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公开(公告)号：US11046787B2
公开(公告)日：2021-06-29
申请号：US16612552
申请日：2018-05-09
发明人： Joji Kadota , Yasuyuki Agari , Hiroshi Hirano , Akinori Okada , Takaaki Imai
IPC分类号： C08B15/00 , C08G63/08 , C08K5/3432
摘要： Provided are a polylactide-grafted cellulose nanofiber that is suitable as a molding material, and a production method thereof. A polylactide-grafted cellulose nanofiber includes grafted cellulose having a graft chain bonding to cellulose constituting a cellulose nanofiber, wherein the graft chain is a polylactide, and a ratio of an absorbance derived from C═O of the polylactide to an absorbance derived from O—H of the cellulose on an infrared absorption spectrum is no less than 0.01 and no greater than 1,000. In addition, a production method of a polylactide-grafted cellulose nanofiber includes carrying out graft polymerization of a lactide to cellulose constituting a cellulose nanofiber in the presence of an organic polymerization catalyst which includes an amine and a salt obtained by reacting the amine with an acid. As the organic polymerization catalyst, 4-dimethylaminopyridine and 4-dimethylaminopyridinium triflate are preferred.
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公开(公告)号：US20220064858A1
公开(公告)日：2022-03-03
申请号：US17275006
申请日：2019-09-18
发明人： Takaaki Imai , Takahiro Miyoshi , Junya Okawa
摘要： To provide a cellulose fiber molded product having improved tensile elastic modulus, preferably a cellulose fiber molded product also having improved tensile strength, and a method for manufacturing the same. A cellulose fiber molded product contains cellulose fibers as the main component, in which the cellulose fibers contain pulp and defibrated fibers, and the defibrated fibers contain microfibrillated cellulose. For manufacturing the molded product, a cellulose fiber slurry is prepared using the pulp and the defibrated fibers, wet paper is formed from the cellulose fiber slurry, and the wet paper is dehydrated, pressurized, and heated. At this time, as the defibrated fibers, microfibrillated cellulose, or microfibrillated cellulose and cellulose nanofibers are used.
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3.发明公开公开(公告)号：US20230159665A1
公开(公告)日：2023-05-25
申请号：US17913945
申请日：2021-03-11
发明人： Takaaki Imai , Yu Ochiai
摘要： A fibrous cellulose has an average fiber width of 0.1 µm or more and has a part or all of hydroxyl groups replaced with carbamate groups, in which a replacement ratio with the carbamate group is 1.0 mmol/g or more, and a fine ratio is 30% or more. A fibrous cellulose composite resin contains a fibrous cellulose and a resin, and the above fibrous cellulose In manufacturing fibrous cellulose, a cellulose raw material and urea or the like are subjected to a heat treatment to replace a part or all of hydroxyl groups of the cellulose raw material with carbamate groups, defibration is performed within a range in which an average fiber width is 0.1 µm or more, the heat treatment is performed such that a replacement ratio with the carbamate group is 1.0 mmol/g or more, and the defibration is performed until a fine ratio reaches 30% or more.
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4.发明公开公开(公告)号：US20230357449A1
公开(公告)日：2023-11-09
申请号：US17802453
申请日：2021-03-02
发明人： Takaaki Imai , Yu Ochiai
CPC分类号： C08B15/06 , C08L23/12 , C08L2205/16
摘要： Fibrous cellulose highly capable of reinforcing resins, fibrous cellulose composite resins with high strength, and a method for preparing fibrous cellulose highly capable of reinforcing resins. The fibrous cellulose has an average fiber width of ≥0.1 μm, and has hydroxyl groups partially/fully substituted with carbamate groups at the substitution rate of ≥1.0 mmol/g, and has an average fiber length of >0.10 mm. This fibrous cellulose and a resin are contained in the composite resin. The method includes heat treating a cellulose raw material and urea or derivatives thereof to substitute part/all of the hydroxyl groups in the cellulose raw material with carbamate groups, and defibrating the raw material into an average fiber width of ≥0.1 μm, wherein the heat treating is performed so that the rate of carbamate-group-substitution is ≥1.0 mmol/g and an average fiber length of the material is >0.10 mm.
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公开(公告)号：US20230287147A1
公开(公告)日：2023-09-14
申请号：US17924312
申请日：2021-06-01
发明人： Takaaki Imai
CPC分类号： C08B15/06 , C08L23/26 , C08L2205/16
摘要： A fibrous cellulose excellent in heat resistance and reinforcing effect on resins, and fibrous cellulose composite resins having high strength. The fibrous cellulose has an average fiber width of 0.1 to 19 µm, has hydroxyl groups substituted with carbamate groups at a rate of substitution of 1.0 to 2.0 mmol/g, and has an average fiber length of 0.10 mm or longer. The fibrous cellulose composite resin contains the fibrous cellulose and a resin.
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公开(公告)号：US11814794B2
公开(公告)日：2023-11-14
申请号：US17275006
申请日：2019-09-18
发明人： Takaaki Imai , Takahiro Miyoshi , Junya Okawa
摘要： A cellulose fiber molded product having improved tensile elastic modulus and a method for manufacturing the molded product is provided. The cellulose fiber molded product contains cellulose fibers as the main component, in which the cellulose fibers contain pulp and defibrated fibers, and the defibrated fibers contain microfibrillated cellulose. The method for manufacturing the molded product includes preparing a cellulose fiber slurry using the pulp and the defibrated fibers, forming wet paper from the cellulose fiber slurry, and dehydrating, pressurizing, and heating the wet paper. The defibrated fibers include microfibrillated cellulose, or microfibrillated cellulose and cellulose nanofibers.
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公开(公告)号：US20230126138A1
公开(公告)日：2023-04-27
申请号：US17907859
申请日：2021-03-02
发明人： Takaaki Imai , Yu Ochiai
摘要： A fibrous cellulose-containing material capable of significantly improving resin strength and a method of preparation thereof, as well as a fibrous cellulose composite resin excellent in strength. The fibrous cellulose-containing material contains fibrous cellulose which is a carbamate-modified microfiber cellulose having hydroxyl groups, part or all of which are substituted with carbamate groups, and having an average fiber width of not smaller than 0.1 μm, and contains powder that is non-interactive with the fibrous cellulose. The fibrous cellulose composite resin contains fibrous cellulose which is the above-mentioned fibrous cellulose-containing material, and part or all of the resin is powdered resin. The method for preparing a fibrous cellulose-containing material includes adding at least either of powder that is non-interactive with fibrous cellulose and a dispersion thereof, to a dispersion of carbamate-modified microfiber cellulose to obtain a mixed liquid, and removing the dispersion medium from the mixed liquid.
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公开(公告)号：US20220282076A1
公开(公告)日：2022-09-08
申请号：US17633315
申请日：2020-08-24
发明人： Ikko Matsusue , Takaaki Imai , Yu Ochiai
摘要： A fibrous cellulose composite resin excellent in strength, and a method for producing the same. The fibrous cellulose composite resin includes microfiber cellulose, a resin, and an acid-modified resin, wherein the microfiber cellulose has hydroxyl groups, which are substituted with carbamate groups, and has been washed and defibrated into an average fiber width of 0.1 μm or larger, in which the amount of the byproduct is 10% or less per 100 parts by mass of a carbamate-modified cellulose. The production method includes heat-treating a cellulose raw material and urea to obtain a carbamate-modified cellulose, washing the carbamate-modified cellulose, defibrating the carbamate-modified cellulose to obtain a dispersion of carbamate-modified microfiber cellulose having an average fiber width of 0.1 μm or larger, mixing the dispersion and an acid-modified resin to obtain a material containing carbamate-modified microfiber cellulose, and kneading the material with a resin to obtain a composite resin.
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公开(公告)号：US20240003095A1
公开(公告)日：2024-01-04
申请号：US18038119
申请日：2021-12-01
发明人： Kazuto Sawada , Masashi Uno , Kazuo Fujita , Takahiro Miyoshi , Takaaki Imai
摘要： A wet sheet which is hard to be fractured during production into a molded body, stable in shape, and easy to handle in processing, and a method for producing a molded body from the wet sheet. The wet sheet includes fine cellulose fibers having an average fiber diameter of 10000 nm or smaller, and pulp, wherein the wet sheet has a water content of 60 mass % or higher, and a thickness of 0.5 mm or more and 10 mm or less. A method for producing a molded body includes applying heat and pressure to a wet sheet to obtain a molded body, wherein the wet sheet includes fine cellulose fibers having an average fiber diameter of 10000 nm or smaller, and pulp, and has a water content of 60 mass % or higher, and a thickness of 0.5 mm or more and 10 mm or less.
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公开(公告)号：US20230183384A1
公开(公告)日：2023-06-15
申请号：US17924318
申请日：2021-06-01
发明人： Takaaki Imai
CPC分类号： C08B15/06 , C08L1/08 , C08L2205/16
摘要： Fibrous cellulose-containing materials not causing coloring problem when used as resin-reinforcing materials, a preparation method thereof, and fibrous cellulose composite resins without coloring problem. The material contain fibrous cellulose having an average fiber width of 0.1 to 19 μm, and having hydroxyl groups partially/fully substituted with carbamate groups at a rate of 1.0 mmol/g or higher, and the material has a moisture percentage below 18%. The method includes heat treating a cellulose raw material and urea and/or a derivative thereof to substitute part/all of hydroxyl groups in cellulose with carbamate groups, defibrating the raw material to have an average fiber width of 0.1 to 19 μm, and adjusting moisture percentage to below 18% to obtain a fibrous cellulose-containing material, and the heat treating is performed so that the substitution rate is 1.0 mmol/g or higher. The fibrous cellulose composite resin contains the fibrous cellulose-containing material and resin.
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