Abstract: A resin composition according to an embodiment is a resin composition being a precursor of an acoustic matching layer for an ultrasound transducer element included in an ultrasound transducer element unit having an array transducer element including a piezoelectric body and an electrode. The resin composition includes resin and inorganic material particles, while satisfying 2.3?Z/???3.4 where Z denotes an acoustic impedance of the acoustic matching layer, whereas ? denotes the density of the inorganic material particles.

Abstract: A resin molded article including an ethylene vinyl acetate copolymer resin and carbon black as primary components. After the resin molded article is heated from 25 degrees Celsius to 100 degrees Celsius and then cooled to 25 degrees Celsius, the shrinkage factor of the resin molded article at 25 degrees Celsius cooled after heated to 100 degrees Celsius relative to the resin molded article at 25 degrees Celsius before heated is less than or equal to 2.0%.

Abstract: A resin molded article including an ethylene vinyl acetate copolymer resin and carbon black as primary components. After the resin molded article is heated from 25 degrees Celsius to 100 degrees Celsius and then cooled to 25 degrees Celsius, the shrinkage factor of the resin molded article at 25 degrees Celsius cooled after heated to 100 degrees Celsius relative to the resin molded article at 25 degrees Celsius before heated is less than or equal to 2.0%.

Abstract: The planar heat-generating element includes: a base material; a heat-generating layer formed on the base material, the heat-generating layer having conductivity; a pair of electrodes arranged to be brought into contact with the heat-generating layer; and a protective layer, wherein the pair of electrodes are arranged so as to be opposed to each other in a direction parallel to a first direction, wherein the heat-generating layer has a plurality of holes in a region between the pair of electrodes, wherein, when widths of two holes out of the plurality of holes in a second direction orthogonal to the first direction, the two holes being present adjacent to each other on one and the same straight line parallel to the second direction and an interval between the two holes in a direction parallel to the second direction satisfy a specific relationship.

Abstract: A resin composition containing a resin, a magnetic powder, a first non-magnetic powder with a water-soluble content in the range of 0.1% to 0.5%, and a second non-magnetic powder with a water-soluble content of 0.05% or less.

Abstract: A resin composition containing a resin, a magnetic powder, a first non-magnetic powder with a water-soluble content in the range of 0.1% to 0.5%, and a second non-magnetic powder with a water-soluble content of 0.05% or less.

Abstract: A resin molded body contains a resin, a magnetic powder, and a non-magnetic powder. The non-magnetic powder has an apparent density in the range of 0.70 to 1.0 g/cm3. The non-magnetic powder content is more than 8% by volume and 40% or less by volume.

Abstract: A resin molded article including an ethylene vinyl acetate copolymer resin and carbon black as primary components. After the resin molded article is heated from 25 degrees Celsius to 100 degrees Celsius and then cooled to 25 degrees Celsius, the shrinkage factor of the resin molded article at 25 degrees Celsius cooled after heated to 100 degrees Celsius relative to the resin molded article at 25 degrees Celsius before heated is less than or equal to 2.0%.

Abstract: A resin molded article including an ethylene vinyl acetate copolymer resin and carbon black as primary components. After the resin molded article is heated from 25 degrees Celsius to 100 degrees Celsius and then cooled to 25 degrees Celsius, the shrinkage factor of the resin molded article at 25 degrees Celsius cooled after heated to 100 degrees Celsius relative to the resin molded article at 25 degrees Celsius before heated is less than or equal to 2.0%.

Abstract: A resin molded article including an ethylene vinyl acetate copolymer resin and carbon black as primary components. After the resin molded article is heated from 25 degrees Celsius to 100 degrees Celsius and then cooled to 25 degrees Celsius, the shrinkage factor of the resin molded article at 25 degrees Celsius cooled after heated to 100 degrees Celsius relative to the resin molded article at 25 degrees Celsius before heated is less than or equal to 2.0%.