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AssigneeToyo Seikan Group Holdings, Ltd.
InventorsKouta Segami, Kazunobu Watanabe, Yusuke Kobayashi
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An addition reaction type polyimide resin molded body having a thickness of 5 mm or more, with a number of defects having a size of 0.5 mm or more present on the entire surface of the molded body being 1 per 100 cm2 or less. The addition reaction type polyimide resin molded body is formed by: holding a prepolymer of an addition reaction type polyimide resin at a temperature equal to or higher than a viscosity increase starting temperature of the addition reaction type polyimide resin and increasing a melt viscosity at a temperature lower by 10° C. than the viscosity increase starting temperature to 70 to 900 kPa·s; grinding and mixing the addition reaction type polyimide resin to form a molding precursor; and shaping the molding precursor at a temperature equal to or higher than a heat-curing temperature of the addition reaction type polyimide resin.
An addition reaction type polyimide resin molded body having a thickness of 5 mm or more, wherein a number of defects having a size of 0.5 mm or more present on an entire surface of the molded body is 1 per 100 cm2 or less.
An addition reaction type polyimide resin molded body having a thickness of 15 mm or more, wherein the addition reaction type polyimide resin molded body has a bending strength of 60 MPa or more.
A method for producing an addition reaction type polyimide resin molded body, the method comprising:
A molding precursor comprising an addition reaction type polyimide resin, wherein the addition reaction type polyimide resin has a melt viscosity of 70 to 900 kPa·s at a temperature lower by 10° C. than a viscosity increase starting temperature of the addition reaction type polyimide resin.
Dependencies are inferred from the claim text.