Emulsion Polymerization Application FAQs
Why is Selvol PVOH preferred for vinyl acetate-based emulsion polymerization?
Selvol PVOH is one of the most widely used polymers for colloidal stabilization of vinyl acetate emulsions. It delivers superior adhesion to hydrophilic substrates, good wet tack, rapid setting speed, heat resistance and crosslinkability. These properties are difficult to achieve with alternative stabilizers.
How does molecular weight affect the final emulsion properties?
Higher molecular weight Selvol PVOH grades produce emulsion polymers with higher viscosity, increased shear thinning, greater tensile strength and higher wet tack. Selecting the appropriate molecular weight is critical to hitting target performance specs in your end product.
What impact does hydrolysis level have on emulsion stability and freeze-thaw performance?
Lower hydrolysis levels improve freeze-thaw stability and water sensitivity while maintaining good emulsion stability. Higher hydrolysis grades produce larger particle sizes and lower viscosities. For adhesive applications requiring enhanced wet tack and faster set speeds, Selvol PVOH 418 (92% hydrolyzed) is a strong candidate.
What are the Selvol PVOH 800 grades, and when should I use them?
Selvol PVOH 800 grades are enhanced formulations designed specifically for emulsion polymerization use. They offer greater cold water solubility, low foaming, reduced gel content and reduced dusting compared to standard grades.
SEKISUI manufactures these across facilities in Kentucky, Texas, Mexico and Spain, with packaging options from 25 kg bags to 1,000 kg supersacks. This makes them accessible for both development-scale and full production runs.
What factors should I evaluate before selecting a PVOH grade for my emulsion process?
Consider the composition of the emulsion you’re producing, your polymerization conditions and your final product’s desired properties. Small changes in process conditions or raw material ratios can meaningfully shift viscosity and coagulum levels.
If standard grades don’t fully meet your requirements, SEKISUI also develops custom PVOH formulations. Speak with our Technical Service Team for tailored guidance.
