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Hangzhou Rainbow Import & Export Co.,Ltd

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Our History


Zhejiang Sunflower New Material Co.,Ltd. which was predecessor of STD, engaged in PVP, was set up and Mr. Wu Jiaxiang,the chief expert of the state’s R&D project for PVP in China, was appointed as the general manager.


Changed into a private company, Hangzhou Sunflower Technology Development Co., LTd.(STD) was set up and continuing the developing and producing PVP series both in technical grade and cosmetic grade.

2004 Zhejiang MY Sunflower Pharmaceutical Co.,Ltd. which is JV of STD was established for production of PVP in Pharm.Grade. GMP workshops were founded for POVIDONE, POVIDONE IODINE and POVIDONE IODINE SOLUTION.

Huzhou Sunflower performance polymer Co.,Ltd (SPP) the subsidiary of STD was founded to have more products, enlarge the capacity and set up new GMP workshop.


SPP expand the factory from 4000M2 to 12,000M2. After that the capacity of 3500tons of powder and 5000tons of liquid products annually till the end of 2011.


Huzhou Sunflower Pharmaceutical Co. Ltd.(S-Pharma) was set up on the basis of the pharmaceutical department of (STD). S-Pharma inherits all STD’s assets such as facility, technology, products, team, management and trademarks, and focus on the development and producing of pharmaceutical excipients and API’s. Led by Mr. Wu Jiaxiang, the main PVP founder in China, the team possessed tens of concerned process and application techniques, gathered 35 years of experience of sustainable R&D, engineering practice and marketing, specially in Polyvinylpyrrolidone series (Povidone, Crosspovidone, Copovidone and Povidone iodinated), Chondroitine Sulfate Sodium series and artificial cultivating of Cordyceps. The company is well known as full range covering, high quality and good service in the industry. The company is widely praised by the customer both at home and abroad.


Our Factory

The company has the GMP production lines of 600 tons annually of Povidone at low molecular weight ( Povidone K12, K15, K17, K25 and K30), 800 tons annually of Povidone at high molecular weight ( Povidone K60, K90, K120), 300 tons annually of Povidone Iodinated with high stability and 100tons annually of Chondroitine Sulfated Sodium. The company also first finished the industrial cultivation of artificial cultivating of Cordyceps and the concerned products are under marketing now. HSP will take pharmaceutical biological products or biological extracts with advantage of techniques or resources as the new development direction



Our Product

Povidone K Series; Copovidone; Povdone Iodine; Crospovidone;

Product Application


K15  K17  

Dispersing agent for carbon black pigment.

Enhancement of the non-image area on lithographic plates.

K15  K17  K30

Dye transfer inhibition in detergents


Textile dye stripping and strike rate control

To inhibit sulfide salts redeposition on photo processing

Soil redeposition in laundry detergent.

Latex stabilizer in emulsion polymerization.

K30  K90

Dispersing agent for nonaqueous dye and pigment-based writing ink fluid loss control agents in oil field cementing

Creating voids in Hollow fiber membranes mamif.

Fiber glass sizing agent with PVAc.

Combustible ceramic binders.

Tablet binder for industrial and Parma. Applications.


adhesive for toilet paper rolls

K85  K90

Protective colloid for expandable ps manufacture.adhesives for glue sticks

Component in water-based coating systems for CRT fabrication.

Electro lead hydrogels

Engine stabilization.

K90  K115

Thickeners in metal quenching agent bath.




Povidone K30、K25、K90 in common use

Povidone K25 suitable in low viscosity or high concentration solution

Povidone K90 suitable in high viscosity or  low concentration solution


Povidone K17、K25、K30 for injections etc.

Povidone K25/K30 for oral or external preparations


Povidone K25/K30 for sugar coating and film coating


Povidone K90 for liquid preparations


A HIGH EFECTIVE DRY BINDER very suitable in tableting mixtures by wet granulation tableting mixtures by dry granulation direct compression

A GOOD GRANUTATING BINDER very suitable in production of granulates as a dosage form or for filling into hard gelatin capsules

A NEW FILM FORMING AGENT IN SUGAR COATING/FILM COATING etc. possessing less hydroscopic great elasticity and less tacky, favorably combine with cellulose derivatives

A HIGH EFECTIVE DRY BINDER Possessing fast dissolution for all excipients in any tableting processes, be added before or after granulation, or part before and part after with consistent swelling action and disintegration.


A STABILIZER FOR SUSPENSION to physically stabilize oral and topical suspensions by reducing sedimentation rate and increasing its volume and  redispersibility, suitable for instant drink powders/granulates or ready to use suspension.

FILTRATION AIDS clarification or purification of aqueous or alcoholic herbal extracts and tinctures as result of forming stable complexes with tannins and polyphenols



Our Certificate



Production Equipment


Company Profile
Company Name: Hangzhou Rainbow Import & Export Co.,Ltd Company Type: Enterprise Units ()
Area: Zhejiang Company scale:
Registered assets: Not filled Year of registration: 2002
Certificates:       Certification information through
cash deposit: paid 0.00 Dollar