Patents by Inventor Rihoko Imai
Rihoko Imai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 5952477Abstract: The present invention is concerned with a novel azo compound represented by formula (1), (2) or (3), a water-soluble dye comprising this azo compound, and a polarizing film containing this azo compound. The obtained polarizing film has high hydrothermoresistance and a high polarization degree and is excellent in optical characteristics: ##STR1## wherein each of the groups is defined.Type: GrantFiled: October 15, 1997Date of Patent: September 14, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
-
Patent number: 5751483Abstract: The present invention relates to a color filter having polarizability, which comprises a dye having a spectral transmissibility, a dichroic dye having a polarizability, corresponding to the former dye and a base resin. The filter can be produced by coating and fixing the former dye on a monochromatic polarizing film produced by using the dichroic dye; mixing the former dye, the dichroic dye and the base resin, melting and extruding the mixture to produce a film and monoaxially stretching the film; dyeing a transparent film with the former dye and the dichroic dye and then monoaxially stretching the dyed film; or dyeing a transparent monoaxially stretched film with the former dye and the dichroic dye.Type: GrantFiled: August 1, 1995Date of Patent: May 12, 1998Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Hisato Itoh, Tsutami Misawa, Akira Ogiso, Rihoko Imai
-
Patent number: 5750599Abstract: Novel quinophthalone compounds, which are represented by the following formula (1): ##STR1## R.sub.1 -R.sub.5 each independently represents a hydrogen or halogen atom or a hydroxy, linear or branched alkyl, substituted or unsubstituted cycloalkyl, halogenated alkyl, alkoxyalkyl, alkoxy, nitro, amino, alkylamino, carboxyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonylamino, alkylcarbonyloxy or cyano group; R.sub.6 -R.sub.17 each independently represents a hydrogen or halogen atom or a hydroxyl, alkyl, halogenated alkyl, alkoxy, nitro, amino, alkylamino, carboxyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyloxy or cyano group; m and n each stands for 0 or 1; and A represents a substituent, are yellow orange dyestuffs suitable for polarizing films.Type: GrantFiled: March 19, 1997Date of Patent: May 12, 1998Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Akira Ogiso, Rihoko Imai, Tsutami Misawa, Ryu Oi, Yoriaki Matsuzaki, Hisato Itoh
-
Patent number: 5739298Abstract: Novel azo compounds having the specific structural formula (1) or (3) set out below, water-soluble dyes containing the compounds, and polarizing films containing the water-soluble dyes: ##STR1## wherein R.sub.1 represents a hydrogen or halogen atom or a hydroxyl, C.sub.1-2 alkyl, C.sub.1-2 alkoxyl, C.sub.1-2 acylamino, cyano, carboxyl or sulfonic acid group; R.sub.3 and R.sub.8 individually represent a hydrogen atom or a hydroxyl, C.sub.1-2 alkyl or C.sub.1-2 alkoxyl group; R.sub.2 and R.sub.4 individually represent a hydrogen atom or a hydroxyl, C.sub.1-2 alkyl, C.sub.1-2 alkoxyl or C.sub.1-2 acylamino group; R.sub.5 represents a hydrogen atom or a carboxyl or C.sub.1-2 alkoxyl group; R.sub.6 represents a hydrogen atom, a hydroxyl, amino, methylamino, .beta.-hydroxyethylamino or C.sub.1-2 acylamino group, or a phenylamino or benzoylamino group which the phenyl nucleus may be substituted by one or more nitro, amino, hydroxyl, C.sub.1-2 alkyl, carboxyl and/or sulfonic acid groups and/or chlorine atoms; R.sub.Type: GrantFiled: June 5, 1996Date of Patent: April 14, 1998Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
-
Patent number: 5698682Abstract: The present invention provides a polarizing film having high heat resistance and a high degree of polarization and excellent optical properties by dyeing a polymer film with a novel azo compound represented by the following formula (1) or (2): ##STR1##Type: GrantFiled: February 18, 1997Date of Patent: December 16, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoriaki Matsuzaki, Ryu Oi, Rihoko Imai, Keisuke Takuma, Hisato Itoh
-
Patent number: 5659039Abstract: Novel quinophthalone compounds, which are represented by the following formula (1): ##STR1## R.sub.1 -R.sub.5 each independently represents a hydrogen or halogen atom or a hydroxy, linear or branched alkyl, substituted or unsubstituted cycloalkyl, halogenated alkyl, alkoxyalkyl, alkoxy, nitro, amino, alkylamino, carboxyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonylamino, alkylcarbonyloxy or cyano group; R.sub.6 -R.sub.17 each independently represents a hydrogen or halogen atom or a hydroxyl, alkyl, halogenated alkyl, alkoxy, nitro, amino, alkylamino, carboxyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkylcarbonyloxy or cyano group; m and n each stands for 0 or 1; and A represents a substituent, are yellow orange dyestuffs suitable for polarizing films.Type: GrantFiled: February 23, 1995Date of Patent: August 19, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Akira Ogiso, Rihoko Imai, Tsutami Misawa, Ryu Oi, Yoriaki Matsuzaki, Hisato Itoh
-
Patent number: 5639809Abstract: The present invention provides a polarizing film having high heat resistance and a high degree of polarization and excellent optical properties by dyeing a polymer film with a novel azo compound represented by the following formula (1) or (2): ##STR1##Type: GrantFiled: June 14, 1995Date of Patent: June 17, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoriaki Matsuzaki, Ryu Oi, Rihoko Imai, Keisuke Takuma, Hisato Itoh
-
Patent number: 5618868Abstract: The present invention is concerned with a novel azo compound represented by formula (1), (2) or (3), a water-soluble dye comprising this azo compound, and a polarizing film containing this azo compound. The obtained polarizing film has high hydrothermoresistance and a high polarization degree and is excellent in optical characteristics: ##STR1## wherein each of R.sub.1, R.sub.3 and R.sub.12 is independently a hydrogen atom, halogen atom, hydroxyl group, alkyl group having 1 or 2 carbon atoms, or alkoxy group having 1 or 2 carbon atoms; each of R.sub.2, R.sub.4, R.sub.8 and R.sub.9 is independently a hydrogen atom, hydroxyl group, alkyl group having 1 or 2 carbon atoms, alkoxy group having 1 or 2 carbon atoms, or acetylamino group; R.sub.5 is a hydroxyl group or amino group at the o-position or p-position to the azo group; each of R.sub.6 and R.sub.10 is a hydrogen atom, carboxyl group, or alkoxy group having 1 or 2 carbon atoms; each of R.sub.7 and R.sub.Type: GrantFiled: April 6, 1994Date of Patent: April 8, 1997Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
-
Patent number: 5548073Abstract: Novel azo compounds having the specific structural formula (1) or (3) set out below, water-soluble dyes containing the compounds, and polarizing films containing the water-soluble dyes: ##STR1## wherein R.sub.1 represents a hydrogen or halogen atom or a hydroxyl, C.sub.1-2 alkyl, C.sub.1-2 alkoxyl, C.sub.1-2 acylamino, cyano, carboxyl or sulfonic acid group; R.sub.3 and R.sub.8 individually represent a hydrogen atom or a hydroxyl, C.sub.1-2 alkyl or C.sub.1-2 alkoxyl group; R.sub.2 and R.sub.4 individually represent a hydrogen atom or a hydroxyl, C.sub.1-2 alkyl, C.sub.1-2 alkoxyl or C.sub.1-2 acylamino group; R.sub.5 represents a hydrogen atom or a carboxyl or C.sub.1-2 alkoxyl group; R.sub.6 represents a hydrogen atom, a hydroxyl, amino, methylamino, .beta.-hydroxyethylamino or C.sub.1-2 acylamino group, or a phenylamino or benzoylamino group which the phenyl nucleus may be substituted by one or more nitro, amino, hydroxyl, C.sub.1-2 alkyl, carboxyl and/or sulfonic acid groups and/or chlorine atoms; R.sub.Type: GrantFiled: March 15, 1995Date of Patent: August 20, 1996Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
-
Patent number: 5482986Abstract: A 2H-1-benzopyran-2-on compound represented by the formula (1): ##STR1## and a colorless ultraviolet absorber consisting of the compound, and a thermoplastic resin composition and formed article comprising said ultraviolet absorber. The compound can provide a thermoplastic resin composition and a formed article of the composition having excellent heat stability and sublimation resistance, comprise a non-coloring ultraviolet absorber, and are excellent in ultraviolet barrier property.Type: GrantFiled: July 11, 1994Date of Patent: January 9, 1996Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Akira Ogiso, Tsutami Misawa, Rihoko Imai, Hisato Itoh
-
Patent number: 5446135Abstract: Dyes having the specific structural formula (1) set out below, their copper salt dyes, water-soluble azo dyes containing the dyes or the copper salt dyes, and polarizing films containing the water-soluble azo dyes: ##STR1## wherein A means a benzene or naphthalene ring having a sulfone group or a base thereof, Y and Z individually denote a group of the following formula (a); ##STR2## wherein R.sup.2 is a hydrogen atom, a methyl group, a methoxyl group or an ethoxyl group and R.sup.3 is a methyl, methoxyl or ethoxyl group,R.sup.1 represents an amino, C.sub.1-4 alkylamino, C.sub.2-4 alkylcarboxyamino, benzoylamino or phenylamino group bonded to the 6 or 7 position of the naphthalene ring, and X denotes a hydrogen, sodium, potassium or lithium atom, with the proviso that Y and Z are different but, when both R.sup.2 s are hydrogen atoms and both R.sup.3 s are methoxyl groups, Y and Z may be the same.Type: GrantFiled: March 14, 1994Date of Patent: August 29, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
-
Patent number: 5423100Abstract: Novel azo compounds having the specific structural formula (1) or (3) set out below, water-soluble dyes containing the compounds, and polarizing films containing the water-soluble dyes: ##STR1## wherein R.sub.1 represents a hydrogen or halogen atom or a hydroxyl, C.sub.1-2 alkyl, C.sub.1-2 alkoxy, C.sub.1-2 acylamino, cyano, carboxyl or sulfonic acid group; R.sub.3 and R.sub.8 individually represent a hydrogen atom or a hydroxyl, C.sub.1-2 alkyl or C.sub.1-2 alkoxy group; R.sub.2 and R.sub.4 individually represent a hydrogen atom or a hydroxyl, C.sub.1-2 alkyl, C.sub.1-2 alkoxy or C.sub.1-2 acylamino group; R.sub.5 represents a hydrogen atom or a carboxyl or C.sub.1-2 alkoxy group; R.sub.6 represents a hydrogen atom, a hydroxyl, amino, methylamino, .beta.-hydroxyethylamino or C.sub.1-2 acylamino group, or a phenylamino or benzoylamino group which the phenyl nucleus may be substituted by one or more nitro, amino, hydroxyl, C.sub.1-2 alkyl, carboxyl and/or sulfonic acid groups and/or chlorine atoms; R.sub.Type: GrantFiled: July 23, 1993Date of Patent: June 13, 1995Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh
-
Patent number: 5318856Abstract: Dyes having the specific structural formula (1) set out below, their copper salt dyes, water-soluble azo dyes containing the dyes or the copper salt dyes, and polarizing films containing the water-soluble azo dyes: ##STR1## wherein A means a benzene or naphthalene ring having a sulfone group or a base thereof, Y and Z individually denote a group of the following formula (a): ##STR2## wherein R.sup.2 is a hydrogen atom, a methyl group, a methoxyl group or an ethoxyl group and R.sup.3 is a methyl, methoxyl or ethoxyl group, R.sup.1 represents an amino, C.sub.1-4 alkylamino, C.sub.2-4 alkylcarboxyamino, benzoylamino or phenylamino group bonded to the 6 or 7 position of the naphthalene ring, and X denotes a hydrogen, sodium, potassium or lithium atom, with the proviso that Y and Z are different but, when both R.sup.2 s are hydrogen atoms and both R.sup.3 s are methoxyl groups, Y and Z may be the same.Type: GrantFiled: December 24, 1992Date of Patent: June 7, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Tsutami Misawa, Akira Ogiso, Rihoko Imai, Hisato Itoh