CN113350223A

CN113350223A - Tearable mask composition

Info

Publication number: CN113350223A
Application number: CN202010137471.2A
Authority: CN
Inventors: 刘慧琳; 谢晨
Original assignee: Covestro Deutschland AG
Current assignee: Covestro Deutschland AG
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2021-09-07

Abstract

The invention relates to a tear-off mask composition, in particular to a dry-tear-off mask composition, a preparation method thereof, application thereof and a using method thereof. The tear-off mask composition comprises the following components: a) at least one aqueous polyurethane dispersion comprising a polyurethane and water; b) at least one liquid inverse emulsion thickener; c) at least one non-silicone oil type of fat; and d) optionally an additive; wherein the weight ratio of the polyurethane is 8-29 wt%, the weight ratio of the liquid reverse emulsion thickener is 0.8-6 wt%, and the weight ratio of the non-silicone oil grease is 1-8 wt%, and the weight ratio is based on the weight of the mask composition as 100 wt%.

Description

Tearable mask composition

Technical Field

The invention relates to a tear-off mask composition, a preparation method thereof, and application and using methods thereof.

Background

The facial mask is various in types, and there are a patch type facial mask, a water-washing facial mask (including a paste-like water-washing facial mask, a cream-like water-washing facial mask and a gel-like water-washing facial mask), a leave-on sleep facial mask and a tear-off facial mask (a peelable facial mask).

The application method of the tear-off facial mask comprises uniformly applying liquid in the form of emulsion, paste or spray on the face, waiting for about 15-20 minutes, and manually tearing off the facial mask from the face. The tearing mask can clean pores and redundant grease. The tearing mask can be divided into two types according to different using modes: dry tear masks and wet tear masks. The dry-tearing mask refers to a mask which can be directly and completely torn off after being dried; the wet tearing mask refers to a mask which needs to be rewetted by water after being dried so as to be completely torn off. The dry-tear mask is convenient to use and is popular with consumers.

In order to ensure that the dry-tear mask can form a continuous film on the skin surface in a short time and the film does not break during the tearing process, the film-forming agent in the dry-tear mask is an extremely important component. The film should have good elasticity (i.e., elongation at break), good tensile strength, and adequate adhesion to the skin. The polyvinyl alcohol or polyvinylpyrrolidone film forming agent can form strong adhesive force with the skin, so that the skin of the facial mask containing the polyvinyl alcohol or polyvinylpyrrolidone film forming agent has strong tight feeling after being dried, has very strong pain feeling in the process of dry tearing of the facial mask, and is poor in consumer experience. Masks containing acrylic film formers form films that are hard and easily broken, and masks cannot be completely dry-torn from the skin surface, even if the mask is rewetted with water. The polyurethane film forming agent has good elasticity, and after the mask containing the polyurethane film forming agent is formed on the surface of skin, the mask can be completely torn and removed from the surface of the skin after being rewetted by water, and the mask is painless. For example, CN104352359A discloses a peelable mask based on an aqueous polyurethane dispersion, mentioning the need to be wetted with water to enable tear removal. CN104069052B discloses a Q-elasticity memory facial mask with effect of imitating eggshell membrane, which is also wet with water before peeling off and can be torn off. CN107823099A discloses an anti-acne and anti-acne mask, wherein a polyurethane film forming agent is matched with a mask cloth for use, and the mask belongs to a patch type mask. CN108135805A discloses a beauty mask, relating to a beauty mask with water-insoluble substrate impregnated with whitening particles and film-forming polymer, which has instant whitening effect and also belongs to the mask combination of a patch mask and a polymer film-forming agent.

Therefore, the above-mentioned mask cannot achieve a dry-tear effect, and it is desirable to develop a dry-tear mask which can be completely torn off from the skin surface without wetting with water and which is not painful to the user.

Disclosure of Invention

The invention aims to provide a tear-off mask composition, in particular a dry-tear-off mask composition, a preparation method thereof, and application and use methods of the mask composition.

The tear-off mask composition according to the present invention comprises the following components:

a) at least one aqueous polyurethane dispersion comprising a polyurethane and water;

b) at least one liquid inverse emulsion thickener;

c) at least one non-silicone oil type of fat; and

d) optionally an additive;

wherein the weight ratio of the polyurethane is 8-29 wt%, the weight ratio of the liquid reverse emulsion thickener is 0.8-6 wt%, and the weight ratio of the non-silicone oil grease is 1-8 wt%, and the weight ratio is based on the weight of the mask composition as 100 wt%.

According to one aspect of the present invention, there is provided a method of preparing a tear-off mask composition as provided herein, the mask composition being obtained by mixing component a) an aqueous polyurethane dispersion, component b) a liquid inverse emulsion thickener, component c) a non-silicone oil-based oil and fat, and optionally component d) an additive.

According to yet another aspect of the present invention, there is provided the use of a tearable mask composition provided according to the present invention applied to the skin for the treatment of the skin.

According to a further aspect of the present invention, there is provided a method of skin care comprising applying the tear-off mask composition provided herein to a skin surface, drying to form a film, and removing the film from the skin.

The tearable mask composition can form a layer of tough continuous elastic film, the adhesive force between the film and the skin is proper, the mask can be completely torn and removed from the surface of the skin without wetting the film in advance when the film is torn and removed from the surface of the skin, and the skin of a user has no pain and no obvious greasy feeling. In addition, the tear-off mask composition of the present invention dries quickly to a film after being applied to the skin, greatly reducing the time the user waits for the mask to dry.

Detailed Description

The invention provides a tear-off mask composition, which comprises the following components: a) at least one aqueous polyurethane dispersion comprising a polyurethane and water; b) at least one liquid inverse emulsion thickener; c) at least one non-silicone oil type of fat; and d) optionally an additive; wherein the weight ratio of the polyurethane is 8-29 wt%, the weight ratio of the liquid reverse emulsion thickener is 0.8-6 wt%, and the weight ratio of the non-silicone oil grease is 1-8 wt%, and the weight ratio is based on the weight of the mask composition as 100 wt%. The invention also provides a preparation method, application and a using method of the mask composition.

The mask composition is preferably a dry-tear mask.

Component a) aqueous polyurethane dispersions

In the context of the present invention, the term "water-insoluble, non-water-dispersible isocyanate-functional polyurethane prepolymer" means that the prepolymer has a solubility in water of less than 10 g/l, preferably less than 5 g/l, at 23 ℃ and that the prepolymer does not give rise to a sedimentation-stable dispersion in water, in particular deionized water, at 23 ℃. In other words, in the experiment of dispersing it in water, the prepolymer precipitated out.

The aqueous polyurethane dispersion may be added to the mask composition as a solid or dispersion, preferably as a dispersion, i.e., the aqueous polyurethane dispersion is added to the mask composition. The polyurethane added to the mask composition in solid form can be dispersed in water in the mask composition to form an aqueous polyurethane dispersion.

For a material in dispersion form, the weight of the polyurethane (i.e., the weight of the active components of the aqueous polyurethane dispersion or the weight of the solid components of the aqueous polyurethane dispersion) is the weight of the dispersion x the solid component content of the dispersion. For solid substances containing water of crystallization, the weight of the polyurethane (i.e. the weight of the active component or the weight of the solid component) is the weight of the substance-the weight of the water of crystallization.

The polyurethane is preferably an anionic polyurethane.

The anionic polyurethanes are preferably obtained by reacting systems comprising at least one water-insoluble, non-water-dispersible isocyanate-functional polyurethane prepolymer a1) and at least one isocyanate-reactive compound a 2).

The anionic polyurethane preferably comprises at least one sulfonic acid group and/or sulfonate group, most preferably at least one sodium sulfonate group.

The anionic polyurethane may be linear or branched, most preferably linear.

The number average molecular weight of the anionic polyurethane may be from 100,000g/mol to 500,000g/mol, more preferably from 120,000g/mol to 400,000g/mol, most preferably from 150,000g/mol to 400,000 g/mol.

Water-insoluble, non-water-dispersible isocyanate-functional polyurethane prepolymers a1)

The water-insoluble, non-water-dispersible isocyanate-functional polyurethane prepolymer preferably has terminal isocyanate groups, i.e., isocyanate groups are located at the ends of the prepolymer chain, most preferably all of the chain ends of the polyurethane prepolymer have isocyanate groups.

The water-insoluble and water-non-dispersible isocyanate-functional polyurethane prepolymer is substantially free of ionic groups and/or ionogenic groups, i.e., the content of ionic groups and/or ionogenic groups is preferably less than 15 meq/100 g of polyurethane prepolymer, more preferably less than 5 meq/100 g of polyurethane prepolymer, more preferably less than 1 meq/100 g of polyurethane prepolymer, and most preferably less than 0.1 meq/100 g of polyurethane prepolymer. Water here refers to deionized water without added surfactant.

The water-insoluble and water-non-dispersible isocyanate-functional polyurethane prepolymers may be prepared by reacting a system comprising a polyol, an organic polyisocyanate, optionally a hydroxyl-functional compound having a number average molecular weight of 62 to 399g/mol, and optionally a non-ionic hydrophilizing agent.

The polyol is preferably one or more of the following: polyether polyols, polycarbonate polyols, polyether polycarbonate polyols and polyester polyols, further preferably polyols having a linear structure, and further preferably one or more of the following: polytetramethylene glycol polyethers and polycarbonate polyols, with polytetramethylene glycol polyethers being most preferred.

The number average molecular weight of the polyol is preferably from 400g/mol to 6000g/mol, most preferably from 600g/mol to 3000 g/mol.

The hydroxyl functionality of the polyol is preferably 1.5 to 6, more preferably 1.8 to 3, most preferably 1.9 to 2.1.

The organic polyisocyanate preferably has an isocyanate group (NCO) functionality of not less than 2.

The organic polyisocyanate is preferably one or more of the following: aliphatic polyisocyanates, aromatic polyisocyanates and cycloaliphatic polyisocyanates, further preferably one or more of the following: 1, 4-butylidene diisocyanate, 1, 6-Hexamethylene Diisocyanate (HDI), isophorone diisocyanate (IPDI), 2, 4-and/or 2, 4, 4-trimethylhexamethylene diisocyanate, bis (4, 4 '-isocyanatocyclohexyl) methane isomers or mixtures of these isomers, 1, 4-cyclohexylene diisocyanate, 4-isocyanatomethyl-1, 8-octane diisocyanate (nonane triisocyanate), 1, 4-phenylene diisocyanate, 2, 4-and/or 2, 6-toluene diisocyanate, 1, 5-naphthylene diisocyanate, 2' -and/or 2, 4 '-and/or 4, 4' -diphenylmethane diisocyanate, 1, 3-and/or 1, 4-bis (2-isocyanatoprop-2-yl) benzene (TMXDI), 1, 3-bis (isocyanatomethyl) benzene (XDI) and alkyl 2, 6-diisocyanatohexanoate with C1-C8-alkyl (lysine diisocyanate), most preferably one or more of the following: hexamethylene diisocyanate and isophorone diisocyanate.

The organic polyisocyanate may also be a polyisocyanate containing heteroatoms in the groups linking the isocyanate groups, for example a polyisocyanate obtained by structural modification with uretdiones, isocyanurates, urethanes, allophanates, biurets, carbodiimides, imino-oxadiazinediones and/or oxadiazinetriones.

The hydroxy-functional compound having a molecular weight of 62 to 399mol/g is preferably one or more of the following: non-polymeric polyols having no more than 20 carbon atoms, ester diols, and monofunctional hydroxyl compounds.

The non-polymeric polyol having no more than 20 carbon atoms is preferably one or more of the following: ethylene glycol, diethylene glycol, triethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 4-butanediol, 1, 3-butanediol, cyclohexanediol, 1, 4-cyclohexanedimethanol, 1, 6-hexanediol, neopentyl glycol, hydroquinone dihydroxyethyl ether, bisphenol A (2, 2-bis (4-hydroxyphenyl) propane), hydrogenated bisphenol A (2, 2-bis (4-hydroxycyclohexyl) propane), trimethylolpropane, trimethylolethane, glycerol and pentaerythritol.

The ester diol is preferably one or more of the following: α -hydroxybutyl epsilon-hydroxycaproate, ω -hydroxyhexyl gamma-hydroxybutyrate, β -hydroxyethyl adipate and bis (β -hydroxyethyl) terephthalate.

The monofunctional hydroxyl compound is preferably one or more of the following: ethanol, n-butanol, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monobutyl ether, 2-ethylhexanol, 1-octanol, 1-dodecanol, and 1-hexadecanol.

The non-ionic hydrophilizing agent is preferably one or more of the following: polyoxyalkylene ethers containing hydroxyl, amino and thiol groups.

The nonionically hydrophilicizing agents are preferably monohydroxy-functionalized polyoxyalkylene polyether alcohols having from 5 to 70, preferably from 7 to 55, ethylene oxide units per molecule. The polyoxyalkylene polyether alcohols can be obtained in a known manner by alkoxylation of suitable starter molecules.

The monohydroxy-functionalized polyoxyalkylene polyether alcohol is preferably a pure polyoxyethylene ether or a mixed polyoxyethylene ether, the polyoxyethylene ether preferably containing not less than 30 mol%, most preferably not less than 40 mol%, of ethylene oxide units, based on 100 mol% of alkylene oxide units.

Isocyanate-reactive Compound a2)

The isocyanate reactive compound is preferably one or more of the following: amino-functional compounds and hydroxy-functional compounds.

The amino-functional compound is preferably one or more of the following: primary amines, secondary amines and diamines, most preferably diamines.

The amino-functional compound preferably comprises an amino-functional compound having no ionic group or ionogenic group and an amino-functional compound having an ionic group or ionogenic group.

The amino-functional compound having no ionic or ionogenic groups is preferably one or more of the following: organic diamines, polyamines, compounds containing primary and secondary amino groups, compounds containing amino (primary or secondary) and hydroxyl groups, and monofunctional isocyanate-reactive amine compounds.

The organic diamine is preferably one or more of the following: 1, 2-ethylenediamine, 1, 2-and 1, 3-diaminopropane, 1, 4-diaminobutane, 1, 6-diaminohexane, isophoronediamine, isomer mixtures of 2, 2, 4-and 2, 4, 4-trimethylhexamethylenediamine, 2-methylpentamethylenediamine, 4, 4-diaminodicyclohexylmethane, hydrazine hydrate and dimethylethylenediamine.

The polyamine is preferably diethylenetriamine.

The primary and secondary amino-containing compounds are preferably one or more of the following: diethanolamine, 3-amino-1-methylaminopropane, 3-amino-1-ethylaminopropane, 3-amino-1-cyclohexylaminopropane and 3-amino-1-methylaminobutane.

The alkanolamine compound containing amino (primary or secondary) and hydroxyl groups is preferably one or more of the following: n-aminoethylethanolamine, ethanolamine, 3-aminopropanol and neopentanolamine.

The monofunctional isocyanate-reactive amine compound is preferably one or more of the following: methylamine, ethylamine, propylamine, butylamine, octylamine, laurylamine, stearylamine, isononyloxypropylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, N-methylaminopropylamine, diethyl (methyl) aminopropylamine, morpholine, piperidine and suitable substituted derivatives thereof.

The amino-functional compound having no ionic or ionogenic groups is most preferably a diamine having no ionic or ionogenic groups.

The amino-functional compounds having ionic or ionogenic groups are preferably anionically hydrophilicized compounds.

The anionically hydrophilicizing compounds are preferably one or more of the following: 2- (2-aminoethylamino) ethanesulfonic acid, ethylenediamine-propyl-or-butyl-sulfonic acid, 1, 2-or 1, 3-propylenediamine- β -ethanesulfonic acid and taurine and salts thereof, further preferred are those containing a sulfonate group as the ionic group and two amino groups, most preferred is one or more of the following: 2- (2-aminoethylamino) ethanesulfonate and 1, 3-propanediamine-beta-ethanesulfonate.

The hydroxyl functional compound is preferably a polymer polyol, further preferably one or more of the following: polyester polyols, polyacrylate polyols, polyurethane polyols, polycarbonate polyols, polyether polyols, polyester polyacrylate polyols, polyurethane polyester polyols, polyurethane polyether polyols, polyurethane polycarbonate polyols and polyester polycarbonate polyols, and further preferably one or more of the following: polytetramethylene glycol polyether and polycarbonate polyols, with polytetramethylene glycol polyether polyols being most preferred.

The anionic aqueous polyurethane dispersion is preferably one or more of the following: polyurethane-34, polyurethane-32, polyurethane-35, polyurethane-48, polyurethane-11 and polyUrethane-2, the above designations all using international cosmetic raw material INCI; most preferably one or more of the following:

and

preparation of anionic aqueous polyurethane dispersions

The preparation method of the anionic aqueous polyurethane dispersion comprises the following steps:

preparing a water-insoluble, non-water-dispersible isocyanate-functional polyurethane prepolymer a 1);

reacting the polyurethane prepolymer a1) and the isocyanate-reactive compound a 2);

and

the anionic polyurethane is dispersed in water before, during or after the reaction.

The anionic aqueous polyurethane dispersion comprises anionic groups introduced by the amino-functional compound having an ionic group or an ionogenic group in the isocyanate-reactive compound.

The preparation of the anionic aqueous polyurethane dispersions can be carried out in one or more stages in homogeneous phase or, for multistage reactions, partly in dispersed phase. The anionic aqueous polyurethane dispersion may be prepared by a prepolymer mixing process, an acetone process or a melt dispersion process, preferably by the acetone process.

The equivalent ratio of isocyanate groups to isocyanate-reactive groups is preferably 1.05 to 3.5, more preferably 1.1 to 3.0, most preferably 1.1 to 2.5.

The anionic polyurethane particle size is preferably less than 750nm, most preferably less than 500 nm. The particle size of the present invention is determined by diluting the anionic polyurethane with deionized water and measuring with a Malvern Zetasizer 1000 from Malver corporation.

The solid component content of the anionic aqueous polyurethane dispersion is preferably 5% to 50% by weight, most preferably 10% to 15% by weight, based on 100% by weight of the anionic aqueous polyurethane dispersion. The solid component content was calculated by heating a weighed sample at 125 ℃ to a constant weight and reweighing the sample at the constant weight.

Component b) liquid phase inverse emulsion thickener

The liquid invert emulsion thickeners of the present invention may also be referred to as liquid invert emulsion thickeners, liquid (phase) invert emulsion thickeners, or liquid water-swellable droplet (HSD) thickeners.

The liquid inverse emulsion thickener of the present invention is preferably a formulated product of a system comprising at least one of an alkane and an isoalkane, a hydrophobically modified acrylic copolymer, and an oil-in-water nonionic emulsifier, by forming a formulation from at least one of an alkane and an isoalkane, a hydrophobically modified acrylic copolymer, and an oil-in-water nonionic emulsifier, and then adding the formulation to water to form the liquid inverse emulsion thickener. The hydrophobically modified acrylic copolymer is preferably a pre-neutralized hydrophobically modified acrylic copolymer, more preferably a coiled, pre-neutralized hydrophobically modified acrylic copolymer, most preferably one or more of the following: polyacrylamide, sodium acryloyldimethyl taurate copolymer and ammonium acryloyldimethyl taurate copolymer. The continuous phase of the liquid inverse emulsion thickener is at least one of alkane and isoalkane, the inner phase is a hydrophobically modified acrylic copolymer, particularly a coiled-coil shaped pre-neutralized hydrophobically modified acrylic copolymer, and the oil-in-water type nonionic emulsifier functions to facilitate phase transformation of the hydrophobically modified acrylic copolymer. The compound is firstly in the form of oil-in-water inverse emulsion, when the compound is added into water, the inverse emulsion is subjected to phase transformation, and a polymer chain which is neutralized in advance freely stretches, swells and swells at the outer phase to generate a sticky and stable gel, namely the liquid inverse emulsion thickener.

The liquid inverse emulsion thickener is preferably one or more of the following: simugel^TMEG、Simugel^TMEG QD、Simugel^TMEPG QD、Simugel^TMFL、Simugel^TM NS、Simugel^TM EPG、Simugel^TM SMS 88、Simugel^TMINS 100、Sepiplus^TM S、Sepiplus^TM 265、Sepiplus^TM 400、Sepigel^TM 305、aquagel 35、aquagel 45、aquagel 55、aquagel 65、novemer^TM ec-1polymer、novemer^TMec-2Polymer and novomer^TM ec-2cc polymer。

The amount of the liquid inverse emulsion thickener of component b) is preferably 1 wt% to 3 wt%, based on 100 wt% of the tearable mask composition. When the liquid inverse emulsion thickener is a dispersion or a substance containing water of crystallization, the amount of the liquid inverse emulsion thickener means the amount of an effective component or a solid component.

Component c) fats and oils of non-silicone oils

The non-silicon oil type grease is preferably non-silicon oil type vegetable grease, non-silicon oil type animal grease, non-silicon oil type mineral grease and non-silicon oil type synthetic grease; most preferably one or more of the following: caprylic capric triglyceride, macadamia nut oil and isododecane.

The amount of the non-silicone oil-based oil or fat is preferably 3 wt% to 5 wt% based on 100 wt% of the tear-off mask composition.

Component d) additives

The additives of the present invention are those that are physically and chemically compatible with the components of the mask composition of the present invention.

The additive is preferably one or more of the following: thickeners other than component b), fats and oils other than component c), emulsifiers, preservatives and humectants.

The thickener different from component b) is preferably one or more of the following: acrylic acids, celluloses, diatomaceous earth, carbomer, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthan gum, soy protein, gelatin, natural lanolin and agar.

The amount of the thickener other than component b) is preferably 0 to 10% by weight based on 100% by weight of the mask composition.

The fat or oil different from component c) is preferably one or more of the following: vegetable oils and fats, animal oils and fats, mineral oils and fats, and synthetic oils and fats, and most preferably one or more of the following: olive oil, coconut oil, castor oil, cottonseed oil, soybean oil, sesame oil, almond oil, peanut oil, corn oil, rice bran oil, tea seed oil, sea buckthorn oil, avocado oil, Chinese chestnut oil, European nut oil, walnut oil, cocoa butter, mink oil, egg yolk oil, lanolin oil, lecithin, squalane, lanolin derivatives, silicones, fatty acids, fatty alcohols, fatty acid esters, and petrolatum.

The amount of the oil or fat other than the component c) is preferably 0 to 10% by weight based on 100% by weight of the mask composition.

The emulsifier is preferably one or more of the following: carboxylates, sulphates, sulphonates, amine derivatives, alkyl ethers, stearyl esters, polyoxyethylene ethers and polyoxypropylene ethers.

The amount of the emulsifier is preferably 0 to 10% by weight, based on 100% by weight of the mask composition.

The preservative is preferably one or more of the following: alcohol preservatives, formaldehyde donors and aldehyde derivative preservatives, benzoic acid and its derivative preservatives, sodium hydroxymethylglycinate, p-hydroxyacetophenone and preservative combinations, further preferably a combination of phenoxyethanol and ethylhexylglycerin and/or a combination of methylpropanediol, octylene glycol and phenylpropanol, most preferably Dermosoft OMP.

The amount of the preservative is preferably 0.5 wt% to 2 wt% based on 100 wt% of the mask composition.

The humectant is preferably one or more of: polyols, amides, lactic acid and sodium lactate, sodium pyrrolidone carboxylate, glucose esters, collagen, chitin derivatives and chitosan, with polyols being most preferred.

The amount of the moisturizer is preferably 0 to 20% by weight based on 100% by weight of the mask composition.

Component e) a cosmetically acceptable medium

The mask composition may further comprise a cosmetically acceptable medium. The cosmetically acceptable medium may be selected based on the other ingredients in the mask composition.

The cosmetically acceptable medium is preferably one or more of the following: and an aqueous solution of water and a lower alkanol, more preferably water, and most preferably deionized water.

The aqueous solution of the lower alkanol is preferably a monohydric alcohol having from 1 to 6 carbon atoms, most preferably one or more of the following: ethanol and isopropanol.

The amount of the cosmetically acceptable medium may be an amount well known to those skilled in the art, and the amount of the cosmetically acceptable medium is preferably 20 to 90% by weight, more preferably 30 to 90% by weight, and most preferably 40 to 80% by weight, based on 100% by weight of the mask composition.

Method for preparing facial mask composition

In a preferred method for preparing the mask composition of the present invention, the mask composition is obtained by mixing the component a) aqueous polyurethane dispersion, the component b) liquid inverse emulsion thickener, the component c) non-silicone oil-type oil and fat, the optional component d) additive and the optional component e) cosmetically acceptable medium.

Most preferably, the method of making the mask composition of the present invention comprises the steps of:

i) mixing a thickener different from component b), optionally a component d) additive and optionally water;

ii) adding component b) and component c);

iii) adding component a) and optionally a preservative, optionally adding a neutralizing agent to adjust the pH to 6.5-7.0 to obtain the mask composition.

Said step i) may be a heating operation, preferably the substance obtained in step i) is cooled to a temperature of between 40 ℃ and 50 ℃ before entering step ii).

In the step ii), if the non-silicone oil grease of the component c) is liquid at normal temperature, the component c) is added at normal temperature; if the non-silicon oil grease of the component c) is solid at normal temperature, the non-silicon oil grease is firstly heated to 70-90 ℃ to be melted and then mixed with the component b), and the mixed substances are uniformly stirred at 70-90 ℃ and then cooled to below 45 ℃.

Mask composition

The mask composition may be in the form of a spray, gel, cream, or emulsion.

Examples

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event that a definition of a term in this specification conflicts with a meaning commonly understood by those skilled in the art to which the invention pertains, the definition set forth herein shall govern.

Unless otherwise indicated, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth herein are approximations that can vary depending upon the desired properties to be obtained.

As used herein, "and/or" means one or all of the referenced elements.

As used herein, "comprising" and "comprises" encompass the presence of only the recited elements as well as the presence of other, non-recited elements in addition to the recited elements.

All percentages in the present invention are weight percentages and are based on 100% by weight of the cosmetic composition of the present invention, unless otherwise indicated.

The molecular weight in the present invention is a number average molecular weight unless otherwise specified. The number average molecular weight was measured by Gel Permeation Chromatography (GPC) according to GB/T21863-.

The analytical measurements according to the invention were carried out at 23. + -. 2 ℃ unless otherwise stated.

The solids content of the aqueous polyurethane dispersions was determined using a HS153 moisture meter from Mettler Toledo according to DIN-EN ISO 3251.

The isocyanate group (NCO) content is determined volumetrically according to DIN-EN ISO 11909 and the data determined include the free and potentially free NCO content.

Isocyanate functionality was determined according to GPC.

The pH value was determined according to GB/T13531.1-2008.

Raw materials and reagents

Carbopol Ultrez 20: INCI is a crosslinked polymer of acrylic acid/C10-30 alkyl acrylic acid, 100% by weight solids, available from Lubrizol.

Simulgel INS 100: INCI is a hydroxyethyl acrylate/sodium acryloyldimethyl taurate copolymer and isohexadecane and polysorbate-60, 100% by weight solids, available from Seppic.

Sepigel 305: INCI is a polyacrylamide and C13-14 isoparaffin and lauryl alcohol ether-7, 100% by weight solids, available from Seppic.

Semugel EG: INCI is a sodium acrylate/sodium acryloyldimethyl taurate copolymer and isohexadecane and polysorbate-80, 100 wt% solids, available from Seppic.

Sepiplus 400: INCI is named polyacrylate-13 and polyisobutylene and polysorbate-20, 100% by weight solids, available from Seppic.

An anionic aqueous polyurethane dispersion having a solids content of 41% by weight and having an INCI name of polyurethane-35, obtainable from CoresiPolymer (China) Ltd.

The anionic aqueous polyurethane dispersion, having a solids content of 30% by weight and having the INCI name polyurethane-48, is commercially available from kostew polymers (china) ltd.

Carfil ST 11: INCI is polyurethane-35 and polyurethane-11, 45% solids by weight, and is available from Wanhua corporation.

Carfil 9221: INCI is polyurethane-35 with a solids content of 40% by weight and is available from Wanhua company.

Anionic aqueous polyurethane dispersion having a solids content of 32% by weight, having the INCI name polyurethane-34, commercially available from kostew polymers (china) ltd.

Anionic aqueous polyurethane dispersion having a solids content of 41% by weight, having the INCI name polyurethane-35, commercially available from kostew polymers (china) ltd.

INCI is known as phenoxyethanol and ethylhexylglycerin, 100% by weight solids, available from Schuelke&Mayr corporation.

DOWSIL^TMSH 245: INCI is cyclopentasiloxane with a 100% by weight solids content, available from Dow Chemical.

DOWSIL^TMSH 556: INCI is a phenyl trimethicone, 100% by weight solids, available from Dow Chemical.

Triethanolamine: the concentration is 99%, and the reagent is purchased from Shanghai Lingfeng reagent.

Preparation of mask composition

According to the components listed in the table, the

Adding the Ultrez 20 into a beaker filled with deionized water in advance, uniformly stirring until the solution in the beaker is completely transparent, adding the component b) during stirring, uniformly dispersing, then adding the component c) during stirring, stirring for 5 minutes, then adding the component a) and the component d), and continuously stirring until the solution is uniform.

Performance testing

Adhesion of the mask composition to the skin surface, pain sensation of the user, and residual amount of oil on the skin

Drawing a square grid of 4cm x 2cm on the inner side of the arm, weighing 0.2g of sample, uniformly coating the sample in the square grid, carefully tearing off the film completely after the sample is completely dried into a film, and sensing the skin adhesion force of each sample and scoring. The scores are 1-5 in sequence from low to high, the adhesive force is strong, the film cannot be picked up and torn to remove the score of 1, the adhesive force is not existed, and the film is easy to pick up and torn to remove the score of 5. The user felt the pain of the skin as each sample was pulled off and scored. The scores are 1-5 points from low to high in sequence, the strong pain is rated as 1 point, and the no pain is rated as 5 points. The user perceives the amount of oil remaining on the skin after the sample is pulled and scores. The scores are 1-5 in sequence from low to high, the fat residue is evaluated as 1 more, and no obvious fat residue is evaluated as 5. Residual oil on the skin can reduce the comfort of use and is too greasy. When the adhesive force fraction is more than or equal to 4, the pain feeling fraction is more than or equal to 4, and the oil residue fraction is more than or equal to 4, the mask composition is considered to have good dry tearing effect, no obvious greasy feeling in use and qualified.

Length of stretching

Three 4cm x 2cm squares are drawn on the inner side of the arm, 0.2g of sample is weighed and evenly smeared in the squares, and after the sample is completely dried into a film, the film is carefully and completely torn off. The torn film was stretched to break and the length at break was measured and recorded as the stretch length. The stretching length fraction is 1-5 minutes from low to high, and the fraction of 4 minutes or more is qualified. The stretching length 1 is 1 minute when it is from 0 to 12cm, 2 minutes when it is more than 12cm and not more than 20cm, 3 minutes when it is more than 20cm and not more than 28cm, 4 minutes when it is more than 28cm and not more than 36cm, and 5 minutes when it is more than 36 cm. The score of the stretching length is more than or equal to 4, which indicates that the mask is not easy to break in the tearing and removing process and can be torn off completely.

Table 1 shows the compositions of the mask compositions of examples 1 to 6 of the present invention and comparative examples 1 to 2 and the results of the performance tests. Table 2 shows the compositions of the mask compositions of examples 7 to 11 of the present invention and comparative examples 3 to 5 and the results of the performance tests. Table 3 composition and performance test results of mask compositions of examples 12 to 13 of the present invention and comparative examples 6 to 7. Table 4 compositions and performance test results of mask compositions according to examples 14-19 of the present invention. Table 5 composition and performance test results of mask compositions of examples 20 to 21 of the present invention and comparative examples 8 to 9.

TABLE 1 composition and Performance test results of mask compositions of inventive examples 1-6 and comparative examples 1-2

Note: the component unit is as follows: g; the above weights all include carrier weights.

Different liquid inverse emulsion thickeners of the component b) are selected in the examples 1-6, and the adhesion, the pain feeling stretching length and the grease residue test score of the sample of the example are not less than 4, which shows that the mask composition can be completely removed by dry tearing, the dry tearing effect is good, and a user has no obvious greasy feeling. The Sepiplus 400 content of comparative example 1 was 0.6 wt% and 6.4 wt%, respectively, and the mask composition comprising the same was rated 1 in the tensile length test and failed. The sample of comparative example 1 easily shrinks on the skin and does not spread uniformly, and the sample of comparative example 2 is too viscous to spread uniformly on the skin surface.

TABLE 2 compositions and performance test results of mask compositions of inventive examples 7-11 and comparative examples 3-5

Examples 7-11 different from examples 1-6, which selected the component c) non-silicone oil type oils, the samples of the examples had adhesion, pain, extension length and oil residue all of which were not less than 4 points on a test scale, indicating that the mask composition was able to be completely removed by dry tearing, and had good dry tearing effect without noticeable greasy feeling to the user. Comparative examples 3 to 5 each comprising the use of silicone oil-based grease in place of component c) used in the examples of the present invention showed that the samples of comparative examples 3 to 5 failed to compromise adhesion, pain, tensile length and grease residue.

TABLE 3 composition and Performance test results of mask compositions of inventive examples 12-13 and comparative examples 6-7

The samples of examples 12-13 all had adhesion, pain, extension, and residual oil scores of no less than 4 points, indicating that the mask composition was able to be completely removed by dry-tearing with good dry-tearing effect and no noticeable greasy feel to the user. Comparative example 6 contained 0.5 wt% caprylic/capric triglyceride and comparative example 7 contained 12 wt% caprylic/capric triglyceride, and the test results showed that the samples of comparative examples 6-7 failed to compromise adhesion, pain sensation, tensile length and residual amount of oil.

Table 4 composition and performance test results for mask compositions of examples 14-19 of the present invention

The samples of examples 14-19 contained different aqueous polyurethane dispersions, and the adhesion, pain, tensile length, and residual oil level test values of the samples were all no less than 4 minutes, indicating that the mask composition was able to be completely removed by dry tearing, and the dry tearing effect was good without noticeable greasiness to the user.

TABLE 5 composition and Performance test results of mask compositions of inventive examples 20-21 and comparative examples 8-9

The samples of examples 20-21 all had adhesion, painful feel, tensile length, and residual oil level scores of no less than 4 points, indicating that the mask composition was able to be completely removed by dry-tearing with good dry-tearing effect and no noticeable greasy feel to the user. The amount of the polyurethane in the mask compositions of comparative example 7 and comparative example 8 was less than 8% by weight or more than 29% by weight, and the test results showed that the samples of comparative example 8 and comparative example 9 could not give consideration to adhesion, pain, stretching length and residual amount of oil.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing description, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description; and therefore any changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A tear-off mask composition comprising the following components:

b) at least one liquid inverse emulsion thickener;

c) at least one non-silicone oil type of fat; and

d) optionally an additive;

2. The mask composition of claim 1, wherein the aqueous polyurethane dispersion has a solids content of 10% to 15% by weight, based on 100% by weight of the aqueous polyurethane dispersion.

3. The mask composition of claim 1 or 2, wherein the liquid inverse emulsion thickener is present in an amount of 1% to 3% by weight, based on 100% by weight of the mask composition.

4. The mask composition of any one of claims 1 to 3, wherein the non-silicone oil based oil is present in an amount of from 3% to 5% by weight based on 100% by weight of the mask composition.

5. A mask composition according to any one of claims 1-4, wherein said polyurethane is obtained from the reaction of a system comprising at least one water-insoluble, non-water dispersible isocyanate functional polyurethane prepolymer a1) and at least one isocyanate reactive compound a 2).

6. The mask composition of any one of claims 1-5, wherein the polyurethane comprises at least one sulfonic acid group and/or sulfonate group.

7. The mask composition of any one of claims 1-6, wherein the liquid inverse emulsion thickener is a formulated product of a system comprising at least one of an alkane and an isoalkane, a hydrophobically modified acrylic copolymer, and an oil-in-water nonionic emulsifier, the liquid inverse emulsion thickener having a continuous phase of the at least one of an alkane and an isoalkane and an internal phase of the hydrophobically modified acrylic copolymer.

8. The mask composition of claim 7, wherein the hydrophobically modified acrylic copolymer is pre-neutralized, most preferably a pre-neutralized hydrophobically modified acrylic copolymer in a coiled pattern.

9. The mask composition of claim 7 or 8, wherein the hydrophobically modified acrylic copolymer is one or more of: polyacrylamide, sodium acryloyldimethyl taurate copolymer and ammonium acryloyldimethyl taurate copolymer.

10. The mask composition of any one of claims 1 to 9 wherein the non-silicone oil type of oil is one or more of: vegetable oils and fats, animal oils and fats, mineral oils and fats, and synthetic oils and fats, and most preferably one or more of the following: caprylic capric triglyceride, macadamia nut oil and isododecane.

11. The mask composition of any one of claims 1-10, wherein the additive is one or more of the following: thickeners other than component b), fats and oils other than component c), emulsifiers, preservatives and humectants.

12. The mask composition of claim 11, wherein the amount of the thickener other than component b) is no more than 10% by weight, based on 100% by weight of the mask composition.

13. The mask composition of claim 11, wherein the amount of said oil different from component c) is not more than 10% by weight based on 100% by weight of the mask composition.

14. The mask composition of any one of claims 1-13, wherein the mask composition is a dry-tear mask.

15. A method of making a tear-off mask composition according to any one of claims 1 to 14, the mask composition being obtained by mixing component a) an aqueous polyurethane dispersion, component b) a liquid inverse emulsion thickener, component c) a non-silicone oil based oil and fat, and optionally component d) an additive.

16. Use of a tear-off mask composition according to any one of claims 1 to 14 to be applied to the skin for the treatment of the skin.

17. A method of skin care comprising applying a tear mask composition according to any one of claims 1-14 to a skin surface, drying to form a film, and removing the film from the skin.