Process for preparation of 3,3'- or 3,4'-diamino benzophenone
申请人:Mitsui Toatsu Chemicals, Inc.
公开号:US04556738A1
公开(公告)日:1985-12-03
3,3'- or 3,4'-diamino benzophenone is prepared by catalytically reducing and dehalogenating, in the presence of a reduction catalyst and a dehydrohalogenation agent, a benzophenone compound or benzophenone compounds of the general formula ##STR1## in which X is a halogen atom at position 2 or 4 of the benzene ring and Y is hydrogen or a halogen atom and in which the nitro group is at position 3' or 4' of the benzene ring if Y is hydrogen, while Y is at position 4' and the nitro group is at position 3' of the benzene ring if Y is a halogen atom.
The present invention relates to drug delivery systems comprising ocular implant, which include organic molecules, capable of modulating tyrosine kinase signal transduction in order to regulate, modulate and/or inhibit abnormal cell proliferation, in combination with a polymer, which polymer serves to control, modify, modulate and/or slow the release of the therapeutic component into the environment of the eye in which said composite is placed.
This invention relates to a novel thermoplastic and amorphous polyimide which is readily soluble in organic solvent, a novel aromatic diamino compound used for the polyimide, and a preparation process thereof.
The polyimide comprise a requisite structural unit having one or more recurring structural units of the formula:
wherein m and n are individually an integer of 0 or 1, and R is
The polyimide of the invention is essentially amorphous, excellent in melt flow stability in the decreased temperature as compared with conventionally known polyimide and has greatly improved processability.
The polyimide of the invention obtained by using a novel aromatic diamino compound as a monomer can control various properties such as melt flow ability and solubility in solvents by side chains and not by principal chain of polyimide. Thus, excellent melt flow property and solubility in solvents can be obtained while maintaining high heat resistance and adhesive property which are derived from benzophenone structure of the diamino compound of the the invention.
本发明涉及一种易溶于有机溶剂的新型热塑性无定形聚酰亚胺、一种用于聚酰亚胺的新型芳香族二氨基化合物及其制备工艺。
该聚酰亚胺包括一个必要的结构单元,该结构单元具有一个或多个式中的重复结构单元:
其中 m 和 n 分别是 0 或 1 的整数,R 是
本发明的聚酰亚胺基本上是无定形的,与传统已知的聚酰亚胺相比,在温度降低时熔体流动稳定性极佳,而且加工性能大大提高。
使用新型芳香族二氨基化合物作为单体得到的本发明聚酰亚胺可以通过侧链而不是聚酰亚胺的主链来控制熔体流动能力和在溶剂中的溶解度等各种性能。因此,在保持本发明二氨基化合物的二苯甲酮结构所产生的高耐热性和粘合性的同时,还能获得优异的熔体流动性能和在溶剂中的溶解性。