Patent
Microporous membranes and process for the production thereof
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TLDR
In this article, 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 from the resulting film with a cleaning solvent (b) in order to obtain a polymeric membrane having a bubble point of 10 to 1000 kPa as determined using ethanol (according to the testing method stipulated in JIS K 3832).Abstract:
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).read more
Citations
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TL;DR: In this article, a method of preparing a self-assembling block copolymer is described, which involves spin coating a polymer solution containing the blockcopolymer to obtain a thin film, followed by annealing the thin film in a solvent vapor and/or soaking in a mixture of solvents to form a nanoporous membrane.
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TL;DR: In this paper, a ring-opening polymerization of 2-norbornene or a monomer mixture of the 2-Norbornene and a norbornene based monomer having a substituent was proposed.
References
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Process for making polymers containing a norbornene repeating unit by addition polymerization using an organo (nickel or palladium) complex
TL;DR: In this paper, a single component ionic catalyst consisting essentially of an organonickel complex cation, and a weakly coordinating neutral counteranion is used to generate polymerization without measurable unsaturation.
Patent
Membrane for separation
TL;DR: In this paper, a ring-opening copolymerization of norbornene derivatives and cycloolefines was proposed to obtain the membrane for separation which can separate easily unsaturated compounds from the mixed solution of organic compounds.
Patent
A semipermeable membrane
TL;DR: A semipermeable membrane for reverse osmosis operations such as desalting of salt water and treatment of waste water was proposed in this paper, which is useful for both desalination and wastewater treatment.
Patent
Norbornene-based polymer and its production
TL;DR: In this paper, the subject polymer is obtained by addition polymerization, in the presence of a palladium catalyst, of a specific norbornene-based compound of formula I.