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41. 发明专利

JPH08126840A COMPOSITE SHEET CONTAINING POWDERY ACTIVE CARBON AND ITS PRODUCTION 失效
公开(公告)号：JPH08126840A
公开(公告)日：1996-05-21
申请号：JP28863794
申请日：1994-10-31
申请人： UNITIKA LTD
发明人： SAWARA TETSUYA , WASHIMI TAKAHIRO , ITO AKIRA , IWAYA YOSHIAKI
IPC分类号： C02F1/28 , B01J20/20 , B01J20/28 , C08K3/02 , C08K3/04 , C08L101/00 , D01F8/04 , D21H13/12 , D21H13/14
摘要： PURPOSE: To produce a composite sheet maintaining high adsorbing performance, less liable to contamination, excellent in handleability and less liable to the falling of powdery active carbon by vibration as a sheet contg. uniformly dispersed powdery active carbon having satisfactory adsorbing performance. CONSTITUTION: Heat fusible conjugated fibers are composed of a low m.p. resin and a high m.p. resin, 10-100 pts.wt. of the fibers are uniformly mixed with 0.5-15 pts.wt. synthetic pulp, and 100 pts.wt. powdery active carbon is bonded to the resultant mixture in a uniformly dispersed state by the fusion of the low m.p. resin to obtain the objective composite sheet having 20-90vol.% porosity.

42. 发明专利

JPH0794018A CONDUCTIVE COMPOUND 失效
公开(公告)号：JPH0794018A
公开(公告)日：1995-04-07
申请号：JP26196893
申请日：1993-09-24
申请人： UNITIKA LTD
发明人： KAJIMARU HIROSHI , ITO AKIRA , ASAMI KEIICHI , IWAYA YOSHIAKI
IPC分类号： C08J5/00 , C08K3/04 , C08L23/04 , H01B1/24
摘要： PURPOSE:To provide a conductive compound having a positive temperature characteristic coefficient (PTC) having a large maximum change rate of resistance in a narrow temperature range by using ultra-high molecular weight polyethlene and powder-state glassy carbon. CONSTITUTION:A conductive compound is manufactured by mixing the given ultrta-high molecule quantity and that of powder-state glassy carbon having a given mean particle diameter to be compression-molded under heating. Mold lubricant, antioxidant, and a filler such as CaCO3 are added as required. This constitution provides a conductive complex excellent in electric resistance and having a large ratio between the maximum and the minimum values of resistance within a very narrow temperature range and a positive temperature coefficient.

43. 发明专利

JP2003183966A POLYIMIDE NONWOVEN FABRIC HAVING IMPROVED TEXTURE AND METHOD FOR PRODUCING POLYIMIDE NONWOVEN FABRIC 审中-公开
公开(公告)号：JP2003183966A
公开(公告)日：2003-07-03
申请号：JP2001377358
申请日：2001-12-11
申请人： UNITIKA LTD
发明人： YAMADA YOSHIHISA , TOMA KATSUYUKI , ITO AKIRA , FURUKAWA MIKIO
IPC分类号： D04H1/4342 , D21H13/26 , D04H1/42
摘要： PROBLEM TO BE SOLVED: To provide a polyimide nonwoven fabric having an improved texture and a method for production of the polyimide nonwoven fabric. SOLUTION: This polyimide nonwoven fabric comprises polyimide short fibers and has ≤100 g/m 2 weight. The unevenness of the weight measured by the method is ≤15%. The method for producing the polyimide nonwoven fabric comprises preparing a slurry dispersing the polyimide short fibers dispersed and forming the nonwoven fabric by a wet process. A polyester is contained in the slurry. COPYRIGHT: (C)2003,JPO

44. 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.

45. 发明专利

JPH10335113A PTC DEVICE 失效
公开(公告)号：JPH10335113A
公开(公告)日：1998-12-18
申请号：JP14508797
申请日：1997-06-03
申请人： UNITIKA LTD
发明人： KAJIMARU HIROSHI , ITO AKIRA , TOMIOKA ISAO , ECHIGO YOSHIAKI
IPC分类号： H01C7/02
摘要： PROBLEM TO BE SOLVED: To provide a PTC device showing a very small resistivity at 20 deg.C, a large resistivity at the peak time, a quick rise of resistivity in a narrow temperature range, and having a coefficient of elasticity hardly deformed by external force. SOLUTION: This PTC device is provided with a matrix of crystalline polyolefin and a conductive sheet made by a conductive filler and a reinforcing whisker and is provided by electrodes on its both sides. The resistivity ρ20 at 20 deg.C is 1.8Ω.cm or less, the resistivity ρp at peak time is 2.0×10 Ω.cm or more, the temperature difference [Ta( deg.C)-Tb( deg.C)] (where Ta: the temperature when resistivity becomes 10 times the resistivity ρ20 at 20 deg.C, Tb: the temperature when resistivity becomes 10 times the resistivity ρ20 at 20 deg.C) is 50 deg.C or lower, and the flexual elasticity coefficient of the conductive sheet is 350 kg/mm or more.

46. 发明专利

JPH08117530A NETLIKE PLASTIC PERFORATED ELEMENT AND PRODUCTION THEREOF 失效
公开(公告)号：JPH08117530A
公开(公告)日：1996-05-14
申请号：JP27983294
申请日：1994-10-20
申请人： UNITIKA LTD
发明人： SAWARA TETSUYA , ITO AKIRA , KAWATO KAYOKO , IWAYA YOSHIAKI
IPC分类号： B01D39/08 , B01D46/10 , B29D28/00 , B29K105/04
摘要： PURPOSE: To obtain a netlike plastic perforated element reduced in pressure loss without generating the waste of a sheet due to punching while holding the voids of the sheet. CONSTITUTION: Rows A each consisting of a large number of slits with a definite length (a) laterally arranged at a definite interval (d) and rows B each consisting of a large number of slits with a definite length (a) laterally arranged at a definite interval (d) so that the positions of the respective slits are shifted by (a+d)/2 with respect to the slits of the rows A are alternately and parallelly arranged to a porous sheet composed of a composite fiber consisting of a low m.p. resin and a high m.p. resin and having voids of 20-90vol.% at a definite interval. After the sheet is slitted, tension is applied to the sheet in the direction right-angled to the slits to stretch the sheet and, in this state, the sheet is thermally fixed within a temp. range from the m.p. of the low m.p. resin to the m.p. of the high m.p. resin to be molded into a netlike shape.

47. 发明专利

JPH08902A COMPOSITE SHEET AND ITS PRODUCTION 失效
公开(公告)号：JPH08902A
公开(公告)日：1996-01-09
申请号：JP14296594
申请日：1994-06-24
申请人： UNITIKA LTD , AKOU KASEI KK
发明人： ITO AKIRA , IWAYA YOSHIAKI , NAKAGAWA KOJI , YOKOYAMA YOSHITO
IPC分类号： B01D15/00 , C02F1/28 , C02F1/58 , C08J5/00 , D01F8/00 , D01F9/00 , D04H13/00
摘要： PURPOSE:To prepare a composite sheet containing calcium sulfite capable of being utilized as a residual chlorine removing agent in tap water and excellent in handling properties. CONSTITUTION:This composite sheet consists of calcium sulfite (A) and a reinforcing fiber and a matrix resin, a heat-fusible org. fiber or a heat-fusible org. fiber and a matrix resin (B) and has open voids and the voids thereof are 20-95vol.%. This sheet is used as a chlorine removing agent.

48. 发明专利

JP2000239524A FIBER-REINFORCED POLYIMIDE RESIN COMPOSITION AND ITS PRODUCTION 失效
公开(公告)号：JP2000239524A
公开(公告)日：2000-09-05
申请号：JP3969899
申请日：1999-02-18
申请人： UNITIKA LTD
发明人： ITO AKIRA , TOMIOKA ISAO
IPC分类号： C08J5/04 , C08G73/10 , C08K7/02 , C08L79/08
摘要： PROBLEM TO BE SOLVED: To obtain the subject polyimide resin composition capable of providing a fiber-reinforced polyimide resin molding product excellent in reinforcing effect by reinforced fiber and in secondary moldability and processability. SOLUTION: This composition is obtained by dispersing (B) a reinforcing fiber (e.g. carbon fiber) having =6 mm average fiber length into (A) a linear aromatic polyimide resin at (95:5) to (35:65) weight ratio of the component A/the component B. The component A comprises an aromatic carboxylic acid component and an aromatic diamine component, and e.g. linear aromatic polyimide composed of pyromellitic acid component and 4,4'-bis(meta-aminophenoxy)-biphenyl component is preferably used as the component A. Average fiber length and average fiber diameter of the component B mean average value of fiber length and fiber diameter of 100 fiber numbers among >=100 fiber numbers observed by microscope.

49. 发明专利

JP2000239433A PREPARATION OF SYNTACTIC FOAM 失效
公开(公告)号：JP2000239433A
公开(公告)日：2000-09-05
申请号：JP3969999
申请日：1999-02-18
申请人： UNITIKA LTD
发明人： ITO AKIRA , TOMIOKA ISAO
IPC分类号： C08J9/32
摘要： PROBLEM TO BE SOLVED: To provide a preparation process of a syntactic foam having an excellent heat resistance and processibility. SOLUTION: In a preparation process of a syntactic foam, a microballoon is dispersed in a solution of a linear aromatic polyimide precursor having a solid content of 60 wt.% or larger, a solvent is removed from the obtained dispersion, and the polyimide precursor is imidized to obtain a polyimide resin. The obtained polyimide resin is ground into a powder, which is then heat molded.

50. 发明专利

JP2000124005A PTC ELEMENT AND ITS MANUFACTURE 失效
公开(公告)号：JP2000124005A
公开(公告)日：2000-04-28
申请号：JP29648998
申请日：1998-10-19
申请人： UNITIKA LTD
发明人： ITO AKIRA , TOMIOKA ISAO
IPC分类号： H01C7/02
摘要： PROBLEM TO BE SOLVED: To provide a PTC(positive temperature coefficient) element, the specific resistance of which abruptly rises in a narrow temperature range and which has a superior corrosion resistance, and then in which electrodes are highly tightly adhered to a conductive sheet. SOLUTION: A PTC element is provided with electrodes on both surfaces of a conductive sheet composed of a crystalline polyolefin matrix, and a conductive filler and the specific resistance of the element is adjusted so that the difference [Ta( deg.C)-Tb( deg.C)] between the temperature Ta, at which the specific resistance of the element becomes 106 times as high as ρ20 and the temperature Tb at which the specific resistance becomes 10 times as high as ρ20 is 10 deg.C or smaller. The electrodes are composed of metallic sheets formed through nickel-phosphorus plating.

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