| 摘要 |
PCT No. PCT/US96/10654 Sec. 371 Date Oct. 19, 1997 Sec. 102(e) Date Oct. 19, 1997 PCT Filed Jun. 20, 1996 PCT Pub. No. WO97/03373 PCT Pub. Date Jan. 30, 1997The invention relates to photochromic transparent organic materials presenting an index of refraction of more than 1.55, which are free of optical distortions and are prepared by radical polymerization of a polymerizable composition comprising: a) 80-95 wt % of at least one monomer represented by the general formula (I): where R=H or CH3, and m and n are independently 1 or 2; b) 5-20 wt % of at least one aromatic monovinyl monomer represented by the general formula (II): c) an effective quantity of at least one dye that imparts photochromic properties to the material, selected from the groups of spiroxazines, spiropyrans and chromenes; d) an effective quantity of a chain transfer agent; and e) an effective quantity of a radical polymerization initiator, characterized in that the chain transfer agent is a linear alkanethiol and the radical polymerization initiator is a diazo compound.
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