THRUSTWASHER COMPRISING IM-MOLD CRYSTALLIZING POLYIMIDE RESIN

PROBLEM TO BE SOLVED: To obtain a molded article showing excellent surface smoothness and good slidability by forming a crystalline polyimide resin having a logarithmic viscosity in a specific range. SOLUTION: A fiber-reinforced resin composition comprises 100 pts.wt. of a crystalline polyimide resi...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHIDA IKUNORI, YANAGIHARA KAYAKO, YOSHIMURA MASAJI
Format:	Patent
Sprache:	eng
Schlagworte:	BEARINGS BLASTING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING LUBRICATING MECHANICAL ENGINEERING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THEIR PREPARATION OR CHEMICAL WORKING-UP THERMAL INSULATION IN GENERAL USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a molded article showing excellent surface smoothness and good slidability by forming a crystalline polyimide resin having a logarithmic viscosity in a specific range. SOLUTION: A fiber-reinforced resin composition comprises 100 pts.wt. of a crystalline polyimide resin having a repeating unit represented by formula I and a logarithmic viscosity of 0.1-3.0 dl/g and 5-100 pts.wt. of a fibrous reinforcement such as a carbon fiber, a glass fiber, etc. A molded article is obtained by crystallizing said resin composition in a mold heated at 180-280 deg.C during injection molding. The polyimide resin is obtained by making a diamine represented by formula II react on a tetracarboxylic acid dianhydrides represented by formula III in a solvent such as N,N'-diethylacetamide at an ambient temperature to 250 deg.C in an equivalent ratio of the tetracarboxylic acid to the diamine of 0.90-0.99 to produce a polyamide acid as a precursor and then heating the precursor at 100-300 deg.C for imide reaction.