SOLUBLE AND FOAMING BATH OILS
SOLUBLE BATH OILS Composition and Function: Soluble bath oils are either anhydrous concentrates consisting of perfume and surfactant or solubilized products consisting of perfume, surfactant, and water. They are formulated as sparkling, clear products. When added to bath water, they form clear dispersions. Soluble bath oils may contain between 5% to 20% perfume oil. Solubilization of the perfume oil can usually be accomplished easily and economically by means of a hydrophilic surfactant. Formulation: TWEEN(r) and BRIJ(r) surfactants in the HLB range of 12 to 18 are widely used in perfume oil solubilization. ARLASOLVE(r) 200 Liquid/Gel Isoceteth-20 and G-2162 PEG-25 propylene glycol stearate are excellent solubilizers in these formulations. Two to five parts of surfactant will solubilize one part of many perfume oils in water. Formula B-3 exemplifies the use of our surfactant in this type product. By building from this basic formula, and endless variety of soluble bath oils can be formulated.
Preparation: Mix (A) well. Add (B) slowly to (A) with agitation. Filter if necessary.
FOAMING BATH OILS Composition and Function: Foaming bath oils (sometimes referred to as bubble baths) provide both fragrance and foaming action. In addition to being luxury bath items, these products serve the additional esthetic function of eliminating or reducing the soap film that produces bathtub ring. Foaming bath oils are similar to the traditional soluble bath oils with foam builders are: alkyl aryl sulfonates; sodium, potassium, ammonium and alkanolamine lauryl sulfates; and sodium, ammonium and alkanolamine ether sulfates. As foam stabilizers, alkanolamides of coconut fatty acid or of lauric acid are commonly used. Thickeners and sequestrants are sometimes added as minor adjuncts. When additional viscosity is desired, carboxymethyl cellulose, methyl cellulose, and other gums are commonly added. The alkanolamines, when used as foam stabilizers, will also raise viscosity. Foaming detergent bath products require warning labels. The caution statement required by 21 CFR Part 740.17 is; "Caution--Use only as directed. Extensive use or prolonged exposure may cause irritation to skin and urinary tract. Discontinue use if rash, redness or itching occurs. Consult your physician if irritation persists. Keep out of reach of children". Nonionic ethoxylates of alcohols have not been known for their foaming ability, but ARLASOLVE 200 Liquid/Gel Isoceteth-20 has excellent foaming ability which makes it a logical candidate for shampoos, shaving creams and bubble baths. The Ross-Miles test for measuring foam, which uses a very dilute solution of surfactant in water indicates the superiority of ARLASOLVE 200 Liquid/Gel as a foamer. This test does not measure foam quality or density, just the height of the head of foam.
Formulation: In some cases, an emollient such as ARLAMOL(r) E PPG-15 Stearyl Ether can be included in a foaming bath oil formula. Formula B-4 is a clear, viscous liquid which, when added to the bath, readily disperses and still produces a significant amount of foam.
Preparation: Mix all ingredients together with moderate heat and agitation. Formula B-5 illustrates the use of ARLASOLVE 200 Liquid/Gel to solubilize the fragrance in a foaming bath oil. The ratio of surfactant to perfume is dependent on the type of fragrance which is used.
Preparation: Add (B) to (A) with good agitation. Add (C) with stirring, with slight heating to facilitate solution when necessary. Adjust the final product to a pH of less than 7.0 with an acid such as citric. Filter if necessary. |
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