PVP K Series
PVP is synthesized via a free radical polymerization reaction starting from the vinylpyrrolidone (VP) monomer, using a free radical initiator such as Azobisisobutyronitrile (AIBN).PVP works as a film former, viscosity controller, emulsion stabilizer, binder, and a hair fixative in cosmetics and personal care products. It is the leading vinylpyrrolidone polymer to be used in cosmetics. PVP likes to adhere to surfaces like the skin and hair and creates a smooth, uniform film there. The film is helpful for maintaining a hairstyle and extending the use of sunscreen and colored cosmetics. The film is somewhat fragile due to PVP, which is hygroscopic and loves water, making it susceptible to destruction.
It prevents the hair from absorbing moisture when used in hair care products, which helps the hair maintain its style. However, due to its hygroscopic nature, hair styled with a PVP based product loses its style in high humidity.
To fix this problem, there are now several versions of VP containing film formers that are less sensitive to humidity, for example, the molecule called VP/VA Copolymer. It is used at a concentration of 0.005-35% in leave-on products and at 0.000003-13.3% in rinse-off products.
Polyvinylpyrrolidone (PVP), a non-ionic polymer, has been employed in multifarious fields such as paper, fibers and textiles, ceramics, and pharmaceutics due to its superior properties.
Especially in pharmacy, the properties of inertness, non-toxicity, and biocompatibility make it a versatile excipient for both conventional formulations and novel controlled or targeted delivery systems, serving as a binder, coating agent, suspending agent, pore-former, solubilizer, stabilizer, etc. PVP with different molecular weights (MWs) and concentrations is used in a variety of formulations for different purposes.
Key Technical Parameters
Cosmetic Grade Polyvinylpyrrolidone(PVP)
| Product | PVP K30P | PVP K80P | PVP K90P | PVP K30 30%L | PVP K85 20% L | PVP K90 20%L |
| Appearance | White or off-white powder | Clear and colorless to slightly yellowish liquid | ||||
| K Value (5% in water) | 27~35 | 75~87 | 81~97 | 27~35 | 78~90 | 81~97 |
| pH( 5% in water) | 3.0~7.0 | 5.0~9.0 | 5.0~9.0 | 3.0~7.0 | 5.0~9.0 | 5.0~9.0 |
| N-Vinylpyrrolidone | 0.03% max. | 0.03% max. | 0.03% max. | 0.03% max. | 0.03% max. | 0.03% max. |
| Sulphated Ash | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. |
| Solid Content | 95% min. | 95% min. | 95% min. | 29~31% | 19~21% | 19~21% |
| Water | 5.0% max | 5.0% max. | 5.0% max. | 69~71% | 79~81% | 79~81% |
| Heavy Metals (As Pb) | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. |
Pharmaceutical Grade Polyvinylpyrrolidone(PVP)-Povidone
| Product | Povidone K15 | Povidone K17 | Povidone K25 | Povidone K30 | Povidone K90 |
| Appearance | White or yellowish-white,hygroscopic powder or flakes | ||||
| Solubility | Freely soluble in water in ethanol(96%)and in methanol,very slightly soluble in acetone | ||||
| Appearance of Solution | Clearly and not more intensely coloured than reference solution B6,BY6 or R6 | ||||
| Identification | A. IR spectrum obtained is consistent with that abtained with Povidone CRS. | ||||
| B.An orange-yellow precipitate is formed | |||||
| C.A pink colour is produced | |||||
| D.A red colour is produced | |||||
| E.The substance dissolves | |||||
| pH(5% in water) | 3.0~5.0 | 3.0~5.0 | 3.0~5.0 | 3.0~5.0 | 4.0~7.0 |
| K Value | 12.75~17.25 | 15.30~18.36 | 22.50~27.00 | 27.00-32.40 | 81.00~97.20 |
| Aldehydes | 500 ppm max. | 500 ppm max. | 500 ppm max. | 500 ppm max. | 500 ppm max. |
| Peroxides | 400 ppm max. | 400 ppm max. | 400 ppm max. | 400 ppm max. | 400 ppm max. |
| Formic Acid | 0.5% max. | 0.5% max. | 0.5% max. | 0.5% max. | 0.5% max. |
| Hydrazine | 1 ppm max. | 1 ppm max. | 1 ppm max. | 1 ppm max. | 1 ppm max. |
| Impurity A | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. |
| Impurity B | 3.0% max. | 3.0% max. | 3.0% max. | 3.0% max. | 3.0% max. |
| Heavy Metals | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. | 10 ppm max. |
| Water | 5.0% max. | 5.0% max. | 5.0% max. | 5.0% max. | 5.0% max. |
| Sulphated Ash | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. |
| Nitrogen Content | 11.5~12.8% | 11.5~12.8% | 11.5~12.8% | 11.5~12.8% | 11.5~12.8% |
Technical Grade Polyvinylpyrrolidone (PVP)
| Product | PVP K15P | PVP K17P | PVP K25P | PVP K30P | PVP K90P | PVP K30L | PVP K90L |
| Appearance | White or off-white powder | Colorless to yellowish liquid | |||||
| K Value | 13~18 | 15~19 | 23~28 | 27~35 | 81~100 | 27~35 | 81~100 |
| pH( 5% in water) | 3.0~7.0 | 3.0~7.0 | 3.0~7.0 | 3.0~7.0 | 5.0~9.0 | 3.0~7.0 | 5.0~9.0 |
| NVP | 0.2% max. | 0.2% max. | 0.2% max | 0.2% max. | 0.2% max. | 0.2% max. | 0.2% max. |
| Sulphated Ash | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. | 0.1% max. |
| Solid Content | 95% min. | 95% min. | 95% min. | 95% min. | 95% min. | 29~31% | 19~21% |
| Water | 5.0% max. | 5.0% max. | 5.0% max. | 5.0% max. | 5.0% max. | 69~71% | 79~81% |
Applications
● Personal Care Products
● Health care products
● Hair care products
● Pharmaceutical industry
● Textiles,Coatings,Laundry,Ceramics,Adhesives
Advantages
● Good Stabilization
● Solubility in water and many other organic solvents
● Good compatibility
● Biological compatibility
● Toxicological safeness
● Eco-friendly
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