Liquid polymerizable composition comprising mineral nanoparticles and its use to manufacture an optical article

An ophthalmic lens or an optical lens for an optical instrument, comprising an optical substrate coated with a cured product of a liquid polymerizable composition comprising:

• a liquid monomer composition as a continuous phase containing:
• phosphine oxide of formula (Ia):
• wherein:
• at least one among R1a, R2a and R3a, identical or different, represents:
• —(R4)n—X—(R5-Y)m—(R6)p-Q wherein:
• R4, R5 and R6, identical or different, represent a C1-C6 alkylene group, one or several carbon atoms of which may be replaced with a phenylene group,
• X and Y, identical or different, represent O, S, or —NR—, wherein R is a C1-C6 alkyl group,
• n, m and p, identical or different, represent an integer from 0 to 4,
• Q represents a polymerizable function, preferably chosen from acrylate, methacrylate, thioacrylate, thiomethacrylate, or thiol,
• and the other(s) among R1a, R2a and R3a, identical or different, represent(s) a hydrogen atom, phenyl, C1-C6alkoxy, C1-C6alkylthio, aryloxy, arylthio, aryl C1-C6alkoxy, or aryl C1-C6alkylthio,
• or a mixture of two different monomers M1 and M2 as a continuous phase, said monomers M1 and M2 being able to react together and form the phosphine oxide of formula (Ia), wherein M1 or M2 or both M1 and M2 contain the function P=O and M1 and M2 further contain functions which are able to react together to form a polymer,
• and mineral nanoparticles homogeneously dispersed in said phosphine oxide of formula (Ia), or in said mixture of two different monomers M1 and M2 which are able to react together and form the phosphine oxide of formula (Ia),
• wherein said mineral nanoparticles are selected from the group consisting of ZnS, ZrO2, TiO2 and BaTiO3,
• wherein the phosphine oxide of formula (Ia) is from 50% to 95% by weight of the liquid polymerizable composition.