Abstract: A chromene compound which develops a color of a neutral tint and has little initial coloration, high double peak characteristic and high color development sensitivity, rarely experiences the reduction of color optical density though it has high fading speed, is excellent in the durability of photochromic properties and can dissolve in a monomer composition which will become a substrate for optical articles in a high concentration, and a photochromic curable composition comprising the chromene compound and polymerizable monomers. The chromene compound is represented by the following formula (1).

Abstract: A chromene compound which develops a color of a neutral tint and has high color optical density, high fading speed and excellent durability and a photochromic curable composition comprising the chromene compound and polymerizable monomers. The chromene compound is represented by the following formula (1). (wherein R1 is an aryl group or heteroaryl group, and R2 is a sulfur-containing substituent selected from the group consisting of thiol group, alkylthio group, alkoxyalkylthio group, haloalkylthio group, cycloalkylthio group, arylthio group and heteroarylthio group.

Abstract: A photochromic curable composition comprising 100 parts by mass of polymerizable monomers which include 70 to 100 mass % of polymerizable monomers having two to four (meth)acrylic groups and 0 to 30 mass % of a polymerizable monomer having one (meth)acrylic group and 0.01 to 20 parts by mass of a photochromic compound, wherein the number of moles of the methacrylic group existent in the polymerizable monomer composition is 3 to 7 times the number of moles of the acrylic group. This composition can provide a lens having a photochromic coating which exhibits excellent photochromic properties, comprises a hard coat layer having sufficiently high adhesion and scratch resistance and has no delay in fading and has excellent storage stability.

Abstract: A photochromic chromene compound which develops a color of a neutral tint, has high color optical density, a high fading speed and high durability, and has an indeno(2,1-f)naphtho(1,2-b)pyran structure represented by the following formula as the basic skeleton, wherein a sulfur-containing substituent selected from thiol group, alkylthio group, alkoxyalkylthio group, haloalkylthio group, cycloalkylthio group, arylthio group and heteroarylthio group is bonded to the 6-position and/or 7-position carbon atom(s).

Abstract: A chromene compound having a skeleton represented by the following formula (1) and exhibiting double peak characteristic: wherein Z is a group represented by any one of the following formulas: n is an integer of 1 to 3, when n is 2 or 3, Z? s may be the same or different, with the proviso that when n is 1, Z cannot be —CH2—, and when n is 2 or 3, Z's cannot be —CH2— at the same time; R1 is an electron absorbing group having a Hammett constant ?p of more than 0, with the proviso that when there are a plurality of R1's, R1's may be the same or different; and X and Y are each independently an oxygen atom or ?NR2, with the proviso that X and Y cannot be oxygen atoms at the same time.

Abstract: A process of producing a urethane (meth)acrylate monomer having a low acid value and a low content of a hardly soluble high-molecular weight impurity which is crosslinked high-dimensionally, comprising the steps of: (1) contacting a first solution containing a urethane (meth)acrylate monomer having an acid value of more than 0.2 mgKOH/g and an organic solvent to a water-containing adsorbent capable of adsorbing an acid component to obtain a second solution containing a urethane (meth)acrylate monomer having an acid value of not more than 0.2 mgKOH/g, the organic solvent and more than 5,000 ppm (mass) of water based on the urethane (meth)acrylate monomer; (2) contacting the second solution to a dehydrating agent to obtain a third solution containing not more than 5,000 ppm (mass) of water based on the urethane (meth)acrylate monomer; and (3) removing the organic solvent from the third solution.

Abstract: A photochromic chromene compound having an indeno(2,1-f)naphtho(1,2-b)pyran structure as its basic skeleton, an aryl group or a heteroaryl group at the 6-position carbon atom of the structure and an electron donor group having a Hammett constant ?p of not more than ?0.1 at the 7-position carbon atom.

Abstract: A chromene compound having a skeleton represented by the following formula (1) and exhibiting double peak characteristic: wherein Z is a group represented by anyone of the following formulas: (R1 is an electron donor group having a Hammett constant ?p of less than ?0.20, with the proviso that when there are a plurality of R1's, R1's may be the same or different, and R2 is a group having a Hammett constant ?p of ?0.

Abstract: A chromene compound which contains a skeleton represented by the following formula (1) and has high color optical density at the time of exposure, double peak characteristic, little initial coloration, a practical fading speed and durability. (wherein R1 is an electron donor group having a Hammett constant of less than 0, the ring including X is a hetero ring formed together with the 7-position and 8-position carbon atoms, and X is an oxygen atom, sulfur atom or group represented by ?NR2 directly bonded to the 7-position carbon atom.

Abstract: A photochromic chromene compound which develops a color of a neutral tint, has high color optical density, a high fading speed and high durability, and has an indeno(2,1-f)naphtho(1,2-b)pyran structure represented by the following formula as the basic skeleton, wherein a sulfur-containing substituent selected from thiol group, alkylthio group, alkoxyalkylthio group, haloalkylthio group, cycloalkylthio group, arylthio group and heteroarylthio group is bonded to the 6-position and/or 7-position carbon atom(s).

Abstract: Disclosed is a chromene compound represented by the following formula (1), wherein R1, R2, R3 and R4 are, respectively, hydrogen atoms, alkyl groups, aryl groups, or the like groups under a condition that at least two of R1 to R4 are not hydrogen atoms, R5, R6, R7 and R8 are, respectively, alkyl groups, aryl groups or the like groups, m and n are, respectively, integers of 0 to 4, and x and y are, respectively, integers of 0 to 5.

Abstract: Disclosed is a photochromic curable composition comprising [A] not less than 0.1 part and less than 5 parts by mass of a specific radically polymerizable monomer having an epoxy group, [B] 1.0 to 15 parts by mass of a specific polyfunctional radically polymerizable monomer, [C] 1.0 to 30.0 parts by mass of a specific di(meth)acrylate monomer, [D] more than 50.0 parts and not more than 97.9 parts by mass of a (meth)acrylate monomer except the components [A] to [C] and/or a thio(meth)acrylate monomer, and [E] 0.001 to 10 parts by mass of a photochromic compound based on 100 parts by mass of the total of the polymerizable monomers.

Abstract: A polymerization curable composition comprising a specific polyfunctional polymerizable monomer having a hard molecular structure with an L-scale Rockwell hardness of its homopolymer of 60 or more, a specific polyfunctional polymerizable monomer and a photochromic compound, a photochromic lens substrate composed of a cured product of the polymerization curable composition, and a lens comprising the photochromic lens substrate. The substrate and lens show excellent photochromic properties such as high color development density and high fading rate, and the cured product has excellent substrate properties such as hardness, heat resistance and impact resistance as well as strength (toughness) that allows for its use in rimless spectacles.

Abstract: A chromene compound represented by the following formula (1), wherein, “A” is an annulated ring, R1 and R2 are hydrogen atoms, hydroxyl groups or the like groups, R3, R4, R5 and R6 are substituents such as hydroxyl groups or the like groups, “a” and “b” are, respectively, integers of 0 to 4, and “c” and “d” are, respectively, integers of 0 to 5. The chromene compound is a photochromic compound developing a color of a neutral tint, and has a high color density per a unit amount.

Abstract: A chromene compound represented by the following formula (1), wherein, “A” is an annulated ring, R1 and R2 are hydrogen atoms, hydroxyl groups or the like groups, R3, R4, R5 and R6 are substituents such as hydroxyl groups or the like groups, “a” and “b” are, respectively, integers of 0 to 4, and “c” and “d” are, respectively, integers of 0 to 5. The chromene compound is a photochromic compound developing a color of a neutral tint, and has a high color density per a unit amount.

Abstract: A photochromic curable composition comprising [A] not less than 0.1 part and less than 5 parts by mass of a specific radically polymerizable monomer having an epoxy group, [B] 1.0 to 15 parts by mass of a specific polyfunctional radically polymerizable monomer, [C] 1.0 to 30.0 parts by mass of a specific di(meth)acrylate monomer, [D] more than 50.0 parts and not more than 97.9 parts by mass of a (meth)acrylate monomer except the components [A] to [C] and/or a thio(meth)acrylate monomer, and [E] 0.001 to 10 parts by mass of a photochromic compound based on 100 parts by mass of the total of the polymerizable monomers. The photochromic curable composition can provide a photochromic cured product having excellent photochromic properties for a long time and high mechanical strength, and the photochromic cured product can be manufactured from the photochromic curable composition at a low cost.

Abstract: A chromene compound represented by the following formula (1), wherein R1, R2, R3 and R4 are, respectively, hydrogen atoms, alkyl groups, aryl groups, or the like groups under a condition that at least two of R1 to R4 are not hydrogen atoms, R5, R6, R7 and R8 are, respectively, alkyl groups, aryl groups or the like groups, m and n are, respectively, integers of 0 to 4, and x and y are, respectively, integers of 0 to 5. The compound has a basic structure in which a 6-membered ring is condensed in a form of shearing a carbon atom at the fifth position and a carbon atom at the sixth position of a 2H-benzo[h]chromene skeleton. Owing to this molecular structure, the chromene compound of the invention develops a yellow color or a neutral tint by itself, exhibits favorable photochromic properties, and does not exhibit deteriorated photochromic properties even when it is used in combination with a photopolymerization initiator.

Abstract: The present invention discloses a curable polycyclic compound represented by the following formula (1): {wherein A is a di- to hexa-valent group derived from a polycyclic hydrocarbon compound; R1 is an alkyl group of 1 to 4 carbon atoms, a perfluoroalkyl group of 1 to 4 carbon atoms, or a fluorine atom; n is an integer of 0 to 2; m is an integer of 2 to 4; and Y is a group represented by the following formula (2) or (3): (wherein R2, R3, R5 and R6 are each independently a hydrogen atom, a fluorine atom or an alkyl group of 1 to 4 carbon atoms; R4 is a methyl group or an ethyl group; and p and q are each independently an integer of 0 to 4)}.

Abstract: 1-aryl-3,4-dihydro-1H-naphthalene-2-one is prepared by isomerizing an epoxy compound represented by the following general formula, wherein a is an integer of 0 to 5, b is an integer of 0 to 4, and R1 to R6 are hydrogen atoms or substituents such as alkyl groups, in an organic solvent in the presence of magnesium sulfate. This process makes it possible to prepare the 1-aryl-3,4-dihydro-1H-naphthalene-2-one safely and in a high yield without using highly explosive compounds such as lithium perchlorate.

Abstract: 1-aryl-3,4-dihydro-1H-naphthalene-2-one is prepared by isomerizing an epoxy compound represented by the following general formula, wherein a is an integer of 0 to 5, b is an integer of 0 to 4, and R1 to R6 are hydrogen atoms or substituents such as alkyl groups, in an organic solvent in the presence of magnesium sulfate. This process makes it possible to prepare the 1-aryl-3,4-dihydro-1H-naphthalene-2-one safely and in a high yield without using highly explosive compounds such as lithium perchlorate.