<正>1.Production Situation The research and development of SBC dates back to the middle of 1970s in China.At that time,SBS was the main product.In 2007,the produclion capacity of Chinese SBC was 260,000 tons,and all the production devices were subordinate to Sinopec Group with the market controlled by Sinopec and the imported producis.In May 200X,the establishment and operation of 100,000 tons/year of SBS production