Solid cleansing bar

Details Solid cleansing bar Solid cleansing bar

1994-08-08

1996-06-04

Therkorn, Linda Skaling

Compositions

Water-softening or purifying or scale-inhibiting agents

252174, 252DIG16, 252DIG2, 25217423, 252542, 252546, C11D 188, C11D 320

Patent

active

055230172

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a solid cleansing bar in particular a bar for use as a shampoo bar, a moisturizing bar, a shaving bar and detergent based products generally.
Shampoos and personal care detergent products are generally provided in a liquid form. The shampoos are usually packaged in containers such as plastic bottles or sachets. Leakage can occur due to damage to the containers or failure to replace the lid effectively. Sachets are particularly prone to this leakage difficulty. Further, in use bottles of shampoo are regularly knocked or fall over when opened causing considerable wastage and causing the surfaces of baths and shower trays to become dangerously slippery. Furthermore, when the shampoo is finished, the container is discarded leading to a waste in material resources and adverse environmental effects.
Another disadvantage of liquid shampoo preparations is that it is difficult to control the amount of shampoo applied to a particular area.
Similar comments apply to other similar cleansing compositions.
This invention is directed towards providing an approved cleansing bar which will overcome at least some of these difficulties.
CH-A-561 774 describes an iodine-containing pharmaceutical cleansing germicidal bar comprising polyoxyethylene glycols with a molecular weight of from 1,540 to 6,000, a primary alkanol, a detergent and an iodophor.
Patent Abstracts of Japan Vol 11, No. 139 (C-420) 1986 and JP-A-61277608 describes a perfumed solid product for showering including polyethylene glycol having an average molecular weight of from 1,000 to 6,000.
According to the invention there is provided a solid cleansing bar comprising average molecular weight of between 6,500 and 8,500.
In a preferred embodiment of the invention the composition has a melting point of greater than 40.degree. C.
In a preferred embodiment of the invention the polyethylene glycol base system is present in an amount of between 65% and 85% by weight, most preferably between 70% and 80% by weight.
In one arrangement the polyethylene glycol base system comprises at least two polyethylene glycols of different molecular weights. Typically one polyethylene glycol has a molecular weight of approximately 8,000.
In one arrangement the polyethylene glycol having a molecular weight of approximately 6,000 is present in an amount of from 30% to 45% by weight of composition.
In one embodiment of the invention, the polyethylene glycol base system includes a softening polyethylene glycol having a molecular weight of between 100 and 800.
Preferably the softening polyethylene glycol has a molecular weight of 400. Most preferably the composition includes from 1% to 8%, most preferably from 3% to 7% by weight of the softening polyethylene glycol.
In a particularly preferred embodiment to the invention, the pH of a 1% solution of the composition in water is from 5.5 to 8.0, most preferably between 6.0 and 7.0.
In an especially preferred embodiment to the invention, the melting point of the cleansing bar is from 43.degree. C. to 46.degree. C.
In a particularly preferred embodiment of the invention the detergent comprises from 8% to 30% by weight of the composition. Most preferably the detergent comprises from 12% to 20% by weight of the composition.
In one arrangement the detergent includes an anionic surfactant.
In another arrangement the detergent includes an amphoteric surfactant.
In an especially preferred embodiment of the invention the detergent is formed by a detergent system comprising at least two detergents.
The anionic surfactant may preferably comprise a lauryl sulfate.
The amphoteric surfactant may preferably comprise an imidazoline.
In one particularly preferred arrangement the detergent comprises a mixture of a lauryl sulfate and an imidazoline.
In a particularly preferred embodiment the invention the composition includes up to 12% by weight of coactive ingredients. These may be selected from one or more of foam stabilizers, pearling agents, emollients, thickeners, wetting agents, superfatting agents, water binders, waxes, skin toni

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