| 摘要 |
This invention is a polyimide resin composition containing 100 parts by weight of polyimide having recurring units of the following general formula (I): (I) (where Y is a bond, divalent hydrocarbon radical having from 1 to 10 carbons, hexafluorinated isopropylidene radical, carbonyl radical, thio radical, sulfinyl radical, sulfonyl radical or oxide, and R is a tetra-valent radical of aliphatic radical having at least 2 carbons, cycloaliphatic radical, monoaromatic radical, condensed polyaromatic radical, or non-condensed polyaromatic radical wherein aromatic radicals are mutually connected with a bond or a crosslinking function) and from 5 to 100 parts by weight of fibrous reinforcing materials such as glass fibres, carbon fibres, potassium titanate fibres and aromatic polyamide fibres. The resin composition can provide molded products having excellent high-temperature stability, dimensional stability and mechanical strength, and is useful as the material for electric and electronic devices, precision instrument parts etc. Polyimide of this invention can be prepared from aromatic etherdiamined and tetracarboxylic acid dianhydrides. The aromatic etherdiamines are 4,4'-bis(3-aminophenoxy)biphenyl, 2,2-bis¢4-(3-amino-phenoxy)phenyl!propane, bis¢4-(3-aminophenoxy)phenyl! sulfide, etc. The tetracarboxylic acid dianhydrides are pyromellitic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, etc. |
