The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 2007
Filed:
Apr. 04, 2002
Masaki Tamura, Kanagawa, JP;
Takahiro Matsui, Osaka, JP;
Masanori Shimuta, Mie, JP;
Yuichi Yoshimura, Mie, JP;
Motoharu Takeuchi, Tokyo, JP;
Hiroshi Horikoshi, Tokyo, JP;
Hiroyuki Okada, Tokyo, JP;
Masaki Tamura, Kanagawa, JP;
Takahiro Matsui, Osaka, JP;
Masanori Shimuta, Mie, JP;
Yuichi Yoshimura, Mie, JP;
Motoharu Takeuchi, Tokyo, JP;
Hiroshi Horikoshi, Tokyo, JP;
Hiroyuki Okada, Tokyo, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
In the present invention, an episulfide compound having, in one molecule, at least one epithio structure represented by the following Formula 2: wherein Ris C1–C10 hydrocarbylene or single bond, R, Rand Rare each independently C1–C10 hydrocarbyl or hydrogen, Y is O, S, Se or Te, p is an integer from 1 to 5 and q is an integer from 0 to 5,is polymerized in the presence of a halide of a 13–16 group element of the long periodic table and/or a polymerization regulator represented by the following Formula 1: wherein R, Rand Rare each C1–C10 hydocarbyl or hydrogen, Ris C1–C10 hydrocarbylene or single bond, X is F, Cl, Br, I, As, SH, OH, C1–C10 alkoxyl, C1–C10 alkylthio, or C1–C10 mercaptoalkythio, and m is an integer from 1 to 5,to produce a cured resin suitable as an optical material. By using the polymerization regulator, the polymerization rate of the episulfide compound can be suitably regulated to obtain a cured resin with less defect. By using the halide, the increase in the viscosity of the starting composition during the storage or the casting operation can be prevented.