公开(公告)号：US5801269A

公开(公告)日：1998-09-01

申请号：US848367

申请日：1997-04-30

申请人： Carrie A. Feeney ,  Ida L. Jones ,  Bennett C. Ward ,  Thomas M. Kenesson ,  Charles B. Hilton ,  Michael R. Ahern ,  Gregory M. Adams ,  Edward M. de la Garza ,  B. Frank Wood, Jr. ,  Thomas L. Grantland ,  Kan J. Tsai ,  James L. Ragan

发明人： Carrie A. Feeney ,  Ida L. Jones ,  Bennett C. Ward ,  Thomas M. Kenesson ,  Charles B. Hilton ,  Michael R. Ahern ,  Gregory M. Adams ,  Edward M. de la Garza ,  B. Frank Wood, Jr. ,  Thomas L. Grantland ,  Kan J. Tsai ,  James L. Ragan

IPC分类号： C07C67/52 ,  C07C67/48

CPC分类号： C07C67/52

摘要： Processes for recovering 4,4'-dimethyl bibenzoate (DMBB) from byproduct streams of dimethyl terephthalate (DMT) production are disclosed. The byproduct streams are treated to produce an overhead stream which includes DMBB. In one aspect of the invention, the overhead product stream is added to an organic solvent under conditions sufficient to rapidly form a suspension of crystallized DMBB. In another aspect of the invention, the overhead is dissolved in an appropriate organic solvent and cooled to form a suspension of DMBB crystals in the solvent. A portion of the suspension is removed, and the remaining portion of the suspension centrifuged to recover DMBB crystals. In still another aspect of the invention, the overhead stream is treated with an organic solvent to form a slurry of DMBB crystals, and the resultant slurry thermally treated to increase the concentration of DMBB crystals therein while also solubilizing any organic contaminants.

摘要翻译： 公开了从对苯二甲酸二甲酯（DMT）生产副产物流中回收4,4'-二甲基苯甲酸酯（DMBB）的方法。 处理副产物流以产生包括DMBB的开销流。 在本发明的一个方面，在足以快速形成结晶DMBB悬浮液的条件下，将塔顶产物流加入到有机溶剂中。 在本发明的另一方面，将塔顶馏出物溶于合适的有机溶剂中并冷却以形成DMBB晶体在溶剂中的悬浮液。 将一部分悬浮液除去，并将悬浮液的剩余部分离心以回收DMBB晶体。 在本发明的另一方面，用有机溶剂处理塔顶馏出物以形成DMBB晶体的浆料，并将所得浆料热处理以增加其中DMBB晶体的浓度，同时也溶解任何有机污染物。

公开(公告)号：US5965273A

公开(公告)日：1999-10-12

申请号：US792333

申请日：1997-01-31

申请人： Lakshaman M. Walpita ,  Michael R. Ahern

发明人： Lakshaman M. Walpita ,  Michael R. Ahern

IPC分类号： B32B15/08 ,  C08K3/00 ,  C08L45/00 ,  C08L81/02 ,  H01B3/00 ,  H01B3/30 ,  H01B3/44 ,  H05K1/02 ,  H05K1/03 ,  H05K1/16 ,  B32B3/00

CPC分类号： H05K1/0373 ,  B32B15/08 ,  H01B3/301 ,  H05K1/0228 ,  H05K1/024 ,  H05K1/162 ,  H05K2201/0129 ,  H05K2201/015 ,  H05K2201/0209 ,  Y10S428/901 ,  Y10T428/25 ,  Y10T428/252 ,  Y10T428/256 ,  Y10T428/31678 ,  Y10T428/31692 ,  Y10T428/31855

摘要： A polymeric composition which has a dielectric constant K' greater than 4 at 20.degree. C. which varies little with temperature is made from a polymer or mixture of polymers and a ceramic or a mixture of ceramics, where the polymer or mixture of polymers has a dielectric constant K' in the range of about 1.5 to about 3.5 and a temperature coefficient of dielectric constant TCK' that is negative and is between 0 and about -300 ppm/degree C.; and the ceramic includes a first ceramic, which may be one ceramic or a mixture of ceramics, each having a dielectric constant in the range of about 15 to about 200 and a TCK' that is positive and is between zero and about 3000 ppm/degree C.; and an optional second ceramic, which may be one ceramic or a mixture of ceramics, each having a dielectric constant in the range from about 3 up to about 15 and a TCK' that is positive and is between zero and about 300 ppm/degree C.

摘要翻译： 在20℃下介电常数K'大于4的聚合物组合物与温度变化很小的聚合物组合物由聚合物或陶瓷或陶瓷混合物的聚合物或混合物制成，其中聚合物或聚合物混合物具有 介电常数K'在约1.5至约3.5的范围内，介电常数TCK'的温度系数为负，介于0和约-300ppm /℃之间; 并且陶瓷包括第一陶瓷，其可以是一种陶瓷或陶瓷的混合物，每种陶瓷或陶瓷的混合物的介电常数在约15至约200的范围内，TCK'为正，为零至约3000ppm /度之间 C。; 和可选的第二陶瓷，其可以是一种陶瓷或陶瓷的混合物，每种陶瓷或陶瓷的混合物的介电常数在约3至约15的范围内，TCK'为正，为零至约300ppm /℃之间 。