Hangzhou Rainbow Import And Export Co., Ltd. was founded in 2004 as an international sales company specializing in the overall resource planning for the enterprises under STD (Hangzhou Sunflower Technology Development Co., Ltd.), marketing, product promotion as well as customer service. Based on a host of technical professionals from STD which is led by professor-class senior engineer Wu Jiaxiang who is also one of the most famous scientists and creators of PVP in China, our company has been approved as a high-tech enterprise by Zhejiang Provincial Government. Our company has almost 30 years of experience in technical innovation, project development and marketing, and has mastered several dozen special techniques about fine chemicals. The most outstanding is PVP and Pyrrolidones products. We keep the lead of PVP development in China. Our company, in order to adapt to the increasing demands