Abstract: A process for polymerizing episulfide monomers comprising the steps of: (c) mixing to an episulfide monomer or a mixture of episulfide monomers an effective amount of at least one photopolymerization catalyst selected from the group consisting of (cyclopentadienyl) ruthenium and osmium complexes and an effective amount of at least a co-catalyst selected from phosphonium salts, phosphines and amines; and (d) irradiating the mixture of (a) with an ultra-violet radiation to polymerize the mixture.

Abstract: The present invention relates to room temperature or thermally polymerizable/curable episulfide based compositions for making polymerized/cured episulfide based resins, and in particular episulfide based compositions which can be fastly polymerized/cured, as well as to a room temperature or thermal polymerization process for making such episulfide based resins.

Abstract: The present invention relates to an improved process or method for transferring a coating onto at least one surface of a lens blank which can be implemented in a short period of time without any risk of deformation of the lens blank.

Abstract: A process for polymerizing episulfide monomers comprising the steps of:

Abstract: The present invention relates to an improved process or method for transferring a coating onto at least one surface of a lens blank which can be implemented in a short period of time without any risk of deformation of the lens blank.

Abstract: The present invention relates to polymerizable compositions for the manufacture of optical lenses with a high refractive index and a high Abbe number, and optical lenses comprising these compositions.

Abstract: The composite ophthalmic lens (1) comprises a first layer (2), at least 200 micrometers thick, forming a front part of said lens, of a first polymeric material of refractive index higher than or equal to 1.60 and having a front face (4) constituting a front optical surface S1, and a second layer (3), at least 200 micrometers thick, of a second polymeric material forming a rear part of said lens and having a rear face (6) constituting a rear optical surface S2, the interface (5) between these two layers constituting an optical surface S3 parallel to the rear optical surface S2.

Abstract: The composition includes, based on the total weight of polymerizable monomers present in the composition: a) 10 to 70% by weight of a difunctional thio(meth)acrylate monomer, of formula (I): in which R1 and R2 denote a hydrogen atom or a radical —CH3, or of a mixture of at least one monomer of formula (I) with at least one monomer of formula (II): in which R′1 and R′2 denote a hydrogen atom or a radical —CH3; b) 10 to 60% by weight of at least one monomer of formula (III): in which R3 and R4 denote a hydrogen atom or a radical —CH3 and O≦m +n≦10; and c) 5 to 30% by weight of at least one aromatic or polycyclane mono(meth)acrylate monomer.

Abstract: Transparent polymer composition comprising:a component A comprising:at least 10% by weight of a monomer or of a mixture of monomers (I), containing at least one thioacrylate or thiomethacrylate function;0 to 90% by weight of one or more monomers (II) which are copolymerizable by a radical route, preferably mono- or polyfunctional vinyl, acrylic or methacrylic; anda component B comprising, relative to the weight of the component A:0.1 to 15% by weight of one or more monomers (III) containing an ethylenic unsaturation which does not contribute to an aromatic system and having a carbon bearing a free hydroxyl group in an .alpha. position relative to the ethylenic unsaturation.Application to the manufacture of ophthalmic lenses.