公开(公告)号：US5747602A

公开(公告)日：1998-05-05

申请号：US777064

申请日：1996-12-30

申请人： Takashi Namba ,  Hiroya Kobayashi ,  Kenji Minami ,  Hiroshi Itoh ,  Toshiaki Kuriyama ,  Masashi Yukitake

发明人： Takashi Namba ,  Hiroya Kobayashi ,  Kenji Minami ,  Hiroshi Itoh ,  Toshiaki Kuriyama ,  Masashi Yukitake

IPC分类号： C08G4/00 ,  C08G65/12 ,  C08G65/16 ,  C08G65/26 ,  C08G65/30 ,  C09D171/00 ,  C08G2/06 ,  C08G2/12 ,  C08L59/04

CPC分类号： C08G65/2666 ,  C08G4/00 ,  C08G65/12 ,  C08G65/16 ,  C08G65/30 ,  C09D171/00

摘要： A process for producing a high-molecular-weight polydioxolane, which includes the steps of: polymerizing 1,3-dioxolane using a polymerization catalyst comprising a heteropolyacid and a ketone; and neutralizing the resulting polymerization reaction product using an organic amine and/or ammonia. A hydrophilic film, which includes a resin including a polydioxolane and having a particular molecular weight and has a particular crystallinity and a particular spherulite's size. A film crumbly in cold water is produced by forming a film under particular forming conditions from a resin including a polydioxolane and having a particular molecular weight, or by subjecting an already formed film to particular thermal hysteresis.

摘要翻译： 一种制备高分子量聚二氧戊环的方法，其包括以下步骤：使用包含杂多酸和酮的聚合催化剂聚合1,3-二氧戊环; 并使用有机胺和/或氨中和所得的聚合反应产物。 一种亲水膜，其包括包含聚二氧戊环并具有特定分子量并具有特定结晶度和特定球晶尺寸的树脂。 通过在特定形成条件下由包含聚二氧杂环戊烷并具有特定分子量的树脂形成薄膜，或通过使已经形成的薄膜经受特定的热滞后而产生薄膜中的冷水。

公开(公告)号：US5391700A

公开(公告)日：1995-02-21

申请号：US233649

申请日：1994-04-26

申请人： Hiroshi Itoh ,  Takashi Namba ,  Hiroya Kobayashi ,  Masashi Yukitake

发明人： Hiroshi Itoh ,  Takashi Namba ,  Hiroya Kobayashi ,  Masashi Yukitake

IPC分类号： C08G63/42

CPC分类号： C08G63/42

摘要： This invention provides a process for producing with industrially good efficiency a polyester having a high melting point and biodegradability. In this process, ring-opening copolymerization of a cyclic acid anhydride containing succinic anhydride as a main component with a cyclic ether containing ethylene oxide as a main component is carried out in the presence of a catalyst by introducing successively the cyclic ether into a reaction vessel containing the cyclic acid anhydride in a melting state or solution state. The rate per hour of introducing the cyclic ether is within the range of 3 to 90 parts by weight per 100 parts by weight of the cyclic acid anhydride, and the reaction vessel has an inside pressure within the range of atmospheric pressure to 50 kgf/cm.sup.2 as a gauge pressure.

摘要翻译： 本发明提供了具有高效率的具有高熔点和生物降解性的聚酯的工业生产方法。 在该方法中，以含有环氧乙烷为主要成分的环状醚作为主要成分的环状酸酐以环氧乙烷为主要成分的开环共聚在催化剂的存在下进行，连续将环状醚引入反应容器 含有处于熔融状态或溶液状态的环状酸酐。 环状醚的引入速度为每100重量份环状酸酐为3〜90重量份，反应容器的内部压力为大气压至50kgf / cm2 作为表压。

公开(公告)号：US5026800A

公开(公告)日：1991-06-25

申请号：US371175

申请日：1989-06-26

申请人： Kazumasa Kimura ,  Kinya Nagasuna ,  Takashi Namba ,  Kenji Kadonaga ,  Koji Miyake ,  Tadao Shimomura

发明人： Kazumasa Kimura ,  Kinya Nagasuna ,  Takashi Namba ,  Kenji Kadonaga ,  Koji Miyake ,  Tadao Shimomura

IPC分类号： C08F220/06 ,  A61L15/24 ,  C08F2/08 ,  C08F2/32

CPC分类号： C08J3/12 ,  C08F2/32 ,  C08J2300/14

摘要： Water-absorbent resins having an average particle diameter of 100 to 600 .mu.m and a particle diameter distribution of 0.35 or less are prepared by polymerizing an aqueous solution of a water-soluble ethylenically unsaturated monomer, pulverizing and sieving the gel-like polymer so obtained, and crosslinking the surface of the polymer powder. In an alternative process, an aqueous solution of the monomer having a viscosity greater than 15 cps is dispersed in a hydrophobic organic solvent and polymerized to obtain a polymer powder, and the surface of the polymer powder is crosslinked.