Takayama, T., Komabayasi, K., Itou, M., and Miyake, Y., "Development of Bio-Based Plastics for Injection Molding," SAE Int. J. Mater. Manf. 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.