Method of producing a porous product
First Claim
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1. A method of producing a porous product, comprising the steps of:
- preparing a molded product by subjecting a molding material containing a polymer component and a pore-forming agent dispersed in the polymer component, the pore-forming agent assuming a solid state at a room temperature, to molding at a temperature which causes the molding material having the pore-forming agent to substantially completely melt; and
soaking the molded product with a solvent which dissolves the pore-forming agent but fails to dissolve the polymer component, to form pores, wherein the pore-forming agent is a polyvalent alcohol having a melting point of 40°
C. to 300°
C. that melts at the molding temperature of the polymer component, and the molded product is prepared by injection molding or extrusion molding.
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Abstract
A novel method of producing a porous product is provided, including the steps of: preparing a molded product by subjecting a molding material comprising a polymer component and a pore-forming agent dispersed in the polymer component, the pore-forming agent assuming a solid state at a room temperature, to molding at a temperature which causes the pore-forming agent to melt; and soaking the molded product with a solvent which dissolves the pore-forming agent but fails to dissolve the polymer component, to form pores.
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Citations
8 Claims
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1. A method of producing a porous product, comprising the steps of:
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preparing a molded product by subjecting a molding material containing a polymer component and a pore-forming agent dispersed in the polymer component, the pore-forming agent assuming a solid state at a room temperature, to molding at a temperature which causes the molding material having the pore-forming agent to substantially completely melt; and
soaking the molded product with a solvent which dissolves the pore-forming agent but fails to dissolve the polymer component, to form pores, wherein the pore-forming agent is a polyvalent alcohol having a melting point of 40°
C. to 300°
C. that melts at the molding temperature of the polymer component, and the molded product is prepared by injection molding or extrusion molding.- View Dependent Claims (2, 3, 4, 5, 6, 7)
the content of the pore-forming agent ranges from 50 to 99 vol % based on the volume of the molding material, and the porous product has a porosity from 50 to 99% by volume.
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8. A method of producing a porous product comprising the steps of:
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forming a molding material in which pentaerythritol is dispersed in a thermoplastic resin or a thermoplastic elastomer into a molded product by molding the molding material at 180°
C. or more so as to cause the molding material and the pentaerythritol to substantially completely melt; and
soaking the molded product with water to form pores in the molded product.
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Specification
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Current AssigneeAsahi Rubber Inc., Plinst Giken Co., Ltd.
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Original AssigneeAsahi Rubber Inc., Plinst Giken Co., Ltd.
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InventorsMaeda, Mizuho, Nemoto, Masashi, Takamatsu, Hideo, Otani, Kunihiko, Takagi, Kazuhisa
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Primary Examiner(s)Kuhns, Allan R.
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Application NumberUS09/597,296Time in Patent Office700 DaysField of Search264/49, 264/344US Class Current264/49CPC Class CodesB29C 67/202 comprising elimination of a...
