Abstract: A polyphenylene ether having a predetermined structure.

Abstract: The present disclosure provides a polyphenylene ether composition having a high glass transition temperature and a long-term solubility in a solvent, and exhibiting a low viscosity when being dissolved in a solvent. The polyphenylene ether composition of the present disclosure contains 60 mol % or more of a polyphenylene ether having the structure of Formula (1), wherein the ratio of the integrated value of the peak appearing at 7.6 to 8.3 ppm to the integrated value of the peak derived from the structure of the following Formula (2) in a 1H-NMR measurement result is 1 or less, and the number average molecular weight in terms of polystyrene is 500 to 15,000 g/mol.

Abstract: A polyphenylene ether having a predetermined structure.

Abstract: The description of the present application describes a cured product that is obtained by compression molding a resin composition that contains a polyphenylene ether (A) and a cross-linking curable compound (B). A phase separated structure that comprises a dispersed phase and a continuous phase is observed in a 10,000× morphological image that is observed from the vertical direction of a compression surface of the cured product using a transmission electron microscope. In a 200,000× morphological image that is observed from the vertical direction of the compression surface of the cured product using a transmission electron microscope, the continuous phase has a co-continuous structure that includes an A phase that has the polyphenylene ether (A) as a principal component and a B phase that has the cross-linking curable compound (B) as a principal component, the proportion of the area of the co-continuous structure occupied by the A phase being 40%-90% of the area.

Abstract: Provided is a prepreg suffering little resin particle fall-off and little resin peeling during prepreg production and during handling in order to have excellent dielectric properties for PPE and favorable adhesiveness. A PPE-containing prepreg constituted of a base material and a curable resin composition including PPE particles, wherein the prepreg is characterized in that (1) PPE extracted from the prepreg using a mixed solvent of toluene and methanol in a mass ratio of 95:5 includes PPE particles (A) insoluble in the mixed solvent, (2) the amount of PPE contained in the PPE particles (A) is 70 mass % or higher, and (3) the number-average molecular weight of the PPE contained in the PPE particles (A) is 8,000-40,000.

Abstract: The description of the present application describes a cured product that is obtained by compression molding a resin composition that contains a polyphenylene ether (A) and a cross-linking curable compound (B). A phase separated structure that comprises a dispersed phase and a continuous phase is observed in a 10,000× morphological image that is observed from the vertical direction of a compression surface of the cured product using a transmission electron microscope. In a 200,000× morphological image that is observed from the vertical direction of the compression surface of the cured product using a transmission electron microscope, the continuous phase has a co-continuous structure that includes an A phase that has the polyphenylene ether (A) as a principal component and a B phase that has the cross-linking curable compound (B) as a principal component, the proportion of the area of the co-continuous structure occupied by the A phase being 40%-90% of the area.

Abstract: Provided is a prepreg suffering little resin particle fall-off and little resin peeling during prepreg production and during handling in order to have excellent dielectric properties for PPE and favorable adhesiveness. A PPE-containing prepreg constituted of a base material and a curable resin composition including PPE particles, wherein the prepreg is characterized in that (1) PPE extracted from the prepreg using a mixed solvent of toluene and methanol in a mass ratio of 95:5 includes PPE particles (A) insoluble in the mixed solvent, (2) the amount of PPE contained in the PPE particles (A) is 70 mass % or higher, and (3) the number-average molecular weight of the PPE contained in the PPE particles (A) is 8,000-40,000.

Abstract: Provided is a prepreg suffering little resin particle fall-off and little resin peeling during prepreg production and during handling in order to have excellent dielectric properties for PPE and favorable adhesiveness. A PPE-containing prepreg constituted of a base material and a curable resin composition including PPE particles, wherein the prepreg is characterized in that (1) PPE extracted from the prepreg using a mixed solvent of toluene and methanol in a mass ratio of 95:5 includes PPE particles (A) insoluble in the mixed solvent, (2) the amount of PPE contained in the PPE particles (A) is 70 mass % or higher, and (3) the number-average molecular weight of the PPE contained in the PPE particles (A) is 8,000-40,000.

Abstract: Provided is a prepreg suffering little resin particle fall-off and little resin peeling during prepreg production and during handling in order to have excellent dielectric properties for PPE and favorable adhesiveness. A PPE-containing prepreg constituted of a base material and a curable resin composition including PPE particles, wherein the prepreg is characterized in that (1) PPE extracted from the prepreg using a mixed solvent of toluene and methanol in a mass ratio of 95:5 includes PPE particles (A) insoluble in the mixed solvent, (2) the amount of PPE contained in the PPE particles (A) is 70 mass % or higher, and (3) the number-average molecular weight of the PPE contained in the PPE particles (A) is 8,000-40,000.