Patents Assigned to JAPAN VAM & POVAL CO., LTD.
-
Publication number: 20240100227Abstract: Provided is a novel device or a novel implantation device. The implantation device is one of the following: (1) an implantation device comprising a material (A) having a density of 12 mg/cm3 or more and a dissolution rate of 80% or less as determined after immersion of the material (A) in physiological saline at 37° C. for 24 hours; and (2) an implantation device comprising a material (A) having a dissolution rate of 80% or less as determined after immersion of the material (A) in physiological saline at 37° C. for 24 hours and a ratio of X/Y of 0.24 or more wherein X is a density (mg/cm3) of the material (A) and Y is a degree of swelling of the material (A) expressed in terms of fold increase as determined after immersion of the material (A) in physiological saline at 37° C. for 60 minutes.Type: ApplicationFiled: February 8, 2022Publication date: March 28, 2024Applicants: Shin-Etsu Chemical Co., Ltd., JAPAN VAM & POVAL CO., LTD., TOHOKU UNIVERSITYInventors: Shuhei KANESATO, Yoshihiro KIMURA, Akinobu OHARUDA, Keita ISHIBA, Masafumi GOTO
-
Publication number: 20240091404Abstract: Provided is a novel device (implantation device) containing a gelatin. The implantation device is made of a bioabsorbable non-woven fabric containing a gelatin.Type: ApplicationFiled: February 8, 2022Publication date: March 21, 2024Applicants: Shin-Etsu Chemical Co., Ltd., JAPAN VAM & POVAL CO., LTD., TOHOKU UNIVERSITY, KYOTO MEDICAL PLANNING Co., LtdInventors: Shuhei KANESATO, Yoshihiro KIMURA, Akinobu OHARUDA, Masafumi GOTO
-
Patent number: 11684693Abstract: A cell or tissue embedding device having an aqueous gel serving as an immunoisolation layer, the aqueous gel containing, as components thereof, a denatured polyvinyl alcohol resin having an activated carbonyl group and a crosslinking agent is highly capable of supplying a physiologically active substance.Type: GrantFiled: February 23, 2018Date of Patent: June 27, 2023Assignees: Japan Vam & Poval Co., Ltd., National University Corporation Tohoku UniversityInventors: Akinobu Oharuda, Yoshihiro Kimura, Masafumi Goto
-
Publication number: 20230149313Abstract: A novel sustained-release base is provided. The sustained-release base is a combination of a polyvinyl alcohol-based polymer and a low-substituted hydroxypropyl cellulose.Type: ApplicationFiled: March 24, 2021Publication date: May 18, 2023Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Shotaro KAWADA, Masatoshi KAWANISHI
-
Publication number: 20230148062Abstract: A novel binder is provided. The binder comprises a polyvinyl alcohol-based polymer having an average saponification value of 96.0 mol% or more.Type: ApplicationFiled: March 24, 2021Publication date: May 11, 2023Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Shotaro KAWADA, Masatoshi KAWANISHI
-
Publication number: 20230070463Abstract: The present invention provides a novel angiogenesis device. The angiogenesis device comprises an angiogenic component and a polymer, and is used to induce angiogenesis at a site for implantation of a cell- or tissue-containing device. The polymer may comprise, for example, at least one or more polyvinyl alcohol resins (A) selected from a modified polyvinyl alcohol resin having an active carbonyl group (A1), a polyvinyl alcohol resin having a triad syndiotacticity of 32 to 40% (A2), and a polyvinyl alcohol resin having a degree of saponification of 97 mol % or more (A3).Type: ApplicationFiled: February 3, 2021Publication date: March 9, 2023Applicants: Shin-Etsu Chemical Co., Ltd., JAPAN VAM & POVAL CO., LTD., TOHOKU UNIVERSITYInventors: Shuhei KANESATO, Yoshihiro KIMURA, Akinobu OHARUDA, Masafumi GOTO
-
Publication number: 20230076461Abstract: The present invention provides a novel angiogenesis device. The angiogenesis device comprises an angiogenic component and a polymer. The polymer may comprise, for example, at least one or more polyvinyl alcohol resins (A) selected from a modified polyvinyl alcohol resin having an active carbonyl group (A1), a polyvinyl alcohol resin having a triad syndiotacticity of 32 to 40% (A2), and a polyvinyl alcohol resin having a degree of saponification of 97 mol % or more (A3).Type: ApplicationFiled: February 3, 2021Publication date: March 9, 2023Applicants: Shin-Etsu Chemical Co., Ltd., JAPAN VAM & POVAL CO., LTD., TOHOKU UNIVERSITYInventors: Shuhei KANESATO, Yoshihiro KIMURA, Akinobu OHARUDA, Masafumi GOTO
-
Publication number: 20230055305Abstract: Provided is a novel polishing composition. The polishing composition comprises a water-soluble polymer at least comprising a vinyl alcohol-based resin having a side-chain group of 3 carbon atoms or more.Type: ApplicationFiled: January 22, 2021Publication date: February 23, 2023Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Takashi MURAKAMI, Yoshihiro KIMURA
-
Publication number: 20230040738Abstract: Provided is a novel polishing composition. The polishing composition comprises a water-soluble polymer that at least comprises a vinyl alcohol-based resin of which a 4% aqueous solution has a viscosity of 15 mPa·s or more at 20° C.Type: ApplicationFiled: January 22, 2021Publication date: February 9, 2023Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Takashi MURAKAMI, Yoshihiro KIMURA
-
Patent number: 11339232Abstract: Provided is a dispersion assistant useful for suspension polymerization of vinyl-based compounds. The dispersion assistant comprises a polyvinyl alcohol-based polymer (A) comprising a constituent unit represented by the general formula (1) shown below at 0.1 to 10 mol % per polyvinyl alcohol monomer unit and having a saponification degree of 15 to 70 mol %. (In the formula, R denotes an alkyl group.Type: GrantFiled: October 17, 2017Date of Patent: May 24, 2022Assignee: Japan Vam & Poval Co., Ltd.Inventors: Takehiro Omori, Yoshiaki Kozuka
-
Publication number: 20210395507Abstract: A novel binder is provided. The binder comprises a polyvinyl alcohol-based polymer which has an average saponification value of 85.0 mol % to 89.0 mol % as measured according to JIS K6726 and meets requirement (A): based on data obtained by measurement of the polyvinyl alcohol-based polymer by liquid chromatography, a value represented by formula (3) shown below is 22 or more, wherein the measurement is performed with a liquid chromatography system equipped with a charged aerosol detector and a Thermo Scientific Acclaim™ 300 column (catalog number: 060266, carbon load: 8%, maximum pressure: 4500 psi, particle size: 3 ?m, pore size: 300 A, stationary phase: C18, surface area: 100 m2/g, length: 150 mm, diameter: 4.6 mm, pH: 2.5 to 7.5, material: glass lined tubing) under the measurement conditions described below, wherein the data represent a baseline-normalized intensity over a retention time of 5.0 to 12.Type: ApplicationFiled: November 13, 2019Publication date: December 23, 2021Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Shotaro KAWADA, Masatoshi KAWANISHI
-
Publication number: 20210324222Abstract: A novel binder is provided. The binder comprises a polyvinyl alcohol-based polymer which has an average saponification value of 85.0 mol % to 89.0 mol % as measured according to JIS K6726 and meets requirement (A): a fluid prepared by adding 130.0 mL of 1-propanol to 100.0 g of a 5.0% by mass aqueous solution of the polyvinyl alcohol-based polymer has a transparency of 80.0% or less at 20° C.; and/or requirement (B): a supernatant from a fluid prepared by adding 230.0 mL of 1-propanol to 100.0 g of a 5.0% by mass aqueous solution of the polyvinyl alcohol-based polymer has a concentration of 0.65% by mass or more at 20° C.Type: ApplicationFiled: November 13, 2019Publication date: October 21, 2021Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Shotaro KAWADA, Masatoshi KAWANISHI
-
Patent number: 11020353Abstract: Provided are a film coating composition containing a PVA having a degree of hydrolysis of 85.0 to 89.0 mol %, characterized in that even when the composition is used for coating of tablets without any additives other than PVAs, the tablets do not tend to stick to each other; a solid oral formulation using the composition; and a method for producing the same.Type: GrantFiled: September 30, 2015Date of Patent: June 1, 2021Assignee: JAPAN VAM & POVAL CO., LTD.Inventors: Shotaro Kawada, Masatoshi Kawanishi
-
Patent number: 10731032Abstract: An object of the present invention is to provide a dispersion assistant that, when used for suspension polymerization of a vinyl-based compound, achieves stable production of a good polymer (vinyl-based resin) without much scale adhesion on the polymerization tank even in the cases where used in a large amount. Provided is a dispersion assistant for suspension polymerization, which comprises a polyvinyl alcohol-based polymer (A) having an acetal group (a) having an olefinic unsaturated double bond, the polymer having a saponification degree of 60 mol% or less.Type: GrantFiled: November 29, 2016Date of Patent: August 4, 2020Assignee: JAPAN VAM & POVAL CO., LTD.Inventors: Yoshiaki Kozuka, Takehiro Omori
-
Patent number: 10538120Abstract: Provided is a method for producing a polyvinyl alcohol resin, comprising the steps of copolymerizing an aliphatic vinyl ester (A) with diacetone acrylamide (B), at least a part of which diacetone acrylamide (B) is added at a later stage, in the presence of a polymerization catalyst in an alcohol solvent, so that the ratio (a)/(b) of the polymerization yield at the end of the polymerization (a) to the polymerization yield at the end of the later addition (b) of diacetone acrylamide (B) is in the range of 1.01 to 1.10, and saponifying the resulting copolymer.Type: GrantFiled: September 10, 2014Date of Patent: January 21, 2020Assignee: JAPAN VAM & POVAL CO., LTD.Inventors: Akinobu Oharuda, Masatoshi Kawanishi
-
Publication number: 20190248931Abstract: Provided is a dispersion assistant useful for suspension polymerization of vinyl-based compounds. The dispersion assistant comprises a polyvinyl alcohol-based polymer (A) comprising a constituent unit represented by the general formula (1) shown below at 0.1 to 10 mol % per polyvinyl alcohol monomer unit and having a saponification degree of 15 to 70 mol %. (In the formula, R denotes an alkyl group.Type: ApplicationFiled: October 17, 2017Publication date: August 15, 2019Applicant: Japan Vam & Poval Co., Ltd.Inventors: Takehiro Omori, Yoshiaki Kozuka
-
Patent number: 10301402Abstract: Provided is a dispersion stabilizer which exhibits an excellent polymerization stability when used in suspension polymerization for a vinyl chloride-based resin, and gives a vinyl chloride-based resin having few coarse particles, few fish eyes after resin molding, an excellent plasticizer absorption, and an excellent hue. Also provided is a high-quality vinyl chloride-based resin produced using the dispersion stabilizer. The present invention is a dispersion stabilizer for suspension polymerization containing a polyvinyl alcohol-based polymer (B) which has a double bond in a side chain and which is obtainable by acetalization of a polyvinyl alcohol-based polymer (A) with a monoaldehyde having an olefinic unsaturated double bond.Type: GrantFiled: May 26, 2015Date of Patent: May 28, 2019Assignee: Japan Vam & Poval Co., Ltd.Inventors: Yoshiaki Kozuka, Takehiro Omori
-
Publication number: 20170348242Abstract: Provided are a film coating composition containing a PVA having a degree of hydrolysis of 85.0 to 89.0 mol %, characterized in that even when the composition is used for coating of tablets without any additives other than PVAs, the tablets do not tend to stick to each other; a solid oral formulation using the composition; and a method for producing the same.Type: ApplicationFiled: September 30, 2015Publication date: December 7, 2017Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Shotaro KAWADA, Masatoshi KAWANISHI
-
Publication number: 20160271988Abstract: Provided is a method for producing a polyvinyl alcohol resin, comprising the steps of copolymerizing an aliphatic vinyl ester (A) with diacetone acrylamide (B), at least a part of which diacetone acrylamide (B) is added at a later stage, in the presence of a polymerization catalyst in an alcohol solvent, so that the ratio (a)/(b) of the polymerization yield at the end of the polymerization (a) to the polymerization yield at the end of the later addition (b) of diacetone acrylamide (B) is in the range of 1.01 to 1.10, and saponifying the resulting copolymer.Type: ApplicationFiled: September 10, 2014Publication date: September 22, 2016Applicant: JAPAN VAM & POVAL CO., LTD.Inventors: Akinobu OHARUDA, Masatoshi KAWANISHI