PVC Suspension Polymerization

METHOCEL™ cellulose ethers are time tested suspending agents for vinyl chloride polymerization providing particle size control, uniform particle size distribution, and porosity that can be optimized f

An important characteristic of polyvinylchloride (PVC) is its ability to absorb additives, such as plasticizers, stabilizers, and pigments, quickly and in sufficient quantities. To achieve this goal a defined level of porosity is required which is often obtained at the expense of bulk density. The balance of porosity and bulk density is a constant issue for the suspension PVC producer, who is striving for the best compromise.

The particle morphology of PVC is partly influenced by polymerization conditions (temperature, reactor size, stirring conditions, etc.). The largest influencer is the selection of the surface-active suspending agent.

Suspending agents reduce interfacial tension and facilitate the dispersion of vinyl chloride monomer droplets. The suspending agent also reduces droplet size and encapsulates them in a protective film, preventing the droplets from coalescing during polymerization.

Our Solutions

Given the need for high purity and consistent properties, METHOCEL™ cellulose ethers have been used for many years as suspending agents for the polymerization of vinyl chloride. They provide particle size control, uniform particle size distribution, and porosity that can be optimized for many PVC end-uses.

Low-viscosity METHOCEL™ cellulose ethers are most suitable for PVC polymerization. A broad range of substitution levels helps choosing the right METHOCEL™ for specific PVC polymerization conditions and applications. For example, one can choose a specific METHOCEL™ for rigid PVC with low porosity or flexible PVC with high porosity.

METHOCEL™

METHOCEL™

Benefits/Property
Interfacial tension; Thermal gelation; Water-solubility; Organo-solubility

Applications
Rigid PVC with low porosity and high bulk density; Flexible PVC with high porosity and low vinyl chloride monomer residues

Your Applications

The broad range of low-viscosity METHOCEL™ cellulose ethers allows for selection of an ideal suspending agent, yielding a PVC to help you meet your demanding specifications.
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Dow and ChemPoint formed a strategic partnership in April 2014 to establish a new order, delivery and service model, specifically designed to meet customer needs in industrial applications, for CELLOSIZE™ hydroxyethyl cellulose polymers, ETHOCEL™ ethylcellulose polymers, METHOCEL™ cellulose ethers, POLYOX™ water-soluble polymers, and WALOCEL™ CRT products. Our collective goal is to enhance the customer experience by providing a higher degree of service and support powered by a dedicated technical marketing & sales team focused exclusively on Dow’s cellulosic and poly(ethylene oxide) offerings in industrial applications. 

The industrial cellulosics team at ChemPoint acts as a fully-integrated extension of Dow and is always available to facilitate customer needs for product selection, technical support, order placement and fulfillment. In addition, our customers receive needed support from ChemPoint’s customer service and supply chain professionals to ensure on-time delivery and high service levels.