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1. 发明专利

JPH04198301A NEW PROCESS FOR PRODUCING CELLULOSE NITRATE 失效
公开(公告)号：JPH04198301A
公开(公告)日：1992-07-17
申请号：JP32262490
申请日：1990-11-28
申请人： ASAHI CHEMICAL IND
发明人： MATSUI TOSHIHIKO , YASUDA MASANARI
IPC分类号： C08B5/02 , D01F2/26
摘要： PURPOSE:To obtain the subject derivative having low substitution degree by dissolving or swelling cellulose in an aqueous solution containing a specific amount of an alkali metal hydroxide at a low temperature and treating the obtained mixture with a nitric acid-base mixed acid, thereby quickly and uniformly proceeding the reaction. CONSTITUTION:Cellulose is dissolved in or highly swollen with an aqueous solution containing 5-15wt.% of an alkali metal hydroxide (preferably 7-10wt.% of sodium hydroxide) at

2. 发明专利

JPH04153201A PREPARATION OF ALKYLCELLULOSE 失效
公开(公告)号：JPH04153201A
公开(公告)日：1992-05-26
申请号：JP27723090
申请日：1990-10-16
申请人： ASAHI CHEMICAL IND
发明人： YASUDA MASANARI , OKAJIMA KUNIHIKO
IPC分类号： C08B11/02
摘要： PURPOSE:To prepare an alkylcellulose having uniformly distributed substituents and a new distribution of degree of substitution by dissolving cellulose in or highly swelling it with an aq. alkali metal hydroxide soln. of a specified concn., and reacting the cellulose with an alkylating agent. CONSTITUTION:Cellulose physically or chemically treated to break hydrogen bonds to some extent is dissolved in or highly swollen with an aq. alkali metal hydroxide soln. of a 5-15wt.% concn. (pref. 7-11wt.% in the case of NaOH and 4-6.5wt.% in the case of LiOH) at a low temp, pref. at -15 to 25 deg.C, to give a a compsn. contg. cellulose dissolved or swollen as highly as almost dissolved. The compsn. is reacted with an alkylating agent, e.g. dimethyl sulfate, in an amt. of 0.01-10mol per mol of the glucose units of cellulose, giving an alkylcellulose.

3. 发明专利

JPH0770202A CELLULOSE ESTER AND ITS PRODUCTION 失效
公开(公告)号：JPH0770202A
公开(公告)日：1995-03-14
申请号：JP21883393
申请日：1993-09-02
申请人： ASAHI CHEMICAL IND
发明人： YASUDA MASANARI , YONEDA HARUYUKI
IPC分类号： C08B3/00 , C08B3/06 , C08B3/08 , C08L101/16
摘要： PURPOSE:To obtain an ester of high biodegradability and high position-selective substitution having the ester groups in the specific positions of the hydroxy groups bonding to the glucose units constituting the cellulose and giving useful fibers and membranes. CONSTITUTION:This cellulose ester comprises more than 95% of the structural units of formula I, II, III and VI (R is an acyl) where the total of the structural units of the formula II, III and IV is more than 10% and the maximum number of the structural units is 5,000. As a starting substance, a cellulose ester, whose hydroxy groups bonding to the carbon atoms in the C-2 and C-3 positions of the glycose unit and more than 90% of hydroxy groups bonding to the C-6 position are substituted with protecting groups is used to be esterified in the hydroxy groups in the C-2 and C-3 positions followed by deprotection with an acid in a halogenated hydrocarbon whereby the objective cellulose ester substantially bearing substituents only in the C-2 and C-3 positions is given. The protected cellulose is acylated with an acylating agent in a solvent such as pyridine.

4. 发明专利

JPS61228001A PRODUCTION OF CELLULOSE ETHER 失效
公开(公告)号：JPS61228001A
公开(公告)日：1986-10-11
申请号：JP6856585
申请日：1985-04-02
申请人： ASAHI CHEMICAL IND
发明人： OKAJIMA KUNIHIKO , YASUDA MASANARI
IPC分类号： C08L1/00 , C08B11/14 , C08L1/08
摘要： PURPOSE:To produce various cellulose ethers, stepwise, with the same synthetic steps without necessitating the pretreatment of the raw material, by mixing cellulose with a specific aqueous solvent composition and using the mixture as the initial stage reaction raw material. CONSTITUTION:An aqueous solvent composition obtained by mixing 1 liter of water with 1-5mol of an alkali metal hydroxide (e.g. hydroxide of Li, Na, etc.) and >=0.6mol of acrylonitrile or acrylamide (based on the glucose residue of the cellulose to be used as a raw material) at a low temperature (usually -15-+5 deg.C), is mixed with a cellulose (e.g. wood pulp, cotton linter, etc.) and the mixture is used as the initial stage reaction raw material. The mixture is stirred or heated and the reaction is terminated at a desired stage to obtain cyanoethylcellulose, carboxy(ethylcarbamoyl)ethylcellulose, or carbamoylethyl-cellulose. USE:Raw material for fiber, membrane or gel.

5. 发明专利

JPH0770201A CELLULOSE ESTER EXCELLENT IN SOLVENT RESISTANCE AND ITS PRODUCTION 失效
公开(公告)号：JPH0770201A
公开(公告)日：1995-03-14
申请号：JP21712093
申请日：1993-09-01
申请人： ASAHI CHEMICAL IND
发明人： YASUDA MASANARI , YONEDA HARUYUKI
IPC分类号： C08B3/00 , C08B3/06
摘要： PURPOSE:To obtain an ester of total substitution degree of 1 or more of cellulose, where the hydroxy groups in the specific positions bonding to the glucose units constituting cellulose are esterified and the ester can be formed into fibers or membranes showing high solvent resistance. CONSTITUTION:This cellulose ester comprises more than 95% of the structural units of formula I and formula II (R is an acyl) and contains more than 40% of the structural units of the formula II and includes 50 to 10,000 of the structural units. The cellulose ester, which has a degree of substitution in the C-6 position of the glycose unit is higher than 1.2 time the total substitution degree in the C-2 and the C-3 positions and more than 0.3 substitution degree in the C-6 position, is allowed to react with hydrazine or its derivative to give the objective cellulose ester bearing the substituents substantially in the C-6 positions. Further, the cellulose ester may be acylated before the reaction with hydrazine or its derivative. The content of the structural units of the formulas I and II may be more than 98% where the content of the formula II may be more than 15%. R in the formula II is preferably acetyl, propionyl or butyryl.

6. 发明专利

JPH1018124A RAYON FILAMENT YARN AND PRODUCTION THEREOF 失效
公开(公告)号：JPH1018124A
公开(公告)日：1998-01-20
申请号：JP16991796
申请日：1996-06-28
申请人： ASAHI CHEMICAL IND
发明人： YANAGIDA YOSHINORI , YASUDA MASANARI
IPC分类号： D01F2/06
摘要： PROBLEM TO BE SOLVED: To obtain the subject yarn having a dry strength and a dry elasticity, a high whiteness, a low degree of an aqueous swelling, and an improved uniform dyeability and handling property in processing thereof by performing a batch- wise steam treatment under a specific condition in the state of containing a prescribed amount of water content in a rayon filament yarn. SOLUTION: This method for producing a rayon filament having >=50 whiteness, =16% dry elasticity and >=1.6g/d dry strength, is to perform a batch-wise steam treatment of the rayon filament yarn of a cheese or a corn winding, and having 0.3-0.5g/cm winding density and 100-3000g yarn winding amount in a state of containing (15±2)-(35±2)% water content, at 100-140 deg.C for

7. 发明专利

JPS61254601A PRODUCTION OF CELLULOSE DERIVATIVE 失效
公开(公告)号：JPS61254601A
公开(公告)日：1986-11-12
申请号：JP9539885
申请日：1985-05-07
申请人： ASAHI CHEMICAL IND
发明人： OKAJIMA KUNIHIKO , YASUDA MASANARI
IPC分类号： C08B11/193
摘要： PURPOSE:To obtain the titled derivative, having a high substitution degree and remarkable nitric acid resistance, and useful as a base material for gelatinous explosives, etc., by adding a specific amount of carbamoylethyl carboxyethyl cellulose to an aqueous solution containing an alkali metal hydroxide and adding acrylamide thereto. CONSTITUTION:Carbamoylethyl carboxyethyl cellulose, having 0.1-0.6 total substitution degree, and soluble or highly swellable in water in an amount of 1-40pts.wt. based on 100pts.wt. aqueous solution containing 1-5mol, based on 1l water, alkali metal hydroxide, e.g. LiOH or NaOH, is added to the aqueous solution, dissolved or suspended therein to give a mixture. Acrylamide in an amount of >=0.1mol, preferably >=2.0mol, based on the glucose residue of the carbamoylethyl carboxyethyl collulose in the above-mentioned mixture is added thereto to afford an initial reaction product, which is then reacted while heating preferably at 40-60 deg.C for 0.5-5hr to give the aimed cellulose derivative.

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