JPS58160381A - Depilatory adhesive sheet - Google Patents

Abstract

PURPOSE:To provide the titled adhesive sheet capable of depilating hair when applied to skin and then peeled off, consisting of a specified thermoplastic elastomer and two or more tackifier resins having good compatibility with the elastomer and different softening points. CONSTITUTION:The depilatory adhesive sheet is prepared from a thermoplastic elastomer having a tensile strength of 10kg/cm or higher and a melt index of 200 or lower (e.g. styrene/isoprene/styrene or styrene/butadiene/styrene block copolymer with a styrene content of 5-45wt%) and at least two tackifier resins having good compatibility with the elastomer and differing from each other in melting point by at least 10 deg.C, one being liquid (including paste) at 25 deg.C and having one hydroxyl gp. in the molecule and another one being solid at 25 deg.C.

Description

[Detailed description of the invention] The present invention relates to an adhesive type hair removal sheet.

The following are known as conventional hair removal materials.

1) Wax type that is solid at room temperature.

2) Cream type containing hair removal agents such as thioglycolic acid.

3) Adhesive type whose main ingredient is pine resin.

However, wax type products (1) have the advantage that hair does not grow for a long time after hair removal because they remove hair from the hair root, but on the other hand, they require a complicated operation of heating during use, and they do not require measurement of the melting temperature. The cream type (2) has the advantage of being easy to remove, but has the disadvantage that hair grows in a short period of time because the hair root is not removed.

In addition, the adhesive type (3) has the disadvantage that the hair removal rate varies widely depending on the outside temperature since it is mainly composed of pine resin.

Recently, an adhesive type product consisting of four components, a thermoplastic nidistomer, a tackifying resin, butyl rubber, and a liquid polymer, has been proposed. There was the inconvenience of not being able to expect anything.

The present invention provides a novel adhesive hair removal sheet that solves the drawbacks of the prior art, and its gist is that it has a tensile strength of at least 0.01 cg/Qm'' and a melt index of 200 or less. The constituent components are a thermoplastic elastomer and a tackifying resin that has good compatibility with the elastomer, and the resin is composed of two or more types with softening points different by at least 10°C, and one resin is liquefied at 25°C. It is to be.

The adhesive hair removal sheet of the present invention has the convenience of being able to remove hair from the hair root by adhering it to the skin surface and then forcibly peeling it off. The thermoplastic nidistomer used in the implementation of the present invention, which has the following characteristics, is used to improve the physical strength of the adhesive hair removal sheet of the present invention and to solve the dispersion in properties. An elastomer is used which preferably accounts for 30% or less of the total components (by weight) and yet has specific physical properties that can sufficiently achieve the above objectives.

-] 20 Elastomers that can achieve these objectives include thermoplastic elastomers with a tensile strength of at least 10 kg//c, B' and a melt index of 200 or less, typical examples being It is a styrene-inbrene-styrene or hastyrene-butadiS-styrene block copolymer having a styrene content of 5 to 45% by weight. Other thermoplastic elastomers that can be used include ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, transisoprene, and the like.

Tensile strength of thermoplastic elastomers ASTM D 41
2) is less than 10 kg/m', which is not preferable because the adhesive hair removal sheet has to be made thin in order to adhere closely to the shape of the skin surface, and is likely to break when it is peeled off from the skin surface; If the temperature is higher than 200F, the fluidity may be too high when heating and melting to form a film during production, resulting in uneven thickness, unnecessary adhesion to the skin surface, or the adhesive layer may flow during storage. This is undesirable because so-called glue oozes out.

In addition to having good compatibility with the elastomer, the tackifying resin blended into such a specific thermoplastic elastomer must also satisfy the following two conditions.

One of them is that the tackifying resin is selected from two or more systems,
The difference is that the softening point is at least 10℃, preferably 25℃
The other is that one of the two or more systems is 25
It is liquid at ℃.

If the difference in the softening points of the resins selected from two or more systems is less than 10°C, it is difficult to maintain a balance between cohesive force and adhesive force, which is undesirable because, for example, adhesive remains on the skin surface. .

The tackifier resin, which is liquid (including paste) at 25°C, imparts flexibility to the adhesive hair removal sheet at low temperatures and improves its adhesion to the skin.
Xylene S resin, which is liquid at 5℃, terpene resin,
Examples include rosin-based resins such as rosin methyl ester, hydrogenated rosin methyl ester, rosin triethylene glycol ester, hydrogenated rosin triethylene glycol ester, and syn/ethylene glycol ester. According to experiments, rosinnisder is treated with metallic sodium and alcohol to reduce the ester and form an alcoholic hydroxyl group.
It has been found that a liquid resin having one OH group in the molecule (containing 14 to 23 weight percent dehydroalcohol, 36 to 39 weight percent dihydroalcohol, and 38 to 50 weight percent tetrahydroalcohol) can be suitably used. ing. As a representative example of such a liquid resin having one OH group, one commercially available from Percules (USA) under the trade name Avitol is suitable.

The other tackifying resin used together with the liquid resin is one that is solid at 25°C and improves adhesion to hair, such as gum rosin, wood rosin, and dammar whose softening 7Q is 50°C or higher. Natural resins such as polymerized rosin, partially hydrogenated rosin, glycerin ester rosin, modified rosin such as pentaerythnotoester rosin, and derivatives thereof, terpene resin, xylene resin, petroleum resin, and the like. It is desirable that the softening point of the resin be within the range of 50 DEG C. to 180 DEG C. in order to prevent the adhesive from remaining on the skin surface and to prevent the adhesive strength from decreasing at low temperatures.

In these thermoplastic elastomers, the proportions of tackifying resin that is liquid at 25°C and tackifying resin that is solid at 25°C are:
20 to 2 parts of liquid resin per 100 parts by weight of elastomer
00 parts by weight, 70 to 150 parts by weight of a suitable material, and 50 to 400 parts by weight of solid resin, preferably 1'td: 1.00
-300 parts by weight.

If the liquid resin is less than 20 parts by weight, it will lack flexibility at low temperatures and adhesion to the skin, and if it is more than 200 parts by weight, the flexibility will increase and the adhesion to the skin will be good, but the cohesive force will decrease, The balance with the adhesion to hair is lost, and adhesive residue is produced, making it unsuitable for use in trenches. If the solid resin is less than 50 parts by weight, the adhesion to the hair will be reduced, making it impossible to completely remove the hair, while if it is more than 400 parts by weight, the adhesion to the hair will be better, but the balance with the skin adhesion will be disrupted and hair will be removed from the root. This is undesirable because it makes it difficult to do so, leads to a decrease in cohesive force, and causes adhesive residue.

Appropriate amounts of compounding agents such as coloring agents, fillers, antioxidants, anti-aging agents, stabilizers, fragrances, local anesthetics, and anti-inflammatory analgesics may be added to these three components as necessary. Can be done.

The uniformly dispersed mixture designed in this way can be extruded,
It is formed into a film or sheet with a thickness of about 50 to 800 ttm using commonly known film-forming means such as rolling or casting, and is used as an adhesive hair removal sheet.

Note that a reinforcing support such as a thin non-woven fabric, cloth, paper, or plastic film can be interposed or fixed to the core between the layers or on one surface.The adhesive hair removal sheet of the present invention is constructed as described above. By applying this to the skin and forcibly pulling it off, you can reliably remove hair from the hair root, and since the three main ingredients have good compatibility, a thin film can provide sufficient hair removal effect. It has the characteristic that it can be obtained.

Examples of the present invention will be shown below. The term ``bunchubu'' means ``ju'' (part).

Example Samples 1 to 5 were prepared using the following formulation examples 1 to 5, and a hair removal test was conducted using 10 adult male and female panelists.The results are shown in Table 1. be.

The sample was prepared by first mixing the thermoplastic elastomer in the formulation example, liquid resin, and stabilizer, melting and stirring at 120°C for 30 minutes, then adding the solid resin and melting and stirring at 120°C for another 20 minutes. The resulting molten mixture was applied to a thickness of 150 μm on a 25 μm thick polyester film as a reinforcing support.

Formulation Example I S-Knee 8 20 parts (styrene-isoprene-sterene telepronochloride elastomer, average molecular weight [125,000, styrene/isoprene ratio -14/
86, tensile strength 218 kg/cm', melt index 10 i+/min) Hydrogenated rosin glycerin ester 30 parts (desire point 85°C) Hydrogenated rosin triethylene glycol 30 parts (viscosity 3
8000 centipoise at 25°C) Formulation Example 2 S-Knee S (same as Formulation Example 1) 20 parts Hydrogenated rosin 35 parts (hydrogenated rosin, softening point 75°C) Liquid resin (manufactured by Vercules, USA, trade name: Avitol)
20 parts Alkylated bisphenol 1.59 parts Combination Example 3 S-I-s (same as Formulation Example 1) 25 parts Hydrogenated rosin (same as Formulation Example 1) 30 parts Liquid resin (same as Formulation Example 2) 25 parts Hydrogenated p-zine methyl ester 109 (2300-6600 centipoise (25°C)) alkylated bisphenol
1. ．． 5 parts Blend example 4 S-B-820 parts (styrene-butadiene-styrene radial teleprosoque elastomer, average molecular II 150000, styrene/butadiene ratio -30770, tensile strength 265 kg
7am', melt index 1 or less) hydrogenated rosin (
Same as Formulation Example 1) 55 parts Liquid resin (same as Formulation Example 2) 30 parts Alkylated Bisphenol 15 parts Formulation Example 5 s-x-s (same as Formulation Example 1) 20 parts Hydrogenated rosin glycerin ester 20 parts ( Same as formulation example 1) Liquid resin (same as formulation example 2) 30 parts alkylated bisphenol 1.5 parts 1st
Table (Removal rate) Test method A sample is made into a sample body with a size of 5 cm x 13 cm and a paper of 5 cm x 3 cm is pasted to one end in the length direction to form a knob.

Next, this sample body is adhered to the test site so that the knob is located in the direction of hair flow, and then the sample is removed by holding the knob and rapidly peeling off in the opposite direction to the direction of hair flow.

The hair removal rate was determined by the following formula by comparing the hair removed from the test site and the hair remaining at -2 in the trace of the test site.

It can be seen that the adhesive hair removal sheet of the present invention has a remarkable hair removal effect, as is clear from the above examples.

patent applicant Nitto Electric Industry Co., Ltd. Representative Sanbe Hijikata

Claims (1)

[Scope of Claims] (1) A thermoplastic elastomer having a tensile strength of at least 10 kQAm' and a melt index of 200 or less, and a tackifying resin having good compatibility with the elastomer, and the resin is at least Softening point is 10℃
An adhesive hair removal sheet comprising two or more different resins, one of which is liquid at 25°C. 2) The adhesive hair removal sheet according to claim 1, wherein the tackifying resin that is liquid at 25° C. has one OH group in the molecule.