Kobe is a port city that was opened to the world about 155 years ago and is known as one of the birthplaces of the modern rubber industry in Japan. Since then, rubber has continued to be an important industry at Kobe, which is also closely related to the establishment of the Department of Chemical Science and Engineering at Kobe University. Here, I introduce some of the topics related to rubber at Kobe University. The topics are 1) Hydrophobic polythiophenes based on surface entropy effect, where poly (3-hexyl thiophene) (P3HT) is shown to be intrinsically hydrophobic water contact angle>100 degree, 2) Rubbery polythiophenes with siloxane crosslinking; Conventional electro-conducting polymers are mechanically brittle. Here, cyclic siloxane moieties were introduced as side chains, which act as both internal plasticizer and crosslinking point, then P3HT became rubbery and showed mechanically reversible. 3) Interface analyses between hot-melt elastomer and isotactic polypropylene; the thickness of the interface was found to be micrometer order evaluated using several methods, 4) 3D printing of rubber for the soles of running shoes.