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Rheology/Viscosity Modifier
New in Rheology/Viscosity Modifier (page 8 of 9)
Dec 23, 2005 | 02:38 PM CST
Thickening Toothpaste Formulations
By: Roger E. Stier, Ph.D., Noville, Inc.
The combined knowledge of rheology and chemistry of binders together with the art of proper formulation leads to the production of aesthetically pleasing dentifrice formulations.
Dec 13, 2005 | 11:21 PM CST
Hydrolysis-Resistant Esters
By: John A. Imperante, Phoenix Chemical
Hydrolytic instability of esters in cosmetic products can be reduced, compared to that of standard straight chain esters, by using non-hydrolyzable esters synthesized from a diol reaction sequence. Two commercial dimer diol di-esters, given as examples, enable stable formulations at extremes of pH.
Dec 13, 2005 | 10:33 PM CST
Linking Sensory and Rheology Characteristics
By: Vincent A.L. Wortel, Cornelis Verboom, Johann …
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.
Aug 03, 2005 | 01:23 PM CDT
A Surfactant/Biopolymer Stabilizer for Emulsions
By: T. Tadros, Wokingham; S. Leonard and M.-C. Tae…
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.
Jul 25, 2005 | 01:01 PM CDT
Advances in Polymers for Hair Coloring
By: R.Y. Lochhead, The University of Southern Miss…
This article surveys patents and technical literature, principally from the past 10 years, to report advances in polymers used for dyeing hair, color retention,and hair lightening. Associative thickeners (anionic, cationic, amphoteric, nonionic, HASE, HEUR), nonassociative thickeners, and silicones are discussed.
May 06, 2003 | 02:00 AM CDT
Cationic Emulsifiers: A Most Underutilized Category
By: Ken Klein
Cosmetic chemists have at their disposal a seemingly endless supply of emulsifiers from which to choose. By far, the most popular category of emulsifiers is “soap"–the reaction product between a fatty acid typically stearic acid) and an alkali earth metal (typically sodium hydroxide, occasionally potassium hydroxide).
May 06, 2003 | 02:00 AM CDT
Chitosan in Cosmetics: Technical Aspects when Formulating
By: Christina Juneau, Atrium Biotechnologies; and …
A high-grade chitosan made from shrimp shells has viscosity-building properties that support its use in cosmetic emulsions and gels.
May 06, 2003 | 02:00 AM CDT
Selecting the Right Emollient Ester
By: Patrick Obukowho and Barbara Woldin, Croda Inc…
Formulating tips and representative formulas are presented to help the formulating chemist select the appropriate emollient esters for use as pigment wetting agents in various types of makeup systems, such as foundations and lipsticks.
May 06, 2003 | 02:00 AM CDT
New Cellulose Derivatives in Personal Care Formulations
By: K Bergstrom, A Busk and I Johansson, Akzo Nobe…
Hydrophobic modified cellulose ethers can be used to thicken formulations containing high concentrations of anionic surfactants by adding nonionic surfactants to the system. Implications are shown for liquid soaps and hair shampoos.
May 06, 2003 | 02:00 AM CDT
How Do I Thicken my Cosmetic Formula
By: Dennis Laba, Elementis Specialties
This article explains how to select a thickener from nine basic thickener groups that enable the chemist to change a product's viscosity and rheological properties, such as stability, feel and flow.