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1. 发明专利

JP2001131284A THERMOPLASTIC POLYIMIDE 失效
公开(公告)号：JP2001131284A
公开(公告)日：2001-05-15
申请号：JP31237599
申请日：1999-11-02
申请人： UNITIKA LTD
发明人： MOTONAMI TOSHIYA , ITO AKIRA , YOSHINO TAKEMASA , WADA KAZUYO
IPC分类号： C08G73/10
摘要： PROBLEM TO BE SOLVED: To provide a thermoplastic polyimide which shows excellent heat stability, good fabricability and an excellent flame retardancy. SOLUTION: This thermoplastic polyimide is obtained by reacting a tetracarboxylic acid component with a diamine component, the tetracarboxylic acid component being 3,3',4,4'-biphenyltetracarboxylic acid and/or a derivative thereof, the diamine component comprising not less than 35 mol% to less than 100 mol% of m-xylylenediamine and more than 0 mol% to not more than 65 mol% of 1,3-bis(4-aminophenoxy)benzene.

2. 发明专利

JP2000119437A SYNTACTIC FOAM AND ITS PRODUCTION 失效
公开(公告)号：JP2000119437A
公开(公告)日：2000-04-25
申请号：JP29649098
申请日：1998-10-19
申请人： UNITIKA LTD
发明人： ITO AKIRA , WADA KAZUYO , TOMIOKA ISAO
IPC分类号： C08J9/32
摘要： PROBLEM TO BE SOLVED: To obtain a syntactic foam having excellent heat resistance and processability by selecting a foam prepared by dispersing microballoons in a thermoplastic wholly aromatic polyimide resin and having a specified density. SOLUTION: The thermoplastic polyimide is a wholly aromatic one comprising an aromatic tetracarboxylic acid component (e.g. 4,4'-oxydiphthalic acid) and an aromatic diamine component (e.g. 3,4'-oxydianiline). The microballoons are in the form of hollow spheres, made from, for example, glass, and suitably have a mean particle diameter of 150 μm. Its amount of addition is desirably 10-90 wt.% based on the foam. The density of the foam should be 0.05-0.4 g/cm3. The foam is obtained by the thermocompression molding of a powder (of a mean particle diameter of 150 μm or below) of a thermoplastic wholly aromatic polyimide resin and microballoons at 250-320 deg.C for 10 min to 3 hr. The clearance between the top and bottom forces is adjusted before molding to attain a desired density.

3. 发明专利

JPH1083807A NONAQUEOUS LITHIUM SECONDARY BATTERY 失效
公开(公告)号：JPH1083807A
公开(公告)日：1998-03-31
申请号：JP23504896
申请日：1996-09-05
申请人： UNITIKA LTD
发明人： MOTONAMI TOSHIYA , WADA KAZUYO , ECHIGO YOSHIAKI
IPC分类号： H01M10/05 , C01B31/08 , H01M4/587 , H01M4/02 , H01M4/58 , H01M10/40
摘要： PROBLEM TO BE SOLVED: To provide a nonaqueous lithium secondary battery with excellent cycle property, high Coulomb efficiency of charging and discharging, and high capacity. SOLUTION: In a nonaqueous lithium secondary battery having a lithium salt as an electrolytic substance and an anode and a cathode, a molded body produced by heating a mixture of thermosetting resin and a metal salt and containing a carbon material with 0.001-0.03 atomic ratio (N/C) of nitrogen atom and carbon atom, 3.65-4.00Ålattice plane distance (d002 ) by x-ray diffraction, 12m /g specific surface area by BET method, and 0.03-0.3ml/g total fine pore volume as the anode and a molded body containing activated carbon with 500m /g or higher specific surface area by BET method as the cathode.

4. 发明专利

JPH11297506A CONDUCTIVE COMPOSITION HAVING POSITIVE TEMPERATURE CHARACTERISTIC FOR RESISTANCE, IT MANUFACTURE, AND SELF TEMPERATURE CONTROLLABLE PLANAR HEATING ELEMENT 失效
公开(公告)号：JPH11297506A
公开(公告)日：1999-10-29
申请号：JP10605798
申请日：1998-04-16
申请人： UNITIKA LTD
发明人： MOTONAMI TOSHIYA , FUJIWARA YOSHIKAZU , WADA KAZUYO , TOMIOKA ISAO
IPC分类号： H05B3/14 , C08K3/04 , C08L79/08 , H01C7/02
摘要： PROBLEM TO BE SOLVED: To provide a conductive composition which has a large positive temperature characteristic of resistance in a high-temperature region, a method for manufacturing the composition, and a planar heating element using the composition and having self temperature controllability in the high-temperature region. SOLUTION: In a conductive composition prepared by scattering carbon powder in a thermoplastic resin and having a positive temperature characteristic of resistance, the carbon powder is composed of spheroidal glassy carbon and the thermosetting resin is composed of an aromatic polyimide, having a glass transition temperature of 200 deg.C or higher. In addition, the volume resistivity of the composition at a temperature equal to or higher than the glass transition temperature of the polyimide is two times or more as large as that of the composition at 25 deg.C.

5. 发明专利

JPH11214203A POSITIVE TEMPERATURE COEFFICIENT ELEMENT AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH11214203A
公开(公告)日：1999-08-06
申请号：JP1662898
申请日：1998-01-29
申请人： UNITIKA LTD
发明人： KAJIMARU HIROSHI , ITO AKIRA , WADA KAZUYO , TOMIOKA ISAO
IPC分类号： H01C7/02
摘要： PROBLEM TO BE SOLVED: To provide a positive temperature coefficient element which has extremely low specific resistance at 20 deg.C, large specific resistance at a peak temperature, abruptly increasing specific resistance in a narrow temperature range, and therewith excellent adhesion of electrode to conductive sheet. SOLUTION: A positive temperature coefficient element is characterized in that electrodes of metallic plate are formed on both surfaces of a conductive sheet consisting of a matrix of crystalline polymer and a conductive filler, and an adhesive layer of organic polymer is involved between the conductive sheet and the electrodes, and the peel strength of the electrodes to the conductive sheet is 0.5 kg/25 mm or more, and the specific resistance ρ20 at 20 deg.C is 5.0 Ω.cm or less, and the specific resistance ρp at peak temperature is 1.0×10 Ω.cm or more, and the difference between a temperature Ta ( deg.C) at which a specific resistance is 10 times the specific resistance ρ20 at 20 deg.C and a temperature Tb ( deg.C) at which a specific resistance is 10 times the specific resistance ρ20 at 20 deg.C [Ta ( deg.C)-Tb ( deg.C)] is 30 deg.C or less.

6. 发明专利

JPH1197011A NONAQUEOUS LITHIUM SECONDARY BATTERY 失效
公开(公告)号：JPH1197011A
公开(公告)日：1999-04-09
申请号：JP25172797
申请日：1997-09-17
申请人： UNITIKA LTD
发明人： MOTONAMI TOSHIYA , FUJIWARA YOSHIKAZU , WADA KAZUYO , TOMIOKA ISAO
IPC分类号： C01B31/02 , H01M4/587 , H01M10/05 , H01M10/0525 , H01M10/0566 , H01M4/58 , H01M4/02 , H01M10/40
摘要： PROBLEM TO BE SOLVED: To improve the charging/discharging capacity and the coulomb efficiency by using a carbonaceous material to be obtained by heating dihydro-1,3- benzooxazine compound in the inactive atmosphere or in vacuum at the specified temperature for either a positive electrode or a negative electrode. SOLUTION: A dihydro-1,3-benzooxazine compound has a structure to be expressed by formula. In the formula, (n) is 2, R is a phenyl radical, and R is carbonyl group. A carbonaceous material to be used as a negative electrode is obtained by heating the compound, and the temperature of heat treatment is in the range of 400 to 3000 deg.C. The carbonized material is chopped after heat treatment so as to be made into a powdered carbonaceous material. The powdered carbonaceous material can be easily obtained by previously taking out and chopping an intermediate product before the terminal temperature in heat treatment. The carbonaceous material is formed into an electrode by being mixed with polymer such as polyethylene.

7. 发明专利

JPH1126024A NONAQUEOUS LITHIUM SECONDARY BATTERY 失效
公开(公告)号：JPH1126024A
公开(公告)日：1999-01-29
申请号：JP18205597
申请日：1997-07-08
申请人： UNITIKA LTD
发明人： MOTONAMI TOSHIYA , WADA KAZUYO , TOMIOKA ISAO , ECHIGO YOSHIAKI
IPC分类号： H01M10/05 , C01B31/08 , H01M4/133 , H01M4/587 , H01M10/40 , H01M4/02 , H01M4/58
摘要： PROBLEM TO BE SOLVED: To provide a nonaqueous lithium secondary battery having good over-discharge characteristic in which drop of the capacity remains less, even in the case of over-discharging. SOLUTION: A secondary battery uses a lithium salt as electrolyte, and a negative electrode consists of a molding containing a carbon material prepared by subjecting a mixture of a thermosetting resin with a metal salt to a heat treatment, wherein the atomic ratio (N/C) of nitrogen to carbon is 0.001-0.03, the lattice spacing distance (d002 ) in X-ray diffraction is 3.65-4.00 Å, the specific surface area as per BET method ranges 1-25 m /g, and the total pore capacity is 0.03-0.3 ml/g, while the positive electrode consists of a molding, which contains activated carbon having a specific surface area as per BET method of over 500 m /g. When this battery is to be assembled, the amount of lithium carried by the negative electrode in advance is to be below an amount corresponding to 60% of the full charge capacity of the negative electrode.

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