HEAT RESISTANT JIG USING POLYIMIDE RESIN CRYSTALLIZED IN DIE

HEAT RESISTANT JIG USING POLYIMIDE RESIN CRYSTALLIZED IN DIE

PROBLEM TO BE SOLVED: To provide a jig excellent in chemical resistance and heat resistance by forming the jig of a crystalline polyimide resin having a specific repeated structural unit, with logarithmic viscosity in a specified range. SOLUTION: A crystalline polyimide resin forming a heat resistan...

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Bibliographische Detailangaben
Hauptverfasser: YOSHIDA IKUNORI, YANAGIHARA KAYAKO, YOSHIMURA MASAJI
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
CHEMISTRY
COMBINED OPERATIONS
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
MACHINE TOOLS
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
OTHER WORKING OF METAL
PERFORMING OPERATIONS
SEMICONDUCTOR DEVICES
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
UNIVERSAL MACHINE TOOLS
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a jig excellent in chemical resistance and heat resistance by forming the jig of a crystalline polyimide resin having a specific repeated structural unit, with logarithmic viscosity in a specified range. SOLUTION: A crystalline polyimide resin forming a heat resistant jig and having a repeated structural unit expressed by formula 1 is obtained by dehydrating co-condensing diamine expressed by formula 2 and tetracarboxylic acid bi-anhydride expressed by formula 3. The molecular weight of this crystalline polyimide is in a range of 0.1-3.0 dl/g at logarithmic viscosity (ηinh). In the case of being less than 0.1 dl/g, the molecular weight is low, and strength serving as a jig cannot be sufficiently displayed. In the case of exceeding 3.0 dl/g, the molecular weight is so high as to make fusion molding such as injection molding difficult.