Title:
【発明の名称】芳香族ポリ酸無水物組成物
Document Type and Number:
Japanese Patent JP3121604
Kind Code:
B2
Abstract:
Aromatic anhydride copolymers containing at least two aromatic diacid units, which are soluble in chloroform or dichloromethane to concentrations between approximately 0.5 to 50% weight/volume, melt at temperatures below 180 DEG C, and have low crystallinity are disclosed. The copolymers may contain between 0 and approximately 30% aliphatic diacid units. All copolymers are insoluble in carbon tetrachloride, i.e., less than 0.1% polymer by weight/volume solvent). The desired properties are the result of adding between 10 and 90% of a second aromatic diacid, to the copolymer composition which introduces irregularity in the polymer chains that dramatically alter the polymer properties, decreasing the crystallinity and melting point and increasing the solubility in the common solvents, dichloromethane or chloroform. An additional decrease in Tg and MP, with an increase in flexibility, is obtained by adding small amount of aliphatic diacid, up to about 30%.
More Like This:
Inventors:
Abraham Jay Dome
Application Number:
JP22642890A
Publication Date:
January 09, 2001
Filing Date:
August 27, 1990
Export Citation:
Assignee:
Massachusetts Institute of Technology
International Classes:
A61K9/20; A61K9/70; C08G67/00; C08G67/04; C08L73/02; (IPC1-7): C08G67/04
Domestic Patent References:
| JP63258924A | ||||
| JP63199227A | ||||
| JP61109751A |
Attorney, Agent or Firm:
Shusaku Yamamoto