JPH0242008A - Additive for cosmetic - Google Patents

Abstract

PURPOSE:To obtain an additive for cosmetic, capable of controlling a heat softening temperature as a hair setting agent, having excellent water resistance, sweat resistance and war resistance comprising a silicone resin containing >=a specific ratio of units such as CH3SiO3/2. CONSTITUTION:An additive for cosmetic containing >=70mol% (preferably >=75mol%) RSiO3/2 unit (R is substituted or nonsubstituted monofunctional hydrocarbon group) or an additive for cosmetic comprising a silicone resin mixture consisting of (A) a silicone resin made of 70-99mol% RSiO3/2, 5-0mol% SiO2 unit and 30-1mol% (R)2SiO unit and (B) a silicone resin made of 90-100mol% (B)RSiO3/2 unit and 10-0mol% SiO2 unit. The ratio of the latter blended is 0-100 pts.wt. component B based on 100 pts.wt. component A. The additive is useful for make-up cosmetic hair cosmetic, hand cream, etc.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to additives for cosmetics.

[Technical background of the invention and its problems] In recent years, the demand for makeup cosmetics has become more and more versatile, and in response to this trend, the product format has become limited to items such as lipstick, foundation, face powder, and nail polish. However, by further subdividing this into a wide variety of formulations, elements such as liquid, powder, solid, and emulsified formulations have been added. In particular, modern cosmetics are required to have better physical and chemical properties than ever before, such as water resistance, sweat resistance (sebum resistance), and abrasion resistance.

A method using a silicone resin having a film-forming ability has been proposed to satisfy these demands.

Regarding the application of such resins to cosmetics, for example, the application of hydrolyzed and condensed products of dichlorosilane and trichlorosilane to makeup cosmetics for the purpose of imparting water and oil resistance (Japanese Patent Application Laid-open No. 61-18708), Application of resins consisting of (R)3SiO units and 5i02 units to skin cosmetics (Japanese Patent Application Laid-open Nos. 61-65808 and 61-65809), SiO2
A resin consisting of R31O"/2 units and (R)SiO units is prepared using volatile silicone oil (Japanese Patent Application Laid-open No. 6
2-234012), (R)3SiO! 4 units and SiO□ units and R51O'/2 units and (R)zSi
Cosmetic additives using resins on OSi (Japanese Patent Laid-Open No. 1983
2-298512 and 61-298519), and hair styling compositions using curable silicone rubber and cyclic siloxane (see JP-A-63-22010).

[Object of the Invention] An object of the present invention is to provide a cosmetic additive useful as an additive for various cosmetics.

[Constitution of the Invention] The cosmetic additive of the present invention has an RS i O"/2 unit (
In the formula, R represents a substituted or unsubstituted monovalent hydrocarbon group)
It is characterized by containing a silicone resin containing 70 mol% or more of.

The cosmetic additive of the present invention contains a specific silicone resin as an essential component.

This silicone resin contains 70 mol% of R31O3/2 units.
It contains the above.

The substituted or unsubstituted monovalent hydrocarbon group for H in the R51O3/z unit includes methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group. alkyl groups such as dichloropentyl and cyclohexyl groups; aralkyl groups such as 2-phenylethyl and 2-phenylpropyl groups; aryl groups such as phenyl and tonol groups; : Alkenyl groups such as vinyl group and allyl group; and hydrocarbon groups such as chloromethyl group, chlorophenyl group, and 3.3.3-1-lifluoropropyl group. Among these, methyl group or r.''-phenyl group is preferred because raw materials are easily available.

If the content of R51O''/z units is less than 70 mol%, the softening temperature of the resin will be low, and especially in cosmetic applications where use at temperatures around body temperature is common, the feeling of use will be poor due to stickiness, so it is preferable. No.RS i
The content of O'/z units is more preferably 75 mol% or more.

Other structural units constituting the silicone resin are not particularly limited.

Such a silicone resin can be obtained by hydrolyzing and condensing a silane represented by the following formula; RSi (X) 3 and other silanes.

X in the above formula is a hydrolyzable group, and -M9 can be exemplified by a halogen element, a hydroxyl group, an alkoxy group, etc. Among these, alkoxy groups having 1 to 3 carbon atoms are preferred from the viewpoint of reactivity and ease of handling by-products.

Examples of the silane represented by RSi (X) include methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, phenyltrimethoxysilane, methyltrichlorosilane, and methyltrisilanol.

Further, the cosmetic additive of the present invention includes (A) RS i O”
/2 unit 70-99 mol%, SiO, +j11 position 5-O
A silicone resin consisting of 30 to 1 mol% of (R) zsiO units (the meaning of H in the formula is the same as above), and (B) R5iO3/25iO3/2 monomol% and 10 to 10 of SiO2 units. It is characterized by containing a mixture of silicone resin consisting of 0 mol %.

The silicone resin as the component (A) has RS i 03/2 units, S i 02 units, and (R) 2s1o units.

The content ratio of each structural unit is RS 103/z unit is 7
0-99 mol%, 5-0 mol% of 5iOz units and (R
) 30 to 1 mol % of SiO units.

When the proportion of R51O3/2 units is less than 70 mol %, the softening temperature of the resin becomes low, and sticky gloss tends to remain even after blending with component (B). Moreover, if the difference between the softening temperature of the component (B) and the component (B) is large (if this occurs, it becomes difficult to control the softening temperature by blending with the component CB), and the compatibility with the component (B) also decreases.

Furthermore, if the proportion of SiO2 units exceeds 5 mol%, it becomes difficult to control the softening temperature.

The silicone resin of component (A) can be obtained by hydrolyzing and condensing a silane represented by the following formula: % (R) 2Si (X) 2.

As the silane represented by RSi (X)-, the above-mentioned ones can be used.

Examples of the silane represented by SL (X) include tetramethoxysilane and tetraethoxysilane.

Examples of the silane represented by (R) 2Si (X) 2 include dimethyldimethoxysilane, dimethyljethoxysilane, diphenyldimethoxysilane, diphenyljethoxysilane, dimethyldichlorosilane, and diphenyldichlorosilane.

The amount of each silane used is 70 to 99 mol% for RSi(X)-, 5 to 0 mol% for Si(X)4, and (R)
2Si(X)2 is 30-1 mol%.

The hydrolysis/condensation reaction is carried out in an aromatic solvent such as toluene or xylene, an alcohol solvent such as methanol or ethanol, a ketone solvent such as acetone, or a mixed solvent thereof at 30 to 80°C for 10 to 2 hours. Do time.

The silicone resin of component (B) consists of R31O3/z units and Sin units.

The content ratio of each structural unit is 90 to 1 R5i O33 unit.
00 mol%, and 10 to 0 mol% of 5i02 units. If the proportion of RS iO3/2 units is less than 90 mol%, the resin tends to show no heat softening properties, making it difficult to adjust the softening point, which is not preferable.

The silicone resin of the component (B) can be obtained by hydrolyzing and condensing Ran.

RSi (X), J5J:BiSi (X)
As the silane represented by 4, the same ones as mentioned above can be used.

The hydrolysis/condensation method can be the same as that for the silicone resin component (A).

Components (A) and CB) can be mixed as a solution of the hydrolyzed/condensed product in toluene or the like, or as a solid after removing the solvent.

The mixing amount of components (A) and (B) is 100% of component (A).
It is preferable that the amount of component (B) is 0 to 1.000 parts by weight based on the weight parts. If the amount of component (B) mixed is too large, the solubility when dissolved in a solvent etc. may decrease, and this is not preferable for reasons of compatibility.

The additive for cosmetics of the present invention can contain various powders, oils, pigments, dispersants, etc. that are commonly used as constituent materials of cosmetics, in addition to the above-mentioned silicone resin which is an essential component.

[Effects of the Invention] In addition to being an additive for make-up cosmetics, the additive for cosmetics of the present invention can be used as a base material for hair styling, a protective coating agent for the hair surface cuticle, and a hand with excellent water resistance and wash resistance. It is also useful as an additive for creams and hand lotions.

The silicone resin, which is the main component of the cosmetic additive of the present invention, does not cause the blocking phenomenon that occurs with ordinary silicone resins, so it has a good feel when used in cosmetics.

In particular, when used for hair styling, it has less odor and has superior gloss and lubricity compared to conventional acrylic resins.

In the case of this hair setting agent, it is necessary to control the heat softening temperature of the resin at a constant level in order to maintain a constant setting force to hold the hair in the desired shape. Cosmetic additives of the present invention containing controllable silicone resins are useful.

[Example] The present invention will be explained below with reference to Examples and Comparative Examples.

In these examples, parts are by weight.

Synthesis Example 1 500 parts of toluene and 800 parts of toluene were placed in a reaction vessel equipped with a stirrer, condenser, thermometer, and heating and cooling jackets.
of methyltriisopropoxysilane was added and stirred to make it homogeneous. Next, 200 parts of city water was added dropwise to perform hydrolysis. Thereafter, the temperature was raised to 50°C while stirring, and stirring was continued for an additional 80 minutes while keeping the temperature constant under reflux. Next, the reaction solution was allowed to stand to separate an organic layer and an aqueous layer. 200 parts of city water was added to this and washed with water. Separation by standing still was performed again, and a pale yellow transparent C[(-
5103 parts 500 parts of a toluene solution of a silicone resin containing 100 mol% of 2 units was obtained.

Toluene was further added to this solution to obtain a solution (L-1) containing 30% by weight of silicone resin.

Synthesis Example 2 477 parts of toluene and 528 parts of toluene were placed in a reaction vessel equipped with a stirrer, condenser, thermometer, and heating and cooling jackets.
1 part of methyltriisopropoxysilane and 774 parts of dimethyldichlorosilane were charged and stirred to become uniform. Next, 200 parts of city water was added dropwise to perform hydrolysis. Thereafter, the temperature was raised to 50°C while stirring, and stirring was continued for an additional 80 minutes while keeping the temperature constant under reflux. Next, the reaction solution was allowed to stand to separate an organic layer and an aqueous layer. 200 parts of city water was added to this and washed with water. Static separation was performed again to obtain 500 parts of a toluene solution of a silicone resin containing 80 mol % of CH35l○3/2 units and 20 mol % of (CH3) 2SiO units, which was pale yellow and transparent. Toluene was further added to this solution to obtain a solution (L-2) containing 30% by weight of silicone resin.

Synthesis Example 3 477 parts of toluene and 594 parts of toluene were placed in a reaction vessel equipped with a stirrer, condenser, thermometer, and heating and cooling jackets.
1 part of methyltriisopropoxysilane and 38.7 parts of dimethyldichlorosilane were charged and stirred to become uniform. Next, 200 parts of city water was added dropwise to perform hydrolysis. Thereafter, the temperature was raised to 50° C. while stirring, and stirring was continued for an additional 80 minutes while keeping the temperature constant under reflux. Next, the reaction solution was allowed to stand to separate an organic layer and an aqueous layer. 200 parts of city water was added to this and washed with water. Static separation was performed again, and pale yellow transparent CH, Sj O3/2 was obtained.
90 mol% units and (C)13) 2SiO units 1
Toluene heavy liquid of silicone resin consisting of 0 mol% 500
I got the department. Toluene was further added to this solution to obtain a solution (L-3) containing 30% by weight of silicone resin.

Synthesis Example 4 477 parts of toluene and 396 parts of toluene were placed in a reaction vessel equipped with a stirrer, condenser, thermometer, and heating and cooling jackets.
1 part of methyltriisopropoxysilane and 155 parts of dimethyldichlorosilane were charged and stirred to become uniform. Next, 200 parts of city water was added dropwise to perform hydrolysis. Thereafter, the temperature was raised to 50° C. with stirring, and stirring was continued for an additional 80 minutes while keeping the temperature constant under reflux. Next, the reaction solution was allowed to stand to separate an organic layer and an aqueous layer. 200 parts of city water was added to this and washed with water. Static separation was performed again, and pale yellow transparent CH, SiO3/, unit 80 mol% and (CH3) 2SiOj 1st position 20
A toluene solution of silicone resin (L-4
) 500 copies were obtained.

Examples 1 to 6 and Comparative Example 1.2 L to L-4 were blended in the proportions shown in Table 1 and stirred to be uniform. Then 120'C/30T
The solid silicone resins P-1 to P-5 were obtained by heating under reduced pressure and removing the solvent. In addition, in the table, T represents CH3S t 03 parts 2 units, and D represents (CHl)
It represents 2SiO units, and the T/D ratio represents the molar ratio. The softening point was measured by the ring and ball method.

Table 1 Next, using the silicone resin and acrylic resin,
The formulations shown in Table 2 were evaluated as hair setting resins. Evaluations were made using the following methods regarding curl retention, moisture absorption, and sensory test feel, and the results are shown in Table 3.

Curl retention rate: A standard sample of hair with a length of 15 cm was curled using a shaping tool so that the length was approximately 8 cm. While applying the resin solution, place the hair on the former twice to ensure even distribution of the resin on the curled hair.
Rotated at 5r, p, m. After that, remove the hair for 24 hours.
The curl was hung on the utensil in a cabinet at 90% relative humidity at °C and left for 3 hours, its length was measured, and the curl retention rate was determined using the following formula.

Softness, combability, stickiness and gloss were evaluated. The display is as shown in Table 2.

Moisture absorption: Evaluated by moisture absorption (%) when left in an atmosphere with relative humidity of 40%, 60% and 80% for 3 hours.

Feeling based on sensory test: According to the following criteria, the curl retention rate under high temperature and high humidity conditions is equivalent to or better than conventional acrylic ester polymers, and the hygroscopicity is low under both low and high humidity conditions. It can be seen that there is less stickiness due to moisture absorption.

In addition, in terms of feel, the gloss and slippage (<stickability) are improved compared to acrylic acid ester bombers.

Furthermore, since it is a silicone resin, it has almost no odor, which makes it an excellent additive for cosmetics.

Procedural amendment Heisei

Claims (2)

[Claims] (1) A cosmetic additive characterized by containing a silicone resin containing 70 mol% or more of RSiO3/2 units (in the formula, R represents a substituted or unsubstituted monovalent hydrocarbon group). (2) The silicone resin contains (A) 70 to 99 mol% of RSiO3/2 units, SiO_
A silicone resin consisting of 5 to 0 mol% of 2 units and 30 to 1 mol% of (R)_SiO units (the meaning of R in the formula is the same as above), and (B) 90 to 100 mol% of RSiO3/2 units. and S
The additive for cosmetics according to claim 1, which is a mixture of a silicone resin comprising 10 to 0 mol% of iO_2 units.