Abstract: A porous liquid crystal polymer sheet and a wiring circuit board have excellent handleability and excellent low repulsive properties. The porous liquid crystal polymer sheet 1 has a porosity P of 20% or more and 90% or less. The porous liquid crystal polymer sheet 1 has a thickness T of 1 ?m or more and 240 ?m or less.

Abstract: A porous liquid crystal polymer sheet and a wiring circuit board have excellent handleability and excellent low repulsive properties. The porous liquid crystal polymer sheet 1 has a porosity P of 20% or more and 90% or less. The porous liquid crystal polymer sheet 1 has a thickness T of 1 ?m or more and 240 ?m or less.

Abstract: A resin foam has a thickness recovery rate (23° C., one minute, 50% compression) of 70% or more and a strain recovery rate (80° C., 24 hours, 50% compression) of 80% or more. The thickness recovery rate is determined by compressing the resin foam, holding the resin foam in the compressed state, decompressing the resin foam, measuring a thickness of the resin foam one second after the decompression, and calculating a percentage of the measured thickness with respect to the initial thickness as the thickness recovery rate. The strain recovery rate is determined by compressing the resin foam, holding the resin foam in the compressed state, returning the resin foam to 23° C. while maintaining the compressed state, decompressing the resin foam, and determining a percentage of a recovered distance with respect to a compressed distance as the strain recovery rate.

Abstract: Provided is a resin foam that is satisfactorily flexible and highly resistant to heat, exhibits superior strain recoverability at high temperatures, and has a high instantaneous recovery rate. This resin foam is formed from a resin composition containing an acrylic polymer, an active-energy-ray-curable compound having two (meth)acryloyl groups per molecule, an active-energy-ray-curable compound having three or more (meth)acryloyl groups per molecule, and a thermal crosslinking agent. The active-energy-ray-curable compound having two (meth)acryloyl groups per molecule and the active-energy-ray-curable compound having three or more (meth)acryloyl groups per molecule are preferably contained in a total content of from 20 to 150 parts by weight per 100 parts by weight of the acrylic polymer.

Abstract: Provided is a resin foam which has satisfactory strain recovery, is particularly resistant to shrinkage of its cell structure caused by the resinous restitutive force at high temperatures, and exhibits superior high-temperature strain recovery. The resin foam according to the present invention is obtained from a resin composition including an elastomer and an active-energy-ray-curable compound. The resin composition gives an unfoamed measurement sample having a glass transition temperature of 30° C. or lower and a storage elastic modulus (E?) at 20° C. of 1.0×107 Pa or more, each determined by a dynamic viscoelastic measurement.

Abstract: The present invention provides a process for producing a thermoplastic resin foam excellent in strength, flexibility, cushioning properties, strain recovery, and appearance, and exhibiting little shrinkage of the cell structure under a high temperature condition and a high expansion ratio. The process includes a foamed structure formation step of foam molding a thermoplastic resin composition containing a thermoplastic elastomer and an active energy-ray curable compound to thereby obtain a foamed structure; a foamed structure conveyance step of continuously conveying the foamed structure by a carrier sheet having a surface roughness (Ra) of 1 ?m or larger and a tensile break strength of 30 N/15 mm or higher, after the foamed structure formation step; and an active energy-ray irradiation step of irradiating the foamed structure with an active energy ray to thereby form a crosslinked structure by the active energy-ray curable compound in the foamed structure.

Abstract: There is provided a thermoplastic resin foam being excellent in strength, flexibility, cushioning properties, strain recovery and the like, particularly being low in the shrinkage of the cell structure due to the resilience of the resin, and being good in productivity. There is also provided a process for producing a thermoplastic resin foam which can produce, with good productivity, the thermoplastic resin foam being excellent in strength, flexibility, cushioning properties, strain recovery and the like, particularly being low in the shrinkage of the cell structure due to the resilience of the resin. The thermoplastic resin foam according to the present invention is obtained from a thermoplastic resin composition containing a thermoplastic elastomer, an active energy-ray curable compound and a radical trapping agent.