Disclosed are polymers suitable for hydrophilically modifying the surface of porous fluoropolymer supports, for example, a copolymer of the formula: Also disclosed are a method of preparing the polymers, a method of hydrophilically modifying porous fluoropolymer supports, hydrophilic fluoropolymer porous membranes prepared from the polymers, and a method of filtering fluids through the porous membranes.

Hydrophilically modified fluorinated membrane

Disclosed are self-assembling diblock copolymers of the formula (I): wherein R1-R4, n, and m are as described herein, which find use in preparing self-assembled structures and porous membranes. Embodiments of the self-assembled structures contain the diblock copolymer in a cylindrical morphology. Also disclosed is a method of preparing such copolymers.

Self-assembling polymers

Disclosed are membranes formed from self-assembling block copolymers, for example, diblock copolymers of the formula (I):
 
wherein R 1 -R 4 , n, and m are as described herein, which find use in preparing nanoporous membranes. Embodiments of the membranes contain a block copolymer that self-assembles into a cylindrical moiphology. Also disclosed is a method of preparing such membrane which involves spin coating a polymer solution containing the block copolymer to obtain a thin film, followed by annealing the thin film in a solvent vapor and/or soaking in a solvent or mixture of solvents to form a nanoporous membrane.

Membrane comprising self-assembled block copolymer and process for producing the same by hybrid casting (IIb)

Disclosed are self-assembled structures formed from self-assembling diblock copolymers of the formula (I):

Self-assembled structure and membrane comprising block copolymer and process for producing the same by spin coating (iiia)

PROBLEM TO BE SOLVED: To provide a porous film with reduced emission of outgas, free from the emission of a corrosive gas in combustion, and to provide a method for simply producing the porous film. SOLUTION: The porous film is composed of the resin composition comprising a hydrogenated norbornene-based ring-opened polymer with 110-145°C of melting point, which is obtained by ring-opening polymerization of 2-norbornene or a monomer mixture of the 2-norbornene and a norbornene based monomer having a substituent, and hydrogenating at least 80% of the carbon-carbon double bond of the polymer, and the ratio of the repeating unit (A) originating from 2-norbornene in the total repeating unit is 90-100 wt.% and the ratio of the repeating unit (B) of the norbornene based substituted monomer unit is 0-10 wt.%, and the invention also relates to the method for producing the porous film. COPYRIGHT: (C)2008,JPO&INPIT

Porous film and method for producing the same

Microporous membranes excellent in chemical resistance, particularly suitable for microfiltration, and easy of disposal; and a process for the production thereof. Specifically, microporous membranes characterized by being made from a polymer prepared by the ring-opening polymerization of a compound of the chemical formula (I) and by having a bubble point of 10 to 1000 kPa as determined using ethanol (according to the testing method stipulated in JIS K 3832), the polymer including the open-ring polymers and copolymers represented by the chemical formula (II), for example, norbornene resins. A process for the production of a microporous membrane, characterized by casting a solution prepared by dissolving under heating an open-ring polymer of a compound of the chemical formula (I) in a solvent (a) in which the polymer is soluble to form a film, rapidly cooling this film, and extracting the solvent (a) from the resulting film with a cleaning solvent (b) in which the polymer is insoluble to thereby obtain a microporous membrane having a bubble point of 10 to 1000 kPa as determined using ethanol (according to the testing method stipulated in JIS K 3832).

Yukio Fuji Photo Film Co. Ltd. Shinagawa

Papers

Microporous membranes and process for the production thereof