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 of PVP products at home and abroad, has also established a new plant named Huzhou Sunflower Performance Polymer Co., Ltd. which is strictly in compliance with GMP requirements. Now, the main business scope of our company covers all ranges of PVP products, including PVP K series, PVP/VA, PVPP and PVP-I (Povidone Iodine) which are manufactured in accordance with current USP, EP, BP, JP and CP.

The annual production capability can reach 1500 tons. Rainbow also deals in chondroitin sulphate, some fashion accessories and daily necessities. Most of our products are exported to Europe, America, Southeast Asia, Africa and the Middle East.

Holding "Innovation and Civility" as our ideal and "Specialty, Suitability and Superiority" as our purpose, it is our wish to forge mutually beneficial business with customers from all over the world.