JPH04343811A - Adhesive pad material for facial care - Google Patents

Abstract

PURPOSE:To satisfy such elements of a pad material for facial care as a frequently repeated sticking property, safety for human bodies, easy handling, cleanliness and the like, in the pad material being used in such a way that the aged keratin, unremoved makeup and dirt on the skin of a face of the like are stuck thereto and peeled. CONSTITUTION:A sheet-shaped base 32 is embedded in or fitted to the surface of an urethane adhesive 31 having polypropylene grycole and polyethylene grycole as segment chains.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facial adhesive pad material, particularly to a facial adhesive pad material used to remove makeup residue after washing the face and aging dead skin cells on the skin surface.

0002

[Prior Art] For example, a pack agent is a cosmetic product that has been used for a long time.A liquid pack agent is applied to the skin surface such as the face, and the pack agent hardens into a thin film and is peeled off from the skin surface. method was being done. In this method, dead skin cells, makeup residue, dirt, etc. on the skin surface are attached to a thin film pack agent and removed from the skin surface. However, it takes a considerable amount of time to harden and is expensive.
For these reasons, it cannot be carried out very often, and the container is heavy and bulky, making it inconvenient to carry. In addition, there are cleansing creams that are commonly used to remove makeup, and facial cleansers that contain ingredients that remove dead skin cells, but they are both less convenient and less effective. was.

On the other hand, by holding an adhesive on a sheet-like base material,
By protecting the adhesive base material and release paper, it forms a lightweight and non-bulky adhesive pad for facial beauty.When necessary, the release paper is peeled off and the adhesive is pressed onto the face, etc. to remove dead skin cells. A countermeasure was devised to remove makeup residue, dirt, etc. by attaching it to an adhesive. In fact, there are also small makeup pressers on the market, each measuring a few centimeters square, to prevent makeup from fading.

By the way, when obtaining the above-mentioned facial adhesive pad that can withstand actual use, the first question is what ingredients and properties are suitable for the adhesive. Another problem is to develop an appropriate mode for retaining the adhesive on the sheet-like base material. In other words, facial adhesive pads are used by frequently and repeatedly pressing the adhesive against uneven areas such as wrinkles on the skin, so they need to be non-toxic to the human body and capable of being repeatedly applied repeatedly. In addition to this, it is also required to have excellent adhesion and familiarity to the skin. Furthermore, there are various demands such that the adhesive does not stick to the skin or hands and is aesthetically hygienic.

The following several types of polymeric adhesive substances are known as adhesives used for medical purposes.

One of these is natural polymeric polysaccharide gums such as gum karaya. This type of polysaccharide gum has good adhesion and adhesion to the skin and is highly safe for the human body, so it has been widely used as a medical adhesive. However, polysaccharide gums absorb sweat from the human body, resulting in early loss of adhesive strength, cannot respond well to pH changes, are more likely to cause skin allergies when applied for a long period of time, and bacteria can be generated when stored for a long period of time. Due to problems such as ease of use, it is now used very rarely.

Another type of hydrogel is a hydrogel made of a highly water-absorbing or hygroscopic resin such as acrylic acid (salt) grafted starch or modified polyvinyl alcohol, or a hydrogel such as polyhydroxyethyl methacrylate (HEMA). These polymers are generally obtained by polymerization of monomers. However, these hydrogels are essentially water-containing gels that develop adhesive strength when they contain a large amount of water, and their adhesiveness is not sufficient to remove dead skin cells and dirt from the skin. be. Moreover, the adhesiveness disappears when the water evaporates as it dries, so it cannot be said to be truly practical. On the other hand, acrylic polymers, which have been widely used in recent years, have a strong adhesive force and can withstand repeated use to some extent, but if the adhesive force is too strong, the surface of the adhesive layer is likely to get dirty with dead skin cells peeled off from the skin, and this dirt can cause the adhesive to become sticky. Because it easily disappears, it cannot withstand frequent repeated use. In addition to the toxicity of residual monomers to the human body, another problem is that when monomers are retained on the surface of a substrate such as cloth, foam, or plastic and polymerized, the substrate is likely to be attacked.

[0008] Still another one is that the present applicant filed a patent application in 1983.
This is a urethane adhesive that has already been proposed in No. 281407. This type of urethane adhesive is safe, has no toxicity to the human body, has excellent adhesive strength, and can withstand long-term storage, and is used for various purposes as a medical adhesive.

[0009]

[Problems to be Solved by the Invention] The present invention was made under the above circumstances, and provides a facial adhesive pad material that can easily remove makeup residue and aging dead skin cells after washing the face and is convenient to carry. It is about providing. Furthermore, facial adhesives that not only satisfy the various properties required for actual use such as adhesive performance and safety for the human body, but also sufficiently satisfy auxiliary factors such as ease of handling and cleanliness. The purpose is to provide pad materials.

0010

[Means for Solving the Problems] The facial adhesive pad material of the present invention is obtained by embedding a sheet-like base material inside or installing it on the surface of a urethane adhesive having polypropylene glycol and polyethylene glycol as segment chains. can get.

[0011] The urethane pressure-sensitive adhesive having polypropylene glycol and polyethylene glycol as segment chains used in the present invention may be made of, for example, polyol components A to D and polyisocyanate components E to I of the following structural formulas, each used alone or in combination. do. These prepolymers have a functional group of -OH group or -NCO group, and this functional group reacts to form a sticky interstitial (In
A segmented polyurethane (terpenetrated network) is formed.

0012

[Chemical formula 1]

R1 and R2 are either an alkyl compound, an alicyclic compound or an aromatic compound, and AO is an alkylene oxide chain.

[0014]

[Case 2]

AO is an alkylene oxide chain, and l is an integer of 1 or 4.

[0016]

[Chemical formula 3]

AO is an alkylene oxide chain.

[0018]

[C4]

AO is an alkylene oxide chain, R
is a hydrogen atom, an alkyl compound, an alicyclic compound, or an aromatic compound.

[0020]

[C5]

R is an alkyl group, an alicyclic compound or an aromatic compound, and AO is an alkylene oxide chain.

[0022]

[C6]

R is an alkyl group, an alicyclic compound, or an aromatic compound, and AO is an alkylene oxide chain.

[0024]

[C7]

R is an alkyl group, an alicyclic compound or an aromatic compound, AO is an alkylene oxide chain, and l is an integer of 1 or 4.

[0026]

[Chemical formula 8]

R is an alkyl group, an alicyclic compound, or an aromatic compound, and AO is an alkylene oxide chain.

[0028]

[Chemical formula 9]

R is an alkyl group, an alicyclic compound, or an aromatic compound, and AO is an alkylene oxide chain.

[0030] Here, the prepolymers as polyol components shown in structural formulas A to D will be described.

Structure A is a polyurethane polyol prepolymer which is a reaction product of a polyether polyol and a diisocyanate. Both terminal components consist of polyether polyol, and the terminals are -OH groups. The diisocyanate compounds used here are the same as those in the polyurethane polyisocyanate prepolymers described below. For example, phenylene diisocyanate, 2,4-toluylene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), naphthalene 1,5-diisocyanate, hexamethylene diisocyanate (HMDI), tetramethylene diisocyanate (TMDI), lysine diisocyanate, Xylylene diisocyanate (XDI), water-added TDI, hydrogenated MD
I, dicyclohexyldimethylmethane p,p'-diisocyanate, diethyl fumarate diisocyanate, isophorone diisocyanate (IPDI), and the like can be optionally used.

Structural formula B is a polyether polyol adducted to glycerol (l=1) or sorbitol (l=4).

Structural formula C is trimethylolpropane with polyether added. Similarly, 1 of structural formula J,
2,6-hexanetriol, trimethylolethane of structural formula K, pentaerythritol of structural formula L, polyglycerin of structural formula M (n = positive integer of 2 to 30), and polyhydric alcohols such as partial esters thereof; Adducts of polyether polyols can also be used.

[0034]

[Chemical formula 10]

[0035]

[Chemical formula 11]

[0036]

[Chemical formula 12]

[0037]

[Chemical formula 13]

In this case, AO may be a homopolymer, a block copolymer or a random copolymer. Structural formula D is a polyether polyol having an alkylene oxide chain, and both ends may be -OH groups, or one end may be blocked with an alkyl group, aromatic group, etc., and is easily available as a commercial product. can.

The polyisocyanate prepolymers are represented by structural formulas E to I. Structural formulas E and F are tetrafunctional tetraisocyanates obtained by dimerizing two molecules of triisocyanate obtained by reacting trimethylolpropane and glycerol with a diisocyanate with one molecule of AO. F uses glycerol instead of trimethylolpropane. Since this type of tetraisocyanate tends to dimerize with two or three molecules of AO, it is necessary to delicately control the reaction. Therefore, unreacted triisocyanate is mixed, but when it reacts with a polyol, the size of the segmented polyurethane molecules varies, which may work in an advantageous way to control tackiness. Structural formula D is obtained by reacting polyol B with diisocyanate. Structural formula H is similarly obtained by reacting structural formula C with diisocyanate, and is trifunctional. Structural formula I is a reaction product of polyether polyol and diisocyanate and is difunctional.

The alkylene oxide chain represented by AO in the structural formula will be described. The alkylene oxide chain of the polyol, polyisocyanate must be polypropylene glycol, polyethylene glycol, or a copolymer thereof, such as a polymer having the structure N.

[0041]

[Chemical formula 14]

Most or all of the alkylene oxide chains are liquid at room temperature because the segmented polyurethane is a sticky substance at room temperature and has excellent adhesive properties such as adhesive strength, holding power, and tack. It is better to be a state compound.

Since most or all of the alkylene oxide chains are in a liquid state at room temperature, the molecular weight is regulated. Polyethylene glycol has MW: 150
-1000 Preferably 300-800 Polypropylene glycol is still liquid even if its molecular weight is tens of thousands, and can be used over a wide range, but if the ratio of end groups is small, the reaction probability will be low, and if the chain is too long This is not desirable because the adhesive becomes highly fluid and has poor shape retention. Preferably, a range of about 200 to several thousand can be used.

The liquid properties of polyethylene glycol and polypropylene glycol copolymers are determined by their blending ratio. In other words, when the mole fraction of polypropylene glycol is high, it remains liquid even if the molecular weight is high;
Even if the molar fraction of polypropylene glycol is low, if the molecular weight of polyethylene glycol is low, it becomes liquid. However, as described for polypropylene glycol, high molecular weight causes problems such as shape retention.
Polymers that are liquid at room temperature and have a molecular weight of 60 to 8,000, preferably 800 to 6,000 can be used.

[0045] Each prepolymer of the polyol or polyisocyanate described above is solid if the alkylene oxide chain, which is a segment constituting it, is solid at room temperature, and if it is liquid, the prepolymer itself is liquid. It can be roughly said that. This is even more true for segments where linear molecules account for the majority of the molecular weight. If both the polyol and polyisocyanate prepolymers are viscous liquids at room temperature, the segmented polyurethane obtained by reaction will be a sticky resin. However, if one of them is solid or both are extremely viscous liquid or semi-solid, the segmented polyurethane obtained by the reaction will be a solid resin with no stickiness at room temperature, which is not suitable for the present invention. . However, if all the segments are liquid, apart from this, a semi-solid or solid prepolymer may be partially mixed in order to adjust the adhesion.

On the other hand, in the case of segmented polyurethane, which is a reaction product of a prepolymer composed only of low-molecular-weight segments, even if the segment is liquid at room temperature, it cannot be used as a highly adhesive adhesive. Must not be. This is because when the segment length is short, the molecules of the liquid segment are restrained by the intersection points of the urethane bond molecules, that is, the knot points, and are restrained from moving freely. be. In other words, in a state where the network chain concentration is high, even if the segments are liquid, they become a viscoelastic body with superior elasticity, resulting in an adhesive with relatively poor adhesive strength and holding power. Therefore, it is essential for some or most of the segments to have an appropriate molecular length in order to exhibit sufficient adhesiveness, and this length can be said to be the above-mentioned value.

The reaction ratio of polyol and polyisocyanate will be described below. Empirically speaking, the molecular aggregate of adhesive substances has a relatively bulky structure with an appropriate molecular weight, a segment length that allows free movement, or a large number of linear terminal molecules. It is necessary to do so. Therefore, if the polyol and polyisocyanate are each a single compound, it is necessary that one is a difunctional compound and the other is a combination of trifunctional or higher functional compounds. If either one is monofunctional, there is no chain. Bifunctional molecules result in linear molecules, and if the prepolymer is not branched from the beginning, it will not form a collection of bulky molecules, which is not appropriate. In other words, either one of them is difunctional and the other is trifunctional or more polyfunctional, or a combination of trifunctional or more functional is preferable. However, in the case of reactants having too high a functional number, the network chain concentration is too high, and unless there are very long segments, the elasticity exceeds the viscosity and it is difficult to obtain desirable adhesiveness. It can be said that combinations of functional numbers of approximately 2 to 4 tend to provide good adhesiveness. In this case, in order to finely adjust the adhesion, it is possible to mix and use materials with one functional group to increase the bulk. In addition, if the AO chains of polyols and polyisocyanate prepolymers are quite long, use polyfunctional polyhydric alcohols or polyvalent isocyanates (none of which have AO segments).
may be used in combination.

The reaction ratio of each prepolymer of polyol and polyisocyanate is determined by the ratio of terminal functional groups, that is, O
It can be regulated by the value of H/NCO. Unreacted -NCO
OH/NCO must be 1 or more because if it remains, a post reaction will occur. Empirically, a good adhesive can be obtained when 1≦OH/NCO≦5. In a state where OH/NCO is 1 or more and 5 or less, it can be imagined that a straight chain segment having an OH group at the end of a bulky molecule is in a state in which it is moving freely with a tail sticking out. The closer to 5 fr
The tails of the ee are long and numerous. These polymer molecules are aggregated in a size suitable for exhibiting adhesive properties. The molecular weight range of the polyol and polyisocyanate constituting the adhesive material of the present invention is AO, the type of isocyanate,
Although it varies widely depending on the molecular shape and whether the AO is a homopolymer or a copolymer, it is approximately 1,400 to 10,000 for polyurethane polyol prepolymers.
Approximately 150 to 6,000 for polyol, approximately 500 to 10,000 for polyurethane polyisocyanate prepolymer
However, preferably approximately 1000 to 6000, 3
It can be selected in the range of 00 to 3000, approximately 1000 to 6000.

Unlike low-molecular monomers, polyols and polyisocyanates are prepolymers with relatively high molecular weights, so they have a slightly high viscosity. For this purpose, it is possible to mix the two well and use a solvent that does not react with the resin to lower the viscosity.

The facial beauty adhesive pad material of the present invention must have a structure in which a sheet-like base material is embedded inside the above-mentioned adhesive or placed on the surface thereof. As for the manufacturing method, it can be easily obtained by immediately applying or casting the mixed resin onto a sheet-like base material to impregnate the sheet-like base material, and then causing a curing reaction.

The sheet-like base material used in the facial adhesive pad material of the present invention is a nonwoven fabric of natural fibers or synthetic fibers, but polyester, polyamide, polypropylene, cellulose, etc. are preferably used for reasons such as texture. be done. The appropriate thickness of the sheet-like base material is a thickness corresponding to 10 to 200 g/m2. Furthermore, it is also possible to add a small amount of perfume to impart a scent suitable for a facial pad, or to add a small amount of various moisturizing agents or skin lubricants to transfer the active ingredients to the skin side.

[0052]

[Function] The adhesive used in the facial beauty adhesive pad of the present invention is excellent in its ability to be repeatedly applied. The reason for this will be explained in detail below. Living skin consists of three parts: epidermis, dermis, and subcutaneous tissue.
The epidermis consists of layers, with the stratum corneum being the outermost layer of the epidermis. The stratum corneum is made up of extremely hydrophilic corneocytes that contain cytoplasm, which is an aqueous protein solution, and extremely hydrophobic lipids that contain large amounts of triglyceride and exist in the spaces between these cells. The urethane adhesive used in the present invention has hydrophilic polyethylene glycol and hydrophobic polypropylene glycol as its main components, and the ratio of the hydrophilic component to the hydrophobic component greatly affects the repeatability of the adhesive. -ing That is, with respect to the two components having different properties of hydrophilicity and hydrophobicity in the stratum corneum, polyethylene glycol, which is a hydrophilic component, and polypropylene glycol, which is a hydrophobic component, in the adhesive component moderately influence each other, Overall, it shows good adhesion behavior. In other words, if the adhesive is too strong, it will peel off the stratum corneum when it is peeled off from the skin and transfer it to the surface of the adhesive layer, creating a film of stratum corneum on the surface of the adhesive and making it impossible to apply the adhesive again. It becomes impossible. Therefore, if the adhesive can be applied and peeled off without transferring the stratum corneum to the adhesive layer side, repeated applicability will be possible. The appropriate molar ratio of polypropylene glycol is 30 to 80%; if the molar ratio exceeds 80%, the adhesive as a whole will be too hydrophobic, and if it is lower than 30%, it will be too hydrophilic; in the former case. In the case of the latter, there is a problem that more of the stratum corneum migrates to the adhesive, and in the latter case there is a problem such as a decrease in adhesive strength, and in both cases, the repeatability of application becomes poor.

[0053] Furthermore, the facial adhesive pad material having the above structure is not toxic to the human body and is excellent in safety. Furthermore, it goes without saying that the area where the facial beauty adhesive pad of the present invention can be used is not limited to the face;
This includes all parts of the body, including the knees, elbows, and ankles.

[0054]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a facial beauty adhesive pad A using a facial beauty adhesive pad material, and FIGS. 2 and 3 are configuration diagrams thereof. 1 is a pad body, and 2 is a release paper. The pad body 1 has a pad material 3 according to the present invention sandwiched between a base material 4 and a cover material 5, and uses an opening 6 formed in the cover material 5 to expose the surface of the adhesive 31 of the pad material 3. I've let it happen. The pad material 3 includes a sheet-like base material 32 and an adhesive 3.
1, and FIG. 2 shows that it is embedded inside the adhesive 31, and FIG. 3 shows that it is embedded on the surface of the adhesive 31. Note that the release paper 2 is used to protect the adhesive 31 when not in use.
It is peeled off when used. The manufacturing method of the adhesive pad material 3 for facial beauty is as described above.

[0055] According to such an adhesive pad for facial beauty, after peeling off the release paper 2, it is necessary to repeatedly press the adhesive 31 on an arbitrary location such as the corner of the eye on the face, and then peel it off after pressing. As a result, dead skin cells, makeup residue, dirt, etc. on the skin surface can be attached to the adhesive 31 and removed from the skin surface. When the pad is peeled off after being pressed against the skin surface, the adhesive 31 adhering to the skin surface is stretched by its viscosity and then completely peeled off from the skin surface, and at that moment the adhesive 31 is removed from the skin surface.
Due to the elasticity of 1, it suddenly shrinks toward the pad side. This behavior causes a phenomenon in which dead skin cells and dirt attached to the surface of the adhesive 31 are taken into the inside of the adhesive 31 that has rapidly shrunk toward the pad side. The surface of the adhesive 31 is less likely to be soiled and exhibits excellent repeatability.

[0056]

[Experimental Examples 1 and 2] Polyols, polyisocyanates, and catalysts having structures and molecular weights corresponding to the above structural formula numbers are mixed in the proportions shown in Table 1, and impregnated into a sheet-like base material of 200 μm thick polyester nonwoven fabric. Thereafter, it was reacted and cured at 60°C. Thereafter, one side was bonded to a polyester nonwoven fabric having a thickness of 360 μm, and the other side was bonded to a similar nonwoven fabric with an open window to obtain a facial pad having the shape shown in FIG. 1. When I repeatedly applied this pad to my face after washing my face and peeled it off, I found that makeup remained on my face.
Dirt and aged keratin can be removed very easily. moreover,
Practical adhesive strength was maintained even after pasting several dozen times.

[0057]

[Table 1]

[0058]

[Experimental Example 3] A polyol having a structure and molecular weight corresponding to the above structural formula number, a polyisocyanate, a catalyst, and fragrance and squalane as additives were mixed in the proportions shown in Table 2, and a sheet of polyester nonwoven fabric with a thickness of 200 μm was prepared. After casting on the base material, it was reacted and cured at 60°C. Thereafter, one side was laminated with a polypropylene nonwoven fabric having a thickness of 450 μm, and the other side was laminated with a similar nonwoven fabric with an open window to obtain a facial pad having the same shape as in Experimental Examples 1 and 2. By repeatedly applying this pad to the face after washing and peeling it off, makeup residue, dirt, and aging keratin could be removed from the face very easily. In addition, since it contains fragrance and squalane as additives, it provides a pleasant scent when used, and at the same time, a small amount of squalane transfers to the skin when applied to the skin, increasing the lubricity of the skin. played. Moreover, the repeatability of pasting was also excellent as in Experimental Examples 1 and 2.

[0059]

[Table 2]

[0060]

[Effects of the Invention] The adhesive of the present invention is characterized in that a sheet-like base material is embedded inside or placed on the surface of a urethane adhesive having polypropylene glycol and polyethylene glycol as segment chains,
It has the effect of removing makeup residue, dirt, and aging keratin very easily. In addition, it can be applied frequently and repeatedly, is highly safe for the human body, is flexible, has excellent adhesion and familiarity to the skin, is transparent and does not change color, is hygienic, and does not cause discomfort or disgust. In addition to this advantage, it also has the advantage of being lightweight and not bulky, making it convenient to carry.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a facial adhesive pad using the pad material of the present invention.

FIG. 2 is a configuration diagram of the pad material of the present invention.

FIG. 3 is a configuration diagram of the pad material of the present invention.

[Explanation of symbols]

3 Adhesive pad material 31 Adhesive 32 Sheet-like base material

Claims (1)

[Claims] 1. A facial adhesive pad material comprising a sheet-like base material embedded within or placed on the surface of a urethane adhesive having polypropylene glycol and polyethylene glycol as segment chains.