Optical resin material having improved birefringence
AssigneeSumitomo Chemical Company, Limited
InventorsIko Ito, Shozaburo Imai, Michihisa Isobe
Life of this patent
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Abstract
An optical resin material comprising at least two constituent units each having positive and negative main polarizability differences of at least 50.times.10.sup.-25 cm.sup.3 in terms of absolute values has small birefringence and good water absorbance, heat resistance and moldability.
Claims8
An optical resin material which comprises at least one constituent unit having positive main polarizability difference, and at least one constituent unit having negative main polarizability difference,
- and wherein said constituent units have main polarizability differences of at least 50.times.10.sup.-25 cm.sup.3 in terms of absolute values.
A transparent optical resin material which comprises an aromatic polycarbonate as a constituent unit having positive main polarizability difference, and an aromatic vinyl polymer as a constituent unit having negative main polarizability difference,
- and wherein said constituent units have main polarizability differences of at least 50.times.10.sup.-25 cm.sup.3 in terms of absolute values.
Dependencies are inferred from the claim text.