A polymer optical fiber is provided which shows improved hydrolytic stability. This fiber comprises a polymeric optical core and cladding layer, surrounded by a polymeric overcladding layer which comprises a miscible blend of one or more hydrolytically stable amorphous polymers. By varying the ratios of the component polymers in the overcladding blend, the glass transition temperature and the coefficient of thermal expansion of the overcladding layer may be tuned to optimize the attenuation and bandwidth of the plastic optical fiber.

A polymer optical fiber is provided which shows improved hydrolytic stability. This fiber comprises a polymeric optical core and cladding layer, surrounded by a polymeric overcladding layer which comprises a miscible blend of one or more hydrolytically stable amorphous polymers. By varying the ratios of the component polymers in the overcladding blend, the glass transition temperature and the coefficient of thermal expansion of the overcladding layer may be tuned to optimize the attenuation and bandwidth of the plastic optical fiber.

An elastic film including a plurality of parallel elastic ribbons elongated in a longitudinal direction and spaced apart from each other in a transverse direction orthogonal to the longitudinal direction, wherein the elastic ribbons are coated on at least one surface by at least one skin layer which joins the plurality of parallel elastic ribbons to each other.

An elastic film including a plurality of parallel elastic ribbons elongated in a longitudinal direction and spaced apart from each other in a transverse direction orthogonal to the longitudinal direction, wherein the elastic ribbons are coated on at least one surface by at least one skin layer which joins the plurality of parallel elastic ribbons to each other.

A pipe having an inner layer and an outer layer. The inner layer includes a first material having a first hydrostatic design basis (HDB), and the outer layer is coextruded with the inner layer and includes a second material having a second HDB. The second HDB is greater than or equal to the first HDB, and the first HDB and the second HDB are as specified in ASTM Test Method D2387. Also provided re methods of making and using the pipe.

A pipe having an inner layer and an outer layer. The inner layer includes a first material having a first hydrostatic design basis (HDB), and the outer layer is coextruded with the inner layer and includes a second material having a second HDB. The second HDB is greater than or equal to the first HDB, and the first HDB and the second HDB are as specified in ASTM Test Method D2387. Also provided re methods of making and using the pipe.

A blowing head, a method for producing a blown film, and a blown film installation include the use of plate spiral distributors in blown film installations for distributing melt steams arriving from extruders and for combining the melt streams to form an annular gap stream in several layers in an annular gap leading to a tubular die. The melt streams in a plate spiral distributor are initially bundled and then forwarded in a bundled manner to a common co-extrusion flow. The distributer has a plurality of spirals in superimposed layers, and the spirals of two layers have a junction for pre-combining the melt streams of two layers, and in that starting from the junction, a common guide leading to the annular gap is provided for combining there the pre-combined melt streams with the annular gap stream.

A urinary catheter and a method of its manufacture are disclosed. The urinary catheter comprises a tubular shaft extending between an insertion end and a discharge end, the tubular shaft being formed of at least two materials having different properties. The materials are arranged substantially separated from each other in distinct zones, wherein at least one of the width and thickness of said zones varies over the length of the tubular shaft, to form two or more uniform sections of the tubular shaft having various relative amounts of said materials, and wherein at least one transition between two such uniform sections is formed by at least one transition section providing a gradual transition between the uniform sections. The catheter can e.g. be produced by intermittent extrusion.

Provided is a double-walled container (1), which includes an outer layer body (2) and an inner layer body (3). A single adhesive strip (4) is disposed between the outer layer body (2) and the inner layer body (3) in a manner such that the adhesive strip (4) extends along a center axis (C). The outer layer body (2) is provided with a single ambient air introduction hole (2d). The outer layer body (2) includes an inner surface, which is configured by a separation surface (2f) and a pseudo-adhesive surface (2g). The separation surface (2f) faces the ambient air introduction hole (2d) and is separated from an outer surface of the inner layer body (3), and the pseudo-adhesive surface (2g) faces the separation surface (2f) and is separably adhered to the outer surface of the inner layer body (3).

Provided are a multilayer film, a method for producing the multilayer film, and a method for producing a molded body. The multilayer film has excellent three-dimensional overlaying formability and adhesiveness after being formed; can easily be used when being bonded to an adherend; maintains adhesive strength. Specifically, the multilayer film has: an adhesive layer comprising a thermoplastic polymer composition containing a thermoplastic elastomer (A) which is a block copolymer or a hydrogenated product thereof having a polymer block (a1) containing aromatic vinyl compound units and having a polymer block (a2) containing conjugated diene compound units; and a base layer comprising an amorphous resin which has a modulus of elasticity of 2 to 600 MPa at an arbitrary temperature of 110 to 160° C. The tensile elongation at break of the multilayer film at a temperature 5° C. lower than the glass transition temperature of the amorphous resin is at least 160%.