Polymerizable thioacrylate compositions and optical lenses with a high refractive index obtained from said compositions

A polymer produced by polymerization of a composition comprising base copolymerizable monomer constituents that comprise at least 85% by weight, with respect to the total weight of copolymerizable monomers present in the composition comprising:

• (a) a mixture M consisting, per 100 parts by weight of the mixture, of:
• (i) 20 to 80 parts of one or more nonaromatic compounds (I) of formula:
• in which R3 represents a linear or branched divalent aliphatic hydrocarbonaceous radical and R4 represents a hydrogen atom or a CH3 group;
• and
• (ii) 80 to 20 parts of a compound (II) of formula:
• in which R1 and R2 represent, independently of one another, H or CH3 and m+n has a mean value of 0 to 20 inclusive;
• and
• (b) 3 to 30% by weight, with respect to the weight of the mixture M, of a polythiol;
• the composition comprising less than 5% by weight, with respect to the total weight of the copolymerizable monomers present in the composition, of an aromatic compound selected from the group consisting of aromatic thio(meth)acrylate monomers, aromatic or cyclanic mono(meth)acrylate monomers, and aromatic vinyl monomers.

An optical lens composed of a polymer produced by the polymerization of a composition, comprising a polymerizable composition comprising base copolymerizable monomer constituents that comprise at least 85% by weight, with respect to the total weight of copolymerizable monomers present in the composition comprising:

• (a) a mixture M consisting, per 100 parts by weight of the mixture, of:
• (i) 20 to 80 parts of one or more nonaromatic compounds (I) of formula
• in which R3 represents a linear or branched divalent aliphatic hydrocarbonaceous radical and R4 represents a hydrogen atom or a CH3 group;
• and
• (ii) 80 to 20 parts of a compound (II) of formula:
• in which R1 and R2 represent, independently of one another, H or CH3 and m+n has a mean value of 0 to 20 inclusive;
• and
• (b) 3 to 30% by weight, with respect to the weight of the mixture M, of a polythiol;
• the composition comprising less than 5% by weight, with respect to the total weight of the copolymerizable monomers present in the composition, of an aromatic compound selected from the group consisting of aromatic thio(meth)acrylate monomers, aromatic or cyclanic mono(meth)acrylate monomers, and aromatic vinyl monomers.