Rheology is the study of deformation and flow of matter under applied forces. This flow and deformation can be measured using various rheological methods. Besides viscosity, the structure and solid-like properties of the material play a crucial role in product attributes and behaviours. Often the rheology of products for the household, industrial and institutional cleaning market has to be adjusted to fit the needs of each application. Therefore customers find that they often to adjust the rheology of formulations using rheology modifiers.
Rheology modifiers can be used for water-based formulations, as well as oil-based formulations. Water-based formulations are often thickened with standard rheology modifiers like salt or hydrophilic polymers. In oil-based formulations hydrophobic polymers, waxes or inorganic gellants are generally used. The thickening effect of salt is caused by ionic interactions between negatively charged micelles of anionic surfactants and sodium cations of the salt - shown in Figure 1. This effect is strongly dependent on the concentration of salt and anionic surfactants in the formulation.
Rheology modification with hydrophilic polymers is caused by entanglement and electrostatic counteractions which cause the polymers to build 3D-structures. The supramolecular structure influences the rheological properties of the formulation significantly. Thus it is possible to obtain formulations with high viscosity due to gel formation of the polymer. Also an increased stabilisation of particles and hydrophobic oils can be achieved.
Depending on the type of rheology modifier, when the formulation is put under high shear stress it can cause a rapid drop in viscosity - this effect is known as shear thinning and can be observed for our range polymeric rheology modifiers.
Figure 1: Ionic interactions between negatively charged anionic surfactants and sodium cations cause the viscosity of formulations to increase
High Performance Polymeric Rheology Modifiers
Our CrystaSense™ range is made up of high performance polymeric rheology modifiers, for applications in household, industrial and institutional cleaning, as well as air care.
CrystaSense Sapphire is an excellent polymeric thickener for aqueous neutral to alkaline hard surface cleaning formulations. Its shear thinning nature enables targeted delivery of thickened formulations in a sprayable format. The innovative 'Spray & Stick' technology delivers enhanced soil removal due to improved surface contact time - even on vertical surfaces. Therefore cleaning is more effective and convenient, with no streaking or smeary residues left behind and no loss in gloss to treated surfaces.
Figure 2: The shear thinning nature of CrystaSense Sapphire allows the delivery of thickened formulations
Clearly Superior Gellants
Our CrystaSense LP, MP, HP range also displays shear thinning properties and can be used in a wide range of formulation types and formats, including concentrates. These highly versatile polymers can be used with oils and fragrances to formulate visually appealing air fresheners with high fragrance loadings, vibrant gel candles and water-soluble or water-resistant toilet care products.
The CrystaSense LP, MP, HP range also shows compatibility with aqueous systems and can add structure to shear thinning hard surface cleaning formulations, including acidic products, allowing for increased contact time and more controlled application.
Figure 3: CrystaSense gels allow steady and consistent release of fragrances
CrystaSense IM700 and IM800 are novel oil and fragrance gellants, designed to create eye-catching air fresheners for household and automotive usage. These speciality gellants can be used for oil loading of up to 70% and will release fragrance in a steady, consistent manner. They are fully compatible with most common fragrance types, are water and temperature resistant and are therefore suitable for use in a range of different environments. The CrystaSense IM gellants are cold processable, water and temperature resistant, compatible with oil soluble dyes and not limited by shape, therefore creating endless innovative design possibilities.
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