Soft polyurethane foam using hydrocarbon polyol, and cosmetic comprising same

Abstract

The present invention provides a composition for a soft urethane foam to prepare a soft urethane foam, comprising a polyol, and a foamed soft urethane foam using the same, wherein the polyol is any one selected from among a hydrocarbon polyol, a vegetable oil, and a vegetable-oil-derived dimer acid, or a mixture of a hydrocarbon polyol with any one selected from among a vegetable oil and a vegetable-oil-derived dimer acid. The present invention provides an impregnation material for impregnation of a cosmetic composition, which can control the polarity of the impregnation material for impregnating a hydrophilic cosmetic composition, and an impregnation-use urethane foam composition for preparing the same.

Claims

1. A cosmetic product comprising: a soft polyurethane foam; and a cosmetic composition impregnated in the soft polyurethane foam, wherein the soft polyurethane foam is prepared using a polyol, and wherein the polyol comprises a polybutadiene polyol selected from the group consisting of cis-1,4-polybutadiene polyol, trans-1,4-polybutadiene polyol, 1,2-polybutadiene polyol and a mixture thereof.

2. The cosmetic product according to claim 1, wherein the polyol has 2-10 hydroxy functional groups and a number-average molecular weight of 100-100,000 g/mol.

3. The cosmetic product according to claim 2, wherein the polyol has 2-3 hydroxy functional groups and a number-average molecular weight of 300-50,000 g/mol.

4. The cosmetic product according to claim 1, wherein the polyol further comprises castor oil.

5. The cosmetic product according to claim 4, wherein the castor oil is less than 50 wt % based on a total weight of the polyol.

6. The cosmetic product according to claim 1, wherein the polyurethane foam is prepared by reacting the polyol with an isocyanate compound, wherein the isocyanate compound is a one or more selected from a group consisting of tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate (NDI), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HMDI) and a derivative thereof.

7. The cosmetic product according to claim 1, wherein the cosmetic composition comprises liquid cosmetic composition.

8. The cosmetic product according to claim 1, wherein the cosmetic cosmetic composition has a viscosity of 1,000-10,000 cPs at 25 C.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 shows a reaction scheme wherein the double bonds of polybutadiene segments of polybutadiene polyol as a representative hydrocarbon polyol are crosslinked by a radical initiator.

(2) FIG. 2 shows a reaction scheme wherein the double bonds of polybutadiene segments of polybutadiene polyol as a representative hydrocarbon polyol are grafted by acrylic acid as one of acryl monomers in the presence of a radical initiator.

(3) FIG. 3 presents Chemical Formula 1 of the present disclosure.

BEST MODE

(4) Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to the description, it should be understood that the terms used in the specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present disclosure on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Therefore, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the disclosure, so it should be understood that other equivalents and modifications can be made thereto without departing from the scope of the disclosure.

(5) [Preparation of Soft Polyurethane Foam]

Example 1

Modification of Polyol

(6) A hydrocarbon polyol can be modified by performing grafting of a vinyl monomer or an acryl monomer before preparation of a foam or by performing crosslinking or grafting during the preparation of a foam.

(7) (1) Grafting of Vinyl Monomer or Acryl Monomer Before Preparation of Foam

(8) Polybutadiene polyol with a number-average molecular weight of 2,800 g/mol was modified by adding methacrylic acid to the polybutadiene polyol using benzoyl peroxide as an addition reaction initiator. Based on the total weight of the polyol, the content of the initiator was 0.2% and the addition amount of the methacrylic acid was 2%. The modification was performed at 80 C. for 6 hours.

(9) (2) Crosslinking or Grafting During Preparation of Foam

(10) A polybutadiene polyol-based polyurethane foam was modified during foaming of the polyurethane foam by adding methacrylic acid to polybutadiene polyol with a number-average molecular weight of 2,800 g/mol using t-butyl perbenzoate as an addition reaction initiator. Based on the total weight of the polyol, the content of the initiator was 0.2% and the addition amount of the methacrylic acid was 2%.

Example 2

Foaming of Polyurethane Foam Using Polybutadiene-Based Hydrocarbon Polyol and Castor Oil

(11) A soft polyurethane foam can be prepared using polybutadiene-based hydrocarbon polyol (0.2/0.6/0.2 (w/w) mixture of cis-1,4-polybutadiene polyol/trans-1,4-polybutadiene polyol/1,2-polybutadiene polyol) having a molecular weight 2,800 g/mol and having 2.5 functional groups and castor oil as follows. First, the polyol and castor oil are mixed as described in Table 1 at room temperature and then prepared into a sufficiently uniform state by stirring. Vacuum degassing and drying are conducted to remove gases included during the stirring of the mixture and water that may affect the reaction of polyurethane. A catalyst, a surfactant and a foaming agent are added to the obtained polyol mixture as described in the following table and then stirred at high speed for about 10 seconds. Then, after adding a weighed isocyanate compound (toluene diisocyanate (TDI T-80/T-65/T-100) and stirring at high speed for 10 seconds, the mixture is injected into a mold. During foaming, the time when the rise in height due to foaming stops (rise time: RT) and the time when fluidity is lost and strength is increased due to gelation (gelation time: GT) are checked to investigate the progress of the reaction. The obtained foam is kept at room temperature for 24 hours and then cut to suit the desired purpose. If necessary, the foam may be reticulated through an additional process.

(12) The mixing ratios and characteristics of the foam are described in Table 1. The content is given in wt % unit.

(13) TABLE-US-00001 TABLE 1 Sample code M1 M2 M3 M4 M5 Polybutadiene polyol (MW 2,800 100 90 80 70 60 g/mol, 2.5 functional groups) Castor oil 0 10 20 30 40 Water 2 2 2 2 2 Amine catalyst 0.6 0.6 0.6 0.6 0.6 (triethylenediamine) Organometal catalyst (stannous 1.0 1.0 1.0 1.0 1.0 octoate) Silicone surfactant (L590 from 1.5 1.5 1.5 1.5 1.5 Air Products) Isocyanate index* 100 100 100 100 100 RT (sec) 100 98 98 98 98 GT (sec) 125 122 118 115 110 State Good Good Good Good Good Density (kg/m.sup.3) 40 41 42 43 44 Hardness (Asker F) 50 60 70 80 90 *Isocyanate equivalents/polyol equivalents (also called NCO index)

(14) A soft urethane foam was prepared according to the method described above except that, while mixing the polyol with castor oil, t-butyl perbenzoate as a peroxide initiator and acrylic acid as an acryl monomer were added as described in Table 2 and then prepared into a sufficiently uniform state by stirring. Through the modification process, a butadiene polyol/castor oil/hydrogenated castor oil (70/25/5) mixture was obtained as a urethane foam composition.

(15) TABLE-US-00002 TABLE 2 Sample code M31 M32 M33 M34 M35 Polybutadiene polyol (MW 2,800 80 80 80 80 80 g/mol, 2.5 functional groups) Castor oil 20 20 20 20 20 Water 2 2 2 2 2 Amine catalyst 0.6 0.6 0.6 0.6 0.6 (triethylenediamine) Organometal catalyst (stannous 1.0 1.0 1.0 1.0 1.0 octoate) Silicone surfactant (L590) 1.5 1.5 1.5 1.5 1.5 Peroxide initiator (t-butyl 0.2 0.2 0.2 0.2 0.2 perbenzoate) Acryl monomer (acrylic acid) 0 0.5 1.0 1.5 2.0 Isocyanate index 100 100 100 100 100 RT (sec) 98 98 98 98 98 GT (sec) 118 119 118 118 119 State Good Good Good Good Good Density (kg/m.sup.3) 42 41 42 43 44 Hardness (Asker F) 72 73 74 75 76

(16) [Preparation of Cosmetic Composition]

(17) A foundation described in Table 3 was prepared as follows.

(18) After adding oil phase ingredients and a thickener in an oil phase tank and homogenizing the mixture by heating to 80 C., pigments were added and dispersed. In a water phase tank, water phase ingredients were added and completely melted by heating to 80 C. The resulting mixture was added to the oil phase tank in which the pigments were dispersed. Then, a low-viscosity sunblock emulsion was prepared by emulsifying with a homomixer. After filling the emulsion in a 40-mL container and keeping in a chamber at 25 C. for at least one day, viscosity was measured at 25 C. with a Brookfield LVII viscometer using spindle No. 4 after operation at 30 rpm for 1 minute.

(19) TABLE-US-00003 TABLE 3 Composition Composition Ingredients (wt %) 1 2 Oil phase Cyclopentasiloxane 25.0 25.0 ingredients Ethylhexyl 7.5 7.5 methoxycinnamate Ethylhexyl salicylate 3.0 3.0 Ethylhexanol 5.0 5.0 Dimethicone 3.0 3.0 Caprylic/capric triglyceride 3.0 3.0 PEG-10 dimethicone 3.0 3.0 Sorbitan sesquioleate 1.0 1.0 Disteardimonium hectorite 0.1 0.5 Pigments Titanium dioxide 5.0 5.0 Mica 3.0 3.0 Yellow iron oxide 1.0 1.0 Red iron oxide 0.2 0.2 Black iron oxide 0.1 0.1 Water phase Purified water To 100 To 100 ingredients Dipropylene glycol 5.0 5.0 Salt 1.0 1.0 Viscosity 2,000- 3,000- 3,000 cps 5,000 cps

(20) [Soft Urethane Foam Impregnating Material]

Test Example 1

Effect of Impregnation of Cosmetic Product

(21) The surface appearance of the soft urethane foams prepared according to Tables 1 and 2 was not different significantly from the commonly used sponge and were found to be useful to be used as an impregnating material for a cosmetic composition.

(22) The following experiments were conducted to investigate the soft urethane foams suitable to be used as an impregnating material for impregnating a cosmetic composition.

(23) Stability of Cosmetic Composition

(24) After impregnating the cosmetic compositions 1 and 2 with the viscosity controlled using an inorganic thickener into a sponge, the separation of the cosmetic composition in the sponge was observed (for 3 weeks after keeping in a constant-temperature oven at 50 C.).

(25) When the cosmetic compositions 1 and 2 were not impregnated into the sponge, separation of the oil ingredients occurred for both the compositions 1 and 2.

(26) TABLE-US-00004 TABLE 4 Ether-type Sample code urethane foam M2 M3 M4 M5 Stability of Separation No No No No cosmetic occurred in abnormality abnormality abnormality abnormality composition compositions 1 Sample code M32 M33 M34 M35 Stability of No No No No cosmetic abnormality abnormality abnormality abnormality composition

(27) As seen from Table 4, the soft urethane foam of the present disclosure showed superior stability without separation of the cosmetic composition whereas the separation of the cosmetic composition occurred in the ether-type urethane foam.

(28) Swelling Phenomenon

(29) After impregnating the cosmetic compositions 1 and 2 in the soft urethane foam, it was investigated whether swelling occurred 3 weeks later.

(30) As can be seen from the following table, the swelling phenomenon was improved with the degree of crosslinking. The larger the sample code number, the greater the degree of crosslinking.

(31) [Table 5]

(32) TABLE-US-00005 TABLE 5 Sample code Ether-type urethane foam M31 M33 M34 M35 Swelling 5% 8% 6% 5% 4% Sample code M2 M3 M4 M5 Swelling 10% 10% 10% 10%

(33) Disintegration or Corrosion (Hydrolysis Resistance)

(34) After impregnating the cosmetic composition sample 2 into a sponge, the change in external appurtenance was observed after keeping in a constant-temperature oven set to 50 C. for 3 weeks. The result is shown in Table 6.

(35) TABLE-US-00006 TABLE 6 Ether-type urethane foam Sample code (Korea Puff) M2 M3 M4 M5 Hydrolysis No abnormality No No No No resistance abnormality abnormality abnormality abnormality (corrosion resistance) Sample code Ester-type M32 M33 M34 M35 urethane foam (Korea Puff/FoamTech) Hydrolysis Disintegration No No No No resistance occurred abnormality abnormality abnormality abnormality (corrosion resistance)

(36) The ester-type urethane foam looked intact but was disintegrated when pressed with a finger. In contrast, the ether-type urethane foam and M2-M5 showed no abnormality. In particular, it was confirmed that the urethane foam was stable when the content of castor oil was less than 50 wt % based on the total weight of the polyol used to prepare the soft urethane foam due to good compatibility between the butadiene polyol and the vegetable oil. The urethane foams prepared according to the present disclosure showed no disintegration or collapse with time due to superior hydrolysis resistance.

(37) In particular, they showed improvement in swelling phenomenon as compared to the ether-type urethane foam which is known to have superior corrosion resistance.

(38) [Soft Urethane Foam Puff]

(39) A cosmetic applicator was prepared using the soft urethane foam prepared according to Tables 1 and 2. When applying a cosmetic composition to the skin using an applicator, a foam providing a soft touch tends to have a corrosiveness problem and one with improved corrosiveness tends to feel rather rough. However, the applicator (puff) prepared from the soft urethane foam of the present disclosure could provide soft touch while having strong corrosion resistance.

(40) In particular, the puff of the present disclosure did not show deformation or breaking even after washing.

(41) [Cosmetic Product Packing Material Using Soft Urethane Foam]

(42) A packaging material for packing a cosmetic composition was prepared using the soft urethane foam prepared according to Tables 1 and 2. The soft urethane foam of the present disclosure was suitable for packaging and packing a cosmetic composition due to superior elasticity and strong corrosion resistance. In addition, when used as a material for increasing adhesion to the cap of a container of mascara, it showed excellent elasticity and shape retaining ability.