Patent ID: 8445605

Claim:
A halogen-free flame retardant resin composition, calculating according to the parts by weight of organic solids, comprising: (A) 40-80 parts by weight of the mixture of a phenoxyphosphazene compound (A1) and a dihydrobenzoxazine ring-containing compound (A2), and, the weight ratio between the phenoxyphosphazene compound (A1) and the dihydrobenzoxazine ring-containing compound (A2) being between 1:10 and 1:2; (B) 15-45 parts by weight of a polyepoxy compound; (C) 5-25 parts by weight of a phenolic resin hardener; (D) 0.1-1 parts by weight of an imidazole compound as the curing accelerator, wherein the softening point of the phenoxyphosphazene compound is between 60° C. and 150° C.; the phenoxyphosphazene compound (A1) is a mixture of the cyclophenoxyphosphazene compounds shown with the structural formula (α) and the linear phenoxyphosphazene compounds shown with the structural formula (β), and the components comprise the following: hexaphenoxycyclotriphosphazene compound (m=3), of which the weight ratio is between 70% and 90%; octaphenoxycyclotetraphosphazene compound (m=4), of which the weight ratio is between 3% and 20%; and other cyclophenoxyphosphazene compounds (m≧5), and the linear phenoxyphosphazene compounds, of which the weight ratio are between 1% and 10%; wherein, m represents an integer between 3 and 25; wherein, X represents —N═P(OC 6 H 5 ) 3 or —N═P(O)C 6 H 5 , and Y represents —P(OC 6 H 5 ) 4 or —P(O)(C 6 H 5 ) 2 ; n represents an integer between 3 and 100.