US 2026/0078860 A1 · TUBULAR ASSEMBLY COMPRISING LOW DENSITY, LOW THERMAL CONDUCTIVITY LOW THERMAL EFFUSIVITY POLYARYLENE SULFIDE FOAM

Abstract

A polyarylene sulfide (PAS) foam layer that circumscribes a hollow inner tube and may have a 50% or greater density reduction relative to the density of an un-foamed PAS polymer material and/or a 50% or greater thermal conductivity reduction relative to the thermal conductivity of an un-foamed PAS polymer material and/or 50% or greater thermal effusivity reduction relative to the thermal effusivity of an un-foamed PAS polymer material. The PAS foam layer may have a low density (e.g., less than 0.67 g/cc) and/or a low thermal conductivity (e.g., anywhere from 0.017 W/(m-K) to 0.145 W/(m-K)) and/or a low thermal effusivity (e.g., less than 316 Ws1/2/m2/K, optionally anywhere from 38 Ws1/2/m2/K to 316 Ws1/2/m2/K) even at high temperatures (e.g., above 400 degrees Fahrenheit (° F.) (about 204 degrees Celsius (° C.)). Such a PAS foam layer may have characteristics appropriate for use as part of a steam hose.

Claims20

Dependent claims

A tubular assembly comprising:

a tubular first member having an outer surface and an inner surface, the inner surface defining an innermost surface of the assembly;
and
a tubular second member surrounding the outer surface of the first member, wherein the second member comprises a foamed polyphenylene sulfide polymer material having a foamed density and a foamed thermal effusivity that is foamed from a mixture of a foaming agent and an un-foamed polyphenylene sulfide polymer material having polymer chains that are branched or cross-linked, the polyphenylene sulfide having an un-foamed density and an un-foamed thermal effusivity,
wherein the foamed polyphenylene sulfide polymer material has an average cell diameter of at least 100 μm,
wherein the foamed density is less than about 50% of the un-foamed density;
wherein the foamed thermal effusivity is less than about 50% of the un-foamed thermal effusivity;
and
wherein the foamed polyphenylene sulfide polymer material is a closed-cell foam.

5 more elements

A tubular assembly comprising:

a tubular first member having an outer surface and an inner surface, the inner surface defining an innermost surface of the assembly;
and
a tubular second member surrounding the outer surface of the first member, wherein the second member comprises a foamed polyphenylene sulfide polymer material having a foamed density and a foamed thermal effusivity that is foamed from a mixture of a foaming agent and an un-foamed polyphenylene sulfide polymer material having polymer chains that are branched or cross-linked, the polyphenylene sulfide having an un-foamed density and an un-foamed thermal effusivity,
wherein the foamed polyphenylene sulfide polymer material has an average cell diameter of at least 100 μm,
wherein the foamed density is less than about 50% of the un-foamed density;
wherein the foamed thermal effusivity is less than about 50% of the un-foamed thermal effusivity;
and
wherein the foamed polyphenylene sulfide polymer material is a semi-closed-cell foam.

5 more elements

Dependencies are inferred from the claim text.

Tubular assembly comprising low density, low thermal conductivity low thermal effusivity polyarylene sulfide foam

Life of this patent

Tubular assembly comprising low density, low thermal conductivity low thermal effusivity polyarylene sulfide foam

Life of this patent

Abstract

Claims20