Abstract: A laminate with superior thermal conductivity, heat resistance, drill workability, and fire retardancy is provided. In a prepreg obtained by impregnating a woven or nonwoven fabric base with a thermosetting resin composition, the thermosetting resin composition contains 80 to 200 parts by volume of an inorganic filler per 100 parts by volume of a thermosetting resin, the inorganic filler contains (A) gibbsite type aluminum hydroxide particles having an average particle diameter (D50) of 2 to 15 ?m and (B) magnesium oxide having an average particle diameter (D50) of 0.5 to 15 ?m, and a compounding ratio (volume ratio) of the gibbsite type aluminum hydroxide particles (A) to the magnesium oxide (B) is 1:0.3 to 3.

Abstract: Disclosed is a prepreg obtained by impregnating a woven fabric base with a thermosetting resin composition, wherein the thermosetting resin composition contains 80 to 200 volume parts of an inorganic filler per 100 volume parts of a thermosetting resin, and the inorganic filler contains (A) gibbsite aluminum hydroxide particles having an average particle diameter (D50) of 2 to 15 ?m, (B) at least one inorganic component selected from the group consisting of boehmite particles having an average particle diameter (D50) of 2 to 15 ?m and inorganic particles that have an average particle diameter (D50) of 2 to 15 ?m and that contain crystal water having a release initiation temperature of 400° C. or higher or contain no crystal water, and (C) aluminum oxide particles having an average particle diameter (D50) of 1.

Abstract: A laminate with superior thermal conductivity, heat resistance, drill workability, and fire retardancy is provided. In a prepreg obtained by impregnating a woven or nonwoven fabric base with a thermosetting resin composition, the thermosetting resin composition contains 80 to 200 parts by volume of an inorganic filler per 100 parts by volume of a thermosetting resin, the inorganic filler contains (A) gibbsite type aluminum hydroxide particles having an average particle diameter (D50) of 2 to 15 ?m and (B) magnesium oxide having an average particle diameter (D50) of 0.5 to 15 ?m, and a compounding ratio (volume ratio) of the gibbsite type aluminum hydroxide particles (A) to the magnesium oxide (B) is 1:0.3 to 3.

Abstract: Disclosed is a prepreg obtained by impregnating a woven fabric base with a thermosetting resin composition, wherein the thermosetting resin composition contains 80 to 200 volume parts of an inorganic filler per 100 volume parts of a thermosetting resin, and the inorganic filler contains (A) gibbsite aluminum hydroxide particles having an average particle diameter (D50) of 2 to 15 ?m, (B) at least one inorganic component selected from the group consisting of boehmite particles having an average particle diameter (D50) of 2 to 15 ?m and inorganic particles that have an average particle diameter (D50) of 2 to 15 ?m and that contain crystal water having a release initiation temperature of 400° C. or higher or contain no crystal water, and (C) aluminum oxide particles having an average particle diameter (D50) of 1.

Abstract: A halogen-free flame retardant resin composition comprising a radically polymerizable resin which is modified with a phosphorus-containing compound of the formula (1): in which R is a hydrogen atom or a group of the formula: —(CH2)n—R1 in that R1 is a group derived from a compound having at least two phenolic hydroxyl groups or epoxy groups, and n is an integer of 0 to 3.

Abstract: A composite dielectric is formed with a matrix synthetic resin and particulate porous, inorganic dielectric dispersed in the matrix synthetic resin. The dielectric constant of this composite dielectric can be thereby elevated effectively without enlarging the dissipation factor (tan .delta.) of the composite dielectric.