摘要:
The present invention relates to a surface-treated plastic article including a thin layer composed of a polymer complex on the surface. The surface-treated plastic article can be produced by a treatment with at least one kind of aqueous solutions of polymers having a weight average molecular weight of 200 or more. According to the present invention, the plastic articles, such as contact lenses, having superior transparency, wettability, oxygen permeability, and mechanical properties can be provided.
摘要:
The present invention relates to a surface-treated plastic article including a thin layer composed of a polymer complex on the surface. The surface-treated plastic article can be produced by a treatment with at least one kind of aqueous solutions of polymers having a weight average molecular weight of 200 or more. According to the present invention, the plastic articles, such as contact lenses, having superior transparency, wettability, oxygen permeability, and mechanical properties can be provided.
摘要:
A membrane treating agent for rejuvenating and improving a rejection performance of a semipermeable membrane, which contains an effective amount of a modified vinyl polymer having acetoxy groups and at least one group represented by the Formula (I) and/or (II): ##STR1## wherein R is a radical selected from the group consisting of aliphatic, aromatic and heterocyclic radicals having from 1 to 9 carbon atoms, and n is an integer from 1 to 3.Valuable modified vinyl polymers are obtained by reacting a partially saponified vinyl polymer with at least one carboxylic acid such as maleic acid, phthalic acid, succinic acid, butane tetracarboxylic acid and/or acid anhydrides or acid chlorides thereof.
摘要:
An oxygen scavenger comprises an oxygen absorbent composition and an oxygen permeable film covering the oxygen absorbent composition and including an asymmetric porous membrane whose outer surface portion in the thickness direction of the asymmetric porous membrane is formed as a dense skin layer. Since the dense skin layer is very thin, the oxygen permeability to the oxygen absorbent composition through the oxygen permeable film can be maintained sufficiently high. At the same time, since the dense skin layer has a sufficiently high barrier property as well as a high oxygen permeability, contact of the substances stored in a container with the oxygen absorbent composition can be surely prevented. The substances stored in the container attached with the oxygen scavenger can be prevented from deterioration due to the oxygen present in the container by a high oxygen absorption ability of the scavenger, and maintained in a good or fresh condition for a long term.
摘要:
A high performance semipermeable composite membrane containing a microporous substrate having a semipermeable membrane on the surface thereof. A composite ultrathin solute rejection barrier is formed on an intermediate transport layer which in turn is formed on a substrate.A mixture of a water soluble organic polymer having reactive amino groups in terminal and/or side chains, together with a monomer or monomeric polyamine is reacted with an agent having a polyfunctional group.
摘要:
A process of producing a composite semipermeable membrane which includes applying a polyfunctional amine solution and a polyfunctional acid halide solution in a hydrocarbon-based solvent having a flash point of not lower than 10.degree. C. on a surface of a microporous substrate to allow interfacial polycondensation reaction so as to form a cross-linked polyamide-based ultra-thin membrane superposed on the microporous substrate, then blowing a gas on the surface of the ultra-thin membrane so as to evaporate the hydrocarbon-based solvent, which gas has a velocity at the surface of 2-20 m/sec., a temperature of 10.degree.-80.degree. C. that is lower than the flash point of the hydrocarbon-based solvent, and an absolute humidity of not less than 1 g of water per 1 kg of dry gas.
摘要:
Alkyldiamine, 1,3,5-trihydroxybenzene or 1,3-dihydroxybenzene is added as a copolymerization component to a polyfunctional aromatic amine component in the amount of 1-20% by weight with respect to the polyfunctional aromatic amine in producing a composite semipermeable membrane by laminating on a microporous substrate a polyamide formed by interfacial polycondensation between a polyfunctional aromatic amine and a polyfunctional acid halide. The composite semipermeable membrane has improved oxidation resistance while retaining excellent separation selectivity and high permeability of the crosslinked polyamide-based composite semipermeable membrane. The composite semipermeable membrane is used for desalination of brackish and sea water.
摘要:
A process for preparing a semipermeable composite membrane comprising a microporous substrate and an ultra-thin membrane covering the substrate, wherein the ultra-thin membrane comprises a crosslinked piperazine polyamide as a main component and contains a constituent component represented by the following general formula (I): ##STR1## wherein R stands for --H or --CH.sub.3 and n is an integer of from 0 to 3.
摘要:
A composite membrane excelling in organic solvent resistance, heat resistance and organic vapor resistance is disclosed. The composite membrane of the present invention comprises a porous membrane including as a major constituent a polymer having a repeating unit represented by the formula (I)--Ph--S--Ph--SO.sub.2).sub.n (I)(wherein Ph represents phenyl group, n represents a natural number) and an active layer formed on said porous membrane. The composite membrane of the present invention may be used as a composite membrane for pervaporation, gas separation membrane and as a reverse osmosis membrane.