Aqueous Polymer Dispersion
Identifiers
Functions
Where is aqueous polymer dispersion used, and what role does it play in each application?
Aqueous polymer dispersion functions primarily as a binder in paper coating slips, as evidenced by a patent application for packaging applications. In this role, it binds pigments and other coating components to the paper substrate, providing cohesion and adhesion. The dispersion is produced via emulsion polymerization of vinyl aromatic compounds (e.g., styrene) and conjugated aliphatic dienes (e.g., butadiene), with acid-group monomers to stabilize the system. Its use is concentrated in industrial coating formulations where a water-based binder is required, rather than in consumer products or clinical settings.
Which product or formulation problem does aqueous polymer dispersion address?
Aqueous polymer dispersion solves the formulation problem of creating a stable, water-based binder system for paper coatings. It enables the production of a coating slip with the necessary rheological and film-forming properties for packaging applications. The dispersion's polymer composition—combining vinyl aromatic and diene monomers with acid groups—provides a balance of hardness, flexibility, and adhesion that is difficult to achieve with simple solutions or other binder types. This addresses the need for a coating that adheres well to paper, forms a continuous film, and performs under end-use conditions.
What supports the main commercial or clinical uses of aqueous polymer dispersion?
The main commercial use of aqueous polymer dispersion as a paper coating binder is supported by a granted European patent (EP3891193B1) assigned to BASF SE, which describes a specific preparation method. The patent claims a process for producing the dispersion via free-radical emulsion polymerization, with defined monomer ratios and a dual peroxide initiator system. This indicates a claimed approach for manufacturing a binder suitable for paper coating slips. However, patent evidence reflects a claimed method, not necessarily widespread market adoption. No clinical or consumer product evidence is available.
How is Aqueous polymer dispersion used clinically?
For diluting or dissolving drugs for intravenous, intramuscular or subcutaneous injection, according to instructions of the manufacturer of the drug to be administered
Which formulation trade-offs should researchers consider for aqueous polymer dispersion?
Researchers must balance monomer composition and initiator system to achieve desired coating performance. The patent specifies 40–75 parts vinyl aromatic, 24.9–59.9 parts diene, and 0.1–10 parts acid monomer, indicating that adjusting these ratios affects properties like hardness and flexibility. The dual peroxide system (inorganic and organic) requires careful metering: the inorganic peroxide starts with the vinyl aromatic feed, while the organic peroxide is added after 5–20% of the vinyl aromatic has been fed. This process control is critical to avoid issues like uncontrolled polymerization. The dispersion can be used at 1–50% concentration, offering formulation flexibility but also cost-performance trade-offs.
What are the physicochemical properties of Aqueous polymer dispersion?
| Property | Value | Category |
|---|---|---|
| Physical Description | Water appears as a clear, nontoxic liquid composed of hydrogen and oxygen, essential for life and the most widely used solvent. Include water in a mixture to learn how it could react with other chemicals in the mixture, Liquid, Clear colorless odorless liquid | Appearance |
| Color/Form | Colorless liquid, Liquid | Appearance |
| Odor | Odorless | Appearance |
| Taste | Tasteless | Appearance |
| Solubility | Completely miscible, Water dissolves some amount of virtually every solid or gas with wich it comes in contact, Very soluble in ethanol, methanol, acetone, 55.5 mol/L | Formulation Relevant Properties |
| LogP | -1.38 | Formulation Relevant Properties |
| Boiling Point | 212 °F at 760 mmHg, 100, 99.974 °C | Handling Relevant Properties |
| Melting Point | 32 °F, 0, 0 °C | Handling Relevant Properties |
| Density | 1, 0.9950 g/cu cm at 25 °C, Chemical and physical properties, Expands on freezing. Temp of max density 3.98 °C. density: 1.000000g/mL at 3.98 °C; 0.917 g/cc at 0 °C (ice); 0.999868 at 0 °C/4 °C (liquid), Weight of sea water: approximately 63.93 lb/cu ft at 15 °C; density of sea water: approximately 1.025 g/cu cm at 25 °C, Ice Properties | Handling Relevant Properties |
| Vapor Pressure | 23.75 [mmHg], VP: 760 mm Hg at 100 °C, VP: 611.657 Pa at 273.16 K | Handling Relevant Properties |
Which formulation benchmark best contextualizes aqueous polymer dispersion, and what differs?
A relevant formulation benchmark is the paper coating slip, where aqueous polymer dispersion serves as the binder. The patent explicitly identifies this product type, distinguishing it from other coating applications like paints or adhesives. In paper coating, the dispersion must provide strong binding to cellulose fibers and pigments, while maintaining slip properties for application. Compared to other binder systems, this dispersion's specific monomer composition (styrene-butadiene type) is tailored for packaging paper, where durability and printability are key. The concentration range of 1–50% allows formulators to adjust binder levels based on desired coating weight and cost.