Abstract:
The present invention describes hybrid gel materials with interpenetrating polyisocyanate and inorganic polymer networks. In the preferred embodiments, the polyisocyanate network comprises polyurea, polyurethane or both while the inorgan network comprises silica.
Abstract:
A method for the manufacture of a solid porous separation material based on a polysaccharide, said method comprising the steps of: (a) providing an aqueous solution (I) of a polysaccharide, (b) solidifying the solution, preferably by transforming the solution to a gel, and (c) optionally cross-linking the polysaccharide, with the proviso that, if step (c) is present, steps (b) and (c) may be carried out simultaneously.The method is characterised in that the polysaccharide provided in step (a) is modified by being inter-molecularly cross-linked to an extent such that the viscosity of solution (I) is at least 110%, preferably at least 200%, of the viscosity of an aqueous solution (II) of the corresponding polysaccharide which has not been inter-molecularly cross-linked and which is present in the same concentration as the inter-molecularly cross-linked polysaccharide is in solution (I).
Abstract:
A synthesis method for making an isocyanate based organic xerogel having a low density (i.e. 3 ) and a small pore size ( 100m 2 /g is disclosed. The synthesis method avoiding or reducing gel shrinkage during the solvent removal step is characterized by the step wherein the organic solvent used to synthesize the isocyanate based organic xerogel is replaced by water such that during the solvent removal step only water needs to be removed to dry the porous network and to obtain the isocyanate based organic xerogel.
Abstract:
This disclosure relates to a method for preparing a polyurethane mounting pad comprising the steps of: wet-solidifying a resin composition comprising polyurethane resin and a DMF solvent; and immersing the wet-solidified product in an aqueous solution comprising an acid catalyst or a base catalyst. According to the present invention, long and large pores may be uniformly formed inside of the prepared pad, thus affording low hardness, excellent compressibility, and the like, and more uniform thickness, pressure distribution or tension distribution and the like may be exhibited over the whole area of the pad, thus providing a polyurethane mounting pad that can realize more uniform and high efficiency polishing.
Abstract:
The present invention pertains to a resin composition which includes component (A): a membrane-forming polymer, component (B): a polymer obtained by polymerizing a monomer composition which includes a (meth)acrylic ester macromonomer (b1) represented by general formula (1) and another monomer (b2), and component (C): a polymer including a vinylpyrrolidone unit, a membrane-forming stock solution which includes the resin composition, a porous membrane obtained by forming with the membrane-forming stock solution, and a hollow fiber membrane, a water treatment device, an electrolyte support, and a separator which use the porous membrane. According to the present invention, it is possible to provide a porous membrane which has pores with high uniformity wherein the formation of large pores with a diameter of 1 µm or higher is suppressed and which has excellent fractionation performance and high water permeability, and a hollow fiber membrane, water treatment device, electrolyte support, and separator which use the porous membrane.
Abstract:
This disclosure relates to a polymer resin composition for preparing a microfilter membrane or an ultrafilter membrane, a method for preparing a polymer filter membrane using the polymer resin composition, and a polymer filter membrane prepared by the method. The polymer resin composition according to the present invention can provide a microporous membrane that includes more uniformly distributed micropores and exhibits high water permeability.