Hoya Corporation

Jian Jiang

Yoshitaka Kitahara

Hiroshi Ohta

Masahiro Aoyama

Masahisa Kosaka

Tsuyoshi Okubo

The invention provides a novel polyisocyanate compound which is useful as a starting material for an optical material having a high refractive index, a low dispersion and excellent optical characteristics, and a process for producing this compound at good efficiency. The invention also provides an optical material having a high refractive index, a low dispersion, an excellent transparency without optical distortion and having good solvent resistance and weatherability.

Polyisocyanate compounds, process for producing the same, and optical materials using the same

Asymmetric disulfide compounds and methods for their preparation are described. An optical product can be made of a polymer that is obtained by using at least one asymmetric disulfide compound as an essential monomer component. These polymers can be used to form an optical product having a high refractive index and a high Abbe's number and having superior heat resistance, superior weather resistance and superior transparency.

Asymmetric disulfide compounds, method for producing the same, and optical products

The invention provides a novel polyisocyanate compound which is useful as a starting material for an optical material having a high refractive index, a low dispersion and excellent optical characteristics, and a process for producing this compound at good efficiency. The invention also provides an optical material having a high refractive index, a low dispersion, an excellent transparency without optical distortion and having good heat resistance.

The present invention provides optical parts having good impact resistance, good adhesiveness between the substrate and a thin film layer coating formed thereon, good scratch resistance and good antireflection capabilities. The thin film layer coating composition comprises (1) a dithian ring containing sulfur compound and/or a benzene ring containing sulfur compound, and (2) a polyfunctional thiol compound.

Coating composition and thin film layer for optical parts

Coating composition for optical parts thin film layer made of it and optical part comprising

A novel polyisocyanate compound, which compound is useful as a starting material for an optical material having excellent optical characteristics such as a high refractive index and a low dispersion, and a process for producing this compound at good efficiency. Specifically, a polyisocyanate compound represented by general formula (I):

Polyisocyanate compound, process for producing the same and optical materials using the same

It is difficult to efficiently fabricate optical lenses on which gradation coloring is finely implemented. Gradation coloring is implemented on optical lenses by using an optical lens coloring system having an optical lens holding device for holding an optical lens, a coloring agent discharging device provided with one or a plurality of nozzles for discharging coloring agent for coloring the optical lens, and a relative position control device for controlling a relative position of the optical lens holding device and the coloring agent discharging device. The relative position control device controls the relative position of the optical lens holding device and the coloring agent discharging device such that coloring agent discharged out of the coloring agent discharging device arrives at a predetermined plane substantially from a direction normal to a predetermined plane of an optical lens held by the optical lens holding device.

Optical lens coloring system

A process for producing a polythiol oligomer having disulfide linkages by reacting polythiol (with the functionality of two or above) with sulfur in a molar ratio of m to (m-1) (where m is an integer of 2 to 21) in the presence of a basic catalyst, whereby the oligomers produced have a degree of oligomerization of m (wherein m is defined as above). Specifically disclosed is a process for reacting 2,5-dimercaptomethyl-1,4-dithiane (DMMD) with sulfur in a molar ratio 2:1 or 3:2 in the presence of a basic catalyst, thereby producing an oligomer represented by the below formula: ##STR1## (wherein n is an integer of up to 21). Also disclosed are optical polymers made with the oligomer and optical materials and devices made with the polymer.

Growing community of inventors

Tokyo, Japan

Jian Jiang