Processes for making a fluid conduits and fluid conduits made thereby are disclosed. The fluid conduits include a mono-layer formed of at least 80 wt %, based on total weight of the mono-layer, of a thermoplastic elastomer in an amount of at least 80 wt % with respect to the total weight of the mono-layer. The thermoplastic elastomer is preferably a block copolymer elastomer formed of hard segments (e.g., polyesters, polyamides and/or polyurethanes) and soft segments (e.g., aliphatic polyethers, aliphatic polyesters and/or aliphatic polycarbonates) and exhibits a melt flow rate measured at 230° C. under a load of 10 kg (MFR 230° C./10 kg), according to ISO1133 (2011) of at most 40 g/10 min and having a heat resistance of at least 250 hours at 175° C. at which the elongation at break remains at least 100% as measured according to ISO 527 with a test speed of 50 mm/min.

A multilayer tube includes: an inner layer including a polymer, wherein the polymer includes a fluoropolymer, a polyolefin, a blend thereof, or combination thereof; and an outer layer adjacent to the inner layer, wherein the outer layer includes a polymer including a fluoropolymer, a polyolefin, a blend thereof, or combination thereof; wherein the inner layer, the outer layer, or combination thereof includes at least one blocking agent, wherein the at least one blocking agent reduces the percent transmission by at least 99% at wavelengths between 240 nm to 450 nm.

A multilayer tube includes: an inner layer including a polymer, wherein the polymer includes a fluoropolymer, a polyolefin, a blend thereof, or combination thereof; and an outer layer adjacent to the inner layer, wherein the outer layer includes a polymer including a fluoropolymer, a polyolefin, a blend thereof, or combination thereof; wherein the inner layer, the outer layer, or combination thereof includes at least one blocking agent, wherein the at least one blocking agent reduces the percent transmission by at least 99% at wavelengths between 240 nm to 450 nm.

The present invention relates to a multilayer tubular structure (MLT) intended for the transport of fluids, in particular of petrol, especially alcohol-containing petrol, comprising, from the outside inwards, at least one barrier layer (1) and at least one inner layer (2) located below the barrier layer, said inner layer (2), or all the layers (2) and the other optional layers located below the barrier layer, containing on average from 0 to 1.5% by weight of plasticizer relative to the total weight of the composition of the layer (2) or to the total weight of all the compositions of the layers (2) and the other optional layers located below the barrier layer, respectively, said inner layer (2) predominantly comprising at least one polyamide of aliphatic type or consisting of more than 75% of aliphatic units, said aliphatic polyamide being chosen from: a polyamide denoted A, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.A, of from 4 to 8.5, advantageously from 4 to 7; a polyamide denoted B, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.B, of from 7 to 10, advantageously from 7.5 to 9.5; a polyamide denoted C, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.C, of from 9 to 18, advantageously from 10 to 18; with the proviso that when said inner layer (2) comprises at least three polyamides, at least one of said polyamides A, B and C is excluded.

The present invention relates to a multilayer tubular structure (MLT) intended for the transport of fluids, in particular of petrol, especially alcohol-containing petrol, comprising, from the outside inwards, at least one barrier layer (1) and at least one inner layer (2) located below the barrier layer, said inner layer (2), or all the layers (2) and the other optional layers located below the barrier layer, containing on average from 0 to 1.5% by weight of plasticizer relative to the total weight of the composition of the layer (2) or to the total weight of all the compositions of the layers (2) and the other optional layers located below the barrier layer, respectively, said inner layer (2) predominantly comprising at least one polyamide of aliphatic type or consisting of more than 75% of aliphatic units, said aliphatic polyamide being chosen from: a polyamide denoted A, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.A, of from 4 to 8.5, advantageously from 4 to 7; a polyamide denoted B, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.B, of from 7 to 10, advantageously from 7.5 to 9.5; a polyamide denoted C, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.C, of from 9 to 18, advantageously from 10 to 18; with the proviso that when said inner layer (2) comprises at least three polyamides, at least one of said polyamides A, B and C is excluded.

Provided is a thermoplastic resin composition for cooling medium transportation pipes, which has high barrier performance, is flexible and has good extrusion moldability. A thermoplastic resin composition which comprises a matrix that comprises a thermoplastic resin and a domain that comprises a rubber and is dispersed in the matrix, the thermoplastic resin composition being characterized by having an oxygen permeability coefficient (cm.sup.3.Math.mm/(m.sup.2.Math.day.Math.mmHg)) of 0.02 or less at 21° C. and at a humidity of 0%, and being also characterized in that the melt viscosity of the thermoplastic resin constituting the matrix is 300 Pa.Math.s or less at 250° C. and at a shear rate of 243.2 s.sup.−1, the thermoplastic resin comprises a thermoplastic resin having a melting point or a glass transition temperature of 150° C. or higher and a thermoplastic resin having an oxygen permeability coefficient of 0.004 or less or comprises a thermoplastic resin having a melting point or a glass transition temperature of 150° C. or higher and an oxygen permeability coefficient of 0.004 or less, and the rubber comprises an isobutylene-based block copolymer and an olefin- or styrene-based polymer having an epoxy group, an amino group, a hydroxyl group, an acid anhydride group or a carboxyl group.

A rubber composition having improved electrical insulation properties for reducing galvanic corrosion, a method of preparing the composition, and a rubber hose for vehicles using the composition are disclosed. The rubber composition includes a base polymer, a reinforcing agent, an anti-aging agent, an activating agent, a plasticizer, and a crosslinking agent, and has electrical insulation resistance (10.sup.7 Ω.Math.cm) of 50 or more.

This invention relates in general to a multilayer tube and methods of making the same. In particular, this invention relates to a multilayer tube used as a riser, such as those that may be connected to shutoff or “stop” valve on one end and a plumbing hook-up to the other end. The multilayer tube comprises a first inner polymer layer and a second outer polymer layer, wherein the first and second polymer layers are not substantially bonded to each other. To facilitate use, the tube may additionally comprise one or more overmolded components, such as pipe connectors, plumbing connections, plumbing fittings, valve connectors and appliance connectors. The layers are not substantially bonded.

This invention relates in general to a multilayer tube and methods of making the same. In particular, this invention relates to a multilayer tube used as a riser, such as those that may be connected to shutoff or “stop” valve on one end and a plumbing hook-up to the other end. The multilayer tube comprises a first inner polymer layer and a second outer polymer layer, wherein the first and second polymer layers are not substantially bonded to each other. To facilitate use, the tube may additionally comprise one or more overmolded components, such as pipe connectors, plumbing connections, plumbing fittings, valve connectors and appliance connectors. The layers are not substantially bonded.

Pipe body for an unbonded reinforced thermoplastic pipe (uRTP), the pipe body including a fluid retaining liner, an intermediate layer located radially outwardly of the fluid retaining liner, and a protective sheath located radially outwardly of the intermediate layer. The pipe body includes an end portion for terminating the pipe body at an end fitting. At the end portion, the intermediate layer is bonded to the fluid retaining liner. Away from the end portion, the intermediate layer remains unbonded to the fluid retaining liner.