Patent ID: 6533815
Filing Date: 2003-03-18
Classification: C08G,G02B

Abstract:
An ophthalmic lens composed of a transparent organic polymer material with a high refractive index and a high Abbe number, resulting from the polymerization of a mixture of monomers comprising:at least one polythiol monomer; and at least one monomer with a high Abbe number, wherein the monomer with a high Abbe number is of formula: Z&Parenopenst;A)na where A is a bridged cyclic group comprising an intracyclic ethylenic double bond or a linear or branched aliphatic residue comprising an ethylenic unsaturation and na is an integer from 2 to 4, and (I) when na=2, Z is a divalent radical of formulae: in which formulae X represents â€”Oâ€” or â€”Sâ€”, G and Gâ€² are â€”(Cnâ€²H2nâ€²Oâ€”)mâ€² groups, with nâ€²=1 to 5 and mâ€² varies from 0 to 10, or a C1-C5 alkylene group, Z1 is chosen from divalent radicals of formulae: in which formulae Q represents a divalent radical chosen from â€”C(Râ€²)2-, â€”Oâ€”, â€”Sâ€”, â€”SO2â€” and â€”NRâ€²â€”, Râ€² being a hydrogen atom or a C1-C3 alkyl radical, B1 is a divalent radical chosen from â€”C(R2)2â€”, â€”Sâ€” and â€”SOâ€”2â€”, where R2 is a C1-C3 alkyl radical, x1=0 or 1, Y1 independently represents Br, Cl or H, y1 is an integer from 0 to 4, Rb is a â€”(CH2)â€”q group, q being an integer from 1 to 4, and p is an integer from 0 to 4, and Z2 is a divalent radical chosen from radicals of formulae: where Q, Rb and p are defined as above and Z3 is a divalent radical chosen from: where Q and X1 are defined as above; (II) when na=3, Z represents a trivalent radical chosen from: where Rb and p are defined as above and Rc represents H or a C1-C3 alkyl group; and (III) when na=4, Z represents a tetravalent radical of formula: where R3 is a C1-C5 alkylene radical or a divalent radical of formula: where Rb and p are defined above.