CS238790B1 - Foaming aerosole preparations - Google Patents

Abstract

The method addresses new aerosol foams preparations in which the liquid phase is in the form the emulsion contains hydrophilic colloids and at filling only one container propellant, namely dichlorodifluoromethane.

Description

(54) Foam aerosol preparations

The method solves new aerosol foam formulations in which the liquid phase in the form of an emulsion contains hydrophilic colloids and only one propellant gas, dichlorodifluoromethane, is used in the containers.

Aerosol foam formulations, such as shaving foams, foam masks and the like, are formulations typically formed by various combinations of aqueous active substance emulsions and propellants. For foam preparations, dichlorodifluoromethane (propellant 12) and dichlorotetrafluoroethane (propellant 114) in a 1: 1 mixture are used as propellants. When using propellant gas 12 alone, the quality of the foam is not satisfactory, as the foam is gradually removed from the aerosol can, the foam tends to thin and has less strength.

Little attention has been paid to aerosol foam, as a relatively unstable multiphase system. Their quality is influenced in particular by the following factors: the composition of the liquid phase (emulsion), the composition of the propellants used and the ratio of the liquid phase to the propellants. The quality of aerosol foams is usually assessed in terms of foam density and foam stability, using simple maintenance methods for these features. We consider rheological methods considerably more advantageous.

The study of available literature has revealed that the rheology of aerosol foams has not been studied in detail yet. Only Richman MD and Shangraw RF: Aerosol Aga 11.28 (1966) used a viscometer with coaxial cylinders, which seems less suitable for this purpose. Based on our own experience gained in the study of rheological properties of a number of cosmetic products, we used the rotational viscosimetric method to evaluate the practical properties of aerosol foams. This method has a number of advantages over previously used methods, especially the determination speed, accuracy and reproducibility of the results. For evaluation, a Ferranti-Shirley rotary viscometer with a cone-plate arrangement with automatic flow curve registration was preferably used. The value of the apparent viscosity determined at low shear rates (up to 1o " s ") represents the weight of the foam; the stability of the foam can be assessed by measuring at high shear rates / of the order of γ = 10 ^ s " In addition, the static flow limit can be considered a measure of _Λ ρβνηο8ΐ1 foam.

The principle of the invention, verified by the above methods, is novel formulations of aerosol foam formulations, characterized in that the liquid phase (emulsion) contains hydrophilic colloids and only propellant gas is used for filling into containers.

Suitable hydrophilic colloids are, for example, polyvinyl alcohol, carboxyvinylpolymer, carboxymethylcellulose, salts of alginic acid, tragacanth, hydroxyethylcellulose and others.

With the set of measurements it was verified that the apparent viscosity values of hydrophilic colloid-free aerosol foams filled with 12/114 1: 1 gas mixtures reached values of 2.0 to

2.4 Pa s / at? = 66.7 s ^-1 and 25 ° C / and stability values = 1,000 to 1,600 s -1 / 25 Analogous formulas filled only with propellant gas 12 have an apparent foam viscosity ^J C.

1.16 to 1.25 Pa s at

66.7 a ^] /

C and foam stability do-y = 1000 s

Foam aerosol formulations according to the invention comprising a liquid phase hydrophilic colloid showed an apparent viscosity of from 2.5 to 2.6 Pa · s / with "^" = 66.7 s "'/ 25 ° C and a foam stability of 1 200 1 600 s ^- '.

Thus, it can be seen that by appropriately adjusting the liquid phase composition of the foam formulation, the same properties can be achieved without the use of a mixture of gases 12 and 114.

The invention is illustrated in more detail by the following examples without being limited thereto.

Example 1

Aerosol shaving foam:

mixture of fatty acids j4 ~ ^{c c} iq exyetylovaný fatty alcohol / 16EO / 9.0 g 1.5 g glycerine 5.0 g alkylamidobetaine 5.0 g hydroxyethylcellulose 0.7 g triethanolamine 100% 7,0 g fragrant composition o, 8 g distilled water 71,0 g

The individual weighed components, in addition to the mixture of fatty acids and fragrance composition, are gradually dissolved in distilled water and heated to 70-80 ° C. To this mixture is added, while stirring, a 70-80 ° C hot molten mixture of fatty acids and stirred with cooling to 20 ° C. A fragrance composition is added at 35 ° C.

Weigh 144 g of the prepared liquid phase into the 210 ml aerosol container, insert the aerosol valve and close. 16 g of propellant gas 12 are metered through the valve.

Example 2

Aerosol shaving foam:

fatty acid mixture ^C 14 ^1C , 8 ⁷ - ⁵ «coconut oil 2.5 g lanolin 1.2 g glycerine 7.0 g polyvinyl alcohol / 17% solution / 1.0 g alkylamidobetaine 11.0 g triethanolamine 100% 6.7 g Aromatic composition 0.8 g distilled water 62.0 g

The first three components are mixed, melted at 70-80 ° C and slowly added to the mixture of other materials heated to 70-80 ° C with stirring. Stirring is maintained at 20 ° C while cooling, the fragrance composition is added at 35 ° C.

The filling in the aerosol can is the same as in Example 1.

Example 3

Nourishing foam mask in aerosol:

mixed emulsifier 3.0 g 2-octyldodecanol 2.0 g paraffin oil 10.0 g vegetable oil 10.0 g vitamin A, E, D ^, F mixture 0.7 g glycerin 5.0 g fragrance composition 0.5 g hydroxyethylcellulose 0.2 g distilled water 68.6 g

The first five components are melted at 70-80 ° C and added to the mixture of the remaining components heated to 70-80 ° C with stirring. The mixture was stirred to 20 ° C, the fragrance composition was added at 35 ° C. Filling into aerosol containers as in Example 1

The application of the formulations according to the invention brings a number of advantages, in particular simplification of handling in warehouse management, where fewer propellant gas storage tanks are required, and further reduced production costs, since propellant 12 is cheaper than propellant 114.

Claims (1)

object of the invention Foam aerosol formulations, characterized in that they contain from 0.1 to 1 wt. % of hydrophilic colloid e propellant dichlorodifluoromethane.