diluted with monomer the catalyst was benzoyl peroxide 50 antioxidant 1 was 2 6 di tertiary butyl n n dimethylamino para cresol and antioxidant 2 was 2 6 di tertiary butyl para cresol raw material a b c d e f reactive carrier 73 7 66 6 66 6 66 6 66 6 66 6 microspheres 15 8 16 7 16 7 16 7 16 7 16 7 benzoyl peroxide 50 paste 10 5 16 7 16 7 16 7 16 7 16 7 1 4 nq soln 1 5 10 u2212 3 1 5 10 u2212 3 antioxidant 2 2 5 10 u2212 3 2 5 10 u2212 3 5 0 10 u2212 3 5 0 10 u2212 3 antioxidant 1 1 5 10 u2212 3 1 5 10 u2212 3 1 5 10 u2212 3 1 5 10 u2212 3 total 100 100 100 100 100 100 shelf stability gt 90 days gt 90 days gt 330 days gt 330 days gt 330 days gt 330 days the results showed that the peroxide could be stabilized in a non diluted low viscosity unsaturated polyester resin in the presence of microspheres 1 10 1 4 1 2 1 1 resin composition styrenated unsaturated 43 74 35 23 28 28 24 33 polyester resin monomer 8 75 12 92.