Patents Assigned to Kawasaki Kasei Chemicals Ltd.
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Patent number: 11958802Abstract: A photopolymerization sensitizer may not cause problems of dusting or coloring of a cured product due to bleeding of additives such as the photopolymerization sensitizer on the surface, e.g., by blooming at the time of photo-curing or during storage of the cured product, and which provides a practically sufficient photo-curing rate. A 9,10-bis(alkoxycarbonylalkyleneoxy)anthracene compound having ester groups, of formula (I): wherein A is a C1-20 alkylene group, optionally branched by an alkyl group, R is a C1-20 alkyl group, optionally branched by the alkyl group, the C1-20 alkyl group optionally being a cycloalkyl group or a cycloalkylalkyl group, and X and Y are independently a hydrogen, a C1-8 alkyl group, or a halogen.Type: GrantFiled: March 29, 2019Date of Patent: April 16, 2024Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Akihiko Yamada, Hidehiko Tanaka, Shigeaki Numata
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Patent number: 11613509Abstract: A conventional polymerization inhibitor is for example an agent to scavenge radicals generated during storage of a radical polymerizable compound and used to stably handle the radical polymerizable compound, but is unnecessary when the radical polymerizable compound is to be subjected to radical polymerization reaction, and is preferably removed at the time of the radical polymerization reaction. The object of the present invention is to obviate inconvenience of removing the polymerization inhibitor at the time of radical polymerization. The radical polymerization control agent contained in a radical polymerizable composition of the present invention functions as a radical polymerization inhibitor for example stored in a dark place, but loses its radical polymerization inhibiting effect when polymerization is initiated while being irradiated with light at a certain specific wavelength at the time of polymerization.Type: GrantFiled: June 27, 2018Date of Patent: March 28, 2023Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Shunichi Himori, Keita Iuchi
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Patent number: 11420928Abstract: To provide a photopolymerization sensitizer which will not cause problems of dusting or coloring of a cured product by bleeding of additives such as the photopolymerization sensitizer on the surface e.g. by blooming at the time of photo-curing or during storage of the cured product, and which imparts a practically sufficient photo-curing rate. An oligomer of a 9,10-bis(substituted oxy)anthracene compound having repeating units represented by the following formula (1): wherein n represents a repetition number and is from 2 to 50, each of X and Y which may be the same or different, is a hydrogen atom, a C1-8 alkyl group or a halogen atom, and A is a bivalent substituent.Type: GrantFiled: May 15, 2018Date of Patent: August 23, 2022Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Akihiko Yamada, Shuji Yokoyama, Shigeaki Numata, Tatsuki Takeuchi
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Patent number: 11352450Abstract: The purpose of the present invention is to provide a photopolymerizable composition which can act as a photopolymerization sensitizer that is active against light having a wavelength falling within a wavelength range of from 300 to 500 nm, and which has such a property that coloring of a cured product produced by polymerizing a photopolymerizable composition containing the photopolymerization sensitizer is less. A photopolymerization sensitizer composition characterized by comprising a photopolymerization sensitizer containing an alkoxyanthracene compound represented by the formula (1) and a singlet oxygen quencher; and a photopolymerizable composition containing the photopolymerization sensitizer composition: in the formula (1), n represents an integer of 1 or 2; R represents a C1-12 alkyl group; and X represents a hydrogen atom or a C1-8 alkyl group.Type: GrantFiled: April 16, 2019Date of Patent: June 7, 2022Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Shunichi Himori, Keita Iuchi
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Publication number: 20220127385Abstract: A radical polymerization method may use a compound having a polycyclic aromatic skeleton and an endoperoxide compound having a polycyclic aromatic skeleton. An endoperoxide compound may have a polycyclic aromatic skeleton of formula (1), and a compound may have a polycyclic aromatic skeleton, which is a raw material of the endoperoxide compound: wherein R is a C1-10 alkyl group, an alkoxymethyl group having a C1-5 alkoxy group, a C6-10 aryl group, an alkylcarbonyl group having a C1-10 alkyl group, an arylcarbonyl group having a C6-20 aryl group, an alkyloxycarbonyl group having a C1-10 alkyl group, an aryloxycarbonyl group having a C6-10 aryl group, an alkyloxycarbonylmethyl group having a C1-12 alkyl group or an aryloxycarbonylmethyl group having a C6-12 aryl group.Type: ApplicationFiled: February 12, 2019Publication date: April 28, 2022Applicants: Kawasaki Kasei Chemicals Ltd., National University Corporation YOKOHAMA National UniversityInventors: Shunichi HIMORI, Keita IUCHI, Akihiko YAMADA, Hiroaki GOTOH, Kazuhisa SAKAKIBARA
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Publication number: 20220106254Abstract: A photopolymerization sensitizer may not cause problems of dusting or coloring of a cured product due to bleeding of additives such as the photopolymerization sensitizer on the surface, e.g., by blooming at the time of photo-curing or during storage of the cured product, and which provides a practically sufficient photo-curing rate. A 9,10-bis(alkoxycarbonylalkyleneoxy)anthracene compound having ester groups, of formula (I): wherein A is a C1-20 alkylene group, optionally branched by an alkyl group, R is a C1-20 alkyl group, optionally branched by the alkyl group, the C1-20 alkyl group optionally being a cycloalkyl group or a cycloalkylalkyl group, and X and Y are independently a hydrogen, a C1-8 alkyl group, or a halogen.Type: ApplicationFiled: March 29, 2019Publication date: April 7, 2022Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Akihiko YAMADA, Hidehiko TANAKA, Shigeaki NUMATA
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Patent number: 11149103Abstract: To provide a photopolymerizable composition which can be quickly cured by light of from 300 nm to 450 nm, and a cured product of which is less colored. A photopolymerization sensitizer composition containing a compound represented by the following formula (1) and a compound, of which the maximum value of an absorption coefficient in a wavelength region ranging from at least 400 nm to at most 500 nm is higher than the maximum value of an absorption coefficient in a wavelength region ranging from at least 400 nm to at most 500 nm of said compound; and a photopolymerizable composition containing the photopolymerization sensitizer composition.Type: GrantFiled: April 24, 2017Date of Patent: October 19, 2021Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Shigeaki Numata, Shuji Yokoyama, Yasuaki Miki, Akihiko Yamada
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Publication number: 20210122692Abstract: A conventional polymerization inhibitor is for example an agent to scavenge radicals generated during storage of a radical polymerizable compound and used to stably handle the radical polymerizable compound, but is unnecessary when the radical polymerizable compound is to be subjected to radical polymerization reaction, and is preferably removed at the time of the radical polymerization reaction. The object of the present invention is to obviate inconvenience of removing the polymerization inhibitor at the time of radical polymerization. The radical polymerization control agent contained in a radical polymerizable composition of the present invention functions as a radical polymerization inhibitor for example stored in a dark place, but loses its radical polymerization inhibiting effect when polymerization is initiated while being irradiated with light at a certain specific wavelength at the time of polymerization.Type: ApplicationFiled: June 27, 2018Publication date: April 29, 2021Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Shunichi HIMORI, Keita IUCHI
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Publication number: 20210079127Abstract: [OBJECT] The purpose of the present invention is to provide a photopolymerizable composition which can act as a photopolymerization sensitizer that is active against light having a wavelength falling within a wavelength range of from 300 to 500 nm, and which has such a property that coloring of a cured product produced by polymerizing a photopolymerizable composition containing the photopolymerization sensitizer is less. [SOLUTION TO PROBLEM] A photopolymerization sensitizer composition characterized by comprising a photopolymerization sensitizer containing an alkoxyanthracene compound represented by the formula (1) and a singlet oxygen quencher; and a photopolymerizable composition containing the photopolymerization sensitizer composition: in the formula (1), n represents an integer of 1 or 2; R represents a C1-12 alkyl group; and X represents a hydrogen atom or a C1-8 alkyl group.Type: ApplicationFiled: April 16, 2019Publication date: March 18, 2021Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Shunichi HIMORI, Keita IUCHI
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Publication number: 20200062692Abstract: To provide a photopolymerization sensitizer which will not cause problems of dusting or coloring of a cured product by bleeding of additives such as the photopolymerization sensitizer on the surface e.g. by blooming at the time of photo-curing or during storage of the cured product, and which imparts a practically sufficient photo-curing rate. An oligomer of a 9,10-bis(substituted oxy)anthracene compound having repeating units represented by the following formula (1): wherein n represents a repetition number and is from 2 to 50, each of X and Y which may be the same or different, is a hydrogen atom, a C1-8 alkyl group or a halogen atom, and A is a bivalent substituent.Type: ApplicationFiled: May 15, 2018Publication date: February 27, 2020Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Akihiko YAMADA, Shuji YOKOYAMA, Shigeaki NUMATA, Tatsuki TAKEUCHI
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Patent number: 10570227Abstract: To provide a photopolymerizable composition which can be quickly cured by light of from 300 nm to 500 nm, and a cured product of which is less colored. A photopolymerizable composition comprising a compound having an anthracene skeleton represented by the following formula (1), a compound having a benzophenone skeleton and a radical polymerizable compound: wherein each of R1 and R2 which may be the same or different, is a C1-20 alkyl group, a C6-20 aryl group, an alkylcarbonyl group having a C1-20 alkyl group, an arylcarbonyl group having a C6-20 aryl group, an alkyloxycarbonyl group having a C1-20 alkyl group, or an aryloxycarbonyl group having a C6-20 aryl group, and each of X and Y which may be the same or different, is a hydrogen atom or a C1-8 alkyl group.Type: GrantFiled: September 13, 2016Date of Patent: February 25, 2020Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Shigeaki Numata, Shuji Yokoyama, Yasuaki Miki, Akihiko Yamada
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Publication number: 20190119426Abstract: To provide a photopolymerizable composition which can be quickly cured by light of from 300 nm to 450 nm, and a cured product of which is less colored. A photopolymerization sensitizer composition containing a compound represented by the following formula (1) and a compound, of which the maximum value of an absorption coefficient in a wavelength region ranging from at least 400 nm to at most 500 nm is higher than the maximum value of an absorption coefficient in a wavelength region ranging from at least 400 nm to at most 500 nm of said compound; and a photopolymerizable composition containing the photopolymerization sensitizer composition.Type: ApplicationFiled: April 24, 2017Publication date: April 25, 2019Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Shigeaki NUMATA, Shuji YOKOYAMA, Yasuaki MIKI, Akihiko YAMADA
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Publication number: 20180208689Abstract: To provide a photopolymerizable composition which can be quickly cured by light of from 300 nm to 500 nm, and a cured product of which is less colored. A photopolymerizable composition comprising a compound having an anthracene skeleton represented by the following formula (1), a compound having a benzophenone skeleton and a radical polymerizable compound: wherein each of R1 and R2 which may be the same or different, is a C1-20 alkyl group, a C6-20 aryl group, an alkylcarbonyl group having a C1-20 alkyl group, an arylcarbonyl group having a C6-20 aryl group, an alkyloxycarbonyl group having a C1-20 alkyl group, or an aryloxycarbonyl group having a C6-20 aryl group, and each of X and Y which may be the same or different, is a hydrogen atom or a C1-8 alkyl group.Type: ApplicationFiled: September 13, 2016Publication date: July 26, 2018Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Shigeaki NUMATA, Shuji YOKOYAMA, Yasuaki MIKI, Akihiko YAMADA
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Patent number: 7279607Abstract: An industrially advantageous process is presented whereby a high purity anthracene diether can be produced in good yield. An aqueous medium containing an alkali salt of 9,10-anthracenediol is added to an organic solvent containing an etherifying agent in the presence or absence of a quaternary ammonium compound or a quaternary phosphonium compound, to carry out the etherifying reaction to produce the anthracene diether.Type: GrantFiled: December 19, 2002Date of Patent: October 9, 2007Assignee: Kawasaki Kasei Chemicals Ltd.Inventors: Hiroyuki Honda, Hiroki Nakano, Shigeaki Numata
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Patent number: 7056418Abstract: A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calculated as a standard oxidation-reduction potential (Ea) with a hydrogen ion activity of 1, is within a range of from 0.12 to 0.25V to the standard hydrogen electrode potential. It is thereby possible to cook the lignocellulose material with a low Kappa number and in good yield and at the same time, to reduce the amount of the chemical solution used and to reduce the load on a recovery boiler.Type: GrantFiled: December 17, 2001Date of Patent: June 6, 2006Assignees: Kawasaki Kasei Chemicals Ltd., Nippon Paper Industries Co., Ltd.Inventors: Tatsuya Andoh, Junji Tanaka, Keigo Watanabe, Yasunori Nanri, Makoto Nakao
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Patent number: 6638356Abstract: A gypsum-based building material comprising gypsum as the main material and an anthraquinone compound incorporated.Type: GrantFiled: February 8, 2002Date of Patent: October 28, 2003Assignees: Kawasaki Kasei Chemicals Ltd., Yoshino Gypsum Co., Ltd.Inventors: Yoshiaki Ishibashi, Itaru Yokoyama, Masanobu Seki
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Publication number: 20030150363Abstract: A gypsum-based building material comprising gypsum as the main material and an anthraquinone compound incorporated.Type: ApplicationFiled: February 8, 2002Publication date: August 14, 2003Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Yoshiaki Ishibashi, Itaru Yokoyama, Masanobu Seki
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Patent number: 6585880Abstract: In a process for producing kraft pulp, the process is made closed, the yield of pulp is improved and environmental problems are minimized. An alkaline solution containing Na2S which flows in a process of producing kraft pulp, is electrolyzed by an electrolytic oxidation method; a liquid which is formed at an anode side and contains a polysulfide type sulfur in an amount of 6 g/l or more, is added, as it is or after being causticized, to the process before a chip has the maximum temperature, and a NaOH solution formed at a cathode side, is added to at least one step of the process after the chip has the maximum temperature till a final bleaching stage; and at least chemicals in the step wherein NaOH is added, among chemicals discharged in all steps from a cooking step till the final bleaching stage, are recovered and reused.Type: GrantFiled: November 28, 2001Date of Patent: July 1, 2003Assignees: Nippon Paper Industries Co., Ltd., Kawasaki Kasei Chemicals Ltd.Inventors: Keigo Watanabe, Yasunori Nanri, Kazuaki Sakai, Tatsuya Andoh, Makoto Nakao
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Patent number: 6517699Abstract: The present invention has an object to obtain a cooking liquor containing polysulfide-sulfur at a high concentration by minimizing by-production of thiosulfate ions. The present invention is a method for producing polysulfides, which comprises introducing a solution containing sulfide ions into an anode compartment of an electrolytic cell comprising the anode compartment provided with a porous anode, a cathode compartment provided with a cathode, and a diaphragm partitioning the anode compartment and the cathode compartment, for electrolytic oxidation to obtain polysulfide ions, characterized in that the porous anode is disposed so that a space is provided at least partly between the porous anode and the diaphragm, and the apparent volume of the porous anode is from 60% to 99% based on the volume of the anode compartment.Type: GrantFiled: August 27, 2001Date of Patent: February 11, 2003Assignees: Asahi Glass Company, Limited, Kawasaki Kasei Chemicals Ltd., Nippon Paper Industries Co., Ltd.Inventors: Tetsuji Shimohira, Tatsuya Andoh, Junji Tanaka, Keigo Watanabe, Yasunori Nanri
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Publication number: 20020088576Abstract: A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calculated as a standard oxidation-reduction potential (Ea) with a hydrogen ion activity of 1, is within a range of from 0.12 to 0.25V to the standard hydrogen electrode potential. It is thereby possible to cook the lignocellulose material with a low Kappa number and in good yield and at the same time, to reduce the amount of the chemical solution used and to reduce the load on a recovery boiler.Type: ApplicationFiled: December 17, 2001Publication date: July 11, 2002Applicant: Kawasaki Kasei Chemicals Ltd.Inventors: Tatsuya Andoh, Junji Tanaka, Keigo Watanabe, Yasunori Nanri, Makoto Nakao