A polyolefin microporous membrane, a method for manufacturing the same, and a separator including the microporous membrane are provided. The polyolefin microporous membrane including 60 wt % to 80 wt % of a polypropylene having a viscosity average molecular weight of 110.sup.6 g/mol to 310.sup.6 g/mol and 20 wt % to 40 wt % of a polyethylene having a weight average molecular weight of 110.sup.5 g/mol to 1010.sup.5 g/mol is provided, wherein the polyolefin microporous membrane has a puncture strength of 0.25 N/m or more, a gas permeability of 1.010.sup.5 Darcy or more, a porosity of 30% to 70%, an average pore size of 20 nm to 40 nm, a shutdown temperature of 150 C. or lower, and a meltdown temperature of 180 C. or higher.

A biaxially-oriented polyethylene film comprising 25 to 60 wt. % of an ethylene-alpha-olefin copolymer including an ethylene monomer and a 1-octene or 1-hexene comonomer along with an amount of copolymer eluting in an elution profile via iCCD between 65.0 C. and 95.0 C. of at least 50% and a molecular weight in the elution profile between 65.0 C. and 95.0 C. greater than 90,000 g/mol: and from 40 to 75 wt. % of a filler is disclosed. The biaxially-oriented film has a water vapor transmission rate of greater than 300 g/m.sup.2/day at 40.0 and at a relative humidity of 60%, and an elongation at break of less than 200% in both the machine direction and the transverse direction. An article comprising this biaxially-oriented polyethylene film is also disclosed.

Ophthalmic devices and related methods are provided for management of water vapor transmissibility, delivery of pharmaceutical agents, and non-surgical corneal reshaping. In some embodiments, an ophthalmic device comprises an anterior surface facing away from an eye, a posterior surface facing toward the eye, a medium residing between the anterior surface and the posterior surface, wherein the medium has an oxygen permeability and a water vapor permeability, a first region having a first thickness of the medium, the first region having a water vapor transmissibility above a first minimum value and an oxygen transmissibility above a second minimum value, and a second region having a second thickness of the medium, the second region having a water vapor transmissibility below a third minimum value and an oxygen transmissibility above a fourth minimum value, wherein the second thickness is greater than the first thickness.

A method of forming a three-dimensional object, is carried out by (a) providing a carrier and a build plate, the build plate comprising a semipermeable member, the semipermeable member comprising a build surface with the build surface and the carrier defining a build region therebetween, and with the build surface in fluid communication by way of the semipermeable member with a source of polymerization inhibitor; (b) filling the build region with a polymerizable liquid, the polymerizable liquid contacting the build surface, (c) irradiating the build region through the build plate to produce a solid polymerized region in the build region, while forming or maintaining a liquid film release layer comprised of the polymerizable liquid formed between the solid polymerized region and the build surface, wherein the polymerization of which liquid film is inhibited by the polymerization inhibitor; and (d) advancing the carrier with the polymerized region adhered thereto away from the build surface on the build plate to create a subsequent build region between the polymerized region and the build surface while concurrently filling the subsequent build region with polymerizable liquid as in step (b). Apparatus for carrying out the method is also described.

The present disclosure relates to the technical field of silicone rubbers, and discloses a preparation method for an air-permeable and antibacterial silicone rubber material and an application thereof in home textiles. Activated silicone rubber and double quaternary ammonium salt-type benzoic acid are subjected to an esterification reaction under the catalysis of p-toluenesulfonic acid to obtain double quaternary ammonium salt-grafted silicone rubber. The double quaternary ammonium salt-grafted silicone rubber is blended with silicone rubber and then applied to home textiles, wherein the quaternary ammonium salt component can destroy cellular enzymes in bacteria and has an antibacterial effect, and the silicon-oxygen-silicon in the silicone rubber not only has excellent air permeability, but also has excellent mechanical properties. Finally, the home textile material with excellent antibacterial properties, air permeability and mechanical properties is obtained.

There is provided a polyurethane foam, wherein at least one of principal surfaces opposite to each other has a hole opening ratio of 0% to 1.0%, and the principal surface having the hole opening ratio has a root mean square surface roughness of 0.01 to 0.30 m in accordance with JIS B 0601:1994, and the polyurethane foam has an air permeability of 0 to 2.0 cm.sup.3/cm.sup.2/sec in accordance with JIS K 6400.

A thermoformable polymeric film includes a polymeric layer. The polymeric layer includes at least 50% polypropylene by weight, at least 5% tackifier by weight, and from 0.1% to 5% crosslinker by weight. The polypropylene comprises impact polypropylene. The layer comprises at least 5% impact polypropylene by weight.

A high-ageing-stable planar sheet for the building sector and to the use of a high-ageing-stable planar sheet in the building sector, in particular as a sarking sheet, underlay sheet and/or sheathing sheet in a roof construction and/or a faade sheet in a wall construction.

A method and system for perforating stretch film. The stretch film may be extruded using a cast film or blown film extrusion process. The stretch film may be passed over a first idler roller and moved in a first direction toward a perforation roller. The perforation roller may have a center axle and a plurality of perforation rings, each of which has an outer ring, a plurality of pins extending through the outer ring, and an inner ring configured to hold the plurality of pins in an extended position through the outer ring. The stretch film may be perforated with the perforation roller as the stretch film passes over the perforation roller. The perforated stretch film may be moved in a second direction away from the perforation roller, passed over a second idler roller, and wrapped about a core to form a roll of perforated stretch film.

A composite material for gas capture including CO.sub.2 capture and capture of other gases. The composite material includes solid or liquid reactive material, filler material, and a gas-permeable polymer coating such that the reactive material forms micron-scale domains in the filler material.