Highly durable porous PVDF film, method of producing the same and washing method and filtration method using the same
First Claim
1. A porous film comprising a polymer component having a polyvinylidene fluoride (PVDF), resin as a main component thereof,wherein the degree of crystallization of the PVDF resin in the film is 50% or more but not more than 90%, andthe product of the degree of crystallization of the PVDF resin in the film and a specific surface area of the film is 300 (%·
- m2/g) or more but not more than 2000 (%·
m2/g).
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Abstract
The present invention provides a PVDF porous film and method for producing it, which has high water permeability and high chemical resistance to washing chemicals and the like that has been difficult to realize with conventional polymer porous films, and which can be used over a prolonged period of time, and a method of producing the same and the like. Namely, the present invention provides a porous film in which the degree of crystallization of the PVDF resin is 50% or more but not more than 90%, and the product of the degree of crystallization of the PVDF resin and the specific surface area of the film is 300 (%·m2/g) or more but not more than 2000 (%·m2/g).
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Citations
14 Claims
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1. A porous film comprising a polymer component having a polyvinylidene fluoride (PVDF), resin as a main component thereof,
wherein the degree of crystallization of the PVDF resin in the film is 50% or more but not more than 90%, and the product of the degree of crystallization of the PVDF resin in the film and a specific surface area of the film is 300 (%· - m2/g) or more but not more than 2000 (%·
m2/g). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- m2/g) or more but not more than 2000 (%·
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9. A method for producing a porous film comprising:
- producing a porous film having a polyvinylidene fluoride (PVDF) resin as a main component thereof by extruding, from a molding nozzle, a film-forming solution which at least comprises a hydrophobic polymer component having a PVDF resin as a main component thereof, a hydrophilic polymer component and a common solvent for both the hydrophobic and hydrophilic polymer components, and solidifying the film-forming solution in a solution having water as a main component thereof, wherein polyethylene glycol having a weight average molecular eight of 20,000 or more but not more than 150,000 is used as the hydrophilic polymer component,
wherein the degree of crystallization of the PVDF resin in the film is 50% or more but not more than 90% and the product of the degree of crystallization of the PVDF resin in the film and a specific surface area of the film is 300 (%·
m2/g) or more but not more than 2000 (%·
m2/g). - View Dependent Claims (10, 11, 12, 13, 14)
- producing a porous film having a polyvinylidene fluoride (PVDF) resin as a main component thereof by extruding, from a molding nozzle, a film-forming solution which at least comprises a hydrophobic polymer component having a PVDF resin as a main component thereof, a hydrophilic polymer component and a common solvent for both the hydrophobic and hydrophilic polymer components, and solidifying the film-forming solution in a solution having water as a main component thereof, wherein polyethylene glycol having a weight average molecular eight of 20,000 or more but not more than 150,000 is used as the hydrophilic polymer component,
Specification