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Type: Article

Section: Cosmetic Ingredients > Rheology/Thickener

Correlating the Structure and Rheology of Lamellar Liquid Crystalline Phases in Emulsions

This paper describes the correlation between the structure of liquid crystalline phases in emulsions and their rheological characteristics. An oleosome/lipophilic liquid crystalline-forming system and hydrosome/hydrophilic liquid crystalline-forming system were investigated. At the same high shear rate viscosity, the oleosome-system showed less thixotropy and rapid recovery when compared with the hydrosome-system.

Nonaqueous Emulsions: History and Current Specialized Applications

Since the early 1980s, nonaqueous emulsions have attracted technical interest as potential vehicles and delivery systems for personal care products. This is due to the development of a broad range of silicone-based emulsifiers, silicone polymers and other polymeric emulsifiers that have enabled their use. This article will briefly review their history and evolution into current-day specialized applications.

Nonaqueous Emulsions: History and Current Specialized Applications

Since the early 1980s, nonaqueous emulsions have attracted technical interest as potential vehicles and delivery systems for personal care products. This is due to the development of a broad range of silicone-based emulsifiers, silicone polymers and other polymeric emulsifiers that have enabled their use. This article will briefly review their history and evolution into current-day specialized applications.

Bring Food to the Soul of your O/W Emulsion with a Dual Rheology Stabilizing System

Cosmetic emulsions can be stabilized via bulk rheology and interfacial rheology by using a unique synergistic blend of two polysaccharides in a technology derived from the food industry.

A Surfactant/Biopolymer Stabilizer for Emulsions

An emulsifier/biopolymer system using a mixture of nonionic surfactants and two biopolymers was developed. The surfactants provide effective steric stabilization against coalescence, whereas the biopolymers provide a high residual viscosity and yield value, thus providing stability against creaming. The mechanism of stabilization is discussed in terms of the synergy between the two biopolymers.

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Choosing Thickening Agents for Emulsions, Part I: Water Phase Thickeners

As readers of this column certainly must by now know, emulsion stabilization is a favorite topic of mine. A key component of every emulsion is the thickener or, more properly, a thickener system that is employed.

Polymers for Thickening and Aesthetics of Surfactant Systems

In the presented study, researchers suggest that acrylates/aminoacrylates/C10-30 alkyl PEG-20 itaconate copolymer serves to stabilize hydroxypropyl starch phosphate polymer in surfactant systems, and also enables hydroxypropyl starch phosphate polymer to further build viscosity.

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Effect of Perfumes on the Viscosity of Surfactant Systems

It is well-known that perfumes can affect the viscosity of bubble bath or shampoo formulations. Usually they have a thinning effect, but they can also cause a viscosity increase. The effect and its magnitude will vary with perfume type and also with the product formulation. Small changes in the latter can cause large changes in a perfume's effect on the viscosity.

Equilibration Reaction of Silicone Fluids

Silicone compounds resemble organic compounds in their ability to make derivatives, but they are fundamentally different because they are equilibrium products. The nature of the equilibrium and the composition of the equilibrium mixture are the key factors. This is important because cyclic compounds are undesirable in personal care products.

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Minimize drawbacks of conventional natural polymers

Leave behind the typical low viscosity, lumpy textures and stringiness associated with natural leave-on skin and body care. Meet Clariant’s natural rheology modifier Plantasens® Biogum Tara.

Characterization of Multilamellar Vesicles for Cleansing Applications

In the present article, the authors characterize a multilamellar vesicle (MLV) system used in personal care and verify its structure via X-ray scattering, rheology and fluorescence microscopy. This enabled the study of MLV formation to investigate bulk rheology characteristics. The results are presented here as application-relevant properties.

clariant_ct2105-1_lead

Minimize drawbacks of conventional natural polymers

Leave behind the typical low viscosity, lumpy textures and stringiness associated with natural leave-on skin and body care. Meet Clariant’s natural rheology modifier Plantasens® Biogum Tara.

Characterization of Multilamellar Vesicles for Cleansing Applications

In the present article, the authors characterize a multilamellar vesicle (MLV) system used in personal care and verify its structure via X-ray scattering, rheology and fluorescence microscopy. This enabled the study of MLV formation to investigate bulk rheology characteristics. The results are presented here as application-relevant properties.

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Linking Sensory and Rheology Characteristics

The authors introduce a method to use rheological properties (such as dynamic viscosity and yield stress) to describe and predict skin sensory attributes (such as cohesiveness) of cosmetic products. This is a first step in learning to use emulsion structure to predict sensory attributes.

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Addressing Tooth Sensitivity and Dental Erosion

While the introduction of fluoride remarkably increased the life expectancy of natural teeth, two oral care problems have since emerged: tooth sensitivity and dental erosion. This article describes approaches to these problems and discusses the challenge of simultaneously maintaining fluoride efficacy in multi-benefit toothpaste formulations.

Stimuli-responsive Polymer Systems: A Review of Thermo-associative Thickening

This article reviews recent trends in thermally initiated stimuli-responsive materials and provides some insight into the physicochemical mechanisms that underpin this behavior.

Viscosity, Dispersion and More in Mascara

Cosmetic formulators are constantly challenged to develop products for daily use, and mascaras in particular are one of the most researched (and scrutinized) products a woman can purchase. Scientists must go to great lengths to ensure this miracle product delivers on the eyelash benefits it advertises.

Rheological Characterization of a Modified Taurate Acrylic Polymer for Skin Care

The rheology of a pre-neutralized, hydrophobically modified acrylic polymer was investigated by dynamic mechanical measurements using this methodological approach to establish its viscoelastic profile and stability in formulations. Properties of several polymer-containing emulsions were studied and their particle size distribution investigated by laser diffraction.

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