Introduction: The polymer polyol Tpop-2020 is a kind of general polyether polyol as the parent, through styrene and acrylonitrile monomer and initiator, under the specific temperature and nitrogen of graft copolymerizeation. This product is BHT free, amine free, low residuer monomer, low residue monomer, low viscosity, the product has excellent, the use environment friendly antioxidant, the product processing tolerance is large, the preparation of foamed materials fluidity, bubble even and delicate, suitable for producing soft high load block and hot plastic foam and other fields.