The key process parameters influencing asphalt modified chassis builders in asphalt or bitumen modification include temperature, shear rate, and mixing time. Temperature affects the viscosity and workability of the asphalt, while shear rate influences the dispersion of modifiers. Additionally, mixing time is crucial for achieving uniformity and optimal performance of the modified asphalt. Proper control of these parameters ensures enhanced properties such as improved durability, flexibility, and resistance to deformation in the final product.