| 摘要 |
Transparent, organic photo- or non-photochromic glass materials having a refractive index greater than 1.55 and without optical distortions comprises a copolymer of: (a) 55-90 wt.% of at least one monomer of formula (I); where R = H or CH3 and m and n = independently 1 or 2; (b) 10-30 wt.% of at least one monovinylic aromatic monomer of formula (II); where R1 = H or CH3; (c) 0.1-10 wt.% of divinylic aromatic monomer of formula (III); (d) 1-20 wt.% of (meth)acrylic monomer of general formula CH2=C(R)-COOR' where R' = 4-16C linear or branched alkyl radical, an alkylaryl radical or polyethoxy group of formula -(CH2-CH20)nR"; where n = 1 - 10 and R" = CH3 or C2H5; and (e) an optional quantity of colouring giving photochromic properties selected from spiroxazines, spyropyranes and chromenes. Also claimed are: (i) a process for the preparation of the claimed materials; and (ii) an article made from the claimed materials.
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