The broad range of BTC’s emulsifiers for emulsion polymerization processes allows the customer to choose the best matching product in order to obtain stability in the prepared polymer dispersion. BTC´s emulsifiers for emulsion polymerisation processes are derived from natural and synthetic feedstock.
Disponil®, Emulphor®, Lutensit®, Lutensol®
Properties of our emulsifiers
Our Disponil® grades are either of nonionic or of anionic character. All grades are supplied as liquid solutions. Emulphor® and Lutensit® grades are anionic surfactants with wetting and emulsification properties. Lutensol® TO grades are nonionic surfactants. They are fatty alcohol ethoxylates providing stabilization properties for colloidal systems. Emulsifiers with a concentration below 50% contain a preservative additive. Especially the anionic emulsifiers are diluted to approximately 30%. They are fatty alcohol sulphates, fatty alcohol ether sulphates, fatty alcohol ether phosphates and sulfosuccinates. According to their molecular structure they are used as single emulsifier or they are used in combination with nonionic emulsifiers.
All Disponil® grades are free of sodium chloride and the remaining salt content of sodium sulphate is reduced to a very low limit. With regard to the 1,4 Dioxan content in fatty alcohol ether sulphates (FES) the level is reduced to a limit depending on the ethoxylation degree. Overall the content is below 150 ppm, whereas the lowest is < 5ppm. Those narrow ranged by-products of the main product are mandatory in sensitive applications like emulsion polymerisation processes. In addition most of the emulsifiers are FDA or BfR (Bundesinstitut für Risikobewertung) approved.
Applications of our emulsifiers
Emulsion polymerisation is an environmentally benign production method to produce polymers. Liquid monomers or gaseous monomers that are liquefied by pressure are homo or co-polymerised in an aqueous phase in the presence of emulsifiers. Such emulsifiers are added at a concentration level above the CMC (critical micelle concentration) to solubilize the monomers. During the polymerisation the size of the micelle swells and needs to be stabilized either by repulsion effects, obtained by anionic surfactants or steric stabilization, obtained by molecular structure. After polymerisation the obtained polymer dispersion needs to be stabilized until it is used. The versatile combination of monomers and the different usage of the achieved polymer dispersion triggers a broad investigation effort to find the best suited emulsifier.