Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Gas Company, Inc.

Akikazu Amagai

Motoharu Takeuchi

Toshiaki Yamada

Yasumasa Norisue

Daisuke Ohno

Makoto Miyamoto

Kiyonari Hiramatsu

Kenzi Ishii

Katsutoshi Yamazaki

Katsuyuki Mizuno

Akitoshi Sugio

Takao Kawaki

Masanori Shimuta

Atsuki Niimi

Hajime Ban

Hiroshi Horikoshi

Hidefumi Harada

Masanobu Masu

Yoshinori Kondo

Masao Okabe

Shizuo Togo

Koji Yamamoto

Kenichi Takahashi

Yuichi Yoshimura

Toshihiko Kobayashi

Nobuyuki Uemura

Yasuhiro Hirai

Yuji Takeda

A bifunctional phenylene ether oligomer of the formula (1), obtained by oxidation polymerization of a bivalent phenol of the formula (2) and a monovalent phenol of the formula (3),HO&#x2014;YO&#x2014;X&#x2014;OY&#x2014;OH &#x2003;&#x2003;(1)HO&#x2014;X&#x2014;OH &#x2003;&#x2003;(2)Y&#x2014;OH &#x2003;&#x2003;(3) and Y&#x2014;O&#x2014; is represented by the formula (3), 

Carboxylic acid-modified biphenyl epoxy diacrylate

A bifunctional phenylene ether oligomer containing monophenylene and biphenylene moieties can be rendered thermosetting by reacting the terminal phenolic hydroxyl groups with a) a cyanogen halide to introduce terminal cyanate groups, b) a halogenated glycidyl to form terminal epoxy groups, or c) an allyl halide to produce allylic terminal groups. The epoxy-terminated phenylene ether oligomer can be further reacted acrylic and/or methacrylic acid to yield an epoxy di(meth)acrylate which can be further modified with a carboxylic acid or anhydride to obtain and acid-modified epoxy di(meth)acrylate.

Di(meth)acrylate of epoxy-terminated polyphenylene ether

Episulfide compounds useful as starting materials of optical materials are stably stored for a long period of time at a temperature ranging from their solidifying points to 20&#xb0; C., preventing the production or precipitation of polymers and the yellowing.

Method of storing episulfide compound

A bifunctional phenylene ether oligomer of the formula (1), obtained by oxidation polymerization of a bivalent phenol of the formula (2) and a monovalent phenol of the formula (3),  and Y&#x2014;O&#x2014; is represented by the formula (3), 

Bifunctional phenylene ether oligomer, its derivatives, its use and process for the production thereof

A bifunctional phenylene ether oligomer of the formula (1), obtained by oxidation polymerization of a bivalent phenol of the formula (2) and a monovalent phenol of the formula (3),

A process for producing a lens comprising polymerizing bis(&bgr;-epithiopropyl)ether to form a lens.

Process for producing a lens by polymerizing bis(&bgr;-epithiopropyl) ether

A composition for a resin which comprises (a) a compound having one or more structures represented by the following formula in one molecule:

Compositions for a resin

A process for producing a resin used for preparing an optical material. The process comprises curing a composition comprising an ultraviolet light absorbent and an epithio compound by polymerization in the presence of a catalyst, wherein the ultraviolet light absorbent and the catalyst are in amounts, each expressed as parts by weight per 100 parts by weight of the total amount of the epithio compound, which satisfy both of the following relationships (a) and (b): (a) 0.001&lE;ultraviolet light absorbent&lE;1,000, and (b) 0.001&lE;catalyst&lE;5,000. The process prevents coloration and clouding of optical material for a lens obtained by polymerization of an epithio compound caused by addition of an ultraviolet light absorbent.

Process for producing a novel resin for optical materials having excellent color tone and transparency

A process for tinting a resin and a tinted optical material produced by the process. The process comprising dipping a resin into a liquid containing at least one compound selected from the group consisting of polar inorganic compounds and polar organic compounds and subsequently tinting the resin, wherein the resin is obtained by curing by polymerization of a sulfur-containing compound alone or a composition comprising the sulfur-containing compound, the sulfur-containing compound having in the molecule thereof one or more structures represented by the following formula

Process for tinting a resin having a large refractivity index and optical material tinted by the process

Process for treating a compound having epithio structures for disposal

A composition for a resin comprising (a) a sulfur-containing compound having in one molecule one or more episulfide groups and/or epoxy groups and (b) a compound having in one molecule one or more isocyanate groups and/or thioisocyanate groups. The composition is useful as an optical material such for a plastic lens for glasses, since the composition exhibits an excellent balance between refractivity index and Abbe number and has a high impact resistance.

Composition for a resin

A resinous composition which comprises a compound having, in one molecule, one or more structures of the formula (1) ##STR1## wherein R.sup.1 is a hydrocarbon having 1 to 10 carbon atoms; R.sup.2, R.sup.3 and R.sup.4 are each hydrogen or a hydrocarbon group having 1 to 10 carbon atoms; and X is S or O, and a ratio of S to the total of S and O constituting the three-membered ring is 50% or more on the average; and another compound having one or more SH groups in one molecule. The resinous composition can be used for an optical material having improved oxidation resistance.

Resin for optical material

An alkyl sulfide type episulfide compound represented by the following general formula (I) or (II) is herein disclosed: ##STR1## A material obtained by polymerizing/curing the above-mentioned compound is desirable as an optical material for various purposes, particularly a lens material for spectacles.

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Tokyo, Japan

Akikazu Amagai