Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From sulfur-containing reactant
Reexamination Certificate
2005-07-27
2008-11-04
Zimmer, Marc S (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From sulfur-containing reactant
C528S378000, C528S360000
Reexamination Certificate
active
07446163
ABSTRACT:
In the present invention, an episulfide compound having, in one molecule, at least one epithio structure represented by the following Formula 2:wherein R5is C1-C10 hydrocarbylene or single bond, R6, R7and R8are 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 R1, R2and R3are each C1-C10 hydrocarbyl or hydrogen, R4is C1-C10 hydrocarbylene or single bond, X is F, Cl, Br, I, As, SH, OH, C1-C10 alkoxyl, C1-C10 alkylthio, or C1-C10 mercaptoalkylthio, 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.
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Horikoshi Hiroshi
Matsui Takahiro
Okada Hiroyuki
Shimuta Masanori
Takeuchi Motoharu
Antonelli, Terry Stout & Kraus, LLP.
Mitsubishi Gas Chemical Company Inc.
Zimmer Marc S
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