Abstract: The invention provides an organic silicon phosphate and fabrication method thereof. The organic silicon phosphate has formula (I): wherein R1 and R2 are the same or different and represent C1-C5 alkyl; R3 and R4 are the same or different and represent hydrogen, C1-C5 alkyl; R5 is aryl or C1-C5 alkyl; Y is a linking bond containing —CH2—, —C(CH3)2—, —S—, —SO2—, —O—, —CO—, or —N?N—; m is an integer from 0 to 4; n is 0 or 1 and k is an integer from 0 to 9.

Abstract: Disclosed is an epoxy resin composition featured by comprising a phosphate with phenolic or benzoxazine groups for enhancing flame retardancy. The phosphate used herein has higher molecular weight and higher viscosity than conventional ones. Because the phosphate is able to react with the epoxy resin at high temperatures, greater amounts of phosphate can be added to the epoxy resin to increase the viscosity of the epoxy resin prepreg for copper clad laminates or printed circuit plates.