WO2019225261A1 - 化粧料用オイル増粘剤及び油溶性共重合体 - Google Patents
化粧料用オイル増粘剤及び油溶性共重合体 Download PDFInfo
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- WO2019225261A1 WO2019225261A1 PCT/JP2019/017078 JP2019017078W WO2019225261A1 WO 2019225261 A1 WO2019225261 A1 WO 2019225261A1 JP 2019017078 W JP2019017078 W JP 2019017078W WO 2019225261 A1 WO2019225261 A1 WO 2019225261A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- A61K8/8105—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- A61K8/8111—Homopolymers or copolymers of aliphatic olefines, e.g. polyethylene, polyisobutene; Compositions of derivatives of such polymers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1812—C12-(meth)acrylate, e.g. lauryl (meth)acrylate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1818—C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/282—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing two or more oxygen atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/285—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety
- C08F220/287—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety and containing polypropylene oxide in the alcohol moiety
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/10—General cosmetic use
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/48—Thickener, Thickening system
Definitions
- the present invention relates to a novel cosmetic oil thickener and a novel oil-soluble copolymer that can be used for such a thickener.
- Patent Document 1 discloses a transparent material containing polyamide-8 and a liquid higher fatty acid having a C12 to C22 branched or unsaturated alkyl group or a liquid higher alcohol having a C12 to C22 branched or unsaturated alkyl group.
- An oily liquid thickener for cosmetics is disclosed.
- Patent Document 2 discloses an oily thickener for cosmetics comprising a specific silicone-modified polysaccharide compound and a silicone emulsifier.
- Patent Document 3 discloses an oily gelling agent for cosmetics containing a copolymer composed of a specific hydrophobic monomer and a specific hydrophilic monomer.
- the subject of the present invention is to provide a novel oil thickener capable of exhibiting a thickening effect on the oil used in cosmetics, and to be used for such a thickener. It is to provide an oil-soluble copolymer.
- Cosmetics comprising an oil-soluble copolymer having a monomer unit composed of a hydrophilic monomer, a monomer unit composed of an easily crystalline hydrophobic monomer, and a monomer unit composed of a hardly crystalline hydrophobic monomer Oil thickener.
- the easily crystalline hydrophobic monomer has 8 or more carbon atoms and is a solid monomer at room temperature, and the hardly crystalline hydrophobic monomer has 8 or more carbon atoms at room temperature.
- R 1 is a hydrogen atom, a glyceryl group, a linear or branched hydroxyalkyl group having 1 to 4 carbon atoms, or — (C 3 H 6 O) n H, where n is an integer of 2 to 10 A polypropylene glycol group, and R 2 is a hydrogen atom or a methyl group
- R 3 is a hydrogen atom or a methyl group
- R 4 is a linear or branched alkyl group or hydroxyalkyl group having 1 to 4 carbon atoms, or a substituent of the following formula 3.
- ⁇ Aspect 4> The thickener according to any one of embodiments 1 to 3, wherein the easily crystalline hydrophobic monomer is a monomer of the following formula 4:
- R 5 is a linear alkyl group having 16 to 22 carbon atoms
- R 6 is a hydrogen atom or a methyl group.
- R 7 is a branched alkyl group having 18 or less carbon atoms or a linear alkyl group having 12 or less carbon atoms
- R 8 is a hydrogen atom or a methyl group.
- the monomer of the formula 1 is 2-hydroxyethyl (meth) acrylate, glyceryl (meth) acrylate, PPG-6 (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-methacrylic acid 2- Selected from at least one of hydroxy-2-methylpropyl and (meth) acrylic acid, and the monomer of formula 2 is N- (2-hydroxyethyl) (meth) acrylamide, N-isopropyl (meth)
- the thickener according to any one of embodiments 3 to 5, selected from at least one of acrylamide and 2- (meth) acrylamide-2-methylpropanesulfonic acid.
- the monomer of formula 5 is hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate
- the monomer unit of the hydrophilic monomer is contained in a range of 30 to 50 mol%, and the monomer unit of the easily crystalline hydrophobic monomer is contained in a range of 40 to 65 mol%.
- the molar ratio of the monomer unit of the easily crystalline hydrophobic monomer to the monomer unit of the hardly crystalline hydrophobic monomer is 5: 1 to 8: 1.
- ⁇ Aspect 11> The thickener according to any one of embodiments 1 to 10, wherein the oil-soluble copolymer has a weight average molecular weight of 9000 to 80,000.
- R 1 is a hydrogen atom, a glyceryl group, a linear or branched hydroxyalkyl group having 1 to 4 carbon atoms, or — (C 3 H 6 O) n H, where n is an integer of 2 to 10 A polypropylene glycol group, and R 2 is a hydrogen atom or a methyl group
- R 3 is a hydrogen atom or a methyl group
- R 4 is a linear or branched alkyl group having 1 to 4 carbon atoms or a hydroxyalkyl group, or a substituent of the following formula 3
- R 5 is a linear alkyl group having 16 to 22
- the novel oil thickener which can exhibit the thickening effect with respect to the oil component used by cosmetics can be provided, and the novel oil solubility which can be used for such a thickener etc. Copolymers can be provided.
- the oil thickener for cosmetics of the present invention is a monomer unit composed of a hydrophilic monomer, a monomer unit composed of an easily crystalline hydrophobic monomer, and a monomer unit composed of a hardly crystalline hydrophobic monomer It is an oil-soluble copolymer having
- the copolymer disclosed in Patent Document 3 is composed of a specific hydrophobic monomer and a specific hydrophilic monomer.
- the hydrophobic monomer has a function of expressing the solubility in oil, and is easily crystallized, and as the copolymers come close to each other, it is crystallized by the hydrophobic monomer unit between the copolymers. It is thought that the network structure is formed in such a way as to take in oil.
- the hydrophilic monomer unit between copolymers is also couple
- the gel-like composition gelled by the oily gelling agent is diluted with an oil or the like, the gel-like material and the oil are only separated, and, for example, has a lower viscosity than the gel-like composition. It does not become a thick composition.
- the oil-soluble copolymer of the present invention is a monomer composed of a hardly crystalline hydrophobic monomer in addition to a monomer unit composed of a hydrophilic monomer and a monomer unit composed of an easily crystalline hydrophobic monomer.
- This difficultly crystalline hydrophobic monomer unit inhibits crystallization by an easily crystalline hydrophobic monomer unit and suppresses the expression of the network structure based on the crystallization of the two network structures. It is thought that it can function as an oil thickener.
- the copolymer obtained only from the hydrophilic monomer and the hardly crystalline hydrophobic monomer is difficult to dissolve or does not dissolve in the oil
- the easily crystalline hydrophobic monomer constituting the oil-soluble copolymer of the present invention is believed to contribute to oil solubility.
- hydrophilic monomer means a monomer that dissolves in water at an arbitrary ratio
- hydrophobic monomer means another monomer, that is, a monomer that is basically immiscible with water.
- the terms “easily crystalline hydrophobic monomer” and “hardly crystalline hydrophobic monomer” mean that, for example, when two hydrophobic monomers are compared, the easier to crystallize, It is intended that the more volatile monomer that is less crystallized is a less crystalline hydrophobic monomer.
- the hardly crystalline hydrophobic monomer includes a hydrophobic monomer which does not crystallize at all.
- a hydrophobic monomer that crystallizes at a high temperature when cooled from the molten state can be an easily crystalline hydrophobic monomer, and crystallizes at a lower temperature when cooled from the molten state.
- the hydrophobic monomer that is converted to non-crystallizing or the hydrophobic monomer that is not crystallized can be made into a hardly crystalline hydrophobic monomer.
- the crystallization temperature of the easily crystalline hydrophobic monomer can be defined as, for example, 20 ° C. or higher, 25 ° C. or higher, or 30 ° C. or higher. As temperature, it can prescribe
- an easily crystalline hydrophobic monomer there may be mentioned a solid hydrophobic monomer having 8 or more, 16 or more, or 18 or more carbon atoms and crystallized at room temperature.
- the hardly crystalline hydrophobic monomer include a liquid hydrophobic monomer having 8 or more, 12 or 16 or 16 or more carbon atoms and not crystallizing at room temperature.
- normal temperature intends a temperature range of 15 ° C. to 25 ° C.
- such a readily crystalline hydrophobic monomer may be a monomer having a glass transition temperature of a homopolymer obtained from such a monomer of 10 ° C. or higher, 12 ° C. or higher, or 15 ° C. or higher. Moreover, the monomer which becomes 60 degrees C or less, 55 degrees C or less, or 50 degrees C or less may be sufficient. Further, the hardly crystalline hydrophobic monomer may be a monomer having a glass transition temperature of a homopolymer obtained from such a monomer of ⁇ 90 ° C. or higher, ⁇ 88 ° C. or higher, or ⁇ 86 ° C. or higher. , 0 ° C. or lower, ⁇ 5 ° C. or lower, or ⁇ 10 ° C. or lower.
- the viscosity of at a shear rate is close to 0 s -1 as possible, for example, shear rate at 0.0001 s -1, static ⁇ degree under 25 ° C. atmosphere It can be defined as a range of more than 20000 Pa ⁇ s, 25000 Pa ⁇ s or more, or 30000 Pa ⁇ s or more.
- the viscosity of the thickened product thickened with the oil thickener of the present invention is 20,000 Pa ⁇ s or less, 15000 Pa ⁇ s or less, or 10,000 Pa ⁇ s at a shear rate of 0.0001 s ⁇ 1 and 25 ° C. atmosphere. It can be defined as the following range, and can be defined as a range of 100 Pa ⁇ s or more, 150 Pa ⁇ s or more, or 200 Pa ⁇ s or more.
- (meth) acryl means acrylic or methacrylic.
- Oil-soluble copolymer of the present invention has monomer units composed of hydrophilic monomers, monomer units composed of easily crystalline hydrophobic monomers, and monomer units composed of hardly crystalline hydrophobic monomers. doing.
- Such a copolymer may be either a random type or a block type, but is preferably a random type from the viewpoint of ease of synthesis.
- the monomer unit of the hydrophilic monomer may be contained in an amount of 30 mol% or more, 32 mol% or more, or 35 mol% or more, and 50 mol% or less. 48 mol% or less, or 45 mol% or less.
- the monomer unit of the easily crystalline hydrophobic monomer may be contained in an amount of 40 mol% or more, 42 mol% or more, or 45 mol% or more, and 65 mol% or less. 63 mol% or less, 62 mol% or less, 61 mol% or less, or 60 mol% or less.
- the monomer unit of the hardly crystalline hydrophobic monomer may be contained in an amount of 5 mol% or more, 8 mol% or more, or 9 mol% or more, and 15 mol% or less, 13 It may be contained in mol% or less, or 12 mol% or less.
- the monomer unit of the easily crystalline hydrophobic monomer and the hardly crystalline hydrophobic monomer is preferably in the range of 5: 1 to 8: 1, more preferably in the range of 5: 1 to 7: 1, and 5.5: 1 to 6 :. More preferably, it is in the range of 1.
- the molecular weight of the oil-soluble copolymer is not particularly limited.
- the weight average molecular weight in terms of polystyrene in gel permeation chromatography can be in the range of 9,000 to 80,000, and is 20,000.
- the range is preferably from 50,000 to 50,000, more preferably from 25,000 to 40,000.
- hydrophilic monomer for example, at least one monomer selected from the following formulas 1 and 2 can be used.
- R 1 is represented by a hydrogen atom, a glyceryl group, a linear or branched hydroxyalkyl group having 1 to 4 carbon atoms, or — (C 3 H 6 O) n H, where n is 2 A polypropylene glycol group which is an integer of ⁇ 10, and R 2 is a hydrogen atom or a methyl group.
- examples of the hydroxyalkyl group include 2-hydroxyethyl group, 2-hydroxypropyl group, 2-hydroxyethyl-2-methylpropyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4-hydroxybutyl group. Groups and the like.
- hydrophilic monomer represented by Formula 1 examples include 2-hydroxyethyl (meth) acrylate, glyceryl (meth) acrylate, PPG-6 (meth) acrylate, and (meth) acrylic acid 2 -Hydroxypropyl, 2-hydroxy-2-methylpropyl (meth) acrylate, (meth) acrylic acid, etc.
- glyceryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, (meth) Acrylic acid is preferred, glyceryl methacrylate, 2-hydroxyethyl acrylate, and acrylic acid are more preferred.
- R 3 is a hydrogen atom or a methyl group
- R 4 is a linear or branched alkyl or hydroxyalkyl group having 1 to 4 carbon atoms, or a substitution of the following Formula 3 It is a group.
- examples of the alkyl group in R 4 include an ethyl group, a propyl group, an isopropyl group, a butyl group, and the like
- examples of the hydroxyalkyl group include a 2-hydroxyethyl group, a 2-hydroxypropyl group, and a 2-hydroxy group. Examples include ethyl-2-methylpropyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, 4-hydroxybutyl group and the like.
- hydrophilic monomer represented by formula 2 examples include N- (2-hydroxyethyl) (meth) acrylamide, N-isopropyl (meth) acrylamide, and 2- (meth) acrylamide-2-methylpropane.
- a sulfonic acid etc. are mentioned.
- N- (2-hydroxyethyl) (meth) acrylamide and N-isopropyl (meth) acrylamide are preferable, N- (2-hydroxyethyl) (meth) acrylamide is more preferable, and N- (2-hydroxyethyl) acrylamide is preferable. Is particularly preferred.
- R 5 is a linear alkyl group having 16 to 22 carbon atoms
- R 6 is a hydrogen atom or a methyl group.
- examples of the linear alkyl group having 16 to 22 carbon atoms include a cetyl group, a stearyl group, and a behenyl group.
- the hydrophobic monomer is an (meth) acrylic acid alkyl ester, that is, an ester composed of (meth) acrylic acid and an alcohol having a linear alkyl group having 16 to 22 carbon atoms.
- an (meth) acrylic acid alkyl ester that is, an ester composed of (meth) acrylic acid and an alcohol having a linear alkyl group having 16 to 22 carbon atoms.
- stearyl (meth) acrylate is preferable.
- R 7 is a branched alkyl group having 18 or less carbon atoms or a linear alkyl group having 12 or less carbon atoms
- R 8 is a hydrogen atom or a methyl group.
- the linear or branched alkyl group in R 7 an alkyl group having 3 or more, 4 or more, 5 or more, 6 or more, 7 or more, or 8 or more carbon atoms can be used.
- R 8 is preferably a hydrogen atom.
- hydrophobic monomer represented by Formula 5 examples include hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, (meth ) Decyl acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, isostearyl (meth) acrylate, etc.
- the oil-soluble copolymer of the present invention may further have a monomer unit composed of monomers other than the above formulas 1, 2, 4, and 5 as long as the effects of the present invention are not impaired.
- the ratio of such monomer units can be in the range of 30 mol% or less, 20 mol% or less, 10 mol% or less, or 5 mol% or less of the total amount of monomer units constituting the monomer unit.
- Examples of such monomers include one or more monomers selected from the group consisting of various anionic monomers, cationic monomers, nonionic monomers, and other monomers.
- the oil-soluble copolymer of the present invention can be obtained by a known polymerization method, and is not limited to the following method.
- hydrophilic monomers, easily crystalline hydrophobic monomers, and hardly crystalline hydrophobic monomers can be used.
- a mixture, a polymerization solvent, and a polymerization initiator are charged into a reaction vessel, and the polymerization reaction is allowed to proceed for several hours while heating to maintain a constant temperature.
- an oil-soluble copolymer can be obtained by distilling off the polymerization solvent from the solution in the reaction vessel.
- a copolymer can be obtained by a living radical polymerization method.
- the molecular weight of the copolymer can be easily adjusted, and a copolymer having a narrow molecular weight distribution can be produced.
- polymerization solvent a solvent that does not exhibit reactivity with the functional group of the monomer is appropriately selected.
- hydrocarbon solvents such as n-hexane, n-octane, n-decane, isodecane, cyclohexane, methylcyclohexane, toluene, xylene, ethylbenzene, cumene; methanol, ethanol, n-propanol Alcohol solvents such as isopropanol, n-butanol, isobutanol, n-hexanol, benzyl alcohol, cyclohexanol; ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, Propylene glycol monoethylene
- polymerization initiator As the polymerization initiator, conventionally known polymerization initiators can be used, and are not particularly limited. For example, organic peroxides or azo compounds can be used. Specifically, benzoyl peroxide, dicumyl peroxide, diisopropyl peroxide, di-t-butyl peroxide, t-butyl peroxybenzoate, t-hexyl peroxybenzoate, t-butyl peroxy-2-ethylhexanoate , T-hexylperoxy-2-ethylhexanoate, 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-bis (t-butyl Peroxy) hexyl-3,3-isopropyl hydroperoxide, t-butyl hydroperoxide, dicumyl hydroperoxide, acetyl peroxide, bis (4-t-t-
- the time for maintaining the reflux state is preferably continued until the monomer runs out, and is not particularly limited, but can be, for example, 1 hour or more, 2 hours or more, or 3 hours or more, It can be 144 hours or less, 72 hours or less, or 48 hours or less.
- the polymerization atmosphere is not particularly limited, and the polymerization may be carried out as it is in an air atmosphere, that is, oxygen may be present within the normal range in the polymerization system, or nitrogen may be removed as necessary. Alternatively, it may be performed in an atmosphere of an inert gas such as argon. Various materials to be used may remove impurities by distillation, activated carbon, alumina, or the like, but commercially available products may be used as they are. Further, the polymerization may be performed under light shielding or in a transparent container such as glass.
- a chain transfer agent may be added to the reaction vessel as necessary in order to adjust the molecular weight of the copolymer.
- the chain transfer agent is not particularly limited, and examples thereof include compounds having a mercapto group such as lauryl mercaptan and thioglycerol; inorganic salts such as sodium hypophosphite and sodium bisulfite; and ⁇ -methylstyrene dimer. .
- the amount of the chain transfer agent used is appropriately determined so that the molecular weight of the copolymer falls within the target range, but it is usually preferably in the range of 0.01 to 10% by mass with respect to the monomer.
- oil-soluble copolymer of the present invention can be dissolved in various hydrophobic organic solvents containing oil and the like and increase the viscosity of the solvent, for example, cosmetics, paints, inks, coating compositions, etc. Can be used in various applications. Especially, it is preferable to use as an oil thickener for cosmetics.
- the hydrophobic organic solvent is intended to be a solvent from which at least part of the organic solvent is separated when mixed with water.
- composition containing the oil-soluble copolymer of the present invention can be made into a composition having excellent transparency.
- such a composition can develop thickening without changing the color of the hydrophobic organic solvent.
- the blending amount of the oil-soluble copolymer of the present invention is 1% by mass or more, 2% by mass or more in 100% by mass of the mixture of the copolymer and the hydrophobic organic solvent, from the viewpoint of thickening, stability, etc. It can be 3 mass% or more, and can be 10 mass% or less, 8 mass% or less, or 5 mass% or less.
- the method for preparing the composition containing the copolymer and the hydrophobic organic solvent is not particularly limited.
- the present invention is not limited, specifically, a cosmetic using the oil-soluble copolymer of the present invention as an oil thickener will be described below.
- the hydrophobic organic solvent can be used alone or in combination of two or more, and is not limited to the following.
- various oils in particular, oils that are easily compatible with the thickener, such as hydrocarbon oils, ester oils, and higher alcohols.
- hydrocarbon oil examples include liquid paraffin, tetraisobutane, hydrogenated polydecene, olefin oligomer, isododecane, isohexadecane, squalane, and hydrogenated polyisobutene.
- Ester oils include cetyl isooctanoate (cetyl 2-ethylhexanoate), triethylhexanoin, 2-ethylhexyl palmitate, neopentyl glycol dicaprate, triisostearin, diisostearyl malate, PPG-3 dipivalate, succinic acid Examples include di-2-ethylhexyl, 2-ethylhexyl 2-ethylhexanoate, polyglyceryl-6 octacaprylate, and tri (caprylic / capric) glyceryl.
- higher alcohols examples include isostearyl alcohol and oleyl alcohol.
- the total amount of hydrocarbon oil, ester oil and higher alcohol is preferably 80% by mass or more, more preferably 85% by mass or more in the oil.
- the oil thickener of the present invention can be suitably used for various cosmetics, particularly oily cosmetics or water-in-oil emulsified cosmetics.
- oil-based cosmetics examples include skin care cosmetics such as sun care oils and cosmetic liquids; makeup cosmetics such as lipsticks, glosses, mascaras, and mascara bases; skin cleansing agents such as makeup removers; hair cosmetics such as hair oils and hair treatments Etc.
- Water-in-oil emulsified cosmetic examples include skin care cosmetics such as emulsions, creams, face oils, body oils, and cosmetics; makeup makeups such as foundations, makeup bases, lipsticks, blushers, eye shadows, mascaras, and mascara bases Skin cleansing agents such as makeup removers; hair cleansing agents; hair cosmetics such as hair treatments and hair oils; sunscreen cosmetics; hair dyes and the like.
- the cosmetic of the present invention can be appropriately blended with various components as long as the effects of the present invention are not affected.
- additive components that can be usually blended in cosmetics, for example, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, humectants, water-soluble polymers , Film forming agents such as silicone polysaccharides, sequestering agents, lower alcohols, polyhydric alcohols, various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, UV absorbers, pH adjusters, skin Water-soluble drugs, antioxidants, buffering agents, preservatives, antioxidant aids, propellants, organic powders, pigments, dyes, pigments, applicable to nutrients, vitamins, pharmaceuticals, quasi drugs, cosmetics, etc.
- a fragrance flavor, water, an acid component, an alkali component, etc. can be mentioned.
- Weight average molecular weight The weight average molecular weight of the obtained copolymer was calculated by gel permeation chromatography under the following measurement conditions.
- the copolymer was blended in various oils, dissolved while stirring at 85 ° C., and then cooled to room temperature to prepare a sample. Viscosity at increasing evaluation of viscosity, using a rheometer MCR302 of manufactured by Anton Paar, 25 ° C., under the conditions of 1 atm, at a shear rate is close to 0 s -1 as possible, that is, the shear rate 0.0001 s -1 Based on the following criteria, evaluation was performed. The results are shown in Table 1. Here, the blending amount of the copolymer was prepared such that 3% by mass of the copolymer was contained with respect to the total amount of the copolymer and the oil component.
- A 2000 Pa ⁇ s or more and 20,000 Pa ⁇ s or less
- B 1000 Pa ⁇ s or more and less than 2000 Pa ⁇ s
- C 100 Pa ⁇ s or more and less than 1000 Pa ⁇ s
- D 1 Pa ⁇ s or more and less than 100 Pa ⁇ s
- E 20, More than 000 Pa ⁇ s (gelled)
- the copolymer was blended in various oils, dissolved while stirring at 85 ° C., and then cooled to room temperature to prepare a sample.
- Table 1 shows the results of visual observation of the transparency of the sample and evaluation based on the following criteria.
- the blending amount of the copolymer was prepared such that 3% by mass of the copolymer was contained with respect to the total amount of the copolymer and the oil component.
- Example 25 of the embodiment using 2-hydroxy-2-methylpropyl methacrylate and Example 27 of the embodiment using 2-hydroxypropyl methacrylate, and an embodiment using N-isopropylacrylamide as the hydrophilic monomer In comparison with Example 26 of Example 26 and Example 28 of the embodiment using 2-hydroxyethyl methacrylate, it was found that compatibility and thickening were improved in Examples 26 and 28. Further, Example 15 using glyceryl methacrylate, Example 22 using 2-hydroxyethyl acrylamide, Example 23 using 2-hydroxyethyl acrylate, and embodiment using acrylic acid As for Example 24, it was found that the compatibility, thickening and transparency were further improved.
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Abstract
Description
親水性モノマーから構成されるモノマー単位、易結晶性の疎水性モノマーから構成されるモノマー単位、及び難結晶性の疎水性モノマーから構成されるモノマー単位を有する油溶性共重合体である、化粧料用オイル増粘剤。
〈態様2〉
前記易結晶性の疎水性モノマーは、炭素原子数が8以上であり、常温で固体のモノマーであり、かつ、前記難結晶性の疎水性モノマーは、炭素原子数が8以上であり、常温で液体のモノマーである、態様1に記載の増粘剤。
〈態様3〉
前記親水性モノマーが、下記の式1及び式2から選択される少なくとも一種のモノマーである、態様1又は2に記載の増粘剤:
R1は、水素原子、グリセリル基、炭素原子数1~4の直鎖状若しくは分岐状のヒドロキシアルキル基、又は-(C3H6O)nHで示され、nが2~10の整数であるポリプロピレングリコール基であり、かつ
R2は、水素原子又はメチル基であり、
R3は、水素原子又はメチル基であり、かつ
R4は、炭素原子数1~4の直鎖状若しくは分岐状のアルキル基若しくはヒドロキシアルキル基、又は下記の式3の置換基である。
前記易結晶性の疎水性モノマーが、下記の式4のモノマーである、態様1~3の何れかに記載の増粘剤:
R5は、炭素原子数16~22の直鎖状のアルキル基であり、かつ
R6は、水素原子又はメチル基である。
〈態様5〉
前記難結晶性の疎水性モノマーが、下記の式5のモノマーである、態様1~4の何れかに記載の増粘剤:
R7は、炭素原子数18以下の分岐状のアルキル基、又は炭素原子数12以下の直鎖状のアルキル基であり、かつ
R8は、水素原子又はメチル基である。
〈態様6〉
前記式1のモノマーが、(メタ)アクリル酸2-ヒドロキシエチル、(メタ)アクリル酸グリセリル、(メタ)アクリル酸PPG-6、(メタ)アクリル酸2-ヒドロキシプロピル、(メタ)アクリル酸2-ヒドロキシ-2-メチルプロピル、及び(メタ)アクリル酸の中の少なくとも一種から選択され、かつ、前記式2のモノマーが、N-(2-ヒドロキシエチル)(メタ)アクリルアミド、N-イソプロピル(メタ)アクリルアミド、及び2-(メタ)アクリルアミド-2-メチルプロパンスルホン酸の中の少なくとも一種から選択される、態様3~5の何れかに記載の増粘剤。
〈態様7〉
前記式4のモノマーが、(メタ)アクリル酸セチル、(メタ)アクリル酸ステアリル、及び(メタ)アクリル酸ベヘニルの中の少なくとも一種から選択される、態様4~6の何れかに記載の増粘剤。
〈態様8〉
前記式5のモノマーが、(メタ)アクリル酸ヘキシル、(メタ)アクリル酸2-エチルヘキシル、(メタ)アクリル酸オクチル、(メタ)アクリル酸イソオクチル、(メタ)アクリル酸デシル、(メタ)アクリル酸イソデシル、(メタ)アクリル酸ラウリル、及び(メタ)アクリル酸イソステアリルの中の少なくとも一種から選択される、態様5~7の何れかに記載の増粘剤。
〈態様9〉
前記油溶性共重合体において、前記親水性モノマーのモノマー単位が、30~50モル%の範囲で含まれており、前記易結晶性の疎水性モノマーのモノマー単位が、40~65モル%の範囲で含まれており、前記難結晶性の疎水性モノマーのモノマー単位が、5~15モル%の範囲で含まれている、態様1~8の何れかに記載の増粘剤。
〈態様10〉
前記油溶性共重合体において、前記易結晶性の疎水性モノマーのモノマー単位と前記難結晶性の疎水性モノマーのモノマー単位とのモル比が、5:1~8:1である、態様1~9の何れかに記載の増粘剤。
〈態様11〉
前記油溶性共重合体の重量平均分子量が、9000~80000である、態様1~10の何れかに記載の増粘剤。
〈態様12〉
態様1~11の何れかに記載の増粘剤及び油分を含むオイル系化粧料。
〈態様13〉
下記の式1及び式2から選択される少なくとも一種の親水性モノマーから構成されるモノマー単位、
下記の式4の易結晶性の疎水性モノマーから構成されるモノマー単位、並びに
下記の式5の難結晶性の疎水性モノマーから構成されるモノマー単位
を有する、油溶性共重合体:
R1は、水素原子、グリセリル基、炭素原子数1~4の直鎖状若しくは分岐状のヒドロキシアルキル基、又は-(C3H6O)nHで示され、nが2~10の整数であるポリプロピレングリコール基であり、かつ
R2は、水素原子又はメチル基であり、
R3は、水素原子又はメチル基であり、かつ
R4は、炭素原子数1~4の直鎖状若しくは分岐状のアルキル基若しくはヒドロキシアルキル基、又は下記の式3の置換基であり、
R5は、炭素原子数16~22の直鎖状のアルキル基であり、かつ
R6は、水素原子又はメチル基であり、
R7は、炭素原子数18以下の分岐状のアルキル基、又は炭素原子数12以下の直鎖状のアルキル基であり、かつ
R8は、水素原子又はメチル基である。
本発明の油溶性共重合体は、親水性モノマーから構成されるモノマー単位、易結晶性の疎水性モノマーから構成されるモノマー単位、及び難結晶性の疎水性モノマーから構成されるモノマー単位を有している。係る共重合体は、ランダム型又はブロック型のいずれであってもよいが、合成の容易性の観点から、ランダム型であることが好ましい。
親水性モノマーとしては、例えば、下記の式1及び式2から選択される少なくとも一種のモノマーを使用することができる。
本発明の油溶性共重合体は、本発明の効果を損なわない範囲であれば、上記式1、2、4、5以外のモノマーから構成されるモノマー単位をさらに有していてもよい。係るモノマー単位の割合は、構成するモノマー単位全量の30モル%以下、20モル%以下、10モル%以下、又は5モル%以下の範囲とすることができる。係るモノマーとしては、例えば、各種のアニオン性モノマー、カチオン性モノマー、ノニオン性モノマー、及びこれら以外のモノマーからなる群から選ばれる一種以上のモノマーが挙げられる。
本発明の油溶性共重合体は、公知の重合法によって得ることができ、次の方法に限定されないが、例えば、親水性モノマー、易結晶性の疎水性モノマー及び難結晶性の疎水性モノマーの混合物、重合溶媒、並びに重合開始剤を反応容器内に仕込み、一定温度を保つように加温しながら数時間維持して重合反応を進行させる。次いで、反応容器内の溶液から重合溶媒を留去することで、油溶性共重合体を得ることができる。
重合溶媒としては、モノマーの官能基に対して反応性を示さないような溶媒が適宜選択される。次のものに限定されないが、例えば、n-ヘキサン、n-オクタン、n-デカン、イソデカン、シクロヘキサン、メチルシクロヘキサン、トルエン、キシレン、エチルベンゼン、クメンなどの炭化水素系溶剤;メタノール、エタノール、n-プロパノール、イソプロパノール、n-ブタノール、イソブタノール、n-ヘキサノール、ベンジルアルコール、シクロヘキサノールなどのアルコール系溶剤;エチレングリコール、ジエチレングリコール、プロピレングリコール、ジプロピレングリコール、メチルセロソルブ、エチルセロソルブ、ブチルセロソルブ、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールプロピルエーテル、ブチルカルビトール、ブチルトリエチレングリコール、メチルジプロピレングリコールなどの水酸基含有グリコールエーテル;ジグライム、トリグライム、メチルセロソルブアセテート、プロピレングリコールモノメチルエーテルアセテート、ジプロピレングリコールブチルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテートなどのグリコール系溶剤;ジエチルエーテル、ジプロピルエーテル、メチルシクロプロピルエーテル、テトラヒドロフラン、ジオキサン、アニソールなどのエーテル系溶剤;ジメチルケトン、ジエチルケトン、エチルメチルケトン、イソブチルメチルケトン、シクロヘキサノン、イソホロン、アセトフェノンなどのケトン系溶剤;酢酸メチル、酢酸エチル、酢酸ブチル、酢酸プロピル、酪酸メチル、酪酸エチル、カプロラクトン、乳酸メチル、乳酸エチルなどのエステル系溶剤;クロロホルム、ジクロロメタン、ジクロロエタン、o-ジクロロベンゼンなどのハロゲン系溶剤;ホルムアミド、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、2-ピロリドン、N-メチル-2-ピロリドン、ε-カプロラクタムなどのアミド系溶剤;ジメチルスルホキシド、スルホラン、テトラメチル尿素、エチレンカーボネート、プロピレンカーボネート、炭酸ジメチル、炭酸ジエチル、ニトロメタン、アセトニトリル、ニトロベンゼン、ジオクチルフタレートなどが挙げられる。
重合開始剤としては、従来公知のものを使用することができ、特に限定されないが、例えば、有機過酸化物又はアゾ化合物などを使用することができる。具体的には、ベンゾイルパーオキシド、ジクミルパーオキシド、ジイソプロピルパーオキシド、ジ-t-ブチルパーキシド、t-ブチルパーオキシベンゾエート、t-ヘキシルパーオキシベンゾエート、t-ブチルパーオキシ-2-エチルヘキサノエート、t-ヘキシルパーオキシ-2-エチルヘキサノエート、1,1-ビス(t-ブチルパーオキシ)3,3,5-トリメチルシクロヘキサン、2,5-ジメチル-2,5-ビス(t-ブチルパーオキシ)ヘキシル-3,3-イソプロピルヒドロパーオキシド、t-ブチルヒドロパーオキシド、ジクミルヒドロパーオキシド、アセチルパーオキシド、ビス(4-t-ブチルシクロヘキシル)パーオキシジカーボネート、イソブチルパーオキシド、3,3,5-トリメチルヘキサノイルパーオキシド、ラウリルパーオキシド、1,1-ビス(t-ブチルパーオキシ)3,3,5-トリメチルシクロヘキサン、1,1-ビス(t-ヘキシルパーオキシ)3,3,5-トリメチルシクロヘキサン、2,2’-アゾビス(イソブチロニトリル)、2,2’-アゾビス(2,4-ジメチルバレロニトリル)、2,2’-アゾビス(4-メトキシ-2,4-ジメチルバレロニトリル)、ジメチル2,2’-アゾビス(イソブチレート)などが挙げられる。
還流状態を維持する時間、即ち、重合時間は、モノマーがなくなるまで重合を続けることが好ましく、特に限定されないが、例えば、1時間以上、2時間以上又は3時間以上とすることができ、また、144時間以下、72時間以下又は48時間以下とすることができる。
重合雰囲気は、特に限定されず、大気雰囲気下でそのまま重合してもよく、即ち、重合系内に通常の範囲内で酸素が存在してもよいし、必要に応じて酸素を除去するため窒素又はアルゴン等の不活性ガスの雰囲気下で行ってもよい。使用する各種材料は、蒸留、活性炭又はアルミナ等で不純物を除去してもよいが、市販品をそのまま使用してもよい。また、重合を遮光下で行ってもよく、ガラスのような透明容器中で行ってもよい。
例えば、共重合体の分子量調節等のため、反応容器中に連鎖移動剤などの他の成分を必要に応じて添加してもよい。係る連鎖移動剤としては、特に限定されないが、例えば、ラウリルメルカプタン、チオグリセロール等のメルカプト基を有する化合物;次亜リン酸ナトリウム、亜硫酸水素ナトリウム等の無機塩;α-メチルスチレンダイマーなどが挙げられる。連鎖移動剤の使用量は、共重合体の分子量が目的の範囲となるように適宜決定されるが、通常、モノマーに対して0.01~10質量%の範囲が好ましい。
本発明の油溶性共重合体は、油分等を含む各種の疎水性有機溶媒に溶解し、係る溶媒の粘度を増加させることができるため、例えば、化粧料、塗料、インキ、コーティング用組成物等、種々の用途に使用することができる。中でも、化粧料用のオイル増粘剤として使用することが好ましい。ここで、疎水性有機溶媒とは、水と混合した場合に、少なくともその一部が分離する溶媒を意図する。
(疎水性有機溶媒)
本発明の油溶性共重合体を化粧料用オイル増粘剤として使用する場合、疎水性有機溶媒は、単独で又は二種以上組み合わせて使用することができ、また、次のものに限定されないが、特に、種々の油分、中でも、係る増粘剤と相溶し易い油分、例えば、炭化水素油、エステル油、及び高級アルコールの少なくとも一種を使用することが好ましい。
油性化粧料としては、例えば、サンケアオイル、美容液などのスキンケア化粧料;口紅、グロス、マスカラ、マスカラ下地などのメーキャップ化粧料;メイク落としなどの皮膚洗浄料;ヘアオイル、ヘアトリートメントなどの毛髪化粧料等が挙げられる。
油中水型乳化化粧料としては、例えば、乳液、クリーム、フェイスオイル、ボディーオイル、美容液などのスキンケア化粧料;ファンデーション、化粧下地、口紅、頬紅、アイシャドウ、マスカラ、マスカラ下地などのメーキャップ化粧料;メイク落としなどの皮膚洗浄料;毛髪洗浄料;ヘアトリートメント、ヘアオイルなどの毛髪化粧料;日焼け止め化粧料;染毛料等が挙げられる。
本発明の化粧料は、本発明の効果に影響を及ぼさない範囲で、各種成分を適宜配合することができる。各種成分としては、化粧料に通常配合し得るような添加成分、例えば、アニオン性界面活性剤、カチオン性界面活性剤、両性界面活性剤、非イオン性界面活性剤、保湿剤、水溶性高分子、シリコーン化多糖類等の皮膜形成剤、金属イオン封鎖剤、低級アルコール、多価アルコール、各種抽出液、糖、アミノ酸、有機アミン、高分子エマルジョン、キレート剤、紫外線吸収剤、pH調整剤、皮膚栄養剤、ビタミン、医薬品、医薬部外品、化粧品等に適用可能な水溶性薬剤、酸化防止剤、緩衝剤、防腐剤、酸化防止助剤、噴射剤、有機系粉末、顔料、染料、色素、香料、水、酸成分、アルカリ成分等を挙げることができる。これらの任意成分は、油相中及び存在する場合は水相中に適宜配合することができる。
〈共重合体の合成〉
還流冷却器、温度計、窒素ガス導入管及び撹拌機が取り付けられた容量1リットルの四つ口フラスコに、エタノール250質量部と、モノマーのモル比が表1又は表2に示す割合となるように各モノマーの混合物を合計で100質量部仕込み、窒素気流下で昇温した。約80℃の還流状態となった時点で、2,2’-アゾビスイソブチロニトリルを1質量部添加し、4時間、還流状態を維持して重合反応を進行させた。次いで、フラスコ内の溶液から溶媒のエタノールを留去することで、共重合体を得た。ただし、実施例12~18については、所定の重量平均分子量となるようにエタノール及び2,2’-アゾビスイソブチロニトリルの仕込み量を適宜調節した。
得られた共重合体の重量平均分子量は、以下の測定条件によるゲル浸透クロマトグラフィーによって算出した。
カラム:Shodex KF-805、KF-803、KF-801(直列)(昭和電工株式会社製)
移動相:テトラヒドロフラン
流速 :1mL/min
検出器:示差屈折率検出器
温度 :40℃
分子量標準試料:ポリスチレン
(油分との相溶性の評価)
共重合体を各種油分に配合し、85℃で攪拌しながら溶解させたときの共重合体と油分との相溶性を目視により観察して下記の基準で評価し、その結果を表1に示す。ここで、共重合体の配合量は、共重合体及び油分の合計量に対し、共重合体が3質量%含まれるように調製した。
B:溶解しづらかったが相溶した。
C:わずかに沈殿が見られた。
D:いくらか沈殿が見られた。
E:全く相溶しなかった。
共重合体を各種油分に配合し、85℃で攪拌しながら溶解させた後、室温まで冷却して試料を調製した。増粘性の評価は、Anton Paar社製のレオメーターMCR302を用い、25℃、1気圧の条件で、せん断速度が限りなく0s-1に近いところ、即ち剪断速度が0.0001s-1での粘度を基に下記の基準で評価した。その結果を表1に示す。ここで、共重合体の配合量は、共重合体及び油分の合計量に対し、共重合体が3質量%含まれるように調製した。
B:1000Pa・s以上、2000Pa・s未満
C:100Pa・s以上、1000Pa・s未満
D:1Pa・s以上、100Pa・s未満
E:20,000Pa・s超(ゲル化した。)
共重合体を各種油分に配合し、85℃で攪拌しながら溶解させた後、室温まで冷却して試料を調製した。係る試料の透明性を目視により観察し、下記の基準で評価した結果を表1に示す。ここで、共重合体の配合量は、共重合体及び油分の合計量に対し、共重合体が3質量%含まれるように調製した。
B:良好な透明性を呈した。
C:わずかな濁りを呈した。
D:いくらか白濁していた。
E:白濁していた。
表1から明らかなように、難結晶性疎水性モノマーから構成されるモノマー単位を含まない共重合体を使用した比較例1の組成物の場合は、共重合体が油分に対して相溶するものの、組成物自体はゲル化してしまった。また、易結晶性疎水性モノマーから構成されるモノマー単位を含まない共重合体を使用した比較例2の場合は、共重合体が油分に対して相溶しなかった。一方、これら二つのモノマー単位を含む本発明の共重合体を使用した実施例1~21の組成物の場合には、共重合体は、油分に対して相溶するとともに、少なくとも一方の油分に対し、ゲル化させることなく増粘させ得ることが確認できた。
Claims (13)
- 親水性モノマーから構成されるモノマー単位、易結晶性の疎水性モノマーから構成されるモノマー単位、及び難結晶性の疎水性モノマーから構成されるモノマー単位を有する油溶性共重合体である、化粧料用オイル増粘剤。
- 前記易結晶性の疎水性モノマーは、炭素原子数が8以上であり、常温で固体のモノマーであり、かつ、前記難結晶性の疎水性モノマーは、炭素原子数が8以上であり、常温で液体のモノマーである、請求項1に記載の増粘剤。
- 前記式1のモノマーが、(メタ)アクリル酸2-ヒドロキシエチル、(メタ)アクリル酸グリセリル、(メタ)アクリル酸PPG-6、(メタ)アクリル酸2-ヒドロキシプロピル、(メタ)アクリル酸2-ヒドロキシ-2-メチルプロピル、及び(メタ)アクリル酸の中の少なくとも一種から選択され、かつ、前記式2のモノマーが、N-(2-ヒドロキシエチル)(メタ)アクリルアミド、N-イソプロピル(メタ)アクリルアミド、及び2-(メタ)アクリルアミド-2-メチルプロパンスルホン酸の中の少なくとも一種から選択される、請求項3~5の何れか一項に記載の増粘剤。
- 前記式4のモノマーが、(メタ)アクリル酸セチル、(メタ)アクリル酸ステアリル、及び(メタ)アクリル酸ベヘニルの中の少なくとも一種から選択される、請求項4~6の何れか一項に記載の増粘剤。
- 前記式5のモノマーが、(メタ)アクリル酸ヘキシル、(メタ)アクリル酸2-エチルヘキシル、(メタ)アクリル酸オクチル、(メタ)アクリル酸イソオクチル、(メタ)アクリル酸デシル、(メタ)アクリル酸イソデシル、(メタ)アクリル酸ラウリル、及び(メタ)アクリル酸イソステアリルの中の少なくとも一種から選択される、請求項5~7の何れか一項に記載の増粘剤。
- 前記油溶性共重合体において、前記親水性モノマーのモノマー単位が、30~50モル%の範囲で含まれており、前記易結晶性の疎水性モノマーのモノマー単位が、40~65モル%の範囲で含まれており、前記難結晶性の疎水性モノマーのモノマー単位が、5~15モル%の範囲で含まれている、請求項1~8の何れか一項に記載の増粘剤。
- 前記油溶性共重合体において、前記易結晶性の疎水性モノマーのモノマー単位と前記難結晶性の疎水性モノマーのモノマー単位とのモル比が、5:1~8:1である、請求項1~9の何れか一項に記載の増粘剤。
- 前記油溶性共重合体の重量平均分子量が、9000~80000である、請求項1~10の何れか一項に記載の増粘剤。
- 請求項1~11の何れか一項に記載の増粘剤及び油分を含むオイル系化粧料。
- 下記の式1及び式2から選択される少なくとも一種の親水性モノマーから構成されるモノマー単位、
下記の式4の易結晶性の疎水性モノマーから構成されるモノマー単位、並びに
下記の式5の難結晶性の疎水性モノマーから構成されるモノマー単位
を有する、油溶性共重合体:
R1は、水素原子、グリセリル基、炭素原子数1~4の直鎖状若しくは分岐状のヒドロキシアルキル基、又は-(C3H6O)nHで示され、nが2~10の整数であるポリプロピレングリコール基であり、かつ
R2は、水素原子又はメチル基であり、
R3は、水素原子又はメチル基であり、かつ
R4は、炭素原子数1~4の直鎖状若しくは分岐状のアルキル基若しくはヒドロキシアルキル基、又は下記の式3の置換基であり、
R5は、炭素原子数16~22の直鎖状のアルキル基であり、かつ
R6は、水素原子又はメチル基であり、
R7は、炭素原子数18以下の分岐状のアルキル基、又は炭素原子数12以下の直鎖状のアルキル基であり、かつ
R8は、水素原子又はメチル基である。
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EP19808406.3A EP3797759A4 (en) | 2018-05-23 | 2019-04-22 | COSMETIC OIL THICKENING AGENT AND OIL-SOLUBLE COPOLYMER |
BR112020022992-0A BR112020022992A2 (pt) | 2018-05-23 | 2019-04-22 | espessante de óleo cosmético e copolímero solúvel em óleo |
US17/052,729 US20210212919A1 (en) | 2018-05-23 | 2019-04-22 | Cosmetic oil thickener and oil-soluble copolymer |
KR1020207032268A KR20210013038A (ko) | 2018-05-23 | 2019-04-22 | 화장료용 오일 증점제 및 유용성 공중합체 |
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