The present disclosure provides a phosphorus-containing compound represented by Formula (1), a resin composition comprising the phosphorus-containing compound, and an article made from the resin composition. The phosphorus-containing compound can achieve halogen-free flame retardancy while satisfying the requirements of excellent dielectricity, high copper foil peeling strength, high glass transition temperature, low percent thermal expansion and excellent heat resistance after moisture absorption. The resin composition comprises the following components or a prepolymer thereof: (A) 100 parts by weight of an unsaturated CC double bond-containing polyphenylene ether resin; and (B) 15 parts by weight to 90 parts by weight of the phosphorus-containing compound represented by Formula (1); wherein the prepolymer is obtained from a mixture through prepolymerization, and the mixture comprises at least the component (A) and the component (B). ##STR00001##

The present disclosure provides a phosphorus-containing compound represented by Formula (1), a resin composition comprising the phosphorus-containing compound, and an article made from the resin composition. The phosphorus-containing compound can achieve halogen-free flame retardancy while satisfying the requirements of excellent dielectricity, high copper foil peeling strength, high glass transition temperature, low percent thermal expansion and excellent heat resistance after moisture absorption. The resin composition comprises the following components or a prepolymer thereof: (A) 100 parts by weight of an unsaturated CC double bond-containing polyphenylene ether resin; and (B) 15 parts by weight to 90 parts by weight of the phosphorus-containing compound represented by Formula (1); wherein the prepolymer is obtained from a mixture through prepolymerization, and the mixture comprises at least the component (A) and the component (B). ##STR00001##