Takayama, T., Komabayasi, K., Itou, M., and Miyake, Y., "Development of Bio-Based Plastics for Injection Molding," SAE Int. J. Mater. Manuf. 2(1):12-17, 2009, doi:10.4271/2009-01-0019.
Technological development of materials derived from plants (e.g., polylactic acid (PLA), and the like) is required to break dependence on fossil fuels and reduce CO₂. PLA has inferior hydrolysis resistance, impact resistance, and molding ability than polypropylene (PP), and in order to overcome these disadvantages, a novel PP/PLA alloy has been conceived where PLA is incorporated into a PP matrix. By optimizing compatibilizer and elastomer addition, PLA has been successfully dispersed into a PP matrix at a sub-micron order, and interior parts have been successfully developed that fulfill the performance, appearance, and mass-production capability requirements for practical application.