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An Efficient Thickener Available from Rhodia



By Harvey M. Fishman, Consultant



Published November 6, 2012
Related Searches: conditioning soap body spa
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Rhodia Inc., Cranbury, NJ has a product called Rheomer 33 (INCI name: Polyacrylate 33), a milky white liquid with a solid content of 27.5-30.5% which was designed to provide efficient thickening, shear thinning rheology and good suspension properties in low to medium surfactant systems. The ingredient has applications in shampoos, body washes, liquid hand soaps and facial scrubs.
The benefits of this ingredient include:
  • High thickening efficiency in sulfate- based or sulfate-free surfactant systems;
  • Good suspension properties in low to medium surfactants (6 to 13% active surfactants);
  • Superior clarity for pH >6.3 with high tolerance toward salt;
  • Enhanced flash foam and foam volume with high foam whiteness and elasticity;
  • Pleasant in-use feel and clean rinse properties;
  • Good compatibility with cationic polymers; and
  • Liquid form, which makes it suitable for cold processing.
In tests vs. acrylates copolymer, less Rheomer 33 was needed to obtain the same or more viscosity, according to Rhodia researchers.

When formulating with Rheomer 33, the recommended use level is 2-3% active or 6.5-11% as supplied. The recommended pH is 4-11, but for optimal clarity, pH >6.3 is best. Where clarity is not desired, the pH can be adjusted below 6 after neutralizing with an alkaline solution. Suspension properties usually increase below pH 6.

Some suggested products which make use of Rheomer’s suspending ability are a pearlescent body wash with suspended mica, a clear liquid hand soap with emollient capsules, a vegetable oil moisturizing shower gel, and a sulfate free facial wash with exfoliating beads. An example of a body wash follows.

Crystal Clear Exfoliating Body Wash
Ingredients: %Wt.*
Sodium laureth sulfate 5.0
Sodium lauryl sulfate 3.0
Rheomer 33 2.1
Sodium Hydroxide (15%) q.s.
Cocoamidopropylbetaine 1.0
Glycerin 1.0
Kathon CG 0.05
Polyethylene beads q.s.
Water q.s. to 100
*All percentages are given in active weight percent
No heating is necessary.

Another Idea from Rhodia
A companion product to Rheomer 33 could be Miracare SLB (INCI: Water, sodium trideth sulfate, sodium lauryl amphoacetate, cocamide MEA). This surfactant blend allows formulators to suspend high levels of conditioning oils, generate rich, dense foam even in the presence of oil, incorporate high levels of perfumes and essential oils, create lotion-like textures, suspend insoluble actives such as triclosan and incorporate high molecular weight polymers.

The ease of use is stressed because standard equipment can be used, only low shear mixing is needed, no heat is needed, the single surfactant addition produces a flowable liquid, and oils and fragrances can be added anytime during or after the structuring process. Prepare in a three steps by adding water to Miracare ME, add the oil phase, and then add salt and adjust the pH. Mild agitation is needed about 150 rpm. A sample formula follows:

Body Wash
Ingredients: %Wt.
Jaguar C17 0.40
Miracare SLB 40.00
Rapeseed oil 15.30
BHT 0.05
Sodium chloride 3.50
Preservative 0.05
50% citric acid solution(to pH 5.8 to 6.2) 1.00
Water q.s. to 100
   




Email: hrfishman@msn.com

Harvey Fishman has a consulting firm in Wanaque, NJ, specializing in cosmetic formulations and new product ideas, offering tested finished products. He has more than 30 years of experience and has been director of research at Bonat, Nestlé LeMur and Turner Hall. He welcomes descriptive literature from suppliers and bench chemists and others in the field.


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