JPS5851993B2 - Rapidly dissolving solid shampoo - Google Patents

Description

[Detailed description of the invention] The present invention relates to fast-dissolving solid shampoos.

Shampoos are categorized by shape: clear liquid, emulsion,
It can be divided into two-layer liquid, cream, gel, paste, powder, solid, etc.

Most of the shampoos currently on the market are liquid shampoos.

However, since approximately 80 yen of the liquid shampoo's ingredients are water, the volume and weight of the product increases, and since a sturdy container made of gold or resin is used, container costs and transportation costs account for a large proportion of the product price. , which also goes against resource conservation.

In order to avoid such waste, it is preferable to use solid shampoos, but conventional solid shampoos have poor solubility and do not completely dissolve even if left in water for 2 to 3 days.

For this reason, liquid shampoos foam immediately when applied to the hair, whereas solid shampoos foam slowly and give the feeling that it takes a long time to wash the hair.

In addition, powdered shampoos tend to spill when used, resulting in a lot of waste, and solid shampoos give the impression of leftover soap, which is not suitable for the tastes of consumers who are used to liquid shampoos.

In order to improve these drawbacks, solid shampoos are preferred, which dissolve quickly in water and can be used after being liquefied before washing the hair.

In order to develop a fast-dissolving solid shampoo, the present inventors manufactured tablets consisting of sodium lauryl sulfate, which is the main cleaning agent of shampoo, as well as cleaning aids, emollients, thickeners, and bulking agents. A tablet dissolution rate test was conducted.

The test was conducted by standing one tablet in 20 Trill of water at 50 to 60°C and measuring the time until it completely dissolved.

As a result, a tablet consisting of only 2 g of sodium lauryl sulfate completely dissolved in about 50 minutes, whereas a tablet consisting of 2 g of sodium lauryl sulfate and 0.5 g of each of the above ingredients dissolved at a faster rate, contrary to expectations. It was found that it took more than 60 minutes to completely dissolve.

Therefore, in order to enable tablets to dissolve within 30 minutes, preferably within a few minutes, the present inventors conducted further research in search of an appropriate auxiliary agent, and as a result, urea was found to have a remarkable effect as a dissolution promoter. I discovered that it can be played.

It has not been reported in the literature that urea could be added to this type of product to promote dissolution.

The present invention is based on this knowledge and is a fast-dissolving solid shampoo characterized by containing urea in admixture with a detergent.

Solid shampoo refers to shampoo in the form of granules, powder, solid, etc.

The solid shampoo may have any shape such as cubic, rectangular parallelepiped, spherical, or cylindrical, but in order to dissolve quickly, a shape with a large surface area such as a tablet is preferable.

Note that powders, granules, etc. can be packaged in any amount, but if they are solid, it is convenient to use them if they are shaped so that one piece corresponds to the amount used at one time or half thereof.

When producing the solid shampoo of the present invention, urea and a main cleaning agent are uniformly mixed together with cleaning aids, emollients, thickeners, bulking agents, etc., if desired.

This powder can be made into desired shapes such as granules and tablets by conventional methods.

The urea used in the present invention may be commercially available urea, and main cleaning agents include, for example, alkyl sulfates, preferably sodium lauryl sulfate, alkyl ether sulfates, soaps, amphoteric surfactants, and cleaning aids include, for example, sucrose fatty acid esters,
Coconut oil fatty acid monoethanolamide, lauric acid monoethanolamide, etc. are used alone or in combination.

Examples of emollients include sorbitol, mannitol, lactose or glucose; thickeners include sodium alginate, propylene glycol alginate, ethylcellulose, carboxyvinyl polymer, sodium carboxymethylcellulose, *gum tragacanth, gum arabic, hydroxypropylcellulose, hydroxypropylmethylcellulose , hydroxyethylcellulose, polyvinyl alcohol methylerulose, and as fillers, for example, sodium sulfate, sodium chloride, ammonium chloride, sodium phosphate, sodium tripolyphosphate, ammonium phosphate, ethylenediaminetetraacetate, soluble starch, etc. are used.

The amount of urea used in the solid shampoo of the present invention is in a weight ratio of 0.1 to 5, preferably 0.5 to 3, particularly 0.8 to 2, relative to the main cleaning agent.

For example, the results of measuring the dissolution rate of tablets that use sodium lauryl sulfate as the main cleaning agent and only urea (addition of other auxiliaries will speed up dissolution) with various compositions are shown in the table below. That's right.

Since the solid shampoo of the present invention is easy to package and lightweight, the container cost, transportation cost, etc. are lower than that of liquid shampoo, and it is convenient to carry.

In addition, since it dissolves quickly in water, it is easy to use in liquid form, and even when applied to hair as a solid, it immediately dissolves and foams, thus meeting the preferences of consumers accustomed to liquid shampoos.

Example 1 Sodium lauryl sulfate 40.9 urea
409 Sorbitsu
20g hydroxypropyl methylcellulose 5g fragrance
0.5g preservative
Appropriate amount of pigment Appropriate amount of the above ingredients are mixed uniformly and sieved through a 50 mesh sieve to form a tablet shampoo weighing 5 g per tablet.

When this tablet is left in 20 ml of cold water or hot water below 45°C, it completely dissolves in about 10 minutes.

Example 2 Sodium lauryl sulfate 40g Sucrose fatty acid ester 2.5g Urea
20g lactose
17.59 Polyvinyl pyrrolidone
2.5g Sodium bicarbonate 15g
Citric acid 5g fragrance
0.5g preservative
Appropriate amount of pigment
Appropriate amounts of the above ingredients are mixed uniformly and sieved through a 50-mesh sieve to form tablets each weighing 4 g.

When this tablet is left in 20 ml of warm water at 50 to 60°C, it completely dissolves in about 20 minutes.

Example 3 Sodium lauryl sulfate 40g urea
61 sorbit
20g hydroxypropyl methylcellulose 5g coconut oil fatty acid jetanolamide
10g ethanol 10g fragrance 0.25g preservative
Appropriate amounts of sodium lauryl sulfate, urea, sorbitol, hydroxypropyl methylcellulose, fragrance and preservatives are mixed uniformly and sieved through a 50 mesh sieve.

Separately, coconut oil fatty acid jetanolamide is added to ethanol, heated to about 50°C to completely dissolve, and then the above mixture is gradually added to form granules.

Further, a portion of the granules are made into tablets each weighing 6 g. 6g of this granule
Alternatively, if one tablet is left in 2 ounces of warm water at 40-50'C, it will completely dissolve in about 20 minutes.

Comparative example 1 Sodium lauryl sulfate 40g sorbitol
20g hydroxypropyl methylcellulose 5g coconut oil fatty acid monoethanolamide 10g disodium hydrogen phosphate
20g fragrance and preservative Appropriate amount The above ingredients are mixed uniformly and sieved through a 50 mesh sieve to form a tablet shampoo weighing 4.75g per tablet.

This tablet is to be compared with Example 3, and when it is similarly left in 201 nl of warm water, the coconut oil fatty acid monoethanolamide remains undissolved even after 24 hours.

Comparative example 2 Sodium lauryl sulfate 40g sorbitol
20g Hydroxypropyl methylcellulose 5g Sodium hydrogen phosphate 20g Flavoring and preservatives
Appropriate amounts of the above ingredients are uniformly mixed and sieved through a 50-mesh sieve to form tablet shampoos weighing 4.25 g each.

When this tablet is left in 20 ml of cold water or hot water below 45°C, it takes 2.5 hours to completely dissolve.

Even if coconut oil fatty acid monoethanolamide is removed in this way, it still takes a long time to dissolve.

Claims (1)

[Claims] 1. A fast-dissolving solid shampoo characterized by containing urea in admixture with a detergent.