CN114848538A

CN114848538A - Clear solid powder color-locking synergistic double-wrapping zinc oxide composition

Info

Publication number: CN114848538A
Application number: CN202210456559.XA
Authority: CN
Inventors: 喻竟
Original assignee: Shanghai Yongxi Information Technology Co ltd
Current assignee: Shanghai Yongxi Information Technology Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-08-05

Abstract

The invention discloses a LIGHT-TUNE dual-coating zinc oxide composition with synergistic color locking of clear solid powder, which comprises the following components in part by weight: at least one zinc oxide, said zinc oxide comprising zinc oxide of different particle size; at least one polyurethane-7, said polyurethane-7 comprising at least one isocyanate A1HMDI and one hydroxyl-functionalized polyorganosiloxane a2 and a polymer obtained by reaction with a polyester polyol polymer A3; said polymethylsilicon resin comprising at least one methyl MQ-type silicone resin; the invention has the beneficial effects that: when the emulsion is applied to a water-in-oil formula, a very strong spatial network structure is formed, the emulsion can be very well attached to the stratum corneum on the skin surface, an invisible, durable, skin-attached and breathable spatial structure can be formed on the skin surface, the light permeability is enhanced, and the light weight characteristic is kept. Obviously improves the whole anti-darkness performance of the product. Can also obviously improve the color development of the product and improve the darkness performance of the product.

Description

Clear solid powder color-locking synergistic double-coating zinc oxide composition

Technical Field

The invention relates to the technical field of cosmetics, in particular to a LIGHT-TUNE dual-coating zinc oxide composition with synergistic color locking of clear solid powder.

Background

As for improving the durability of foundation products including but not limited to foundations, BB creams, facial make-up creams, sun screens, and other texture products on the skin and the functional performance state of the products after acting on the skin, most of the current technologies in the field use a single powder surface treatment such as titanium dioxide and zinc oxide, and adjust the fineness, oil control ability, and durability of the foundation based on the ratio of different particle sizes. However, the single surface powder treatment technology is likely to cause incomplete powder wrapping, and the regularity of the outer layer structure of the powder is weak. Meanwhile, the product needs to meet the requirements of oil control and avoiding the heavy feeling brought by the powder and the false face feeling caused by whitening, and the product is difficult to achieve only by the proportion of the powder with different particle sizes.

In the process of the same addition amount, the zinc oxide has more obvious clear feeling than the titanium dioxide in the formula, and the zinc element has stronger bacteriostatic ability on grease secreted in pores. By the double-coating zinc oxide technology, on the basis of not additionally increasing the oil content and the solid content of the whole powder, more zinc oxide in relative amount can be introduced into the formula to improve the clear feeling, the degree of conformity and the persistence of the product, and meanwhile, the product can keep strong fluidity. Because the double-coated zinc oxide has a more stable and regular structure, the product can still keep the initial shape in brightness along with the volatilization of the grease, and the integral darkness resistance of the product is obviously improved. In different particle size intervals, double-coated zinc oxide with the preferable size of 200 nm to 500 nm can remarkably improve the multilayer superposition of products and still keep the characteristics of lightness and thinness.

Disclosure of Invention

In view of the above disadvantages in the prior art, the present invention aims to provide a LIGHT-TUNE double-coated zinc oxide powder composition with synergistic color-locking effect. The invention is realized by the following technical scheme.

A synergistic dual-wrapped zinc oxide composition with clear, transparent, solid powder color-locking is used for making up facial composition;

a) at least one zinc oxide, which can be obtained by direct and indirect processes.

b) At least one polyurethane-7A), the polyurethane-7A) being obtainable by reacting an isocyanate A1HMDI with a hydroxyl-functionalized polyorganosiloxane A2 and with a polyester polyol polymer A3;

c) polymethyl silicone resin B).

The zinc oxide is preferably produced by an indirect method using a zinc ingot as a raw material, a direct method using a zinc ore as a raw material, and a wet method, and has zinc oxide particles having different particle sizes. From 20 nm to 100 nm. From 100 nm to 900 nm. There are 900 nanometers to 10 microns. Preferably 200 nm to 500 nm.

Preferably, the polyurethane includes monoisocyanates R-N ═ C ═ O and diisocyanates O ═ C ═ N-R-N ═ C ═ O and polyisocyanates, etc., and HMDI hexamethylene diisocyanate is preferably used.

Preferably, the polyurethane comprises a hydroxyl-functionalized polyorganosiloxane having the formula HO [ (CH3)2SiO ] nH, a linear polymer having repeating siloxane linkages as the backbone and methyl groups as pendant groups and terminated with hydroxyl groups.

As preferred, the prepolymer a1) used in the preparation of the polyurethane is preferably obtainable by reacting one or more polyols selected from polyether polyols, polycarbonate polyols, polyether polycarbonate polyols and/or polyester polyols with polyisocyanates.

Preferably, the polymethyl silicone resin B) is a methyl MQ type silicone resin, wherein the methyl MQ type silicone resin is a novel silicone material having a three-dimensional nonlinear structure in which the molecules thereof are structured with Si — O bonds as a skeleton.

Preferably, the methyl MQ type silicon resin has a structural formula of [ (CH3)3Si01/2] a [ Si04/2] b, wherein [ (CH3)3SiO1/2] is a monofunctional siloxane chain link M, [ SiO4/2] is a tetrafunctional siloxane condensed chain link Q, the molar ratio of the M to the Q chain link is 0.6-0.9, the molar mass is generally 1000-8000, and the ratio of the amount of the M chain link to the Q chain link in the molecular structure and the structure determine the property and the application range of the silicon resin.

Preferably, the solid component of polyurethane-7A) represents from 0.1% to 5% by weight of the cosmetic composition; the solid component in the polymethyl silicone resin B) accounts for 1 to 10 percent of the weight of the cosmetic composition.

Preferably, the pigments include zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide.

Preferably, the cleaning agent also comprises at least one of volatile silicone oil, volatile alkane, water-in-silicone oil emulsifier, polyol, surfactant, preservative, essence, humectant and active matter.

Preferably, the double-coated cosmetic composition comprises a fixed powder color-locking synergistic effect, and is applied to skin makeup fixation.

The invention has the beneficial effects that:

the cosmetic composition forms a very strong spatial network framework through organic combination of macromolecular silicone resin and siloxane groups in macromolecular polyurethane-7, and the framework simultaneously contains soft polyurethane groups and nonpolar silicon hydrogen bonds, so that the cosmetic composition can have very good conformability with a cuticle on the surface of skin, and can form a hidden, lasting, skin-attached and breathable spatial structure on the surface of the skin like a net, and the spatial structure also enhances the light permeability.

Meanwhile, the powder in the formula is doubly treated by the silicone resin and the polyurethane-7, along with the volatilization of volatile grease, a large amount of polyurethane subjected to surface treatment of the powder, the silicone resin and a reticular macromolecular polymer such as the silicone resin in the formula are interwoven by stronger intermolecular acting force, and finally the treated powder can be tightly embedded in the interpenetrating network film, is soft and skin-friendly and can be firmly attached to the surface of the skin, and finally the durability of the product is improved from a macroscopic angle. Because the double-coated zinc oxide has a more stable and regular structure, the product can still keep the initial shape in brightness along with the volatilization of the grease, and the integral darkness resistance of the product is obviously improved. Can also obviously improve the color development of the product and improve the darkness performance of the product. In the aspect of practical application, by the double-coating zinc oxide technology, on the basis of not additionally increasing the oil content and the solid content of the whole powder, more zinc oxide with relative quantity can be introduced into the formula to improve the product, clear feeling, fit degree and durability, and meanwhile, the product can keep strong fluidity. In different particle size intervals, double-coated zinc oxide with the preferable size of 200 nm to 500 nm can remarkably improve the multilayer superposition of products and still keep the characteristics of lightness and thinness.

Drawings

FIG. 1 is a schematic view of the structural formula of an isocyanate compound in the present invention;

FIG. 2 is a schematic view of the structural formula of polyorganosiloxane according to the present invention;

FIG. 3 is a schematic structural diagram of a polyester polyol according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention easier to clearly understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

A synergistic dual-coating cosmetic composition for making up facial composition comprises clear, solid powder, color-locking agent, and pigment;

c) polymethyl silicone resin B).

Zinc oxide inorganic white pigment. The tinting strength is inferior to that of titanium dioxide and lithopone. Widely used for coloring foundation and sunscreen. In addition, nano zinc oxide is a stable compound, can provide broad-spectrum ultraviolet protection (UVA and UVB), has antibacterial and anti-inflammatory effects, and is the safest and effective component in the evaluation of the sunscreen agents in all countries. Their extremely small size, which makes them more chemically active, may also be absorbed by the body and thus potentially harmful to the body and the environment, has been controversial for the use of nanoscale zinc oxides.

Preferred examples of the polyisocyanate include monoisocyanates R-N ═ C ═ O and diisocyanates O ═ C ═ N-R-N ═ C ═ O and polyisocyanates, and HMDI hexamethylene diisocyanate is preferably used.

Suitable organic polyisocyanates are the aliphatic, aromatic or cycloaliphatic polyisocyanates known to the person skilled in the art having an NCO functionality of greater than or equal to 2.

Non-limiting examples of such polyisocyanates are 1, 4-butylidene diisocyanate, 1, 6-Hexamethylene Diisocyanate (HDI), isophorone diisocyanate (IPDI), 2,4 or2, 4, 4-trimethylhexamethylene diisocyanate, bis (4, 4-isocyanatocyclohexyl) methane isomers or mixtures of these isomers, 1, 4-cyclohexylidene diisocyanate, 4-isocyanatomethyl-1, 8-octane diisocyanate (nonane triisocyanate), 1, 4-phenylene diisocyanate, 2,4 or2, 6-toluene diisocyanate, 1, 5-naphthylidene diisocyanate, 2 or2, 4 or 4, 4-diphenylmethane diisocyanate, 1,3 or 1, 4-bis (2-isocyanatoprop-2-yl) benzene (TMXDI), 1, 3-bis (isocyanatomethyl) benzene (XDI) and alkyl 2, 6-diisocyanatohexanoate having C1-C8-alkyl groups (lysine diisocyanate).

In addition to the polyisocyanates mentioned above, it is also possible to use modified diisocyanates having a functionality of 2 or more with the structure uretdione, isocyanurate, urethane, allophanate, biuret, iminooxadiazinedione or oxadiazinetrione, and also mixtures of these components in proportions.

Hexamethylene diisocyanate, isophorone diisocyanate, and mixtures of the foregoing diisocyanates are particularly preferred.

Preferably, the hydroxyl-functionalized polyorganosiloxane has the formula HO [ (CH3)2SiO ] nH, and is a linear polymer having repeating siloxane linkages as the main chain and methyl groups as pendant groups and terminated with hydroxyl groups.

The composition according to the invention comprises at least one polysiloxane-polyurethane-polyester polymer, which is the product of the reaction of a hydroxyl-functionalized polyorganosiloxane, preferably comprising two or more hydroxyl groups, with a diisocyanate compound. Typically, the hydroxyl-functionalized polyorganosiloxane corresponds to a structure having the formula I: wherein R is independently at each occurrence selected from the group consisting of a hydrogen atom, a hydroxyl group, and an optionally substituted hydrocarbon group containing 1 to 10 carbon atoms, and in particular selected from the group consisting of a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl-alkyl, or alkyl-aryl group; preferably, R is selected from an optionally substituted linear, cyclic or branched C1-6 alkyl or alkenyl group including, but not limited to, the groups methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, hexyl, cyclohexyl, vinyl, C1-8 allyl or aryl, arylalkyl or alkyl-aryl including, but not limited to, phenyl, benzyl, tolyl, xylyl; wherein each of the above groups R may be optionally substituted by: one or more heteroatoms including oxygen, nitrogen, phosphorus and halogen, especially fluorine, as represented by fluoroalkyl (perfluoroalkyl) groups such as monofluoromethyl, difluoromethyl, trifluoromethyl, perfluorophenyl and C1-6 substituted aminoalkyl groups including those corresponding to the formulae- (CH2)1-6-NRN and- (CH2)1-6-NRN (CH2)1-6-NRN, where RN is typically hydrogen, but may also be methyl, ethyl, propyl or equivalent groups, polyether groups including but not limited to polyethylene oxide groups corresponding to the formula- (CH2CH2O) n-, propylene oxide groups corresponding to the formula-CH (CH3) CH2O) n-, combinations of such groups and amine oxide, phosphate, hydroxyl, ester or carboxylate functional groups or equivalents, where R may contain an additional group-L-OH, wherein L is a bond or a linking group; preferably, L is a linking group selected from divalent hydrocarbons having 1 to 10 carbon atoms, including divalent alkyl, alkenyl, alkynyl, aryl, alkyl-aryl or aryl-alkyl groups, such as C1-10 alkyl, including but not limited to divalent groups having the formula- (CH2)1-10-, preferably- (CH2)1-6-, more preferably, L is-CH 2CH2 — CH2-, and wherein n is an integer from 0 to 5000, preferably from 1 to 200, more preferably from 10 to 100, even more preferably from 10 to 50; preferably, R represents methyl groups occurring at least once or more, more preferably R represents methyl groups occurring wholly or quasi-wholly, which means that R represents methyl groups occurring more than 90%, in particular more than 95%, even more than 98%.

According to one embodiment of the invention, for example, the hydroxyl-functionalized polyorganosiloxane comprises a polymethylsiloxane corresponding to the structure of formula Ib, according to a preferred embodiment of the invention.

Preferably, the polyester polyol is a polymer obtained by polycondensation of a polyhydric alcohol and a polybasic acid, and includes polycarbonate, polyhydric alcohol, polyether polycarbonate, polyhydric alcohol, or polyester polyol; the excess of alcohol ranges from 5 to 20 mole percent depending on the polyol type, polyester molecular weight, process conditions, and the like. As preferred, the prepolymer a1) used in the preparation of the polyurethane is preferably obtainable by reacting one or more polyols selected from polyether polyols, polycarbonate polyols, polyether polycarbonate polyols or polyester polyols with polyisocyanates, as will also be explained in detail below.

Particularly preferably, the polyurethanes are obtained by using polymeric polyether polyols or polymeric polycarbonate polyols or polyether-polycarbonate polyols or polyester polyols, each of these polymers having a number average molecular weight of preferably from about 400 to about 6000g/mol (here and for the following molecular weight data, the molecular weight is determined by gel permeation chromatography in tetrahydrofuran at 23 ℃ C. against polystyrene standards). Their use in the preparation of polyurethanes or polyurethane prepolymers will, as a result of reaction with polyisocyanates, lead to the formation of corresponding polyether or polycarbonate or polyether-polycarbonate segments or polyester segments in the polyurethanes having the corresponding molecular weights of these segments. Particularly preferred according to the invention are polyurethanes obtained from polymeric polyether diols or polymeric polycarbonate diols or polyether-polycarbonate polyols or polyester polyols having a linear structure.

The aqueous polyurethanes A) according to the invention are preferably linear molecules, but may also be branched.

The number average molecular weight of the aqueous polyurethane A) preferably used according to the invention is, for example, about 1000-200000, preferably from 5000 to 150000.

Preferably, the solid component of polyurethane-7A) represents from 0.1% to 5% by weight of the cosmetic composition; the solid component in the polymethyl silicone resin B) accounts for 1 to 18 percent of the weight of the cosmetic composition.

Examples of solid silicone resins of the MQ type of the trimethylsiloxysilicate type include those sold under the catalogue SR1000 by General Electric company, under the catalogue TMS 803 by Wacker company, under the name "KF 7312J" by Shin-Etsu company, under the names "DC 749", "DC 593" by Dow Corning company, and examples of silicone resins containing siliconoxysilicate MQ units also include phenylalkylsiloxysilicate resins such as phenylpropyl dimethylsiloxysilicate (phenylsilicoxane 151) sold by General Electric company. In particular, the preparation of this resin is described in patent US 5817302.

Examples of T-type polysiloxane resins include polysilsesquioxanes having the formula (RSiO3/2) X (T units), where X is greater than 100, and such that the group R is an alkyl group having 1 to 10 carbon atoms, where the polysilsesquioxane may also contain Si-OH end groups. Preferably, polymethylsilsesquioxane resins in which R represents a methyl group may be used, for example: those sold by Wacker corporation under catalog Resin MK, such as Belsil PMS MK: polymers comprising recurring CH3SiO3/2 units (T units), which may also comprise up to 1% by weight of (CH3)2SiO2/2 units (D units) and have an average molecular weight of about 10000g/mol, or those sold under the catalog KR-220L by the company SHIN-ETSU, which consist of 11T units having the formula CH3SiO3/2 and having Si-OH end groups (silanols);

a radical unit and having Si-OH end groups; or those sold under the catalog KR-251 which contain 88% T units and 12% D dimethyl units and have Si-OH end groups. As resins comprising MQT units, in particular those cited in document US5110890 are known. A preferred form of MQT type resin is MQT-propyl resin (also known as MQTPr). In particular, such resins that can be used in the compositions according to the invention are those described and prepared in application WO2005/075542, the content of which is incorporated herein by reference. Preferably, the MQ-T-propyl resin comprises the following units:

(i)(R13SiO1/2)a；

(ii)(R22SiO1/2)b；

(iii)(R3SiO1/2)c；

(iv)(SiO4/2)d；

wherein R1, R2 and R3 independently represent a hydrocarbyl group (particularly an alkyl group) having 1 to 10 carbon atoms, a phenyl group, phenylalkyl group or hydroxyl group, preferably an alkyl group or phenyl group having 1 to 8 carbon atoms, a is 0.05 to 0.5, b is 0 to 0.3, c is greater than zero, d is 0.05 to 0.6, a + b + c + d is 1, and a, b, c and d are mole fractions, with the proviso that more than 40 mole% of the groups R3 of the silicone resin are propyl groups.

The silicone resins which can be used according to the invention can be obtained by a process comprising reacting A) with B):

A) MQ resins comprising at least 80 mol% of (R13SiO1/2) a and (SiO4/2) d units, R1 representing an alkyl, aryl, carbinol or amino group having from 1 to 8 carbon atoms, a and d being greater than zero, the ratio a/d being from 0.5 to 1.5; and

B) propyl T resin comprising at least 80 mol% of (R3SiO1/2) c units, R3 representing an alkyl, aryl, carbinol or amino group having 1 to 8 carbon atoms, c being greater than zero, with the proviso that at least 40 mol% of the R3 groups are propyl groups, wherein the A/B mass ratio is 95:5 to 15:85, preferably the A/B mass ratio is 30: 70. In particular, the composition according to the invention comprises a silicone resin (preferably MQ) in a concentration ranging from 1 to 20% by weight, preferably from 5 to 10% by weight, relative to the total weight of the composition.

Preferably, the pigments include zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide;

examples of inorganic pigments useful in the present invention include oxides of titanium, zirconium or cerium, and oxides of zinc, iron or chromium, ferric blue, manganese violet, ultramarine blue and chromium hydrates;

examples of organic pigments which can be used in the present invention include carbon black, pigments of the D & C type, paints containing cochineal, barium, strontium, calcium, aluminium or Diketopyrrolopyrroles (DPP) as described in documents EP-A-542669, EP-A-787730, EP-A-787731 and WO-A-96/08537.

The pigment used in the cosmetic composition according to the present invention may be surface-treated with a hydrophobic treatment agent;

the hydrophobic treatment agent may be selected from the group consisting of polysiloxanes, such as polymethylsiloxanes, polydimethylsiloxanes, perfluoroalkylsilanes, alkylalkoxysilanes, fatty acids (such as stearic acid), metal soaps (such as aluminum dimyristate), aluminum salts of hydrogenated tallow acyl glutamate, perfluoroalkyl phosphates, perfluoroalkylsilanes, perfluoroalkylsilazanes, polyoxides of hexafluoropropylene, polyorganosiloxanes containing perfluoroalkyl perfluoropolyether groups, amino acids, N-acyl amino acids or salts thereof, lecithin, isopropyl tristearate titanate, and mixtures thereof;

according to a preferred embodiment, the hydrophobic treatment agent is selected from alkylalkoxysilanes, in particular trimethylsiloxysilicates.

Addition of conventional cosmetic ingredients:

the composition according to the invention may also comprise any conventional cosmetic ingredients, which may be chosen in particular from antioxidants, fragrances, preservatives, neutralizing agents, surfactants, sun filters, vitamins, moisturizers, self-tanning compounds, anti-wrinkle actives, emollients, hydrophilic or lipophilic actives, anti-radical agents, deodorants, sequestering agents and mixtures thereof.

Preferably, the cosmetic also comprises at least one of volatile silicone oil, volatile alkane, water-in-silicone oil emulsifier, polyol, surfactant, preservative, essence, humectant and active matter. Physiologically acceptable Medium the composition according to the invention comprises a physiologically acceptable and preferably cosmetically acceptable medium, that is to say it does not have any harmful side effects, in particular does not cause unacceptable redness, temperature, pain or tingling to the cosmetic user. In particular, the physiologically acceptable medium may comprise at least one oil.

In the sense of the present invention, "oil" means a compound which is liquid at room temperature (25 ℃) and which, when introduced into water at a concentration of at least 1% by weight at 25 ℃, is completely insoluble in water or soluble in water at a rate of less than 10% by weight relative to the weight of the oil introduced into the water.

The oil may be volatile or non-volatile, polar or non-polar. The skilled person will note that the oil forming the physiologically acceptable medium of the composition of the invention is selected so that it is compatible with the acrylate polysiloxane polymer and the polysiloxane resin it contains.

In particular, examples of oils that can be used in the composition according to the present invention include hydrocarbon oils, silicone oils, and fluorosilicone oils, among which the composition according to the present invention preferably comprises at least one hydrocarbon oil. "Hydrocarbon oil" means an oil containing only hydrogen atoms and carbon atoms, which may be volatile, and in particular has a flash point of from 40 ℃ to 120 ℃, preferably from 40 ℃ to 55 ℃, preferably from 40 ℃ to 50 ℃. In particular, the volatile hydrocarbon oil may be chosen from volatile hydrocarbon oils having from 8 to 16 carbon atoms and mixtures thereof, in particular: -C8-C16 branched alkanes, such as C8-C16 isoalkanes (iso-alkanes), also known as isoalkanes (isoparaffins), isododecane, isodecane, isohexadecane, and also oil-linear alkanes, for example sold under the trade name Isopars or permethyls, such as n-dodecane (C12) and tetradecane (C14) and mixtures thereof, sold by Sasol under the catalogues parapol 12-97 and parapol 14-97, respectively, mixtures of undecane-tridecane (C tiol ut), mixtures of n-undecane (C11) and n-tridecane (C13) obtained in examples 1 and 2 of application WO2008/155059 from Cognis, and mixtures thereof. Preferably, the volatile hydrocarbon oil is isododecane. The hydrocarbon oil may be a non-volatile hydrocarbon, preferably polar, in particular the non-volatile oil may be an ester oil, in particular having from 18 to 70 carbon atoms, examples including mono-, di-and tri-esters, in particular the ester oil may be hydroxylated. Preferably, the non-volatile ester oil may be selected from: monoesters containing a total of 18 to 40 carbon atoms, in particular monoesters having the formula R1COOR2, wherein R1 represents the remainder of a straight-chain or branched fatty acid containing 4 to 40 carbon atoms and R2 represents a hydrocarbon chain (in particular branched) containing 4 to 40 carbon atoms, with the proviso that R1+ R2 is 18, for example shea butter (Purcellin) oil (cetostearyl octanoate), isononyl isononanoate, C12-C15 alcohol benzoate, ethyl 2-hexyl palmitate (ethyl 2-hexylpalmitate), octyldodecanol pivalate, octyl 2-dodecanol stearate, octyl-2-dodecanol erucate, isostearyl isostearate, octyl-2-dodecanol benzoate, caprylate of an alcohol or polyol, decanoate or ricinoleate, isopropyl myristate, isopropyl palmitate, isopropyl myristate, isopropyl palmitate, and the like, Butyl stearate, hexyl laurate, isooctyl 2-palmitate, 2-hexyldecanol laurate, 2-octyldecanol palmitate, 2-octyldodecanol myristate, 2-diethylhexyl succinate. Preferably, these are esters of formula R1COOR2, wherein R1 represents the remainder of a linear or branched fatty acid comprising 4 to 40 carbon atoms and R2 represents a hydrocarbon chain (in particular branched) comprising 4 to 40 carbon atoms, such that R1+ R2 is 18. Preferably, the esters contain a total of 18 to 40 carbon atoms. Examples of preferred monoesters include isononyl isononanoate; diesters, in particular, which contain 18 to 60 carbon atoms in total, in particular 18 to 50 carbon atoms in total. In particular, diesters of carboxylic diacids and monoalcohols, such as preferably diisostearyl malate, may be used. Alternatively, the diester may be a diester of a diol and a carboxylic acid monoacid, such as neopentyl glycol diheptanoate or polyglycerol-2 diisostearate (in particular such as the compounds sold by the company Alzo under the catalogue DERMOL DGDIS);

triesters, in particular those containing a total of from 35 to 70 carbon atoms, in particular triesters such as carboxylic triacids, such as triisostearyl citrate, or tridecyl trimellitate, or triesters of diols and carboxylic monoacids (such as polyglycerol-2 triisostearate);

tetraesters, in particular tetraesters having a total of 35 to 70 carbon atoms, such as tetraesters of pentaerythritol or tetraesters of polyglycerol and carboxylic mono-acids, for example pentaerythritol tetrapelargonate, pentaerythritol tetraisostearate, pentaerythritol tetraisononanoate, glyceryl tridecyl-2 tetradecanoate (glyceryl tri-2 tetradecanoate), polyglycerol-2 tetraisostearate.

Preferably, the double-coated cosmetic composition comprises a fixed powder color-locking synergistic effect and is applied to skin makeup fixation.

Table one: comparative example and example constitution

The examples and comparative examples of the present invention can be prepared as follows: at a stirring speed of 500-600rpm, the polyurethane A according to the invention

1 adding the oil phase under stirring to participate in emulsification, silicone polymer B), (

P620B) adding cyclomethicone (1:4), slightly heating and continuously stirring to uniformly disperse the cyclomethicone; the formulation oil phase was added before emulsification. Fully dissolving sodium chloride, 1, 2-hexanediol, glycerol and ethylhexylglycerin in a water phase, uniformly dispersing an oil phase at normal temperature, stirring the oil phase, and adding the oil phase into the water phase to complete emulsification.

Table 2: the examples or comparative examples in the present invention all have the compositions as listed in the following table:

evaluation experiment:

each formulated product was applied to the skin separately and after waiting to dry completely, each item was scored by an evaluation panel consisting of trained cosmetic technicians, with a minimum score of 1 being the worst and a maximum score of 5 being the best. Since the scores are relative, there is no comparability between the scores of the respective groups.

For the "leave-on" experiment, the skin was subjected to a standardized washing procedure. The skin softened in water for 15 minutes was rinsed for 2 minutes by washing the skin with a 12 wt% sodium lauryl sulfate solution, rinsed thoroughly with warm water, and blown dry on a cold air screen.

A sample of foundation was applied in the area of 2X2cm, and the "foundation evaluation" experiment was performed in a special climate laboratory with a relative humidity of > 60%. The temperature of the chamber was 25 ℃. Testing conditions, smearing feeling, smearing 2min after smearing, and feeling evaluation 10min after smearing.

Table 3: texture & smear evaluation results for comparative example components

Table 4: evaluation results after application of comparative example component

Table 5: evaluation result of comparative example component 2-10min after coating

The experiments prove that compared with other polyurethane formulas, the formula using only polyurethane-7 has better effect and is stronger than other polyurethane products, and meanwhile, the formula using polyurethane-7A) and powder B) of silicone resin polymer has obviously improved makeup-sustaining effect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The clear, transparent and solid powder color-locking synergistic double-wrapped zinc oxide composition is characterized by comprising the following components in parts by weight:

c) polymethyl silicone resin B).

The polyurethane-7 includes monoisocyanate R-N ═ C ═ O and diisocyanate O ═ C ═ N-R-N ═ C ═ O, polyisocyanate, and the like, and HMDI hexamethylene diisocyanate is preferably used. Comprises hydroxyl-functionalized polyorganosiloxane with the structural formula HO [ (CH3)2SiO ] nH, which is a linear polymer with repeated siloxane bonds as main chains, methyl groups as side groups and hydroxyl groups for termination. Prepolymer a1) used in the preparation of the polyurethane is preferably obtainable by reacting one or more polyols selected from polyether polyols, polycarbonate polyols, polyether polycarbonate polyols and/or polyester polyols with polyisocyanates.

2. The clear solid powder color-locking synergistic double-wrapped zinc oxide composition according to claim 1, which is characterized in that: the polyurethane-7 is at least one isocyanate HMDI.

3. The clear solid powder color-locking synergistic double-wrapped zinc oxide composition according to claim 2, which is characterized in that: at least one polyester polyol polymer.

4. The clear solid powder color-locking synergistic double-wrapped zinc oxide composition according to claim 1, which is characterized in that: the zinc oxide is prepared by an indirect method using zinc ingots as a raw material, a direct method using zinc ores as a raw material and a wet method, and has zinc oxide with different particle sizes. From 20 nm to 100 nm. From 100 nm to 900 nm. There are 900 nanometers to 10 microns. Preferably 200 nm to 500 nm. Preferably, the pigments include zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide.

5. The clear solid powder color-locking synergistic double-wrapped zinc oxide composition according to claim 1, which is characterized in that: the polymethyl silicone resin B) is methyl MQ type silicone resin, wherein the methyl MQ type silicone resin is a novel organosilicon material with a three-dimensional nonlinear structure, and the molecules of the novel organosilicon material are formed by taking Si-O bonds as frameworks. The structural formula of the methyl MQ type silicon resin is [ (CH3)3Si01/2] a [ Si04/2] b, wherein [ (CH3)3SiO1/2] is a monofunctional siloxane chain link M, [ SiO4/2] is a tetrafunctional siloxane condensation chain link Q, the molar ratio of the M chain link to the Q chain link is 0.6-0.9, the molar mass is generally 1000-8000, and the ratio and the structure of the amount of the M chain link to the Q chain link in the molecular structure determine the property and the application range of the silicon resin.

6. The clear solid powder color-locking synergistic double-wrapped zinc oxide composition according to claim 1, which is characterized in that: the solid component in the polyurethane-7A) accounts for 0.1 to 5 percent of the weight of the cosmetic composition; the solid component in the polymethyl silicone resin B) accounts for 1 to 10 percent of the weight of the cosmetic composition.

7. Use of the clear solid powder color-locking synergistic double-wrapped zinc oxide composition according to any one of claims 1 to 6 applied to the skin for fixing the makeup.

8. A method of skin color fixing comprising applying the composition of claims 1-7 to the skin.