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US 4,868,261 AGranted
Optical resin material
AssigneeHitachi Chemical Company, Ltd.
InventorsAkihiro Kobayashi, Toshiyuki Fujita, Takayuki Saito, Hiromasa Kawai, Yutaka Hosoi, Hideaki Shibata
Life of this patent
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Abstract
An optical resin material comprising a polymer containing as an essential component at least one norbornyl acrylate or methacrylate or a derivative thereof is excellent in properties, particularly in moisture resistance and can be used for molding optical elements such as lenses, optical discs, etc.
Claims3
An otpical resin material comprising a copolymer of one or more unsaturated carboxylic acid esters of the formula:
- ##STR3## wherein R is hydrogen or a methyl group;
- n is 0 or an integer of 1, and at least one other polymerizable unsaturated monomer selected from the group consisting of methyl methacrylate, ethyl acrylate, butyl acrylate, N-methylmaleimide, N-ethylmaleimide and N-cyclohexylmaleimide.
Dependencies are inferred from the claim text.