Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1998-12-21
2000-08-15
Woodward, Ana
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524451, 524495, 524538, 525432, 525436, C08L 7908
Patent
active
061038067
ABSTRACT:
A polyimide resin composition is disclosed herein which comprises 5 to 60% by weight of a polyimide [polyimide (1)] having a repeating unit represented by the chemical formula 1 and 40 to 95% by weight of a polyimide [polyimide (2)] having a repeating unit represented by the chemical formula 2. According to the present invention, there are provided a polymer alloy in which the advantages of the polyimide (1) and the polyimide (2) are utilized and the disadvantages of the polyimide (1) and the polyimide (2) are reduced; a polyimide resin composition from which crystalline molded articles can be obtained even by a usual molding cycle, for example, an injection molding cycle of about 30 to 60 seconds; and a polyimide resin composition from which molded articles having an excellent dimensional accuracy and flexural modulus can be obtained even by a usual molding cycle, for example, an injection molding cycle of about 30 to 60 seconds, for example, in the case that the molded articles are intended to be used at a high temperature of 230.degree. C. or more, for example, a temperature of 230 to 300.degree. C., or 230 to 250.degree. C.
REFERENCES:
patent: 4847311 (1989-07-01), Yamaya et al.
patent: 4847349 (1989-07-01), Ohta et al.
B. Hsiao et al, Crystalline Homopolyimides and Copolyimides Derived from 3,3',4,4'-Biphenyltetracarboxylic Dianhydride/1,3-Bis(4-aminophenyoxy)benzene/1,12-Dodecanediamine. 2. Crystallization, Melting, and Morphology, Macromolecules, 1996, 29, pp. 135-142.
Kido Hiroyasu
Koba Tomohito
Oikawa Hideaki
Tamai Shoji
Yanagihara Kayako
Mitsui Chemicals Inc.
Woodward Ana
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