| 摘要 |
<p>The surface of a powdery rubber obtained by grinding waste rubbers composed of various rubber species is unevened. In the unevening treatment, use can be made of a method comprising culturing a microorganism which utilizes rubber as the sole carbon source in the presence of the powdery rubber having an average grain size of 1 mm or less. Thus, the powdery rubber is decomposed and the surface area thereof is enlarged, thereby giving a rubber composition excellent in fracture properties, friction resistance and crack growth resistance. As the microorganism, WU-YS05 strain belonging to the genus Pseudonocardiaceae (Patent Microorganism Depository Accession No.:FERM P-18660) can be efficaciously employed.</p> |
