JP2000333726A - Sponge puff for makeup and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sponge puff for makeup that does not have a malodor like sulfur or the like, more flexible than conventional ones and easily conforms to the skin. SOLUTION: A sponge puff for makeup is formed by foaming a 100 wt.% of a prepolymer prepared by mixing both or either of toluenediisocyanate or diphenylmethanediisocyanate to a polyether, polyol in which the number of functional group number is 2 to 6, ethylene oxide ration in an adduct is 40 to 100 wt.%, and molecular foreight is 600 to 4000, so that NCO may be 3 to 20 wt.%, and 40 to 150 wt.% of water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a cosmetic sponge puff and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a cosmetic sponge puff, a rubber sponge made from synthetic rubber latex has been widely used. This puff made of rubber sponge, after entraining air into a high viscosity latex emulsion,
It is obtained by casting, heat vulcanization, demolding, and cutting into puff shapes.

[0003] The rubber sponge puff has a degree of flexibility suitable for contact with human skin, and has a low odor and a feeling of use by removing post-molding residues in the rubber sponge. There is an advantage that can be made good.
Furthermore, the rubber sponge puff has good compatibility with moisture since it is made of latex, and can exhibit a desired slimy feeling when using the puff.

[0004]

However, the rubber sponge puff must be vulcanized by adding sulfur.
Post-processing does not completely remove the sulfur odor, and may be disliked by users who are sensitive to the odor. Further, in recent years, puffs that are more flexible and easily adapt to human skin have been required, but it has been difficult to constitute such puffs with the rubber sponge.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a sponge puff for cosmetics which is free from unpleasant odors such as sulfur odors, and which is more flexible than conventional ones and which is easy to adapt to human skin. It provides a method.

[0006]

The invention relating to a cosmetic sponge puff has a functional group number of 2 to 6, an ethylene oxide ratio in an adduct of 40 to 100% by weight, and a molecular weight of 600 to 4%.
2,000 polyether polyols and either or both of toluene diisocyanate and diphenylmethane diisocyanate are mixed to give an NCO% of 3 to 20% by weight.
The present invention relates to a cosmetic sponge puff foam-formed from a prepolymer prepared as described above and water. The amount of water is prepolymer 1
It is preferably 40 to 150 parts by weight based on 00 parts by weight.

The invention according to the method for producing a sponge puff for cosmetics has a functional group number of 2 to 6, an ethylene oxide ratio in an adduct of 40 to 100% by weight, and a molecular weight of 600 to 4%.
A mixture of water and a prepolymer prepared by mixing both or one of toluene diisocyanate and diphenylmethane diisocyanate with 2,000 polyether polyol so that the NCO% becomes 3 to 20% by weight, and foaming the mixture by stirring. And a method for producing a cosmetic sponge puff. The amount of water is preferably from 40 to 150 parts by weight per 100 parts by weight of prepolymer. The liquid temperature during mixing and stirring of the prepolymer and water is preferably 5 to 40C.

Among the polyether polyols used in the present invention, among those obtained by addition polymerization of an adduct to an initiator in the presence of a basic catalyst, the following are suitably used for puffs. That is, ethylene oxide is added to an initiator having 2 to 6 functional groups, and 40 to 100
A polyalkylene polyether polyol having a number average molecular weight of 600 to 4,000 by weight% is used.

As the initiator, known hydroxyl-terminated monomers and the like are used. For example, diols such as ethylene glycol, diethylene glycol, dipropylene glycol, and 1,4-butanediol as bifunctional initiators;
Triols such as glycerin, trimethylolpropane, 1,2,6-hexanetriol, and triethanolamine as functional initiators, and pentaerythritol, ethylenediamine, tolylenediamine, diphenylmethanediamine, methyl glucooxide, and pentafunctional as functional initiators Examples of the agent include 2,2,6,6-tetrakishydroxycyclohexanol and diethylenetriamine, and examples of the hexafunctional initiator include sorbitol, mannitol, and dulcitol.

Examples of the adduct include alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide and styrene oxide. The proportion of ethylene oxide in the total adduct was 40% by weight.
If it is less than 3, the resulting cosmetic sponge puff does not exhibit hydrophilicity, and a slimy feeling that makes the feeling of use good can not be obtained. In addition, all the adducts may be ethylene oxide.

[0011] The number average molecular weight of the polyether polyol used is 600-4000. If the molecular weight of the polyol is less than 600, the effect of the isocyanate exhibiting hydrophobicity increases, and even if the polyol has a hydrophilic property, the resulting cosmetic sponge puff loses its hydrophilicity and has a slimy feeling. You will run out. On the other hand, when the molecular weight of the polyol to be used exceeds 4000, the viscosity of the obtained prepolymer becomes too high, resulting in poor stirring during mixing with the isocyanate, making it impossible to obtain a cosmetic sponge puff having a uniform cell structure.

The polyether polyol may be a mixture of a plurality of polyether polyols having different numbers of functional groups. For example, a diol and a triol are
The mixture may be mixed at a weight ratio of 1 to 4: 1. In this case, the softness of the cosmetic sponge puff is further ensured by including the diol in a larger amount than the triol.

The isocyanate used in the present invention is suitably an aromatic isocyanate. When an aliphatic isocyanate is used, residual free isocyanate generated after the prepolymer is synthesized by adding in excess may cause rash to human skin. As the aromatic isocyanate used, toluene diisocyanate (TDI)
Alternatively, both or one of diphenylmethane dissocyanate (MDI) is used. Examples of the toluene diisocyanate include 2,4-toluene diisocyanate and 2,6-toluene diisocyanate alone or a mixture thereof. In addition, derivatives thereof can also be used as diphenylmethane dissocyanate.

NCO% of prepolymer in the present invention
Is preferably 3 to 20% by weight. If the NCO% is smaller than the above range, the viscosity of the prepolymer is too high to handle. Further, the polymerization reaction proceeds excessively, and the heat generation is severe and dangerous. Conversely, if NCO% is larger than the above range, NC
Since the absolute amount of the O terminal group is small, a good foam cannot be obtained.

The prepolymer in the present invention can be obtained by a known method for bonding a polyether polyol and a polyisocyanate. For example, the required amount of the polyether polyol and isocyanate are mixed, and usually 3
It is obtained by heating at a temperature of 0 to 150 ° C.

In the present invention, water is a prepolymer 100
It is used in an amount of 40 to 150 parts by weight based on parts by weight. 4 water
If the amount is less than 0 parts by weight, foaming failure occurs, the number of closed cells increases, and a soft sponge puff having a low density cannot be obtained. Is not possible, only waste liquid increases. More preferably, the amount of water is 80 to 120 parts by weight with respect to 100 parts by weight of the prepolymer, and it is preferable from the viewpoint of process control that the ratio of the prepolymer to water be as close as possible. This is because the prepolymer is used as the component A and the water is used as the component B, and foaming is performed by discharging with a two-liquid injection device. Therefore, it is better to make the discharge ratio of the two liquids closer to an equal value, so that the mixing is excellent and the foaming state is improved. This is because the process is improved and the process control is easy.

The production of the cosmetic sponge puff of the present invention is performed as follows. NCO% 3-20 prepared from the polyether polyol and isocyanate
100% by weight of the prepolymer as the component A, water 4
A slab foam is obtained by mixing 0 to 150 parts by weight of the B component, adjusting the temperature of the solution to 5 to 40 ° C., mixing and stirring with an injector, and discharging the mixture into a predetermined mold to foam. The mold may be either an open mold or a covered mold.
At that time, if the liquid temperature is lower than 5 ° C., the reaction accelerating effect cannot be obtained, the reaction is delayed and the foaming is not sufficiently performed, and the resulting foam becomes a high-density hard one, which is not suitable for puffing.
On the other hand, when the liquid temperature is higher than 40 ° C., the reaction proceeds excessively, the reaction balance between foaming and resinification cannot be maintained, the cells become coarse, and a foam having an appropriate strength for puff cannot be obtained.

An additive is appropriately added to the water as the component B. Examples of the additive include a surfactant, a colorant, and a catalyst. All additives are known ones used as urethane foam raw materials, and examples thereof include a silicone foam stabilizer, an amine catalyst, and a metal catalyst comprising a tin or lead compound. The foam obtained as described above is cut into a desired puff size by cutting or the like as necessary.

[0019]

According to the present invention, a cosmetic sponge puff can be obtained by a simple prepolymer method. In addition, according to the present invention, since a vulcanization operation using sulfur such as a rubber sponge puff is not required, an unpleasant odor does not remain, and a puff having a good feeling in use can be obtained. Further, in the present invention, a polyether polyol is used, and the ratio of ethylene oxide in all the adducts is set to 40% by weight to 100% by weight. TDI and MDI are used as isocyanates, and 100 parts by weight of the prepolymer is used. Since 40 to 150 parts by weight of water is used, the puff exhibits not only the hydrophilicity required for a cosmetic puff and a slimy feeling but also a low-density and flexible puff which is easily adapted to human skin. Furthermore, in order to set the liquid temperature during mixing and stirring of the prepolymer and water to 5 to 40 ° C,
The reaction balance between foaming and resinification is balanced, and fine cells are formed, so that a puff that is flexible and has appropriate strength can be obtained.

[0020]

EXAMPLES Example 1 Ethylene glycol was used as an initiator, and ethylene oxide and propylene oxide were added to ethylene glycol so that the content of ethylene oxide with respect to all adducts became 40% by weight to obtain a polyether polyol having a molecular weight of 3000. 100 parts by weight of this polyether polyol and 50 parts by weight of toluene diisocyanate (2,4 / 2,6 isomer ratio = 80/20) as an isocyanate are put in a reaction vessel and mixed at 100 ° C. for 2 hours. Thus, a urethane prepolymer having a reactive NCO content of 7.0% by weight was obtained. To 100 parts by weight of this urethane prepolymer, 5 parts by weight of polyoxyethylene nonylphenol as a surfactant and 100 parts by weight of water were added, mixed and stirred at a liquid temperature of 25 ° C., and discharged into a flat plate with an injector to obtain a density of 0.1%. 0
An 8 kg / cm ³ foam sheet was obtained. Thereafter, a die was cut into a substantially square puff shape with rounded four corners, and the end face was polished to produce a puff of 50 × 45 × 8 mm. Note that an elliptical or circular puff may be used. Also, a required sample was prepared from the remaining foam after processing into the puff, and the physical properties were measured. The measured values are as shown in Table 1.

Measurements of physical properties in the examples and comparative examples are as follows. The density is measured according to JIS K 6301, the hardness is measured according to JIS K 6301 Spring hardness tester F, the tensile strength is JIS K 6301 type 2, and the elongation is JIS.
K 6301. The water absorption test was 50 × 5
A 0 × 20 mm sample is floated on the water surface for 5 to 6 seconds after measuring the weight, then taken out of the water surface and weighed, and the hydrophilicity is determined by dividing the weight after floating on the water by the weight before floating on the water. Was judged. When water has high hydrophilicity and water permeates the foam in a short time, the calculation result of the water absorption measurement is the reciprocal of the density at the maximum.

Comparative Examples 1 and 2 As Comparative Example 1, puffs and test samples were prepared so that the ethylene oxide content in Example 1 was 30% by weight and the NCO% was 6.5% by weight. As Comparative Example 2, the ethylene oxide content in Example 1 was 50% by weight, and the molecular weight of the polyether polyol was 500%.
A puff and a test sample were prepared so that 0 and the NCO weight% became 3.0%. Table 1 shows the physical properties and the like.

[0023]

[Table 1]

Examples 2 and 3, Comparative Example 3 The initiator was glycerin, and ethylene oxide and propylene oxide were added to glycerin so that the content of ethylene oxide with respect to the total adduct was 50% by weight. An ether polyol is prepared, and 100 parts by weight of the polyether polyol is mixed with toluene diisocyanate (2,4 / 2,6
25 parts by weight (isomer ratio = 80/20) were put into a reaction vessel and mixed and reacted at 100 ° C. for 2 hours to obtain a urethane prepolymer having a reactive NCO content of 3.5% by weight. 5 parts by weight of polyoxyethylene nonylphenol as a surfactant and 100 parts by weight of water were added to 100 parts by weight of the urethane prepolymer.
Parts by weight, and mixed and stirred at a liquid temperature of 25 ° C. to a density of 0.0
A foam made of 57 kg / cm ³ was produced, and then a puff and a test sample of Example 2 were obtained in the same manner as in Example 1. Further, assuming that the molecular weight of the polyether polyol in Example 2 is 3000 and the NCO content is 8.4% by weight,
A puff and a test sample of Example 3 were obtained. Further, the molecular weight of the polyether polyol in Example 2 was 500,
A puff and a test sample of Comparative Example 3 were prepared with an NCO content of 7.0% by weight. Table 2 summarizes the results.

[0025]

[Table 2]

Example 4, Comparative Example 4 The initiator was pentaerythritol, and ethylene oxide and propylene oxide were added to pentaerythritol so that the content of ethylene oxide with respect to the total adduct was 60% by weight. An ether polyol is prepared, and 100 parts by weight of this polyether polyol and 70 parts by weight of toluene diisocyanate (2,4 / 2,6 isomer ratio = 80/20) as an isocyanate are placed in a reaction vessel, and the mixture is placed at 100 ° C. for 2 hours. The mixture was reacted to obtain a urethane prepolymer having a reactive NCO content of 12.0% by weight. To 100 parts by weight of the urethane prepolymer, 5 parts by weight of polyoxyethylene nonylphenol as a surfactant and 100 parts by weight of water were added, and mixed and stirred at a liquid temperature of 25 ° C. to obtain a foam having a density of 0.050 kg / cm ^3. A puff and a test sample of Example 4 were obtained from the foam in the same manner as in Example 1. The puff and test sample of Comparative Example 4 were obtained by setting the molecular weight of the polyether polyol in Example 4 to 600 and the NCO content to 18.0% by weight. Table 3 shows the results.

[0027]

[Table 3]

Example 5 Diethylene triamine was used as an initiator, and ethylene oxide was added to diethylene triamine to make the content of ethylene oxide to the total adduct 100% by weight and the molecular weight 70.
A polyether polyol having a ratio of 2,4 / 2,6 isomer (8: 4,2,6 isomer ratio = 8) was prepared by mixing 100 parts by weight of this polyether polyol with isocyanate.
(0/20) was placed in a reaction vessel and mixed and reacted at 100 ° C. for 2 hours to obtain a urethane prepolymer having a reactive NCO content of 10.0% by weight. To 100 parts by weight of this urethane prepolymer, 5 parts by weight of polyoxyethylene nonylphenol as a surfactant and 100 parts by weight of water were added, and the mixture was stirred at a liquid temperature of 25 ° C., and the density was 0.055 kg / c.
to obtain a foam consisting of m ^3, to prepare a puff and the test sample of Example 5 in the same manner as in Example 1 from the foam.
The results are shown in Table 3 above.

Examples 6 and 7 100 parts by weight of polyoxyethylene-polyoxypropylene-glycerol ether having an ethylene oxide content of 70% by weight and a molecular weight of 3000, and toluene diisocyanate (2,4 / 2,6 isomer ratio = 80) / 20) and 20.3 parts by weight were placed in a reaction vessel and mixed and reacted at 100 ° C. for 2 hours to obtain a urethane prepolymer having a reactive NCO content of 4.65% by weight. To 100 parts by weight of this urethane prepolymer, 5 parts by weight of polyoxyethylene nonylphenol as a surfactant and 150 parts by weight of water were added.
To obtain a foam having a density of 0.076 kg / cm ³ , and a puff and a test sample of Example 6 were prepared from the foam in the same manner as in Example 1. Example 6
MDI (trade name: MR)
-200, manufactured by Nippon Polyurethane Co., Ltd.) was used, and a puff and a test sample of Example 7 were prepared in the same manner as in Example 6, except that the amount of water was changed to 130 parts by weight. Table 4 shows the physical properties of Examples 6 and 7 and the physical properties of a commercially available sponge made of NBR latex as Comparative Example 5.

[0030]

[Table 4]

[0031]

As described above, according to the cosmetic sponge puff and the method for producing the same of the present invention, a puff can be obtained by a prepolymer method with a simple operation. Also,
In the present invention, since vulcanization using sulfur is unnecessary, the obtained puff is different from a rubber sponge puff, in which an unpleasant odor does not remain and a user who is sensitive to the odor can comfortably use it.

Further, in the present invention, a polyether polyol is used, the ratio of ethylene oxide in all adducts is 40% by weight to 100% by weight, TDI and MDI are used as isocyanate, and a prepolymer and water are used. And in particular, 4 parts of water per 100 parts by weight of water.
Since 0 to 150 parts by weight is used, not only the hydrophilicity required as a cosmetic puff is exhibited and a slimy feeling can be obtained, but also a puff having low density, flexibility, and easy to adapt to human skin can be obtained. In addition, since the liquid temperature during mixing and stirring of the prepolymer and water is 5 to 40 ° C., a puff having a fine cell structure and having flexibility and appropriate strength can be obtained.

Claims (5)

[Claims] 1. The number of functional groups is 2 to 6, the ethylene oxide ratio in the adduct is 40 to 100% by weight, and the molecular weight is 600.
A cosmetic sponge puff foam-formed from a prepolymer whose NCO% is adjusted to 3 to 20% by weight by mixing both or one of toluene diisocyanate and diphenylmethane diisocyanate with polyether polyol of ~ 4000 and water. 2. The cosmetic sponge puff according to claim 1, wherein the water is 40 to 150 parts by weight based on 100 parts by weight of the prepolymer. 3. The number of functional groups is 2 to 6, the ratio of ethylene oxide in the adduct is 40 to 100% by weight, and the molecular weight is 600.
Mixing, stirring and foaming a prepolymer prepared by mixing both or one of toluene diisocyanate and diphenylmethane diisocyanate with a polyether polyol of 4000 and an NCO% of 3 to 20% by weight, and water. A method for producing a cosmetic sponge puff. 4. The method for producing a cosmetic sponge puff according to claim 3, wherein the water is 40 to 150 parts by weight based on 100 parts by weight of the prepolymer. 5. The liquid temperature during mixing and stirring of the prepolymer and water is 5 to 40 ° C.
A method for producing a cosmetic sponge puff according to claim 1.