| 摘要 |
PURPOSE:To obtain the titled lens which has no difference in level, and makes the best use of a merit of the plastic lens, and has an improved sticking strength of between a base lens and a small lens by constituting the titled lens from the base lens and the small lens which are composed of copolymers having specific monomer components respectively. CONSTITUTION:The double focus lens 1 made of the plastic is composed of the base lens 2 and the small lens 3. The base lens 2 is composed of the copolymer comprising diethylene glycol bisallyl carbonate, a monofunctional (meth) acrylate, a polyfunctional (meth)acrylate and a polyfunctional allyl monomer, as a monomer component. The small lens 3 is composed the copolymer comprising di(meth)acrylate contg. a bisphenol A structure which substitutes an aromatic ring with halogen atom or is not substituted, and (meth)acrylate contg. isocyanate group or/and a vinyl monomer as a monomer component. The diethylene glycol bisally carbonate which is the copolymer for the base lens use, is the main component of the base lens, and is the constituting component of the titled lens, and is used for give especially a mechanical workability (grindability), a light-weight property and a shock-resisting property to the titled lens.
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