What is the difference between TPE/TPR plastic package PP package PS benzobenzene?

The detailed description of TPE/TPR encapsulation material PP, PS, benzene, benzene modification is as follows:
TPE/TPR coating material PP, PS, transparent benzene, benzene modification refers to the use of TPE or TPR materials on PP (polypropylene), PS (polystyrene), transparent benzene, benzene modification and other substrates coating process.
• TPR coating PS material: the appearance is transparent or natural particles, the hardness is between 30-80A Shore. The material has the resilience of rubber, excellent adhesion with PS (modified benzene), good wear resistance and scratch resistance. At the same time, TPR material has the characteristics of comfortable and smooth touch, good material flow, easy processing and forming. In addition, TPR packaging material does not contain halogens, nonylphenol NP, polycyclic aromatic hydrocarbons Pahs, plasticizers 16P, 6P, in line with the latest directive ROHS, REACH, as well as the toy industry EN71 related directive standards.
• TPE coating PP: The SP (solubility parameter) of TPE is 7.2, and the SP of PP is 7.5, according to the chemical similarity compatibility principle, the two have good bonding and fusion, and the coating effect is excellent.