However, addition of a thermoplastic polyolefin alloy
(TPO), PP/ethylene–propylene copolymer, increased the compatibilizing efficiency of PP-g-MA to a level comparable to that of SEBS-g-
MA. Improved efficiency of SEBS-g-MA and PP-g-MA 1 TPO compared to PP-g-MA or LLDPE-g-MA is attributed to better emulsification
of the former at the interface, reduced migration of PP-g-MA into the PP phase and retardation of PET crystallization in the presence of the
elastomeric additive.