Patent ID: 8581107
Filing Date: 2013-11-12
Classification: C08G,C08L,H05K

Abstract:
1. A halogen-free flame-retardant epoxy resin composition comprising: (A) a halogen-free epoxy resin having at least two epoxy groups in one molecule; (B) 10.0 to 20.0 parts by weight of a copolymer of styrene and maleic anhydride as a first curing agent, based on 100 parts by weight of the halogen-free epoxy resin, the copolymer of styrene and maleic anhydride being represented by the following general formula (I): wherein m is an integer of 1 to 6, and n is an integer of 2 to 12; and (C) 25.0 to 70.0 parts by weight of poly(m-phenylene methylphosphonate) as a second curing agent, based on 100 parts by weight of the halogen-free epoxy resin, poly(m-phenylene methylphosphonate) being represented by the following general formula (II): wherein m and n are 0 or 1, and p is an integer such that the number average molecular weight is less than 1000, a weight ratio of poly(m-phenylene methylphosphonate) to the copolymer of styrene and maleic anhydride being 2.7:1.