oxide salt or a lanthanum salt with an ethylenically unsaturated hemi-ester of a dicarboxylic acid of formula (I):

• (X)n—R1—O2C—R—CO2 (I)
• and optionally, in addition to the said hemi-ester (I), in the presence of a saturated monocarboxylic acid of formula (II):
• R2CO2H, and that the said salt is defined according to one of the following formulae (Ill), (IV) or (V):
• [(X)nR1—O2C—R—CO2—]4-xZr(—O2CR2)x (III), with x=0 or 1 or 2 or 3,
• [(X)nR1—O2C—R—CO2—]2-xZr(=O)(—O2CR2)x (IV), with x=0 or 1, and
• [(X)nR1—O2C—R—CO2—]3-xLa(—O2CR2)x (V), with x=0 or 1 or 2,
• R being the residue, without the carboxyl groups, of a dicarboxylic acid of aliphatic, cycloaliphatic, aromatic or mixed structure,
• R1—(X)n being the residue, without OH, of an ethylenically unsaturated monoalcohol carrying n ethylenically unsaturated functional groups X chosen from (meth)acrylate (—CO2—C(R3)═CH2, with R3:
• —H or —CH3), vinyl (—CH2═CH2) or allyl (—CH2—CH2═CH2), with n being an integer ranging from 1 to 5 or from 1 to 3 or n being equal to 1, and
• R2 being the residue, without carboxylic group, of a saturated (without ethylenic unsaturation) monocarboxylic acid chosen from:
• a monoacid other than a dicarboxylic acid hemi-ester, the said monoacid being aliphatic, cycloaliphatic, heterocyclic, aromatic or mixed, or
• an acid hemi-ester of a dicarboxylic acid, of formula (VI):
• R′1—O2C—R′—CO2H,
• with, in this case, R2═R′1—O2C—R′—
• and
• R′1 being the residue of a saturated monoalcohol of aliphatic, cycloaliphatic, aromatic or mixed structure, and
• R′ being the residue of a dicarboxylic acid, without carboxyl groups, of saturated structure (without ethylenic unsaturation) of aliphatic, cycloaliphatic, aromatic or mixed structure, which can be identical to R when R is of saturated structure or which can be different from R,
• and optionally the said metal salt being in the form of a solution in an ethylenically unsaturated reactive diluent copolymerizable with the said salt.