Polyimide fiber sheet
AssigneesDu Pont-Toray Co., Ltd., Toyota Tsusho Matex Corporation, Hirose Paper Mfg Co., Ltd.
InventorsHideaki Machida, Shotaro Hidaka, Takaharu Kuno, Naruaki Takahashi, Gen Ueta
Life of this patent
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Abstract
A polyimide fiber paper-manufacturing method is provided that includes a short fiber-preparing step in which shaved short fibers of a non-thermoplastic polyimide are prepared, and a provisionally-bonded paper-forming step in which the short fibers are mixed with water-soluble polymers which are a material having a decomposition temperature lower than a glass transition point of polyimide, and subjected to wet-papermaking to form provisionally-bonded paper.
Claims15
A polyimide fiber paper-manufacturing method, comprising:
- a short fiber-preparing step in which shaved short fibers of a non-thermoplastic polyimide are prepared;
- and
- a provisionally-bonded paper-forming step in which the shaved short fibers are mixed into a solution of water-soluble polymers which are a material having a decomposition temperature lower than a glass transition point of the polyimide, and subjected to wet-papermaking to form provisionally-bonded paper to which the shaved short fibers are provisionally bonded,
- wherein the shaved short fibers are mutually bonded due to imidization of a polyimide precursor, and
- the water-soluble polymers are removed by heat-treating after the provisionally-bonded paper-forming step.
A polyimide fiber paper-manufacturing method, comprising:
- a short fiber-preparing step in which shaved short fibers of a non-thermoplastic polyimide are prepared;
- a provisionally-bonded paper-forming step in which the shaved short fibers are mixed into a solution of water-soluble polymers which are a material having a decomposition temperature lower than a glass transition point of the polyimide, and subjected to wet-papermaking to form provisionally-bonded paper to which the shaved short fibers are provisionally bonded;
- and
- a polyimide precursor-dispersing step in which a polyimide precursor is dispersed in the provisionally-bonded paper after the provisionally-bonded paper-forming step,
- wherein, when the polyimide precursor is dispersed in the provisionally-bonded paper, the shaved short fibers are mutually bonded due to imidization of the polyimide precursor, and
- the water-soluble polymers are removed by heat-treating after the provisionally-bonded paper-forming step.
A polyimide fiber paper-manufacturing method, comprising:
- a short fiber-preparing step in which shaved short fibers of a non-thermoplastic polyimide are prepared;
- a provisionally-bonded paper-forming step in which the shaved short fibers are mixed into a solution of water-soluble polymers which are a material having a decomposition temperature lower than a glass transition point of the polyimide, and subjected to wet-papermaking to form provisionally-bonded paper to which the shaved short fibers are provisionally bonded;
- and
- a polyimide solution-dispersing step in which a polyimide solution, in which a polyimide precursor is contained, is dispersed in the provisionally-bonded paper after the provisionally-bonded paper-forming step,
- wherein, when the polyimide precursor is dispersed in the provisionally-bonded paper, the shaved short fibers are mutually bonded due to imidization of the polyimide precursor, and
- the water-soluble polymers are removed by heat-treating after the provisionally-bonded paper-forming step.
Dependencies are inferred from the claim text.