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公开(公告)号：DE69327286T2
公开(公告)日：2000-05-11
申请号：DE69327286
申请日：1993-09-13
Applicant: DAICEL CHEM
Inventor： SAKA SHIRO , MATSUMURA HIROYUKI , HABU NAOTO , KAINO YOSHIAKI , IWATA RYOUTA , ASAI TANEMI , SHIMAMOTO SHU
Abstract: A fatty acid ester of cellulose excellent in transparency, filterability and spinnability in spite of its high content of mannose and xylose, wherein the total molar content of mannose and xylose accounts for at least 7% of that of glucose, mannose and xylose, and the amount of filtration satisfies a specified requirement. Such a fatty acid ester of cellulose is prepared by using a pulp having a low alpha -cellulose content as a raw material and a fatty acid corresponding to the ester as a diluent and adding an organic solvent in an amount of at least 10% by weight based on the diluent in any step during the preparation. In the preparation of cellulose diacetate, which is excellent in filterability and transparency, by the acetic acid process, the cellulose diacetate obtained by aging is dissolved in a solvent which can dissolve it and the resulting cellulose diacetate is recovered.
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公开(公告)号：DE69327286D1
公开(公告)日：2000-01-20
申请号：DE69327286
申请日：1993-09-13
Applicant: DAICEL CHEM
Inventor： SAKA SHIRO , MATSUMURA HIROYUKI , HABU NAOTO , KAINO YOSHIAKI , IWATA RYOUTA , ASAI TANEMI , SHIMAMOTO SHU
Abstract: A fatty acid ester of cellulose excellent in transparency, filterability and spinnability in spite of its high content of mannose and xylose, wherein the total molar content of mannose and xylose accounts for at least 7% of that of glucose, mannose and xylose, and the amount of filtration satisfies a specified requirement. Such a fatty acid ester of cellulose is prepared by using a pulp having a low alpha -cellulose content as a raw material and a fatty acid corresponding to the ester as a diluent and adding an organic solvent in an amount of at least 10% by weight based on the diluent in any step during the preparation. In the preparation of cellulose diacetate, which is excellent in filterability and transparency, by the acetic acid process, the cellulose diacetate obtained by aging is dissolved in a solvent which can dissolve it and the resulting cellulose diacetate is recovered.
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公开(公告)号：GB2257142B
公开(公告)日：1994-03-09
申请号：GB9213851
申请日：1992-06-30
Applicant: DAICEL CHEM
Inventor： TANIGUCHI HIROKI , KAINO YOSHIAKI , IWATA RYOTA
Abstract: A process for producing cellulose acetate from a hard, low-grade pulp sheet having a high sheet density on an industrial scale without impairing the acetylation reactivity of the pulp, characterized in that a pulp sheet having a sheet density of at least 0.5 g/cm3 is used as the cellulose material and the pulp sheet is disintegrated while feeding less than 40 parts by weight, based on 100 parts by weight (in terms of oven-dry weight) of the pulp sheet, of water into the disintegrating section of a disintegrator in the step of disintegrating the material. The present process is economically advantageous because the drying and humidity controlling steps are simplified due to the quantity of water to be fed being small.
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公开(公告)号：GB2257142A
公开(公告)日：1993-01-06
申请号：GB9213851
申请日：1992-06-30
Applicant: DAICEL CHEM
Inventor： TANIGUCHI HIROKI , KAINO YOSHIAKI , IWATA RYOTA
Abstract: A process for producing cellulose acetate from a hard, low-grade pulp sheet having a high sheet density on an industrial scale without impairing the acetylation reactivity of the pulp, characterized in that a pulp sheet having a sheet density of at least 0.5 g/cm is used as the cellulose material and the pulp sheet is disintegrated while feeding less than 40 parts by weight, based on 100 parts by weight (in terms of oven-dry weight) of the pulp sheet, of water into the disintegrating section of a disintegrator in the step of disintegrating the material.
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公开(公告)号：JP2003176301A
公开(公告)日：2003-06-24
申请号：JP2002344250
申请日：2002-11-27
Applicant: DAICEL CHEM
Inventor： HANIYU NAOTO , KAINO YOSHIAKI , IWATA RYOTA , ASAI TANEMI , SHIMAMOTO SHU
IPC: C08B3/06
Abstract: PROBLEM TO BE SOLVED: To obtain cellulose diacetate having excellent filterability. SOLUTION: This cellulose diacetate has the total of mol fraction of xylose and mannose being ≥3.3% the total of mol fraction of xylose, mannose and glucose in constituent saccharide analysis. (1) The amount of precipitation component obtained in centrifugal separation of 2 wt.% acetone solution at 8,000 rpm for 30 minutes is ≤0.2% the whole sample contained in the solution and (2) the amount of precipitation component obtained in centrifugal separation of 2 wt.% acetone solution at 50,000 rpm for 3 hours is ≥1.1% of the whole sample contained in the solution. COPYRIGHT: (C)2003,JPO
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Patent Agency Ranking
公开(公告)号：JPS63166809A
公开(公告)日：1988-07-11
申请号：JP31277186
申请日：1986-12-27
Applicant: DAICEL CHEM
Inventor： KAGOTANI MASAHIRO , KAINO YOSHIAKI
Abstract: PURPOSE:To obtain a termite repellent having low toxicity with no fear of environmental pollution, having excellent penetration and adsorption in treating wood, etc., capable of sustaining the effects, comprising quaternary ammonium salt of alginic acid as an active ingredient. CONSTITUTION:A termite expellent comprising quaternary ammonium salt of alginic acid, for example, obtained by reacting sodium alginate with a quaternary ammonium salt halide as an active ingredient. The quaternary ammonium salt of alginic acid is dissolved in a lower alcohol such as methanol, ethanol, in 0.1-25wt.% concentration and used. The active ingredient is made into a film on the surface or the surface layer of wood and fixed. Since the film is water-insoluble, it will not flow and since the quaternary ammonium salt has alginic acid as skeleton, it has hydrophilic nature and affinity for wood.
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公开(公告)号：JPH06157602A
公开(公告)日：1994-06-07
申请号：JP18399993
申请日：1993-07-26
Applicant: DAICEL CHEM
Inventor： HANIYU NAOTO , KAINO YOSHIAKI , IWATA RYOTA , ASAI TANEMI , SHIMAMOTO SHU
Abstract: PURPOSE:To produce a high-quality cellulose diacetate from a low-grade wood pulp having a low alpha-cellulose content by aging cellulose diacetate obtd. by acetylating the pulp, dissolving the aged cellulose diacetate in a solvent therefor, and recovering the diacetate from the soln. CONSTITUTION:An aged cellulose diacetate is dissolved in a solvent capable of dissolving it and then recovered from the soln. in the process for producing cellulose diacetate contg. the step of acetylating raw material pulp and the aging step. Thus is obtd. cellulose diacetate excellent in filtrability without removing hemicellulose contained in it. The obtd. diacetate has qualities equivalent to those of cellulose diacetate obtd. from a high-grade wood pulp, and thus a heretofore unusable low-grade pulp is made usable.
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公开(公告)号：JPH02311501A
公开(公告)日：1990-12-27
申请号：JP13365889
申请日：1989-05-26
Applicant: DAICEL CHEM
Inventor： TANIGUCHI HIROKI , KAINO YOSHIAKI , IWATA RYOTA
IPC: C08B1/00
Abstract: PURPOSE:To prepare a ground cellulose material having an excellent reactivity before the reaction to produce a cellulose deriv. by impregnating a cellulose material with water and then mechanically grinding it. CONSTITUTION:In producing a secondary cellulose acetate wherein a cellulose material is ground, preactivated, acetylated, saponified, and aged, 100 pts.wt. cellulose material comprising a pulp sheet with a density of 0.5 to 1.3g/cm is impregnated with 10 to 200 pts.wt. water before being mechanically ground. Thus the cellulose acetate can be produced economically from a hard, low-grade pulp sheet with a high density.
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公开(公告)号：JPH059201A
公开(公告)日：1993-01-19
申请号：JP16157991
申请日：1991-07-02
Applicant: DAICEL CHEM
Inventor： TANIGUCHI HIROKI , KAINO YOSHIAKI , IWATA RYOTA
Abstract: PURPOSE:To provide an industrially practicable process for producing cellulose acetate without lowering the acetylation reactivity of pulp from a hard high- density low-grade pulp sheet. CONSTITUTION:A pulp sheet of a density of 0.5g/cm or above is used as a cellulose material and time sheet is disintegrated in the disintegration step while feeding water in an amount of below 40 pts.wt. per 100 pts.wt. (bone dry weight) said sheet to the disintegration section of a disintegrator. The step of moisture control and drying can be simplified because the amount of water fed is small, and therefore this process is economically advantageous.
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公开(公告)号：JPH0255701A
公开(公告)日：1990-02-26
申请号：JP20710388
申请日：1988-08-19
Applicant: DAICEL CHEM
Inventor： KAGOTANI MASAHIRO , KAINO YOSHIAKI
IPC: B01J20/281 , B01D15/08 , B01J20/26 , C08B3/24 , G01N30/88
Abstract: PURPOSE:To produce fine globular cellulose particles which can satisfy both separation performance and flow velocity properties by a allowing a specific crosslinking agent to be present when fine globular cellulose triacetate particles are subjected to alkali hydrolysis. CONSTITUTION:When fine globular cellulose triacetate particles (those having a particle size of 10-500mu is preferred, especially preference being given to those having a uniform network structure) are hydrolyzed with an alkali into fine globular cellulose particles, a compound having 2 or more functional groups in the molecule which can produce ether linkages by the reaction with the hydroxyl groups (e.g., epichlorohydrin) is added as a crosslinking agent into the reaction system. According to the process, formation of hydrogen bonds can be inhibited, shrinkage of the cellulose which is forming can be suppressed, and therefore cellulose particles which can satisfy both separation performance and flow velocity properties can be obtained. Further, by controlling the concentration of the alkali in the system, crosslinking can be effected under various swelling conditions to control the properties of cellulose particles that will be produced.
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