Water-slidable/oil-slidable film, production method thereof, and articles having the surface coated therewith

Abstract

The problem to be solved by the present invention is to provide a water-slidable/oil-slidable film that is easily producible and has improved durability. A water-slidable/oil-slidable film of the present invention comprises: a porous polymer film having a three-dimensional entangled network structure of a fibrous polymer and a continuous pore structure as the empty space of the network structure, and a slippery liquid infused in the pores of the porous polymer film.

What is claimed is: 
     
         1 . A water-slidable/oil-slidable film comprising:
 a porous polymer film having a three-dimensional entangled network structure of a fibrous polymer and a continuous pore structure as the empty space of the network structure, and   a slippery liquid infused in the pores of the porous polymer film.   
     
     
         2 . The water-slidable/oil-slidable film of the  claim 1 , wherein an average pore diameter of the porous polymer film is 500 to 1000 nm. 
     
     
         3 . The water-slidable/oil-slidable film of the  claim 1 , wherein an average fiber diameter of the porous polymer film is 100 to 400 nm. 
     
     
         4 . The water-slidable/oil-slidable film of the  claim 1 , wherein root-mean-square roughness of the porous polymer film is 0.3 to 0.6 μm. 
     
     
         5 . The water-slidable/oil-slidable film of the  claim 1 , wherein the porous polymer film is made of a fluorine-based resin or silicone resin. 
     
     
         6 . The water-slidable/oil-slidable film of the  claim 5 , wherein the porous polymer film is made of polyvinylidene fluoride or copolymer thereof. 
     
     
         7 . The water-slidable/oil-slidable film of the  claim 1 , wherein the slippery liquid has affinity to the porous polymer film. 
     
     
         8 . The water-slidable/oil-slidable film of the  claim 1 , wherein the slippery liquid is a fluorine-based oil or silicone oil. 
     
     
         9 . The water-slidable/oil-slidable film of the  claim 8 , wherein the slippery liquid is perfluoropolyether. 
     
     
         10 . The water-slidable/oil-slidable film of the  claim 1 , wherein the refractive index difference between the porous polymer film and the slippery liquid is 0.3 or less. 
     
     
         11 . The water-slidable/oil-slidable film of the  claim 1 , wherein an average transmittance of the light with the wavelength of 400 to 700 nm is 80% or higher. 
     
     
         12 . A production method of water-slidable/oil-slidable film comprising:
 a step of mixing with stirring a polymer and a pore-forming agent that does not dissolve the polymer and a volatile organic solvent that can dissolve both the polymer and the pore-forming agent,   a step of forming a coating film by applying the mixture obtained in the preceding step on the surface of an article, and vaporizing the volatile organic solvent,   a step of forming a porous polymer film by contacting the coating film obtained in the preceding step with an organic solvent allowing that can dissolve the pore-forming agent without dissolving the polymer, to remove the pore-forming agent from the coating film,   a step of infusing a slippery liquid inside the pores of the porous polymer film obtained in the preceding step.   
     
     
         13 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein a mixing ratio (mass ratio) of the polymer to the pore-forming agent is 1:1.5 to 1:5. 
     
     
         14 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the polymer is a fluorine-based resin or silicone resin. 
     
     
         15 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the polymer is polyvinylidene fluoride or copolymers thereof. 
     
     
         16 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the polymer is soluble in acetone and insoluble in ethanol. 
     
     
         17 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the pore-forming agent is an ethanol-soluble low-molecular-weight solvent. 
     
     
         18 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the pore-forming agent is phthalic acid or derivatives thereof. 
     
     
         19 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the volatile organic solvent is an organic solvent with a boiling point of 100° C. or lower. 
     
     
         20 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the volatile organic solvent is acetone. 
     
     
         21 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the organic solvent that can dissolve the pore-forming agent without dissolving the polymer is ethanol. 
     
     
         22 . The production method of water-slidable/oil-slidable film of the  claim 12 , wherein the slippery liquid is a fluorine-based oil or silicone oil. 
     
     
         23 . The production method of water-slidable/oil-slidable film of the  claim 22 , wherein the slippery liquid is perfluoropolyether. 
     
     
         24 . An article having the surface coated with the water-slidable/oil-slidable film of the  claim 1 .