Water-in-oil emulsion cosmetics

Abstract

A water-in-oil emulsion cosmetic free of stickiness and oiliness, having semi-transparent or transparent appearance to effect feel of freshness, and able to provide moisturized feel is provided. The water-in-oil emulsion cosmetic contains (a) a solid moisturizer, (b) a polyether-modified silicone, and (c) a silicone oil having a refractive index in the range from 1.380 to 1.420 at 25° C., wherein a moisturizer content is 22 mass % or more relative to the total amount of the cosmetic.

Claims

1. A water-in-oil emulsion cosmetic comprising: (a) a solid moisturizer; (b) a polyether-modified silicone in an amount within a range from 0.1 to 10 wt % relative to the total amount of the cosmetic; (c) a silicone oil having a refractive index in the range from 1.380 to 1.420 at 25° C.; (d) a silicone elastomer; and (e) a liquid moisturizer, wherein a moisturizer content is 22 mass % or more relative to the total amount of the cosmetic, the (a) solid moisturizer is a solid polyol and/or a solid amino acid, the solid moisturizer includes at least bis-PEG-18 methyl ether dimethyl silane and is contained in an amount within a range from 0.1 to 25 wt % relative to the total amount of the cosmetic, the (d) silicone elastomer is contained in an amount within a range from 0.1 to 5 wt % relative to the total amount of the cosmetic in a form of a swelled product swelled with a liquid oil that is liquid at room temperature, a mixing ratio of the (d) silicone elastomer to the liquid oil is in the range from 5:95 to 40:60 in mass ratio, the liquid oil used to swell the (d) silicone elastomer includes at least one selected from a group consisting of a liquid silicone oil, a liquid hydrocarbon oil, a liquid ester oil and a liquid higher fatty acids, and a content of the (e) liquid moisturizer is 0.1 to 20 mass % relative to the total amount of the cosmetic.

2. The water-in-oil emulsion cosmetic as claimed in claim 1, wherein the solid polyol and/or solid amino acid further includes at least one selected from a group consisting of polyethylene glycol having an average molecular weight in the range from 1,000 to 25,000, erythritol, trehalose, xylitol, trimethylglycine, and glycylglycine.

3. The water-in-oil emulsion cosmetic as claimed in claim 1, wherein the (b) polyether-modified silicone has an HLB value in the range from 1 to 10.

4. The water-in-oil emulsion cosmetic as claimed in claim 3, wherein the (b) polyether-modified silicone has an HLB value in the range from 2 to 7.

5. The water-in-oil emulsion cosmetic as claimed in claim 4, wherein the (b) polyether-modified silicone is at least one selected from polyoxyethylene methylpolysiloxane copolymer, cetyl dimethicone copolyol, poly(oxyethylene-oxypropylene) methylpolysiloxane copolymer, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, and methylpolysiloxane cetyl methyl polysiloxane poly(oxyethylene-oxypropylene) methylpolysiloxane copolymer.

6. The water-in-oil emulsion cosmetic as claimed in claim 1, wherein the (d) silicone elastomer is dimethicone crosspolymer or dimethicone/vinyl dimethicone crosspolymer.

7. The water-in-oil emulsion cosmetic as claimed in claim 1 being semi-transparent or transparent.

8. The water-in-oil emulsion cosmetic as claimed in claim 2, wherein the (b) polyether-modified silicone has an HLB value in the range from 1 to 10.

9. The water-in-oil emulsion cosmetic as claimed in claim 5 being semi-transparent or transparent.

Description

EXAMPLES

(1) Next, the present disclosure is more specifically described with reference to examples. The following examples are not intended to limit the disclosure.

Examples 1 to 5 and Comparative Examples 1 to 4

(2) Samples of skin care cream, as a water-in-oil emulsion cosmetic, were produced according to the formulations shown in Table 1, and the resulting samples of skin care cream were evaluated according to criteria shown below from the view points of transparency and feel during use (stickiness, oiliness, and moisturized feel). The results are shown in Table 1 along with the formulations, where the content of each component is in mass %.

(3) Details, such as product names, of the raw materials shown in Table 1 are as follows.

(4) * Polyoxyethylene methylpolysiloxane copolymer: SILICONE KF-6017P (available from Shin-Etsu Chemical Co., Ltd.)

(5) ** Methyl siloxane network polymer: TOSPEARL 3000A (available from Momentive Performance Materials Japan LLC)

(6) *** Cross-linked silicone network silicone block copolymer: KSP-102 (available from Shin-Etsu Chemical Co., Ltd.)

(7) Transparency

(8) Transparency of the composition of each example was visually observed and evaluated according to the criteria shown below.

(9) AA: The composition was transparent and letters were able to be seen clearly therethrough.

(10) A: The composition exhibited a trace of cloudiness but was almost transparent, and letters were able to be seen clearly therethrough.

(11) B: The composition was slightly cloudy and letters were not able to be seen clearly therethrough but identifiable.

(12) C: The composition was cloudy and transparent, and letters were not identifiable therethrough.

(13) Feel During Use

(14) The composition of each example was evaluated for feel during use (stickiness, oiliness, and moisturized feel) according to the criteria shown below based on answers to questionnaire.

(15) Evaluation Criteria

(16) AA: 18 or more people among 20 people answered “good.”

(17) A: 12 to 17 people among 20 people answered “good.”

(18) B: 5 to 11 people among 20 people answered “good.”

(19) C: Less than 4 people among 20 people answered “good.”

(20) TABLE-US-00001 TABLE 1 Comp. Comp. Comp. Comp. Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Aqueous Water Ion-exchanged water balance balance balance balance balance balance balance balance balance phase Moisturizer Dynamite glycerin 10 10 10 10 30 5 Dipropylene glycol 10 10 10 10 8 Xylitol 10 10 10 Erythritol 5 5 5 5 5 5 5 5 Trimethylglycine 5 5 5 5 5 5 5 5 Glycylglycine PEG-20 (average molecular 5 5 5 weight: 1000) PEG-150 (average molecular 3 3 3 weight: 6000) PEG-400 (average molecular 1 weight 20000) Bis-PEG-18 methyl 5 3 3 3 3 5 5 ether dimethylsilane Medicament Tranexamic acid 1 Potassium 4-methoxysalicylate 1 1-piperidine propionic acid 1 Chelating- EDTA-3Na2H.sub.2O 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 agent Stabilizer Sodium chloride 1 1 1 1 1 1 1 1 1 Antiseptic Phenoxyethanol 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Oil Polyether- Polyoxyethylene methylpolysiloxane 1 1 1 1 1 1 1 phase modified copolymer (HLB 4.5)* silicone Lauryl PEG-9 polydimethylsiloxyethyl 1 dimethicone (HLB 3) PEG/PPG-19/19 dimethicone (HLB 3) 0.75 0.75 0.75 0.75 0.75 0.75 0.75 Methylpolysiloxane cetyl methyl 1.5 polysiloxane poly(oxyethylene- oxypropylene) methylpolysiloxane copolymer (HLB 5) Surfactant Diglyceryl diisostearate 2.5 Silicone oil Dimethicone (refractive index: 1.397) 10 10 10 Cyclomethicone (refractive 13.8 14.3 14.3 14.3 10 10 index: 1.396) Methylphenyl polysiloxane (refractive index: 1.5) Decamethylcyclopentasiloxane 0.75 (refractive index: 1.396) Hydrocarbon Hydrogenated isobutene 0.75 0.75 0.75 0.75 0.75 0.75 oil Silicone Dimethicone crosspolymer 0.7 0.7 0.7 elastomer Dimethicone/vinyl 1.2 dimethicone crosspolymer Powder Methyl siloxane network polymer** 1 Cross-linked silicone network 1 silicone block copolymer*** Total 100 100 100 100 100 100 100 100 100 Evaluation Transparency AA A AA AA AA A C C not able to be prepared Feel during use A A A A A C B C —

(21) As shown in Table 1, the water-in-oil emulsion cosmetic of the disclosure was free of stickiness and oiliness, exhibited transparent appearance to effect feel of freshness, and provided moisturized feel. Although Example 1 did not contain glycerin or liquid polyol, it exhibited good transparency and provided satisfactory feel during use. Further, as exhibited by Examples 2 to 5, the water-in-oil emulsion cosmetic of the disclosure containing glycerin or liquid polyol was also free of stickiness and oiliness and provided good feel during use.

(22) On the other hand, Comparative Example 1, which contained only a liquid moisturizer, exhibited stickiness and poor penetration into the skin. The composition of Comparative Example 2, in which the content of the moisturizer relative to the total amount of the cosmetic was low, was cloudy and exhibited stickiness. The composition of Comparative Example 3, which used a silicone oil having a refractive index out of the range defined in the disclosure, was also cloudy and exhibited stickiness and oiliness. The composition of Comparative Example 4, in which the surfactant was not a polyether-modified silicone, was not able to be prepared.