Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Patent
1998-10-19
2000-09-26
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
528403, 528374, 351 49, 351166, 351232, C08G 6500
Patent
active
061244244
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel transparent optical material which has high refractive index, low dispersion and excellent optical property, and is used for a glasses lens, camera lens, prism, substrate for an information recording medium, pick up lens, optical fiber, optical filter and the like, to a plastic lens using this material, and to a method for producing the same. Further, the present invention also relates to a novel selenium-containing compound useful as a raw material for the above-described transparent optical material.
BACKGROUND ART
A transparent optical material and a plastic lens are molded articles required to have high transparency and optical uniformity as is apparent from the uses thereof. As a material conventionally used widely in these uses, there is listed a plastic material obtained by radical polymerization of diethylene glycol bis(allyl carbonate) (hereinafter, abbreviated as DAC).
However, this DAC plastic material has low refractive index (Nd) as low as 1.50, and when used for a plastic lens, there is a problem that the resulted lens has large edge thickness and is deficient in fashionable appearance.
For improving this problem, various investigations have been made for increasing refractive index. For example, there are listed a method in which tetrabromo bisphenol-A is reacted with an isocyanate compound (Japanese Patent Application Laid-Open (JP-A) No. 58-164,615), a method in which xylylenedithiol dimethacryalte is polymerized (JP-A No. 64-31,759), a method in which 1,4-dithiane-2,5-dimercaptomethyl is used (Japanese Patent Application Publication (JP-B) No. 6-5,323), and the like.
Also the present inventors have previously suggested methods in which a polythiol having in the molecule a sulfur atom other than a mercapto group is used (JP-A Nos. 2-270,859 and 7-252,207), and the like.
Any of these methods is a method in which refractive index is improved by introducing a benzene ring, a halogen atom such as bromine, or a sulfur atom into the molecule. However, when refractive index is desired to be further improved, these methods have been often insufficient. That is, these methods have not been recognized as methods fully satisfying eager requirement to further decrease the edge thick of a lens.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a transparent optical material and a plastic lens which can have further improved refractive index and further decreased edge thickness of the lens.
Further object of the present invention is to provide a novel compound useful for the novel transparent optical material, and a composition containing this compound.
The present inventors have intensively investigated to satisfy the above-described strong requirement, and as a result, found that refractive index can be further improved by introducing a selenium atom into the molecule of an optical material, completing the present invention.
Namely, the present invention provides a transparent optical material and a plastic lens containing in the molecule at least one selenium atom, and a method for producing a transparent optical material and a plastic lens in which a composition containing at least one reactive monomer or oligomer having at least one selenium atom in its molecule is subjected to casting polymerization.
This technique for introducing a selenium atom into the molecule of an optical material has not been known until now.
The present invention contains the following subjects. atom. according to subject 1. which comprises the step of cast-polymerizing a composition including at least one reactive monomer or oligomer having at least one selenium atom in its molecule. the step of cast-polymerizing a composition including at least one reactive monomer or oligomer having at least one selenium atoms in its molecule. monomer or oligomer having at least one selenium atom in its molecule is selected from selenium atom-including active hydrogen compounds having at least one functional group of a hydroxyl group,
REFERENCES:
patent: 4320939 (1982-03-01), Mueller
patent: 4320940 (1982-03-01), Mueller et al.
patent: 5604280 (1997-02-01), Pozzo et al.
Honma Shiro
Kanemura Yoshinobu
Kusumoto Masahiko
Morijiri Hiroyuki
Okazaki Koju
Mitsui Chemicals Inc.
Truong Duc
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