WO2023100789A1 - 液体洗剤の包装カプセル用水溶性フィルム及び液体洗剤包装カプセル - Google Patents
液体洗剤の包装カプセル用水溶性フィルム及び液体洗剤包装カプセル Download PDFInfo
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- WO2023100789A1 WO2023100789A1 PCT/JP2022/043713 JP2022043713W WO2023100789A1 WO 2023100789 A1 WO2023100789 A1 WO 2023100789A1 JP 2022043713 W JP2022043713 W JP 2022043713W WO 2023100789 A1 WO2023100789 A1 WO 2023100789A1
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- water
- soluble film
- liquid detergent
- silica particles
- polyvinyl alcohol
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Classifications
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
- C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
- C11D17/042—Water soluble or water disintegrable containers or substrates containing cleaning compositions or additives for cleaning compositions
- C11D17/043—Liquid or thixotropic (gel) compositions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
-
- 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
- C08F216/00—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 an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/02—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 an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F216/04—Acyclic compounds
- C08F216/06—Polyvinyl alcohol ; Vinyl alcohol
-
- 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
- C08F8/00—Chemical modification by after-treatment
- C08F8/46—Reaction with unsaturated dicarboxylic acids or anhydrides thereof, e.g. maleinisation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
- C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
- C11D17/042—Water soluble or water disintegrable containers or substrates containing cleaning compositions or additives for cleaning compositions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use 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 an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
Definitions
- the present invention relates to a water-soluble film for liquid detergent packaging capsules and liquid detergent packaging capsules.
- packaging capsules for enclosing liquid detergents such as laundry detergents, dishwashing detergents, and household care compositions
- liquid detergents such as laundry detergents, dishwashing detergents, and household care compositions
- packaging capsules enclosing a liquid detergent are at least partially dissolved in water and the liquid detergent is released to form washing liquid at the start of washing.
- the packaging capsules dissolve in the washing liquid and are discharged together with the washing liquid after washing.
- the following patent document 1 discloses a cross-sectional portion of a predetermined range from the interface of the bonding surface of the water-soluble film made of polyvinyl alcohol resin.
- a packaging capsule containing a predetermined number or more of inorganic particles such as silica having a particle diameter of 2 ⁇ m or more has been proposed.
- the packaging capsule of Patent Literature 1 it is possible to improve the sealing property of the bonding surface of the water-soluble film made of polyvinyl alcohol resin, and when the packaging capsule enclosing the liquid detergent is used for transportation, etc., the bonding portion is A situation such as peeling can be prevented.
- the packaging capsule described in Patent Literature 1 cited above only improves the sealing performance of the bonded surfaces, and damage from locations other than the bonded portions is likely to occur. may occur.
- the present invention solves the above-mentioned problems, and can improve the tensile strength of a water-soluble film made of a polyvinyl alcohol resin even if it is made thinner by blending silica particles, and has good transparency.
- a further object of the present invention is to provide a liquid detergent packaging capsule with improved pressure resistance.
- a water-soluble film for packaging capsules for a liquid detergent that can achieve the above object contains an anion group-modified polyvinyl alcohol resin as a polyvinyl alcohol resin, a plasticizer, and silica particles that have not been hydrophobized, and The silica particles have an average particle diameter of 0.1 to 4.6 ⁇ m and a specific surface area of 10 to 490 m 2 /g, and are contained in an amount of 0.5 to 10 parts by mass based on 100 parts by mass of the polyvinyl alcohol resin.
- the water-soluble film essentially contains anion group-modified polyvinyl alcohol resin as the polyvinyl alcohol resin, and if necessary, cation group-modified polyvinyl alcohol resin, unmodified polyvinyl alcohol resin, and non-modified polyvinyl alcohol resin, as long as the object and solubility of the present invention are not impaired. It may contain polyvinyl alcohol resin.
- the tensile strength of the water-soluble film is 19 MPa or more after storage of the water-soluble film having a thickness of 75 ⁇ m in an environment of a temperature of 40° C. and a humidity of 80% RH for 7 days.
- a water-soluble film for packaging capsules for liquid detergents it is preferable that the thickness is the same as that of the liquid detergent film and the tensile strength is 1.2 times or more that of the control water-soluble film containing no silica particles alone.
- the water-soluble film preferably has a haze of 50% or less as a water-soluble film for packaging capsules for liquid detergents.
- a liquid detergent packaging capsule capable of achieving the above object is a liquid detergent packaging capsule in which a liquid detergent is enclosed in a capsule formed by laminating at least two edges of the water-soluble film described above. 1.2 times or more of the compressive strength of a control liquid detergent packaging capsule formed of a control water-soluble film having the same thickness as that of the water-soluble film and not containing only the silica particles. It is.
- the liquid detergent packaging capsule is characterized by having a compressive strength of 700 N or more.
- the tensile strength of the water-soluble film can be improved more than before, and transparency equivalent to that of the past can be exhibited.
- the pressure resistance strength of the liquid detergent packaging capsule according to the present invention using such a water-soluble film can be improved.
- the transparency of the water-soluble film can be maintained, and the location other than the bonding surface can be used as a starting point. It is possible to suppress breakage of the liquid detergent packaging capsule.
- this water-soluble film for packaging capsules contributes to the reduction of raw materials and the reduction of the environmental burden due to its thinness.
- the water-soluble film for packaging capsules for liquid detergents of the present invention (hereinafter simply referred to as water-soluble film) is mainly formed of anion group-modified polyvinyl alcohol resin.
- anion group-modified polyvinyl alcohol resin a known one can be used.
- the anionic group of this anionic group-modified polyvinyl alcohol is not particularly limited, but examples thereof include a carboxyl group, a sulfonic acid group, a phosphoric acid group and the like.
- anion group-modified polyvinyl alcohol resin examples include, but are not limited to, maleic acid-modified polyvinyl alcohol resin, itaconic acid-modified polyvinyl alcohol resin, acrylic acid-modified polyvinyl alcohol resin, methacrylic acid-modified polyvinyl alcohol resin, 2-acrylamide-2- Examples thereof include methylpropanesulfonic acid-modified polyvinyl alcohol resin and the like.
- the number of moles of the monomer or the like reacted for modification is 0.1 to 10 as a ratio (degree of modification) to the number of moles of all the monomers constituting the anion group-modified polyvinyl alcohol resin.
- It is preferably mol %, more preferably 0.5 to 6.0 mol %, even more preferably 1.0 to 4.3 mol %.
- degree of modification of the anion group-modified polyvinyl alcohol resin is less than 0.1 mol%, the solubility in water tends to decrease, and when it exceeds 10 mol%, the productivity of the anion group-modified polyvinyl alcohol resin decreases. There is a tendency.
- this anion group-modified polyvinyl alcohol resin can be obtained by polymerizing a polymer by a known method such as a solution polymerization method, a bulk polymerization method, or a suspension polymerization method, and then saponifying the polymer. Saponification is carried out using an alkali or an acid, and it is particularly preferred to use an alkali.
- the degree of saponification (average degree of saponification) is not particularly limited, but is preferably in the range of 86 to 100 mol% because it facilitates adjustment of the solubility in water, and more preferably 87 to 99 mol%. It is preferably 88 to 98 mol %, and more preferably 88 to 98 mol %. If the degree of saponification is less than 86 mol %, the water solubility of the anion group-modified polyvinyl alcohol resin tends to decrease.
- the degree of saponification can be measured according to JIS K6726 (1994).
- the anion group-modified polyvinyl alcohol resin used in the present invention may have repeating units composed of the following monomers within a range that does not impair the effects of the present invention.
- monomers include olefins such as ethylene, propylene, isobutylene, ⁇ -octene, ⁇ -dodecene and ⁇ -octadecene, and unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, maleic anhydride and itaconic acid.
- Nitriles such as acrylonitrile and methacrylonitrile, amides such as acrylamide and methacrylamide, alkyl vinyl ethers, N-acrylamidomethyltrimethylammonium chloride, allyltrimethylammonium chloride, dimethyldiallylammonium chloride, dimethylallyl vinyl ketone , N-vinylpyrrolidone, vinyl chloride, vinylidene chloride, polyoxyalkylene (meth)allyl ether such as polyoxyethylene (meth)allyl ether, polyoxypropylene (meth)allyl ether, polyoxyethylene (meth)acrylate, polyoxy Polyoxyalkylene (meth)acrylates such as propylene (meth)acrylate, polyoxyalkylene (meth)acrylamides such as polyoxyethylene (meth)acrylamide, polyoxypropylene (meth)acrylamide, polyoxyethylene (1-(meth)acrylamide -1,1-dimethylpropyl) ester, polyoxyethylene vinyl ether,
- N-acrylamidomethyltrimethylammonium chloride N-acrylamidoethyltrimethylammonium chloride, N-acrylamidopropyltrimethylammonium chloride, 2-acryloxyethyltrimethylammonium chloride, 2-methacryloxyethyltrimethylammonium chloride, 2-hydroxy-3- Cationic group-containing monomers such as methacryloyloxypropyltrimethylammonium chloride, allyltrimethylammonium chloride, methallyltrimethylammonium chloride, 3-butenetrimethylammonium chloride, dimethyldiallylammonium chloride and diethyldiallylammonium chloride are also included.
- the degree of polymerization of the anionic group-modified polyvinyl alcohol resin is preferably 700 or more, more preferably 900 or more, and even more preferably 1200 or more. If the degree of polymerization is less than 700, the mechanical properties of the water-soluble film and the pressure resistance of the finally obtained liquid detergent packaging capsules tend to decrease.
- the upper limit of the degree of polymerization is preferably 2500, more preferably 2200 or less, still more preferably 2000 or less. If the degree of polymerization exceeds 2500, the water solubility of the water-soluble film tends to decrease.
- the viscosity of the 4% by mass aqueous solution of the anion group-modified polyvinyl alcohol resin at 20° C. is not particularly limited, but is preferably 7.0 to 55 mPa s, more preferably 9.0 to 50 mPa s. More preferably, it is up to 35 mPa ⁇ s. If the viscosity of the 4% by mass aqueous solution is less than 7.0 mPa ⁇ s, the mechanical properties of the water-soluble film and the pressure resistance of the finally obtained liquid detergent packaging capsules tend to decrease. If the 4% by mass aqueous solution viscosity exceeds 55 mPa ⁇ s, the water solubility of the water-soluble film tends to decrease. The 4% by mass aqueous solution viscosity is measured according to JIS K6726 (1994).
- the content of the anion group-modified polyvinyl alcohol resin in 100 parts by mass of the water-soluble film of the present invention is preferably 60 to 97 parts by mass because it facilitates adjustment of the water content in the water-soluble film to an appropriate range. If the content is less than 60 parts by mass, the tensile strength of the water-soluble film may be insufficient, and if the content exceeds 97 parts by mass, the flexibility of the water-soluble film may be insufficient.
- anion group-modified polyvinyl alcohol resins may be used in the water-soluble film of the present invention.
- anion group-modified polyvinyl alcohols differing in at least one of molecular weight, degree of polymerization, viscosity of 4% by mass aqueous solution, degree of saponification, degree of modification, modified species, etc. can be employed.
- unmodified polyvinyl alcohol may be contained as necessary within a range that does not impair the object and solubility of the present invention.
- the water-soluble film of the present invention is molded into liquid detergent packaging capsules and is transported, stored, and used in hot and humid regions and cold regions, so high tensile strength and durability are required, and impact resistance at low temperatures is required. Gender is also taken into consideration.
- the water-soluble film of the present invention which requires such properties, can lower the glass transition point, and can also improve the durability at low temperatures and the solubility in water. .
- the tensile modulus can be lowered, and a flexible water-soluble film can be obtained.
- any one commonly used as a plasticizer for water-soluble films can be used without any particular limitation.
- polyhydric alcohols such as glycerin, diglycerin, diethylene glycol, trimethylolpropane, triethylene glycol, dipropylene glycol and propylene glycol
- polyethers such as polypropylene glycol
- examples include phenol derivatives, sugar alcohols such as sorbitol, amide compounds such as N-methylpyrrolidone, polyhydric alcohols such as glycerin, pentaerythritol and sorbitol to which ethylene oxide is added, and polyethylene glycols such as PEG400. These may be used alone or in combination of two or more.
- glycerin, diglycerin, sorbitol, trimethylolpropane, polyethylene glycol, polypropylene glycol, triethylene glycol, dipropylene glycol, and propylene glycol are preferred from the viewpoint of improving water solubility.
- Glycerin, sorbitol, trimethylolpropane, PEG400 are particularly preferred.
- glycerin and sorbitol in combination. It is preferably 0.1 to 5.3, more preferably 1:0.2 to 5.0, and even more preferably 1:0.4 to 4.0.
- the content of these plasticizers is preferably 8 to 55 parts by mass, more preferably 10 to 50 parts by mass, and more preferably 16 to 50 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin. preferable.
- the content of the plasticizer is less than 8 parts by mass, the flexibility of the water-soluble film tends to decrease. Bleed-out tends to occur easily, and the pressure resistance strength of the finally obtained liquid detergent packaging capsule tends to decrease.
- the water-soluble film of the present invention contains silica particles.
- silica particles By containing silica particles, it is possible to improve the tensile strength of the water-soluble film and the pressure resistance strength of the resulting packaging capsule, and also obtain an anti-blocking effect that prevents the films from adhering to each other.
- the silica particles used in the present invention are silica particles that have not been hydrophobized, and silica particles that have been hydrophobized are excluded.
- the silica particles may be natural products or synthetic products (wet method, dry method), but are silica particles whose particle surfaces have not been subjected to hydrophobizing treatment.
- wet silica particles produced by a wet method such as a sedimentation method or a gel method, or dry silica particles produced by a combustion method using a combustion reaction of a silicon compound, and the surface of the particles has not been modified. Particles are preferred.
- Such wet silica particles and dry silica particles are presumed to have hydrophilic groups such as silanol groups on their surfaces.
- hydrophobic silica obtained by hydrophobizing the hydrophilic groups such as silanol groups on the particle surface with a surface treatment agent such as polydimethylsiloxane, methylchlorosilane, and hexamethyldisilazane can be used to improve the tensile strength of a water-soluble film. It is not preferable because neither improvement in strength nor improvement in pressure resistance strength of the finally obtained liquid detergent packaging capsule can be obtained.
- Silica particles used in the present invention have an average particle diameter of 0.1 to 4.6 ⁇ m and a specific surface area of 10 to 490 m 2 /g.
- the average particle size of silica particles is required to be 0.1 to 4.6 ⁇ m, preferably 0.5 to 4.3 ⁇ m, more preferably 1.0 to 4.0 ⁇ m.
- Silica particles with an average particle size of less than 0.1 ⁇ m do not provide anti-blocking effects for the resulting water-soluble film. and transparency, and the pressure resistance strength of the liquid detergent packaging capsules finally obtained also decreases.
- the average particle size of the silica particles is, for example, 1.5 to 4.6 ⁇ m for precipitation silica, 1.7 to 3.9 ⁇ m for gel silica, and 0.15 ⁇ m for combustion silica. .
- the specific surface area of the silica particles should be 10 to 490 m 2 /g, preferably 20 to 400 m 2 /g, more preferably 45 to 300 m 2 /g. With silica particles having a specific surface area of less than 10 m 2 /g, the antiblocking effect of the resulting water-soluble film cannot be obtained. and transparency, and the pressure resistance strength of the liquid detergent packaging capsules finally obtained also decreases.
- the specific surface area of the silica particles is, for example, 45-160 m 2 /g for precipitation silica, 300 m 2 /g for gel silica, and 140-300 m 2 /g for combustion silica.
- the water-soluble film may or may not be coated with powder on one or both sides of the film or embossed to make the surface uneven.
- This average particle size can be measured according to JIS K1150 (1994). Specifically, the average particle size is defined as the cumulative 50% particle size of the cumulative volume distribution obtained by electrical resistance particle size measurement or laser diffraction particle size distribution measurement. Alternatively, the average particle size can be measured according to JIS Z8825 (2013) or JIS Z8823-2 (2016). Specifically, after dispersing the sample with an ultrasonic disperser, etc., it is measured using a particle size distribution meter by the laser diffraction scattering method (JIS Z8825 (2013)) or the centrifugal separation method (JIS Z8823-2 (2016)). It is.
- the specific surface area can be measured according to JIS K1150 (1994). Specifically, a nitrogen adsorption isotherm was determined by the volumetric method, and B. E. T. The formula is to calculate the specific surface area.
- the specific surface area can be measured according to JIS Z8830 (2013). Specifically, nitrogen molecules are adsorbed on the surface of the sample, and the adsorption amount is measured. E. T. The formula is to calculate the specific surface area.
- the content of silica particles in the water-soluble film of the present invention is 0.5 to 10 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin. Furthermore, at this time, it is more preferable that the content is 0.5 to 10 mass parts per 100 mass parts of the anion group-modified polyvinyl alcohol resin. If the content of silica particles is less than 0.5 parts by mass, the tensile strength of the water-soluble film cannot be improved, and the compression strength of the finally obtained liquid detergent packaging capsule cannot be obtained. exceeds 10 parts by mass, the transparency of the water-soluble film is reduced.
- the content of the silica particles is preferably 1.0 to 8.0 parts by mass, more preferably 1.0 to 6.0 parts by mass, based on 100 parts by mass of the polyvinyl alcohol resin. Furthermore, it is 0.5 to 10 parts by mass with respect to 100 parts by mass of the anion group-modified polyvinyl alcohol resin. If the content of silica particles is less than 0.5 parts by mass, the tensile strength of the water-soluble film cannot be improved, and the compression strength of the finally obtained liquid detergent packaging capsule cannot be obtained. exceeds 10 parts by mass, the transparency of the water-soluble film is reduced.
- the content of the silica particles is preferably 1.0 to 8.0 parts by mass, more preferably 1.0 to 6.0 parts by mass with respect to 100 parts by mass of the anion group-modified polyvinyl alcohol resin. .
- the water-soluble film of the present invention may contain antioxidants, surfactants, water-soluble polymers and additives within limits that do not impair the purpose of the present invention.
- antioxidants examples include sulfites such as sodium sulfite, hydrogen sulfites such as sodium hydrogen sulfite, and disulfites such as sodium disulfite. Among them, sodium sulfite is preferred.
- the content of the antioxidant is preferably 0.5 to 2.0 parts by mass with respect to 100 parts by mass of these polyvinyl alcohol resins.
- surfactants include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants.
- surfactants preferred are polyoxyethylene lauryl ether acetic acid sodium salt, polyoxyethylene alkyl ether phosphate potassium salt, and di-2-ethylhexyl sulfosuccinic acid sodium salt. These may be used alone or in combination.
- the content of the surfactant is preferably 0.1 to 2.0 parts by mass with respect to 100 parts by mass of these polyvinyl alcohol resins.
- the surfactant imparts releasability from the cast surface during production of the water-soluble film, and facilitates processing such as sealing (water-adhesive sealing, heat sealing) when producing liquid detergent packaging capsules. can be done.
- water-soluble polymers examples include sodium polyacrylate, polyethylene oxide, polyvinylpyrrolidone, dextrin, chitosan, chitin, methylcellulose, and hydroxyethylcellulose.
- Additives include, for example, hydrophobic silica, aluminosilicate (zeolite), titanium oxide, talc, starch, various fillers such as crosslinked acrylic fine particles, colorants, fragrances, bulking agents, antifoaming agents, release agents, and ultraviolet absorbers. , rust inhibitors, liquid paraffins, fluorescent brightening agents, chelating agents, bittering agents such as denatonium benzoate, fatty acid-based substances, inorganic powders, and the like.
- particles (filler) other than silica particles may or may not be contained in the water-soluble film within a range that does not impair the effects of the present invention.
- the moisture content of the water-soluble film of the present invention obtained by film formation is preferably 4.0 to 9.0% by mass, more preferably 5.5 to 8.0, under normal temperature, pressure and humidity conditions. % by mass is more preferable, and 5.5 to 7.5% by mass is even more preferable. If the moisture content is less than 4.0% by mass, the flexibility of the water-soluble film tends to decrease, and if the moisture content exceeds 9.0% by mass, the water-soluble films tend to adhere to each other.
- the thickness of the water-soluble film of the present invention obtained by film formation is preferably 40-120 ⁇ m, more preferably 50-110 ⁇ m, even more preferably 60-90 ⁇ m.
- a water-soluble film with a thickness of less than 40 ⁇ m tends to have insufficient tensile strength for liquid detergent packaging capsules. and water-solubility tend to decrease.
- the obtained water-soluble film has a haze of 50% or less as measured according to JIS K7136 (2000) because it has good transparency.
- a water-soluble film having a haze of more than 50% tends to be inferior in transparency and design.
- the obtained water-soluble film of the present invention has a tensile strength of 19 MPa or more after storage of a 75 ⁇ m thick water-soluble film at a temperature of 40 ° C. and a humidity of 80% RH for 7 days. Thickness and having a tensile strength 1.2 times or more than the tensile strength of the control water-soluble film containing no silica particles alone proves that the liquid detergent is applied to the packaging capsule made of the water-soluble film. It is preferable because it can withstand transportation and storage in a filled state.
- the water-soluble film of the present invention contains silica particles that have not been hydrophobized, are fine, and have an average particle diameter and a specific surface area within a predetermined range.
- the molecular chains of the anion group-modified polyvinyl alcohol resin and the hydrophilic groups such as hydroxyl groups on the surface of the silica particles are hydrogen-bonded to form a strong network structure. It is presumed that the tensile strength can be improved even if the elastic film is made thinner, and the compression strength of the finally obtained liquid detergent packaging capsule can also be improved.
- hydrophobic silica that has been subjected to a hydrophobizing treatment and does not substantially have a hydrophilic group such as a hydroxyl group on the surface does not exhibit the effect of improving tensile strength like the water-soluble film of the present invention.
- particles (fillers) that do not form hydrogen bonds with anion group-modified polyvinyl alcohol resins such as titanium oxide and starch do not have the effect of improving the tensile strength of the water-soluble film.
- the water-soluble film of the present invention contains fine and small amounts of silica particles, it is presumed that the transparency of transmitted light is less scattered and can be maintained.
- the water-soluble film of the present invention may be formed from only one layer, or may be formed by laminating two or more layers of the same or different water-soluble films having the composition of the water-soluble film of the present invention.
- a liquid detergent packaging capsule using the water-soluble film of the present invention is a capsule formed by pasting together the edges of at least two sheets of the water-soluble film of the present invention, and contains a liquid detergent. It is.
- Liquid detergent packaging capsules are produced by filling and sealing contents by heat sealing or water sealing.
- the liquid detergent packaging capsule is preferably formed by a thermoforming method or a vertical form-fill-seal (FFS) method, more preferably by a thermoforming method.
- This method for producing a water-soluble film has a step of preparing an aqueous solution and a film-forming step of producing a water-soluble film.
- the step of preparing the aqueous solution does not particularly limit the method of preparing the aqueous solution.
- a method of kneading a water-containing polyvinyl alcohol resin with additives such as a plasticizer, a surfactant and a filler using an extruder for example, a method of kneading a water-containing polyvinyl alcohol resin with additives such as a plasticizer, a surfactant and a filler using an extruder.
- the process of producing a water-soluble film does not particularly limit the method of producing a water-soluble film made of polyvinyl alcohol resin, but for example, a rotating metal roll surface (metal belt An aqueous solution or an aqueous solvent solution of a composition of a water-soluble film made of polyvinyl alcohol resin is supplied to the surface) and dried, while peeling and winding from the surface of the metal roll (including the surface of the metal belt).
- a method of taking can be adopted.
- known means such as a solution casting method (casting method) and a roll coating method can be employed.
- the water-soluble film may be subjected to embossing, for example, matte embossing, by heating and pressing between biaxial rollers having embossed uneven shapes on the surface to form an embossed pattern.
- Liquid detergent packaging capsules produced by a thermoforming method are formed, for example, by following the water-soluble film along the inner wall surface of a cavity of a predetermined volume formed in a mold to form a bottom water-soluble film having a recess of a predetermined volume. After molding, the depression is filled with a predetermined amount of liquid detergent, then a predetermined amount of water is applied to one side of the top water-soluble film made of a water-soluble film, and the bottom water located on the periphery of the cavity of the mold is applied. It can be produced by pressing a predetermined surface of the soluble film and a water-coated surface of the top water-soluble film. In addition, the depth of the liquid detergent packaging capsule can be appropriately adjusted within a range that can withstand deep drawing.
- the liquid detergent packaging capsule produced by the FFS method is obtained by folding the water-soluble film vertically, sealing the overlapping edges vertically and horizontally by heating, and then filling the liquid detergent into the folded water-soluble film and filling the upper portion thereof. can be manufactured by sealing the
- liquid detergent packaging capsule of the present invention may enclose a liquid detergent and a powder detergent and/or gel.
- a single agent may be enclosed and packaged, or two or more agents may be separately enclosed and packaged to form a single package type multi-chamber detergent packaging capsule.
- the liquid detergent packaging capsules of the present invention obtained in this manner had a compression strength of 1.0% relative to the control liquid detergent packaging capsules formed of the control water-soluble film having the same thickness and not containing only the silica particles. It has more than double the pressure resistance. Furthermore, it is preferable that the pressure resistance strength is 700 N or more. According to the liquid detergent packaging capsule of the present invention, even when the thickness of the water-soluble film forming the liquid detergent packaging capsule is reduced or the shape of the liquid detergent packaging capsule is complicated, the transparency of the water-soluble film is maintained. While doing so, it is possible to prevent the liquid detergent packaging capsule from being damaged from a point other than the bonding surface.
- the compressive strength of the liquid detergent packaging capsule refers to the maximum compressive force until the liquid detergent packaging capsule is compressed and bursts.
- modified PVA resin a maleic acid-modified polyvinyl alcohol resin having a degree of modification, a degree of polymerization, an average degree of saponification, and a viscosity of 4% by mass aqueous solution at 20° C. (hereinafter referred to as 4% by mass viscosity) shown in Table 1 below was used.
- Plasticizer B-1 Glycerin B-2: Sorbitol Other additives
- Antioxidant C-1 Sodium sulfite Surfactant
- D-1 Polyoxyethylene lauryl ether acetate sodium salt
- D-2 Polyoxyethylene alkyl ether phosphate Potassium salt
- D-3 Di-2-ethylhexyl sulfosuccinate sodium salt
- Example 1 preparation of composition for water-soluble film
- Table 2 a water-soluble film composition comprising the plasticizer, antioxidant, surfactant, particles and water described above was prepared.
- Table 2 also shows the blending amounts of the plasticizer, antioxidant, and surfactant, the type of particles, the average particle diameter, the specific surface area, and the blending amounts.
- a water-soluble film composition containing only no silica particles was prepared as a control and shown in Table 2 as Ref. The amount of water was adjusted so that the viscosity of the water-soluble film composition (measured with a Brookfield viscometer at 85° C.) was 3000 mPa ⁇ s.
- a water-soluble film composition having the composition shown in Table 2 and having a viscosity of 3000 mPa ⁇ s measured at 85° C. with a Brookfield viscometer was prepared.
- a metal roll having a smooth surface was prepared as the casting surface, and the surface was cleaned by wiping with a cloth moistened with pure water.
- the water-soluble film composition having the composition shown in Table 2 was cast onto the surface of the metal roll. It was dried for 8 minutes while rotating the metal roll to form a water-soluble film having a thickness of 75 ⁇ m. At this time, the water-soluble film surface in contact with the metal roll is the cast surface, and the water-soluble film surface in direct contact with air is the air surface.
- Liquid detergent TOP SUPER NANOX (manufactured by Lion Corporation: trade name) is 62.5% by mass, and polyoxyethylene monolaurate (manufactured by Kao Corporation: Emanone 1112) is 37.5% by mass, for a total of 100% by mass.
- a liquid detergent was prepared. The moisture content of the prepared liquid detergent was measured using a Karl Fischer moisture analyzer AQV-2200s (manufactured by Hiranuma Sangyo Co., Ltd.: trade name). The moisture content of the prepared liquid detergent was 22% by mass.
- the second water-soluble film is used as a top water-soluble film, and the air side (the side that is directly in contact with air during film formation) is moistened with water. ) was used to apply water, and the amount of water was adjusted to 44 to 54 g/m 2 .
- the water-applied surface of the top water-soluble film and the recessed peripheral surface (air surface side) of the bottom water-soluble film set in the cavity and filled with the liquid detergent were rolled using a 1.5 kg metal roll. After the two films were pressed and bonded together, they were held for about 1 minute and 30 seconds. Furthermore, the vacuum was stopped and the packaging capsule was taken out from the cavity to produce a liquid detergent packaging capsule.
- the tensile strength of the formed water-soluble film and the degree of improvement in the tensile strength, the compressive strength of the prepared liquid detergent packaging capsules and the degree of improvement in the compressive strength were measured by the following measurement methods, and the results are shown in Table 3.
- Measurement method 1. Measurement method of tensile strength of water-soluble film After storing the obtained water-soluble film for 7 days in an environment with a temperature of 40 ° C. and a humidity of 80% RH, a tensile tester AGS-1kN (manufactured by Shimadzu Corporation: trade name) was used to measure the tensile strength based on JIS K7127 (1999). The measurement conditions are as follows. Measurement environment: 23°C, 50% RH Film test piece: width 15 mm x length 150 mm Distance between chucks: 100mm Tensile test speed: 300mm/min
- the prepared liquid detergent package capsules were stored for 30 minutes at a temperature of 23° C. and a humidity of 50% RH.
- the liquid detergent packaging capsule after storage is loosely wrapped in a 20 ⁇ m low-density polyethylene bag as an outer packaging for preventing the contents from scattering, and compressed using a tensile tester AGS-1kN (manufactured by Shimadzu Corporation: trade name). , the maximum compressive force until the liquid detergent packaging capsule bursts was measured.
- the measurement conditions are as follows. Measurement environment: 23°C, 50% RH Distance between chucks: 50mm Compression test speed: 150mm/min
- the water-soluble film of No. 1 to 15 has an average particle diameter of 0.1 to 4.6 ⁇ m and a specific surface area of 10 to 490 m 2 /g, and is composed of unhydrophobicized precipitated silica particles, gel silica particles, and Since 0.5 to 10 parts by mass of the combustion silica particles are contained with respect to 100 parts by mass of the modified PVA resin, the tensile strength of the control water-soluble film is 19 MPa or more and does not contain only Ref 1 silica particles. The improvement in tensile strength is 1.2 times or more. Moreover, the haze is 50% or less and the transparency is also good. Also, No.
- the liquid detergent packaging capsules using the water-soluble films of 1 to 15 also have a pressure resistance of 700 N or more and the degree of improvement in pressure resistance against the liquid detergent packaging capsules using the control water-soluble film containing only the silica particles of Ref 1. 1.2 times or more.
- the average particle size of the blended silica particles exceeds 4.6 ⁇ m. 17 * , No. with a specific surface area exceeding 490 m 2 /g. 18 * , no.
- the 19 * water-soluble film has a haze of 50% or less and good transparency, but a tensile strength of less than 19 MPa, compared to the tensile strength of the control water-soluble film containing only Ref 1 silica particles. is also less than 1.2 times. Also, No. 17 * , no. 18 * , no.
- Liquid detergent packaging capsules using a 19 * water-soluble film also have a compressive strength of less than 700 N, and the degree of improvement in compressive strength is also 1 compared to liquid detergent packaging capsules using a control water-soluble film that does not contain only Ref 1 silica particles. less than .2 times.
- the silica particles No. 2 using hydrophobic silica particles having a specific surface area of 10 to 490 m 2 /g.
- the tensile strength of the resulting water-soluble film is less than 19 MPa and the improvement over the tensile strength of the control water-soluble film containing only Ref 1 silica particles is less than 1.2 times, and the haze is also It exceeds 50% and lacks transparency.
- No. The liquid detergent packaging capsules using the 21 * water-soluble film also have a pressure resistance of less than 700 N, and the improvement in pressure strength is also 1 compared to the liquid detergent packaging capsules using the control water-soluble film containing only Ref 1 silica particles. less than .2 times.
- the tensile strength of the resulting water-soluble film is less than 19 MPa and the improvement is less than 1.2 times the tensile strength of the control water-soluble film containing only Ref 1 silica particles.
- . 23 * has a haze of more than 50% and lacks transparency. Also, No. 22 * , no. 23 * , No. 24 * , No. 25 * , no.
- Liquid detergent packaging capsules using any of the 26 * water-soluble films have a compressive strength of less than 700 N, and the degree of improvement in compressive strength compared to liquid detergent packaging capsules using a control water-soluble film containing only Ref 1 silica particles. is also less than 1.2 times.
- No. 1, which is an embodiment, 1-15 No.
- the moisture content of the water-soluble film was 23.1 to 27.2% by mass after storage for 7 days in an environment of 16 * to 26 * and Ref 1 at a temperature of 40°C and a humidity of 80% RH.
- No. 1-15 No.
- the moisture content of the water-soluble film after storage for 7 days in an environment of 16 * to 26 * and Ref1 at a temperature of 40° C. and a humidity of 80% RH was almost the same value.
- Example 2 A water-soluble film composition comprising a modified PVA resin, a plasticizer, an antioxidant, a surfactant, particles and water shown in Table 4 was kneaded in a water-containing state using a twin-screw extruder to form a water-soluble film composition. was adjusted to a concentration of 46 to 48% by mass. Table 4 also shows the blending amounts of the modified PVA resin, plasticizer, antioxidant and surfactant, the type of particles, the average particle size, the specific surface area, and the blending amounts.
- a water-soluble film composition prepared to have the composition shown in Table 4 was cast from a T-die onto a metal roll surface (first drying roll) whose surface temperature was kept at 86°C. . While rotating the metal roll (first drying roll), it is dried for 80 seconds, peeled off from the first drying roll, and one side and the other side of the PVA film are alternately in contact with each drying roll. It was dried by the second drying roll and thereafter to form a water-soluble film having a thickness of 75 ⁇ m.
- the tensile strength and haze of the produced water-soluble film and the degree of improvement with respect to the tensile strength of the control water-soluble film containing only Ref2 and Ref3 silica particles were measured in the same manner as in Example 1.
- Table 5 shows the results. Furthermore, liquid detergent packaging capsules were prepared in the same manner as in Example 1 using the obtained water-soluble film, and liquid detergent packaging using a control water-soluble film containing only the silica particles of Ref2 and Ref3. The degree of improvement in compressive strength of the capsule was also measured in the same manner as in Example 1, and the results are also shown in Table 5.
- No. 1 which is an example, 27, No.
- the water-soluble film of No. 28 has a tensile strength of 19 MPa or more, and the tensile strength is improved by 1.2 times or more as compared with the control water-soluble films containing only silica particles of Ref2 and Ref3. Moreover, the haze is 50% or less and the transparency is also good. Also, No. 27, No.
- the liquid detergent packaging capsules using the water-soluble film of No. 28 also have a compressive strength of 700 N or more, and the degree of improvement in compressive strength compared to the liquid detergent packaging capsules using the control water-soluble films that do not contain only silica particles of Ref2 and Ref3. 1.2 times or more.
- the moisture content of the water-soluble film after being stored for 7 days under the environment of temperature 40° C. and humidity 80% RH is the same as that of Example No. 27 is 24.9% by mass; 28 was 23.2% by mass, Ref2 was 24.7% by mass, and Ref3 was 24.0% by mass.
- the moisture content of the water-soluble films was substantially the same value.
- Example 3 A water-soluble film composition comprising modified PVA resin, plasticizer, antioxidant, surfactant, particles and water shown in Table 6 was prepared in the same manner as in Example 1. Table 6 also shows the blending amounts of the modified PVA resin, plasticizer, antioxidant and surfactant, the type of particles, the average particle diameter, the specific surface area, and the blending amounts.
- a control water-soluble film containing only silica particles of tensile strength, haze and Ref 4 of a water-soluble film obtained by forming a water-soluble film composition prepared to the composition shown in Table 6 in the same manner as in Example 1 The degree of improvement in tensile strength was measured in the same manner as in Example 1, and the results are shown in Table 7. Furthermore, using the obtained water-soluble film, liquid detergent packaging capsules were produced in the same manner as in Example 1, and the compressive strength and liquid detergent packaging capsules using a control water-soluble film containing only Ref 4 silica particles were obtained. The degree of improvement in compressive strength was also measured in the same manner as in Example 1, and the results are also shown in Table 7.
- the water-soluble film of No. 29 has a tensile strength of 19 MPa or more and an improvement of 1.2 times or more over the tensile strength of the control water-soluble film containing only Ref 4 silica particles. Moreover, the haze is 50% or less and the transparency is also good. Also, No. The liquid detergent packaging capsules using the water-soluble film of No. 29 also have a compressive strength of 700 N or more, and the degree of improvement in compressive strength compared to the liquid detergent packaging capsules using the control water-soluble film containing only Ref silica particles is also 1. more than twice. Incidentally, the moisture content of the water-soluble film after being stored for 7 days under the environment of temperature 40° C.
- Example No. 29 was 23.1% by mass, and Ref4 was 22.9% by mass.
- No. 29 and Ref 4 after being stored for 7 days in an environment of a temperature of 40° C. and a humidity of 80% RH, the moisture contents of the water-soluble films were substantially the same.
- Example 4 A water-soluble film composition comprising modified PVA resin, plasticizer, antioxidant, surfactant, particles and water shown in Table 8 was prepared in the same manner as in Example 1. Table 8 also shows the blending amounts of the modified PVA resin, plasticizer, antioxidant and surfactant, the type of particles, the average particle diameter, the specific surface area, and the blending amounts.
- a control water-soluble film containing only silica particles of tensile strength, haze and Ref 5 of a water-soluble film obtained by forming a water-soluble film composition prepared to the composition shown in Table 8 in the same manner as in Example 1 The degree of improvement in tensile strength was measured in the same manner as in Example 1, and the results are shown in Table 9. Furthermore, using the obtained water-soluble film, liquid detergent packaging capsules were produced in the same manner as in Example 1, and the compressive strength and Ref 5 of the liquid detergent packaging capsules using the control water-soluble film containing no silica particles only. The degree of improvement in compressive strength was also measured in the same manner as in Example 1, and the results are also shown in Table 9.
- the water-soluble film of No. 30 has a tensile strength of 19 MPa or more and an improvement of 1.2 times or more over the tensile strength of the control water-soluble film containing only Ref 5 silica particles. Moreover, the haze is 50% or less and the transparency is also good. Also, No. The liquid detergent packaging capsule using the water-soluble film of No. 30 also has a compressive strength of 700 N or more, and the degree of improvement in compressive strength against the liquid detergent packaging capsule using the control water-soluble film containing only Ref 5 silica particles is also 1. more than twice. Incidentally, the moisture content of the water-soluble film after being stored for 7 days under the environment of temperature 40° C.
- Example No. 30 was 22.0% by mass, and Ref5 was 21.7% by mass. In this way No. 30 and Ref 5, the water content of the water-soluble film after storage for 7 days under the environment of temperature 40° C. and humidity 80% RH was almost the same value.
- Example 5 As shown in Table 10, 100 parts by mass of A-2 among the modified PVA resins shown in Table 1 is used, and a water-soluble film composition comprising a plasticizer, an antioxidant, a surfactant, particles and water shown in Table 10. was prepared analogously to Example 1. Table 10 also shows the blending amounts of the plasticizer, antioxidant, and surfactant, the type of particles, the average particle diameter, the specific surface area, and the blending amounts.
- Comparative water-soluble film containing only silica particles of tensile strength, haze and Ref 6 of a water-soluble film obtained by forming a water-soluble film composition prepared to the composition shown in Table 10 in the same manner as in Example 1 The degree of improvement in tensile strength was measured in the same manner as in Example 1, and the results are shown in Table 11. Furthermore, using the obtained water-soluble film, a liquid detergent packaging capsule was produced in the same manner as in Example 1, and the pressure strength and the liquid detergent packaging capsule using a control water-soluble film containing only Ref 6 silica particles were obtained. The degree of improvement in compressive strength was also measured in the same manner as in Example 1, and the results are also shown in Table 11.
- No. 1 which is an example. 31, No.
- the water-soluble film of No. 32 has a tensile strength of 19 MPa or more and an improvement of 1.2 times or more over the tensile strength of the control water-soluble film containing only Ref 6 silica particles. Moreover, the haze is 50% or less and the transparency is also good. Also, No. 31, No.
- the liquid detergent packaging capsules using any of the 32 water-soluble films have a pressure resistance of 700 N or more, and the degree of improvement in pressure resistance compared to the liquid detergent packaging capsules using the control water-soluble film containing only Ref 6 silica particles. 1.2 times or more.
- the moisture content of the water-soluble film after being stored for 7 days under the environment of temperature 40° C. and humidity 80% RH is the same as that of Example No. 31 is 26.5% by mass; 32 was 26.2% by mass, and Ref6 was 26.0% by mass. In this way No. 31, No. 32 and Ref 6, the water content of the water-soluble film after storage for 7 days under the environment of temperature 40° C. and humidity 80% RH was almost the same value.
- the water-soluble film according to the present invention can be used as liquid detergent packaging capsules with improved design.
- Liquid detergent packaging capsules using the water-soluble film of the present invention can be used as commercial or household detergents with improved design.
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Abstract
Description
アニオン基変性ポリビニルアルコール樹脂としては、特に限定されないが、例えば、マレイン酸変性ポリビニルアルコール樹脂、イタコン酸変性ポリビニルアルコール樹脂、アクリル酸変性ポリビニルアルコール樹脂、メタクリル酸変性ポリビニルアルコール樹脂、2-アクリルアミド-2-メチルプロパンスルホン酸変性ポリビニルアルコール樹脂等が挙げられる。
このアニオン基変性ポリビニルアルコール樹脂は、変性のために反応されたモノマー等のモル数が、アニオン基変性ポリビニルアルコール樹脂を構成する全モノマーのモル数に対する比率(変性度)として、0.1~10モル%であることが好ましく、0.5~6.0モル%であることがより好ましく、1.0~4.3モル%であることが更に好ましい。アニオン基変性ポリビニルアルコール樹脂の変性度が0.1モル%未満の場合、水への溶解性が低下する傾向にあり、10モル%を超える場合、アニオン基変性ポリビニルアルコール樹脂の生産性が低下する傾向にある。
本発明で用いるシリカ粒子は、疎水化未処理のシリカ粒子であって、疎水化処理されたシリカ粒子は除かれる。このシリカ粒子としては、天然品、合成品(湿式法、乾式法)であってもよいが、粒子表面に疎水化処理が施されていないシリカ粒子である。特に、沈降法やゲル法等の湿式法で製造された湿式シリカ粒子、若しくはケイ素化合物の燃焼反応による燃焼法で製造された乾式シリカ粒子であって、粒子表面の改質が未処理であるシリカ粒子が好ましい。このような湿式シリカ粒子や乾式シリカ粒子は、その表面にシラノール基等の親水基を有するものと推察される。湿式シリカ粒子であっても、粒子表面のシラノール基等の親水基をポリジメチルシロキサンやメチルクロロシラン及びヘキサメチルジシラザン等の表面処理剤により疎水化処理を施した疎水性シリカは水溶性フィルムの引張強度の向上や最終的に得られる液体洗剤包装カプセルの耐圧強度の向上が得られず好ましくない。
さらに必要に応じて、水溶性フィルムを、エンボス加工、例えばマットエンボス加工をするには、表面にエンボス凹凸形状を有する二軸ローラー間で加熱・押圧しながらエンボス模様を付してもよい。
このような本発明の液体洗剤包装カプセルによれば、液体洗剤包装カプセルを形成する水溶性フィルムの薄肉化や液体洗剤包装カプセル形状を複雑化させた場合においても、水溶性フィルムの透明性を維持しつつ、貼り合せ面以外の箇所を起点に液体洗剤包装カプセルが破損することを抑制できる。
変性PVA樹脂として、変性度、重合度、平均ケン化度、20℃における4質量%水溶液粘度(以下、4質量%粘度と称する)が下記表1に示すマレイン酸変性ポリビニルアルコール樹脂を用いた。
可塑剤
B-1:グリセリン
B-2:ソルビトール
その他の添加剤
酸化防止剤
C-1:亜硫酸ナトリウム
界面活性剤
D-1:ポリオキシエチレンラウリルエーテル酢酸ナトリウム塩
D-2:ポリオキシエチレンアルキルエーテルホスフェートカリウム塩
D-3:ジ-2-エチルヘキシルスルホコハク酸ナトリウム塩
(水溶性フィルム用組成物の調製)
表2に示すように、表1に示す変性PVA樹脂のうちA-1を100質量部用い、上述した可塑剤、酸化防止剤、界面活性剤、粒子及び水から成る水溶性フィルム用組成物を調製した。可塑剤、酸化防止剤及び界面活性剤の配合量、粒子の種類、平均粒子径、比表面積、配合量を表2に併記した。シリカ粒子のみを配合しなかった水溶性フィルム用組成物を比較対照物として調製して表2にRefとして示した。尚、水の量は、水溶性フィルム用組成物の粘度(85℃でB型粘度計により測定)が3000mPa・sとなるように調製した。
(1-1)沈降法シリカの平均粒子径
電気抵抗式粒度測定を用いてJIS K1150(1994)に準拠して測定した累積体積分布の累積50%の粒子径である。
(1-2)ゲル法シリカ及び疎水性シリカの平均粒子径
レーザー回折式粒度測定装置を用いてJIS K1150(1994)に準拠して測定した累積体積分布の累積50%の粒子径である。
(1-3)燃焼法シリカの平均粒子径
超音波分散機等で分散後、レーザー回折散乱法(JIS Z8825(2013))又は遠心分離法(JIS Z8823-2(2016))により粒度分布計を用いて測定した累積体積分布の累積50%の粒子径である。
(2-1)沈降法シリカ粒子、ゲル法シリカ粒子及び疎水性シリカ粒子の比表面積
JIS K1150(1994)に準拠して窒素吸着等温線を容量法で求め、B.E.T.式を用いて計算したものである。
(2-2)燃焼法シリカ粒子の比表面積
JIS Z8830(2013)に準じ、試料表面に窒素分子を吸着させ、吸着量を測定し、B.E.T.式を用いて計算したものである。
表2に示す組成で且つ85℃でB型粘度計により測定した粘度が3000mPa・sに調製した水溶性フィルム用組成物を用意した。そして、キャスト表面として表面が平滑な金属ロールを用意し、その表面を純水で湿らせた布で拭いて清浄した。次いで、金属ロールの表面温度を約80℃に加熱しつつ、表2に示す組成の水溶性フィルム用組成物を金属ロール表面にキャストした。金属ロールを回転させながら、8分間乾燥させて、厚さ75μmの水溶性フィルムを製膜した。
このとき、金属ロールと接している側の水溶性フィルム面がキャスト面、直接空気に触れている側の水溶性フィルム面がエア面である。
液体洗剤のトップ SUPER NANOX(ライオン株式会社製:商品名)を62.5質量%、ポリオキシエチレンモノラウレート(花王株式会社製:エマノーン1112)を37.5質量%の合計100質量%からなる液体洗剤を調製した。調製した液体洗剤の水分率をカールフィッシャー法水分測定装置AQV-2200s(平沼産業株式会社製:商品名)を用いて測定した。調製した液体洗剤の水分率は22質量%であった。
製膜した厚さ75μmの水溶性フィルムの二枚を用いて包装カプセルを成形した。一枚目の水溶性フィルムを、シワやタルミがないように張った状態で、キャビティ(開口部面積2000mm2、深さ15mmの丸みを帯びた角を有する箱形状の空洞)を有する金型上に、水溶性フィルムのキャスト面側(製膜時に金属ロールと接している側の面)がキャビティの内壁面側となるようにセットした。その水溶性フィルムを約90℃、5秒間加熱し、真空成形によりキャビティに水溶性フィルムを追従させ、窪みを有するボトム用水溶性フィルムを成形した後、その窪みに予め調製した液体洗剤を約22mL充填した。次いで、二枚目の水溶性フィルムをトップ用水溶性フィルムとし、そのエア面側(製膜時に直接空気に触れている側の面)に水で湿らせたラボタオル(株式会社ユニケミー社製:商品名)を用いて水を塗布し、水量が44~54g/m2となるように調整した。その後、トップ用水溶性フィルムの水塗布面と、キャビティにセットされて窪みに液体洗剤が充填されているボトム用水溶性フィルムの窪み周縁面(エア面側)とを、1.5kgの金属ロールを用いて圧着させて貼り合わせた後、約1分30秒間保持した。更に、真空引きを止め、キャビティから包装カプセルを取り出し、液体洗剤包装カプセルを作製した。
1.水溶性フィルムの引張強度の測定方法
得られた水溶性フィルムを温度40℃、湿度80%RHの環境下で7日間保管した後に、引張試験機AGS-1kN(株式会社島津製作所製:商品名)を用いてJIS K7127(1999)に基づいて引張強度を測定した。測定条件は以下の通りである。
測定環境:23℃、50%RH
フィルム試験片:幅15mm×長さ150mm
チャック間距離:100mm
引張試験スピード:300mm/分
表2のNo.1~15、No.16*~26*の水溶性フィルム用組成物を用いて製膜した水溶性フィルムの引張強度の向上度は、表2のRef1のシリカ粒子のみが非含有の水溶性フィルム用組成物を用いて製膜した対照水溶性フィルムの引張強度を基準として算出した。
得られた水溶性フィルムのヘーズを、ヘーズメーターNDH 5000(日本電色工業株式会社製:商品名)を用いてJIS K7136(2000)に準拠して測定した。
作製した液体洗剤包装カプセルを温度23℃、湿度50%RH環境下で30分間保管した。保管後の液体洗剤包装カプセルを内容液飛散防止用の外装として、20μmの低密度ポリエチレン製の袋でゆったり包み、引張試験機AGS-1kN(株式会社島津製作所製:商品名)を用いて圧縮し、液体洗剤包装カプセルが破裂するまでの最大圧縮力を測定した。測定条件は以下の通りである。
測定環境:23℃、50%RH
チャック間距離:50mm
圧縮試験スピード:150mm/分
表2のNo.1~15、No.16*~26*の水溶性フィルム用組成物を用いて製膜した水溶性フィルムによる液体洗剤包装カプセルの耐圧強度の向上度は、表2のRef1のシリカ粒子のみが非含有の水溶性フィルム用組成物を用いて製膜した対照水溶性フィルムによる液体洗剤包装カプセルの耐圧強度を基準として算出した。
表4に示す変性PVA樹脂、可塑剤、酸化防止剤、界面活性剤、粒子及び水から成る水溶性フィルム用組成物は二軸押出機を用いて含水状態で混錬して水溶性フィルム組成物の濃度が46~48質量%となるように調整した。変性PVA樹脂、可塑剤、酸化防止剤及び界面活性剤の配合量、粒子の種類、平均粒子径、比表面積、配合量を表4に併記した。
尚、温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は、実施例であるNo.27は24.9質量%、No.28は23.2質量%、Ref2は24.7質量%、Ref3は24.0質量%であった。このようにNo.27、No.28およびRef2、Ref3の温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は略同一の値であった。
表6に示す変性PVA樹脂、可塑剤、酸化防止剤、界面活性剤、粒子及び水から成る水溶性フィルム用組成物を実施例1と同様にして調製した。変性PVA樹脂、可塑剤、酸化防止剤及び界面活性剤の配合量、粒子の種類、平均粒子径、比表面積、配合量を表6に併記した。
尚、温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は、実施例であるNo.29は23.1質量%、Ref4は22.9質量%であった。このようにNo.29及びRef4の温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は略同一の値であった。
表8に示す変性PVA樹脂、可塑剤、酸化防止剤、界面活性剤、粒子及び水から成る水溶性フィルム用組成物を実施例1と同様にして調製した。変性PVA樹脂、可塑剤、酸化防止剤及び界面活性剤の配合量、粒子の種類、平均粒子径、比表面積、配合量を表8に併記した。
尚、温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は、実施例であるNo.30は22.0質量%、Ref5は21.7質量%であった。このようにNo.30及びRef5の温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は略同一の値であった。
表10に示すように、表1の変性PVA樹脂のうちA-2を100質量部用い、表10に示す可塑剤、酸化防止剤、界面活性剤、粒子及び水から成る水溶性フィルム用組成物を実施例1と同様にして調製した。可塑剤、酸化防止剤及び界面活性剤の配合量、粒子の種類、平均粒子径、比表面積、配合量を表10に併記した。
尚、温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は、実施例であるNo.31は26.5質量%、No.32は26.2質量%、Ref6は26.0質量%であった。このようにNo.31、No.32及びRef6の温度40℃、湿度80%RHの環境下で7日間保管した後の水溶性フィルムの水分率は略同一の値であった。
Claims (6)
- ポリビニルアルコール樹脂としてアニオン基変性ポリビニルアルコール樹脂と、可塑剤と、疎水化未処理のシリカ粒子とが含有されており、
前記シリカ粒子は、平均粒子径が0.1~4.6μmで且つ比表面積が10~490m2/gであって、前記ポリビニルアルコール樹脂100質量部に対して0.5~10質量部含有されていることを特徴とする液体洗剤の包装カプセル用水溶性フィルム。 - 前記可塑剤が、前記ポリビニルアルコール樹脂100質量部に対して8~55質量部含有されていることを特徴とする請求項1に記載の液体洗剤の包装カプセル用水溶性フィルム。
- 前記水溶性フィルムの引張強度は、厚さ75μmの前記水溶性フィルムを温度40℃で湿度80%RHの環境下で7日間保管後の水溶性フィルムの引張強度が19MPa以上であり、且つ前記水溶性フィルムと同一厚さであって、前記シリカ粒子のみが非含有の対照水溶性フィルムの引張強度に対して1.2倍以上であることを特徴とする請求項1に記載の液体洗剤の包装カプセル用水溶性フィルム。
- 前記水溶性フィルムのヘーズが50%以下であることを特徴とする請求項1に記載の液体洗剤の包装カプセル用水溶性フィルム。
- 請求項1~4のいずれかに記載の水溶性フィルムの少なくとも二枚の端縁が貼り合わされて形成されたカプセル内に液体洗剤が内包された液体洗剤包装カプセルであって、
前記水溶性フィルムと同一厚さで且つ前記シリカ粒子のみが非含有の対照水溶性フィルムで形成された対照液体洗剤包装カプセルの耐圧強度に対して1.2倍以上であることを特徴とする液体洗剤包装カプセル。 - 前記液体洗剤包装カプセルの耐圧強度が、700N以上であることを特徴とする請求項5に記載の液体洗剤包装カプセル。
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| CN202280078830.9A CN118317908A (zh) | 2021-11-30 | 2022-11-28 | 液体洗涤剂的包装胶囊用水溶性膜和液体洗涤剂包装胶囊 |
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