Mitsui Chemicals, Inc.

Itoh Optical Industrial Co., Ltd.

Kouji Suesugi

Shinsuke Ito

Mamoru Tanaka

Takeshi Nishimura

Yusuke Matsui

Masayuki Furuya

Shotaro Nakano

Koju Okazaki

Atsuo Otsuji

Chojiro Higuchi

Masatoshi Takagi

Akinori Ryu

Shigetoshi Kuma

Masaru Kawaguchi

Nobuo Kawato

Akinori Nagatomo

Toshiya Hashimoto

Tatsuya Ogawa

Hirofumi Oda

Kouju Okazaki

Naoki Shinohara

Tetsuya Toida

Narimichi Honda

A polythiol composition includes a polythiol compound (A) including at least one of 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, or 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and a polythiol compound (B) that is 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane.

Polythiol composition and applications thereof

In an optical material, a transmittance curve satisfies the following characteristics (1) and (2) and a hue in the CIE 1976 (L*, a*, b*) color space satisfies the following characteristic (3),

Optical material, polymerizable composition for optical material, cured product, optical material, plastic lens, method of producing optical material, and method of using optical material

An injection molding apparatus includes a substantially circular first substrate, a substantially circular second substrate disposed to face a surface of the first substrate, a fixing member which fixes a peripheral end portion of the first substrate and a peripheral end portion of the second substrate, and an injection portion which is provided in the fixing member and from which a composition is injected into a gap between the first substrate and the second substrate, in which a space connecting with the injection portion and the gap is provided in at least a part of a periphery of the gap, and a width of the space in a thickness direction is larger than a width of the gap in the thickness direction.

Injection molding apparatus, injection molding method and production method of molded product using injection molding apparatus, and laminated lens

A polymerizable composition for an optical material of the present invention includes (A) a compound of which pKa value is 1 to 9, (B) a di- or higher functional iso(thio)cyanate compound, and (C) a di- or higher functional active hydrogen compound.

Polymerizable composition for optical material, optical material, and producing method thereof

A polymerizable composition for an optical material containing two or more different monomers for an optical material, and a polymerization catalyst, in which at least one of the two or more different monomers for an optical material is an isocyanate compound containing an aromatic ring, a content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from 0.010 parts by mass to 0.50 parts by mass, and the viscosity measured by a B-type viscometer at 25&#xb0; C. and 60 rpm is from 10 mPa&#xb7;s to 1,000 mPa&#xb7;s.

Polymerizable composition for optical material, polymerizable prepolymer composition for optical material, cured product, and method of producing optical material

A polymerizable composition for an optical material containing two or more different monomers for an optical material, and a polymerization catalyst, in which at least one of the two or more different monomers for an optical material is an isocyanate compound containing no aromatic rings, a content of the polymerization catalyst with respect to a total of 100 parts by mass of the two or more different monomers for an optical material is from more than 0.05 parts by mass to 2.0 parts by mass, and a viscosity measured by a B-type viscometer at 25&#xb0; C. and 60 rpm is from 10 mPa&#xb7;s to 1,000 mPa&#xb7;s.

A polymerizable composition for an optical material includes a compound represented by General Formula (1) and a polymerization reactive compound. 

Polymerizable composition for optical material, optical material, and application thereof

A process for producing a plastic lens includes a step of stirring and mixing a solution including a polymerization reactive compound in a preparation tank; a step of transferring the polymerizable composition obtained in the step from the preparation tank to a lens casting mold; a step of curing the polymerizable composition; and a step of obtaining a plastic lens molded product by separating the obtained resin from the lens casting mold. The step of transferring the polymerizable composition includes a step of re-mixing the polymerizable composition discharged from the preparation tank and injecting the polymerizable composition into the lens casting mold.

Process for producing plastic lens and apparatus for producing plastic lens

There is provided a polymerizable composition for an optical material including a polyether-modified compound having a polyether group represented by General Formula (4) below, and a polymerization reactive compound. (In General Formula (4), Rrepresents a linear or branched alkylene group having 1 to 20 carbon atoms, Rrepresents a hydrogen atom, a linear or branched alkyl group having 1 to 20 carbon atoms, a linear or branched alkenyl group having 2 to 20 carbon atoms, or a linear or branched alkynyl group having 2 to 20 carbon atoms, a plurality of present R's may be the same or different, and k is an integer equal to or more than 1.)

Polymerizable composition for optical material and optical material and plastic lens obtainable from same composition

A process for producing a polymerizable composition for an optical material of the present invention includes a step of mixing (A) at least one kind of thiol compound having at least two mercapto groups, (B) a tin compound represented by general formula (1), and (C) at least one kind of isocyanate compound having at least two isocyanato groups, in which the polymerizable composition for an optical material obtained in the above step has a haze value of 0.05 or less.(R)&#x2014;Sn&#x2014;X&#x2003;&#x2003;(1)

Process for producing polymerizable composition for optical material and polymerizable composition for optical material

The polymerizable composition for an optical material of the present invention contains (A) at least one kind of isocyanate having two or more isocyanato groups, which contains aromatic isocyanate, (B) at least one kind of alcohol having two or more hydroxyl groups, (C) an acidic phosphoric acid ester represented by the following Formula (1), and (D) a benzotriazole-based compound, in which a ratio of secondary hydroxyl groups to the total molar number of primary and secondary hydroxyl groups contained in the alcohol (B) is equal to or greater than 50%, and the benzotriazole-based compound (D) is contained in an amount of 1 part by weight to 11 parts by weight with respect to a total of 100 parts by weight of the isocyanate (A) and the alcohol (B).

Polymerizable composition for optical material, optical material obtained from polymerizable composition, and manufacturing method of optical material

The polymerizable composition of the present invention contains (A) an alicyclic isocyanate compound (a1) having two or more functional groups and/or an aliphatic isocyanate compound (a2) having two or more functional groups, (B) a thiol compound having one or more sulfide bonds and/or one or more ester bonds and having two or more functional groups, and (C) an imidazole-based curing catalyst, in which the amount of the imidazole-based curing catalyst (C) is 5 ppm to 3,000 ppm with respect to the total amount of the isocyanate compound (A) and the thiol compound (B).

Polymerizable composition, optical material, and manufacturing method of the same

A (meth)acrylic ester compound represented by the general formula (1) and a dental material containing the compound, 

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Arao, Japan

Kouji Suesugi