Patents by Inventor Akitsugu Fujiwara
Akitsugu Fujiwara 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).
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Publication number: 20230250287Abstract: A two-component type room temperature fast-curing organopolysiloxane composition which is a room temperature curing organopolysiloxane composition of a two-component and dealcohol type and which comprises, as curing agents, a first agent containing a hydrolyzable organosilane compound represented by formula (3) and/or a partially hydrolyzed condensation product thereof and a second agent containing a curing catalyst. This composition has particularly excellent fast-curing properties and deep-curing properties and provides a cured product having both high storage stability and high durability. (R6 represents an unsubstituted or substituted monovalent hydrocarbon group having 1-20 carbon atoms; R7 represents an unsubstituted or substituted alkyl group having 1-20 carbon atoms or an unsubstituted or substituted cycloalkyl group having 3-20 carbon atoms; and a is from 1 to 3.Type: ApplicationFiled: July 1, 2021Publication date: August 10, 2023Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Takahiro YAMAGUCHI, Akitsugu FUJIWARA, Tokuo SATOU
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Publication number: 20230146278Abstract: A room-temperature-curable organopolysiloxane composition comprising (A) an organopolysiloxane resin which contains silanol groups in a specified amount and has a specified molecular weight and a specified three-dimensional net-like structure, (B) a hydrolyzable organosilane compound containing an organooxymethyl group and/or a partial hydrolysis-condensation product thereof, (C) a linear diorganopolysiloxane of which each molecule chain terminal is capped with a silanol group, and (D) a hydrolyzable to organosilane containing an amino group and/or a partial hydrolysis-condensation product thereof at specified content ratios can be produced easily and at low cost, and can be formed into a high-hardness cured article or coating film even when a metal compound that can serve as a condensation catalyst is not contained.Type: ApplicationFiled: April 2, 2021Publication date: May 11, 2023Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Shigeki YASUDA
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Publication number: 20230096128Abstract: Through the present invention, by undergoing a step in which a straight-chain diorganopolysiloxane having silanol groups at both terminal ends of the molecular chain thereof, a hydrolyzable silane and/or a partial hydrolysis condensate thereof having a hydrolyzable group capable of detaching a lactic acid ester, and an amino-group-containing hydrolyzable organosilane and/or a partial hydrolysis condensate thereof are pre-mixed/reacted in advance and silanol groups at both terminal ends of the molecular chain of a main agent (base polymer) are blocked by specific hydrolyzable silyl groups, it is possible to manufacture a lactic-acid-ester-type room-temperature-curable organopolysiloxane composition excellent in all characteristics including curability, adhesive properties, workability, and the like that were not attainable by the conventional lactic-acid-ester-type room-temperature curable (RTV) silicone rubber composition.Type: ApplicationFiled: October 21, 2022Publication date: March 30, 2023Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Takafumi SAKAMOTO
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Patent number: 11525057Abstract: Through the present invention, by undergoing a step in which a straight-chain diorganopolysiloxane having silanol groups at both terminal ends of the molecular chain thereof, a hydrolyzable silane and/or a partial hydrolysis condensate thereof having a hydrolyzable group capable of detaching a lactic acid ester, and an amino-group-containing hydrolyzable organosilane and/or a partial hydrolysis condensate thereof are pre-mixed/reacted in advance and silanol groups at both terminal ends of the molecular chain of a main agent (base polymer) are blocked by specific hydrolyzable silyl groups, it is possible to manufacture a lactic-acid-ester-type room-temperature-curable organopolysiloxane composition excellent in all characteristics including curability, adhesive properties, workability, and the like that were not attainable by the conventional lactic-acid-ester-type room-temperature curable (RTV) silicone rubber composition.Type: GrantFiled: September 21, 2018Date of Patent: December 13, 2022Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu Fujiwara, Takafumi Sakamoto
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Publication number: 20220227996Abstract: A room-temperature-vulcanizing (RTV) silicone rubber composition having an organopolysiloxane having a hydrolyzable silyl group at the molecular chain end as a base component (base polymer), used in combination with a lactate silane capable of eliminating a lactic acid ester as a crosslinking agent, and blended with a predetermined curing accelerator, etc. can give a cured product (silicone rubber) that exhibits good moisture resistance as well as excellent safety, adhesiveness, curability, and low odor.Type: ApplicationFiled: April 24, 2020Publication date: July 21, 2022Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Takafumi SAKAMOTO
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Publication number: 20220098371Abstract: An organopolysiloxane modified with a lactate silyl at both ends according to the present invention, which is represented by general formula (1) (wherein each of R1, R2 and R3 independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1-10 carbon atoms; m represents an integer of 10 or more; each a independently represents 2 or 3; and X represents an alkylene group having 2-4 carbon atoms or an oxygen atom), is useful as a starting material siloxane for a surface treatment agent for inorganic materials, a coating agent for water repellent treatments, and especially for a room-temperature curable (RTV) silicone rubber composition.Type: ApplicationFiled: March 26, 2020Publication date: March 31, 2022Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Misaki TAKAI, Akitsugu FUJIWARA, Takafumi SAKAMOTO
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Patent number: 11274225Abstract: Room temperature-vulcanizing silane-containing resin compositions are described, containing: (A) 100 parts by mass of a silane-modified polybutadiene compound represented by formula (1) (B) 0.5 to 20 parts by mass of a hydrolyzable organosilane compound having in each molecule an average of at least two silicon atom-bonded hydrolyzable groups, and/or the partial hydrolysis condensate of this hydrolyzable organosilane compound; and (C) 0.1 to 10 parts by mass of a curing catalyst. This room temperature-vulcanizing silane-containing resin composition is suitable for application as a coating agent composition and in particular as, e.g., a coating agent for electrical and electronic components and substrates therefor, and a sealant for liquid crystal display elements. The room temperature-vulcanizing silane-containing resin composition provides a gas permeation-resistant coating film (cured material) and is useful as a coating agent that exhibits a corrosion-inhibiting capability versus corrosive gases.Type: GrantFiled: December 22, 2017Date of Patent: March 15, 2022Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu Fujiwara, Munenao Hirokami
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Publication number: 20210301066Abstract: This room-temperature-curable polybutadiene resin composition contains: (A) a urethane oligomer comprising a condensation polymer of (A1) a polybutadiene having an OH group at both ends of the molecular chain and (A2) a diisocyanate compound; (B) a hydrolysable organosilane compound which, in one molecule, has on average two or more hydrolysable groups bonded to a silicon atom and does not have three or more nitrogen atoms, and/or a partially hydrolysed condensate of said compound; (C) a condensation reaction catalyst; and (D) a hydrolysable organosilane compound which, in one molecule, has three or more nitrogen atoms, and/or a partially hydrolysed condensate of said compound. Said room-temperature-curable polybutadiene resin composition allows a coating film to be obtained, in particular a coating film that is resistant to gas permeation, said coating film therefore being useful as a coating material having properties preventing corrosion by a corrosive gas.Type: ApplicationFiled: July 10, 2019Publication date: September 30, 2021Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Takafumi SAKAMOTO
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Patent number: 10941317Abstract: The present invention pertains to a room-temperature-curable organopolysiloxane composition containing (A) an organopolysiloxane having the hydrolyzable silyl-group-containing monovalent organic group represented by formula (1) (R1 represents a substituted or unsubstituted C1-10 alkyl group or a substituted or unsubstituted C6-10 aryl group, R2 represents a substituted or unsubstituted C1-10 alkyl group or a substituted or unsubstituted C6-10 aryl group, and R3 represents a substituted or unsubstituted C1-20 alkyl group or a hydrogen atom; M is an integer from 1 to 3, and n is an integer of 2 or more; and the broken line represents atomic bonding), (B) a hydrolyzable organosilane compound and/or a partially hydrolyzed condensate thereof, (C) a curing catalyst, and (F) a bleed oil.Type: GrantFiled: March 20, 2018Date of Patent: March 9, 2021Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu Fujiwara, Tetsuro Yamada, Munenao Hirokami
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Publication number: 20200317919Abstract: Through the present invention, by undergoing a step in which a straight-chain diorganopolysiloxane having silanol groups at both terminal ends of the molecular chain thereof, a hydrolyzable silane and/or a partial hydrolysis condensate thereof having a hydrolyzable group capable of detaching a lactic acid ester, and an amino-group-containing hydrolyzable organosilane and/or a partial hydrolysis condensate thereof are pre-mixed/reacted in advance and silanol groups at both terminal ends of the molecular chain of a main agent (base polymer) are blocked by specific hydrolyzable silyl groups, it is possible to manufacture a lactic-acid-ester-type room-temperature-curable organopolysiloxane composition excellent in all characteristics including curability, adhesive properties, workability, and the like that were not attainable by the conventional lactic-acid-ester-type room-temperature curable (RTV) silicone rubber composition.Type: ApplicationFiled: September 21, 2018Publication date: October 8, 2020Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Takafumi SAKAMOTO
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Patent number: 10590286Abstract: Provided is a room temperature-curable organopolysiloxane composition for preventing aquatic organisms from adhering to and growing on an underwater structure. The composition comprises: (A) an organopolysiloxane represented by the following general formula (1) wherein R1 represents either a hydrogen atom or a monovalent hydrocarbon group that may have a substituent group, and n represents an integer of not smaller than 1; (B) a hydrolyzable organosilicon compound and/or a partial hydrolysis condensate thereof, represented by the following general formula (2) wherein R1 represents either a hydrogen atom or a monovalent hydrocarbon group that may have a substituent group, R2 represents either an alkyl group that may have a substituent group or a cycloalkyl group, and a represents an integer of 1 to 3; (C) a curing catalyst; and (G) a bleed oil.Type: GrantFiled: April 6, 2017Date of Patent: March 17, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Takafumi Sakamoto, Akitsugu Fujiwara, Takahiro Yamaguchi
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Publication number: 20200040208Abstract: Provided is a room temperature-vulcanizing silane-containing resin composition containing: (A) 100 parts by mass of a silane-modified polybutadiene compound represented by formula (1) (In the formula, each R1 is independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbons; each R2 is independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbons; f is a number equal to or greater than 0; e and g are numbers greater than 0; m is an integer from 1 to 3; and the sequence of the individual repeat units may be any sequence.); (B) 0.5 to 20 parts by mass of a hydrolyzable organosilane compound having in each molecule an average of at least two silicon atom-bonded hydrolyzable groups, and/or the partial hydrolysis condensate of this hydrolyzable organosilane compound; and (C) 0.1 to 10 parts by mass of a curing catalyst.Type: ApplicationFiled: December 22, 2017Publication date: February 6, 2020Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Munenao HIROKAMI
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Publication number: 20200032103Abstract: The present invention pertains to a room-temperature-curable organopolysiloxane composition containing (A) an organopolysiloxane having the hydrolyzable silyl-group-containing monovalent organic group represented by formula (1) (R1 represents a substituted or unsubstituted C1-10 alkyl group or a substituted or unsubstituted C6-10 aryl group, R2 represents a substituted or unsubstituted C1-10 alkyl group or a substituted or unsubstituted C6-10 aryl group, and R3 represents a substituted or unsubstituted C1-20 alkyl group or a hydrogen atom; M is an integer from 1 to 3, and n is an integer of 2 or more; and the broken line represents atomic bonding), (B) a hydrolyzable organosilane compound and/or a partially hydrolyzed condensate thereof, (C) a curing catalyst, and (F) a bleed oil.Type: ApplicationFiled: March 20, 2018Publication date: January 30, 2020Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akitsugu FUJIWARA, Tetsuro YAMADA, Munenao HIROKAMI
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Publication number: 20190127593Abstract: Provided is a room temperature-curable organopolysiloxane composition for preventing aquatic organisms from adhering to and growing on an underwater structure. The composition comprises: (A) an organopolysiloxane represented by the following general formula (1) wherein R1 represents either a hydrogen atom or a monovalent hydrocarbon group that may have a substituent group, and n represents an integer of not smaller than 1; (B) a hydrolyzable organosilicon compound and/or a partial hydrolysis condensate thereof, represented by the following general formula (2) wherein R1 represents either a hydrogen atom or a monovalent hydrocarbon group that may have a substituent group, R2 represents either an alkyl group that may have a substituent group or a cycloalkyl group, and a represents an integer of 1 to 3; (C) a curing catalyst; and (G) a bleed oil.Type: ApplicationFiled: April 6, 2017Publication date: May 2, 2019Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Takafumi SAKAMOTO, Akitsugu FUJIWARA, Takahiro YAMAGUCHI
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Patent number: 9920080Abstract: Provided is an alkoxysilyl-vinylene group-containing silicon compound represented by the following general formula (1): wherein each of R1 and R2 independently represents a monovalent hydrocarbon group having 1 to 20 carbon atoms; R represents a monovalent hydrocarbon group having an organic functional group(s) and 1 to 30 carbon atoms; and n represents an integer of 1 to 3. The alkoxy groups in the novel organic silicon compound of the invention have a dramatically improved hydrolyzability. Further, a high adhesion or adhesiveness; and a fast adhesiveness can be exhibited by adding the novel organic silicon compound to a room temperature curable organopolysiloxane.Type: GrantFiled: February 2, 2015Date of Patent: March 20, 2018Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Akira Uta, Akitsugu Fujiwara, Takafumi Sakamoto
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Publication number: 20170190721Abstract: Provided is an alkoxysilyl-vinylene group-containing silicon compound represented by the following general formula (1): wherein each of R1 and R2 independently represents a monovalent hydrocarbon group having 1 to 20 carbon atoms; R represents a monovalent hydrocarbon group having an organic functional group(s) and 1 to 30 carbon atoms; and n represents an integer of 1 to 3. The alkoxy groups in the novel organic silicon compound of the invention have a dramatically improved hydrolyzability. Further, a high adhesion or adhesiveness; and a fast adhesiveness can be exhibited by adding the novel organic silicon compound to a room temperature curable organopolysiloxane.Type: ApplicationFiled: February 2, 2015Publication date: July 6, 2017Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akira UTA, Akitsugu FUJIWARA, Takafumi SAKAMOTO
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Publication number: 20100316871Abstract: In a bonded article comprising a pair of substrates joined with a silicone base adhesive, a thin layer comprising a room temperature curable organopolysiloxane composition in the cured state having a lower strength than the adhesive intervenes between the substrate and the adhesive. The article is ready for recycling even after exposure to elevated temperature.Type: ApplicationFiled: June 8, 2010Publication date: December 16, 2010Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Akitsugu Fujiwara, Tsuneo Kimura
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Patent number: 7405316Abstract: Silyl ketene acetal compounds having a partial structure of formula (1) wherein R and R2 each are a monovalent C1-C12 hydrocarbon group and n is an integer of 1-6 are useful as a terminal alkoxysilylating agent, surface treating agent, storage stabilizer, curing agent or the likeType: GrantFiled: November 12, 2007Date of Patent: July 29, 2008Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Takafumi Sakamoto, Akitsugu Fujiwara, Noriko Kameda, Tsuneo Kimura
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Publication number: 20080114182Abstract: Silyl ketene acetal compounds having a partial structure of formula (1) wherein R and R2 each are a monovalent C1-C12 hydrocarbon group and n is an integer of 1-6 are useful as a terminal alkoxysilylating agent, surface treating agent, storage stabilizer, curing agent or the like.Type: ApplicationFiled: November 12, 2007Publication date: May 15, 2008Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Takafumi SAKAMOTO, Akitsugu FUJIWARA, Noriko KAMEDA, Tsuneo KIMURA