PVP - Water-Soluble Polymer CAS 9003-39-8

Polyvinylpyrrolidone (PVP, CAS 9003-39-8): Properties

1. Definition and General Description

Polyvinylpyrrolidone (abbreviated as PVP) is a synthetic polymer based on the monomer N-vinylpyrrolidone. Its unique physicochemical characteristics make it valuable in various industries – from pharmaceuticals to food products.

CAS: 9003-39-8

Synonyms: PVP, Polyvidone, Kollidon

2. Molecular Formula and Structure

General formula of the repeating unit: [C₆H₉NO]ₙ

Chemical nature: Contains a pyrrolidone ring attached to the main carbon chain.

3. Physicochemical Properties

Appearance: Typically white or slightly yellowish powder (for lower molecular weights) or granules; may be available as high-viscosity aqueous solutions.

Odor: Neutral or barely perceptible.

Density: Depends on the degree of polymerization; approximately 1.2 g/cm³ for solid forms.

Melting point: Decomposes at high temperatures (usually >200°C); does not have a defined melting point as it is a polymer.

Flash point: Difficult to determine due to the absence of a classic liquid and flammable fractions.

Solubility: Readily soluble in water, alcohols (ethanol, isopropanol), and organic solvents such as DMSO.

Decomposition: Upon overheating above 200–230°C, thermal degradation begins, releasing nitrogenous compounds and others.

Storage conditions: Store in a dry place at 15–25°C; non-explosive.

Stability: Stable during storage; not subject to hydrolysis due to the structure of the pyrrolidone ring.

4. Applications

Pharmaceuticals: Binder in tablets, film-former for tablet coating, stabilizer for suspensions.

Food industry: Clarifying agent in beer and wine technology, foam stabilizer.

Cosmetic industry: Shampoos, lotions, hair sprays; improves film formation and moisturizing properties.

Industrial adhesives and paints: Provides adhesion to various surfaces, increases viscosity.

5. Potential Impact

Safety: PVP is considered biologically inert, non-carcinogenic; when ingested in small amounts, it is excreted from the body.

Ecology: When released into wastewater, it undergoes partial biodegradation, although the process is not very fast for high molecular weights.

6. Conclusion

Polyvinylpyrrolidone (CAS 9003-39-8) is a versatile, biocompatible polymer with a wide range of applications. Its solubility in water and organic solvents, stability, and non-toxicity make it an important component in numerous formulations – from pharmaceutical tablets to cosmetic products.