公开(公告)号：US4958002A

公开(公告)日：1990-09-18

申请号：US211815

申请日：1988-06-27

申请人： Katsuo Imatani ,  Shinichirou Yamamoto ,  Genji Koga

发明人： Katsuo Imatani ,  Shinichirou Yamamoto ,  Genji Koga

IPC分类号： C07C51/573 ,  C08G73/10

CPC分类号： C08G73/1028 ,  C07C51/573 ,  C08G73/10

摘要： High purity crystals of a biphenyltetracarboxylic dianhydride produced by dehydration of a biphenyltetracarboxylic acid, which contain almost no biphenyltricarboxylic acid or its anhydride, or a small amount such as an amount of not more than 0.2 wt. %, are of value to produce an aromatic polyamic acid or polyimide having an increased high molecular weight. The high purity crystals of a biphenyltetracarboxylic dianhydride can be prepared from a biphenyltetracarboxylic acid by a dehydration process wherein the biphenyltetracarboxylic acid is heated under carefully controlled conditions.

公开(公告)号：US5262227A

公开(公告)日：1993-11-16

申请号：US707570

申请日：1991-05-30

申请人： Seiichirou Takabayashi ,  Katsuo Imatani ,  Kazuaki Mii ,  Shuji Watakabe

发明人： Seiichirou Takabayashi ,  Katsuo Imatani ,  Kazuaki Mii ,  Shuji Watakabe

IPC分类号： B32B15/08 ,  H05K1/00 ,  H05K1/03 ,  H05K3/38 ,  B32B7/02 ,  B29C47/00

CPC分类号： H05K3/386 ,  B32B15/08 ,  H05K1/0346 ,  H05K1/036 ,  H05K1/0393 ,  H05K2201/0154 ,  H05K2201/0195 ,  H05K2201/0355 ,  H05K2203/1545 ,  Y10T428/24967 ,  Y10T428/24975 ,  Y10T428/31681 ,  Y10T428/31721

摘要： An aromatic polyimide film directly laminated with a metal foil and an aromatic polyimide film directly laminated on both sides with a metal foil wherein the polyimide film (substrate) comprises an aromatic polyimide layer-A of 6-200 .mu.m thick whose polyimide is derived from a biphenyltetracarboxylic acid or its derivative and a phenylenediamine and an aromatic polyimide layer-B of 0.2-15 .mu.m thick whose polyimide is derived from an aromatic tetracarboxylic acid or its derivative and an aromatic diamine having plural benzene rings, and the polyimide layer-A has a thickness of not less than 55% of the total thickness of the aromatic polyimide substrate film, the polyimide layer-B is fixed to the polyimide layer-A under the condition that the layer-B cannot be peeled from the layer-A along the interface between these layers-A and -B and the metal foil is directly fixed on the surface of the polyimide layer-B via no adhesive.

公开(公告)号：US5221291A

公开(公告)日：1993-06-22

申请号：US786740

申请日：1991-11-01

申请人： Katsuo Imatani ,  Yuji Matsui

发明人： Katsuo Imatani ,  Yuji Matsui

IPC分类号： B24D3/28 ,  B24D11/00

CPC分类号： B24D3/28

摘要： An abrasive sheet having a high flexibility, mechanical strength and heat resistance, comprises (A) a matrix comprising an aromatic polyimide resin and (B) abrasive grains having an average size of 65-150 .mu.m and evenly dispersed in an amount of 2 to 50% by weight in the matrix, and is produced by forming a thin liquid layer from a dispersion comprising an aromatic polyamic acid solution with a rotation viscosity of 3000 to 6000 poises at 30.degree. C. and the above-mentioned abrasion grains dispersed in the solution, and dry-solidifying the liquid layer of the dispersion while imidizing the aromatic polyamic acid to a corresponding aromatic polyimide, the abrasive sheet having a thickness of 1.1 to 3.0 times the average size of the abrasive grains.

公开(公告)号：US4895596A

公开(公告)日：1990-01-23

申请号：US208751

申请日：1988-06-17

申请人： Katsuo Imatani ,  Akira Ishikawa ,  Masaki Kashibe

发明人： Katsuo Imatani ,  Akira Ishikawa ,  Masaki Kashibe

IPC分类号： B01J38/00 ,  B01J23/96 ,  B01J31/22 ,  C07B61/00 ,  C07C69/76 ,  C22B7/00 ,  C22B11/00

CPC分类号： C22B11/048 ,  C22B7/009 ,  Y02P10/214

摘要： An improved method of recovering a palladium catalyst from a liquid reaction mixture having been produced by oxidative coupling reaction of an aromatic compound in the presence of a catalyst containing palladium(II) salt is disclosed. The improved method comprises heating the liquid reaction mixture under stirring at a temperature of 180.degree. to 280.degree. C. in an atmosphere containing hydrogen gas at a partial pressure of 5 to 60 kg/cm.sup.2 whereby reducing the catalyst in the reaction mixture and precipitating a metallic palladium from the reaction mixture.

摘要翻译： 公开了一种通过在含有钯（II）盐的催化剂的存在下通过芳族化合物的氧化偶联反应制备的液体反应混合物中回收钯催化剂的改进方法。 改进的方法包括在分压为5至60kg / cm2的含氢气氛中，在180-280℃的温度下搅拌加热液体反应混合物，由此使反应混合物中的催化剂还原并沉淀 来自反应混合物的金属钯。

公开(公告)号：US5308569A

公开(公告)日：1994-05-03

申请号：US798532

申请日：1991-11-26

申请人： Toshikazu Hamamoto ,  Hiroshi Inoue ,  Yoshiyuki Miwa ,  Tetsuji Hirano ,  Katsuo Imatani ,  Kenji Matsubara ,  Takashi Kohno

发明人： Toshikazu Hamamoto ,  Hiroshi Inoue ,  Yoshiyuki Miwa ,  Tetsuji Hirano ,  Katsuo Imatani ,  Kenji Matsubara ,  Takashi Kohno

IPC分类号： B29C41/24 ,  B29D7/01 ,  C08G73/10 ,  C08J5/18 ,  B29C39/14

CPC分类号： C08J5/18 ,  B29C41/24 ,  B29D7/01 ,  C08G73/1028 ,  B29K2079/08 ,  C08J2379/08

摘要： A process for the preparation of an aromatic polyimide film includes the steps of casting a polyamide acid solution containing an imidization agent on a support in the form of a film, heating the filmy cast solution on the support at a temperature of 80.degree. to 200.degree. C. to obtain a self-supportable film; peeling the self-supportable film from the support; and further heating the film at a temperature of not lower than 300.degree. C. The polyamide acid solution includes a polyamide acid obtained by polymerization reaction of 3,4,3',4'-biphenyltetracarboxylic dianhydride and p-phenylenediamine in a mixture of a polar organic solvent and a small amount of an imidization agent selected from imidazole, a substituted imidazole, benzimidazole, a substituted benzimidazole, isoquinoline, and a substituted pyridine.

摘要翻译： 制备芳族聚酰亚胺膜的方法包括以下步骤：将含有酰亚胺化剂的聚酰胺酸溶液以薄膜形式在载体上浇铸，在80℃至200℃的温度下将薄膜状溶液加热到载体上 C.获得自我支持的电影; 从支撑体剥离自支撑膜; 并在不低于300℃的温度下进一步加热该膜。聚酰胺酸溶液包括通过3,4,3'，4'-联苯四羧酸二酐和对苯二胺的聚合反应获得的聚酰胺酸 极性有机溶剂和少量的选自咪唑，取代的咪唑，苯并咪唑，取代的苯并咪唑，异喹啉和取代的吡啶的酰亚胺化剂。