Abstract:
An object of the present invention is to provide a composite semipermeable membrane which has practical water permeability and removing properties and has a high boron removal ratio even after contact with chlorine. A composite semipermeable membrane of the present invention is a composite semipermeable membrane including a substrate, a porous supporting layer and a separation functional layer, which are superposed in this order, in which the separation functional layer includes a crosslinked fully aromatic polyamide, and the crosslinked fully aromatic polyamide has a molar ratio (amide group content) between a total molar proportion of a polyfunctional amine and a polyfunctional aromatic halide and a molar proportion of an amide group of 0.86-1.20.
Abstract:
Provided are a separation membrane and a separation membrane element, whereby separation and removal performance when the separation membrane element is operated under high pressure can be stabilized. The separation membrane includes: a separation membrane main body having at least a base material and a separating functional layer; and a flow path material independently fixed at an adhesion force of at least 1N/m to the opposite side to the separating functional layer, in the base material thickness direction.
Abstract:
This separation membrane is provided with: a separation membrane main body which has at least a base and a separating function layer; and a flow channel member which has a composition different from that of the separation membrane main body and is affixed to the base-side surface of the separation membrane main body. The flow channel member is arranged such that the flow channel member is discontinuous in a first direction but is continuous in a second direction from one end to the other end of the separation membrane main body.
Abstract:
A polyester resin composition having an equivalent spherical diameter of 1 mm to 50 mm, a degree of crystallization of not less than 65% and less than 99%, an intrinsic viscosity of not more than 0.7 dl/g and a cyclic trimer content of not more than 0.4% by weight. This polymer resin composition has an excellent color tone, causes no significant viscosity lowering or viscosity rise, and can withstand a process which is exposed to a long-term thermal history. A polyester resin composition having a viscosity suitable for extrusion in a general-purpose manner, a production process thereof, and a polyester film are also provided.
Abstract:
Disclosed is a polylactic acid resin multilayer sheet comprising a layer A and a layer B respectively composed of a polylactic acid resin composition. The layer A and the layer B respectively contain a specific amount of a poly(meth)acrylate. This polylactic acid resin multilayer sheet is excellent in transparency and heat resistance, and enables to obtain a molded body having a high plant matter content.
Abstract:
An object of the present invention is to provide a porous hollow-fiber membrane having high strength while maintaining high pure-water permeation performance. A porous hollow-fiber membrane of the present invention is a porous hollow-fiber membrane including a fluororesin-based polymer, in which the porous hollow-fiber membrane has a columnar texture oriented in a longitudinal direction of the porous hollow-fiber membrane, and a molecular chain of the fluororesin-based polymer is oriented in the longitudinal direction of the porous hollow-fiber membrane.
Abstract:
This separation membrane element has a water collection tube and a separation membrane leaf of which a plurality of sheets are stacked and wound around the periphery of the water collection tube. The separation membrane leaf is provided with a sheet that is configured by causing separation membranes, which are provided with a supply-side surface and a permeation-side surface, to be such that the supply-side surfaces face each other, a protrusion being adhered between the permeation-side surfaces of overlapping separation membrane leaves. Of the protrusion, the maximum height and minimum height have a ratio that is 1.10 to 1.50 inclusive, the variation coefficient is 0.02 to 0.15 inclusive, and the degree of impregnation of the protrusion in the sheet is 10-100% inclusive.
Abstract:
The present invention provides a separation membrane and a separation membrane element which are capable of exhibiting good water production performance and excellent in handleability and process passage. A separation membrane of the present invention is a separation membrane including: a separation membrane main body having a feed-side face and a permeate-side face; and a permeate-side channel member adhered to the permeate-side face of the separation membrane main body, in which the permeate-side channel member includes a composition containing at least a high-crystalline polypropylene (A) and satisfies the following requirements (a) and (b): (a) a content of the high-crystalline polypropylene (A) in the composition is from 40 to 95% by weight; and (b) the permeate-side channel member has a melting endothermic energy amount (”H) of from 20 to 70 J/g.
Abstract:
To provide a composite semipermeable membrane capable of maintaining high removal performance even after its supporting membrane has come into contact with an aqueous solution high in salt concentration. A composite semipermeable membrane including: a supporting membrane which includes a substrate and a porous supporting layer; and a separation functional layer provided on the porous supporting layer, in which a strength to peel the porous supporting layer away from the substrate is 1.1 N/25mm or higher.