Processes

Polycondensation

Polycondensation or step-growth polymerization is often used for the processing of adhesives, coatings, engineered plastics, fibers, films and many high-performance polymers.

During the polycondensation reaction, the volatile monomers are evaporated from the lower molecular weight pre-polymers to form polymers with a higher molecular weight.

In LIST KneaderReactors the high process temperatures and low vacuum levels in combination with robust mixing and frequent surface renewal allow a quick removal of the monomers, maximizing the mass transfer efficiency.

Highly flexible LIST KneaderReactors enable the polycondensation of various polymer grades in one single machine without having to retool between the production campaigns.

Properties

  • Effective self-cleaning to minimize dead zones, product accumulation and product degradation

  • Excellent kneading and mixing for better homogenization

  • Low shear processing

  • Effective heat transfer

  • High surface renewal efficiency

  • Large free vapour volume

  • Precise and uniform temperature control due to large heat transfer areas

  • Continuous processing

  • Processing of sticky and highly viscous products

  • Narrow residence time distributions (plug flow)

  • Wide and flexible range of average residence times

  • Reliable process scale-up from pilot to industrial units

  • High conversion rates

  • Reaction at almost stoichiometric conditions

Examples

Polyamide
High performance polyamides for high temperature applications

Polydextrose
Low caloric food additive

Polyaspartic Acid (PASA)
Polyaspartic acid as additive for washing powder

Polyester
Special grade polyesters e.g. for medical applications

Epoxy Resin
Thickener for paints and coatings

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More about us

LIST KneaderReactor

Where viscosity cannot be a limitation. LIST kneader reactors operate in the concentrated phase—self-cleaning, vacuum-compatible, and capable of handling the highest energy inputs. From lab-scale kneaders to large-scale industrial plants, for the chemical, fiber, polymer, and recycling industries.

Service

LIST services ensure maximum plant availability through maintenance, modernization, and technical support throughout the entire lifecycle.

About Us

The BUSSLIST Group combines three process technologies that cover the most demanding stages of material processing—from high-viscosity reactions and temperature-sensitive compounding to precise solidification.