Back to results
US 2003/0194487 A1Published application
Process for producing plastic lens and plastic lens
AssigneeHoya Corporation
InventorMasahisa Kosaka
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHoya Corporation
InventorMasahisa Kosaka
Estimating the term…
A process for producing plastic lenses, having higher refractive index and Abbe's number without remarkably deteriorating basic physical properties such as mechanical strength, impact resistance and transparency, and plastic lenses. The process comprises mixing 1) a prepolymer with 2) a mixture comprising sulfur in an epithio group-containing compound and 3) a catalyst.
A process for producing a plastic lens, comprising mixing (1) a prepolymer obtainable by reacting a polyisocyanate compound and a polythiol compound in an epithio group-containing compound with (2) a mixture comprising sulfur in an epithio group-containing compound and (3) a mixture of a catalyst with at least one compound chosen from an epithio group-containing compound and a polythiol compound.
A plastic lens formed by the process comprising mixing (1) a prepolymer obtainable by reacting a polyisocyanate compound and a polythiol compound in an epithio group-containing compound with (2) a mixture comprising sulfur in an epithio group-containing compound and (3) a mixture of a catalyst with at least one compound chosen from an epithio group-containing compound and a polythiol compound.
A transparent plastic lens obtainable by reacting a polyisocyanate compound, a polythiol compound, an epithio group-containing compound, and sulfur.
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Drawings are temporarily unavailable. Open the PDF at USPTO
Made of organic materials, e.g. plastics: lenses
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
Composite [nonstructural laminate]: of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
Optical elements, systems or apparatus
Term end not estimated
The present application claims priority under 35 U.S.C. §119 of Japanese Application No. 2002-090423, filed Mar. 28, 2002, the disclosure of which is expressly incorporated by reference herein.
1. Field of the Invention
A novel process is described for producing plastic lenses for spectacles having a high refractive index, a high Abbe number and having excellent transparency, and to plastic lenses obtained by the process.
The physical properties of the plastic lenses for spectacles obtained in the Examples and Comparative Examples were evaluated in the following manners.
(1) Refractive Index and Abbe's Number
Measured at 20° C. using a precision refractometer, Model KPR-200 manufactured by Kalnew Optical Industrial Co., Ltd.