Fecha de publicación: -- Fuente: WIPO "tomato" The present disclosure relates to a polymorphic Form B of 3-(3,5-di-tert-butyl-4-hydroxy-phenyl)-propionic acid 6-[3-(3,5-di-tert-butyl-4-hydroxy-phenyl)-propionyloxy]-hexahydro-furo[3,2-b]furan-3-yl ester wherein the polymorphic Form B is crystalline, having an X-ray powder diffraction pattern (CuKα) comprising peaks at 2-theta about 8.48, 10.18, 12.28, 12.62, 13.42, 15.14, 16.39, 17.32, 17.76, 18.42, 19.12, 19.74, 20.89, 21.52, 23.58 and 24.73. The present disclosure also relates to a process of preparation of a polymorphic Form B of 3-(3,5-di-tert-butyl-4-hydroxy-phenyl)-propionic acid 6-[3-(3,5-di-tert-butyl-4-hydroxy-phenyl)-propionyloxy]-hexahydro-furo[3,2-b]furan-3-yl ester. The polymorphic Form B is used for thermos-oxidative stabilization of polyolefins. The present disclosure also provides a composition for thermo-oxidative stabilization of polyolefins. All the properites such as oxygen induction time (OIT), change in melt flow index (MFR), yellowness index (YI), Change in yellowness index have been improved without compromising the mechanical property.