WO2023276844A1 - 温水溶解性雄型面ファスナーおよびその製造方法 - Google Patents
温水溶解性雄型面ファスナーおよびその製造方法 Download PDFInfo
- Publication number
- WO2023276844A1 WO2023276844A1 PCT/JP2022/025031 JP2022025031W WO2023276844A1 WO 2023276844 A1 WO2023276844 A1 WO 2023276844A1 JP 2022025031 W JP2022025031 W JP 2022025031W WO 2023276844 A1 WO2023276844 A1 WO 2023276844A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- male
- hot water
- hook
- loop fastener
- engaging element
- Prior art date
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
- A44B18/00—Fasteners of the touch-and-close type; Making such fasteners
- A44B18/0046—Fasteners made integrally of plastics
- A44B18/0061—Male or hook elements
-
- 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
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—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 an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
Definitions
- the present invention relates to a male hook-and-loop fastener that has male engaging elements on its surface and dissolves in warm water, and a method for manufacturing the same. More specifically, hot-water soluble male hook-and-loop fasteners that do not dissolve in room temperature water but dissolve quickly in hot water at a higher temperature to lose their engaging force and lose their shape and existence. It relates to the manufacturing method thereof.
- a male hook-and-loop fastener having a hook-shaped or mushroom-shaped male engaging element is attached to either the surface of the object or the object.
- a loop hook-and-loop fastener having a loop-type engaging element on one surface and overlapping the engaging element surfaces of both hook-and-loop fasteners to engage both of the engaging elements, the object is attached to the surface of the object. It can be attached and detached any number of times by repeating engagement and peeling, and if the mounting position is not correct, it can be peeled off and the position can be easily adjusted. It is valued as a tool.
- hook-and-loop fasteners consist of a combination of a male hook-and-loop fastener and a loop hook-and-loop fastener as described above.
- the other male hook-and-loop fastener must have a hook-shaped engaging element on the surface that retains the hook-shaped shape against tensile force.
- Several proposals have been made for cold water-soluble male hook-and-loop fasteners having such hook-shaped engaging elements.
- Patent Document 1 describes a water-soluble resin obtained by grafting polyoxyalkylene to a copolymer of vinyl alcohol and allyl alcohol as a normal-temperature water-soluble male hook-and-loop fastener that can be suitably used for disposable products that can be disposed of in toilets and the like. It is described to use
- low-temperature water-soluble hook-and-loop fasteners that are soluble in tap water can easily be worn while being worn by coming into contact with body fluids with a higher temperature than that. Since it dissolves, it dissolves and loses its engaging force while being put on before it is thrown away in the toilet, and in reality it cannot be used. For this reason, sanitary products and disposable diapers using water-soluble hook-and-loop fasteners have not yet been industrialized.
- the hook-and-loop fasteners used in such disposable products are difficult to pulverize and separate while attached to disposable products.
- the presence of male hook-and-loop fasteners hinders recovery and reuse of water-absorbent resins and films. If the hook-and-loop fastener used can be easily removed from the raw material in the process of collecting, pulverizing, separating, washing, sterilizing, etc., the pulp, fiber, superabsorbent resin, and film can be collected. It becomes extremely easy to reuse.
- the present invention provides a male hook-and-loop fastener for use in such disposable products, which does not dissolve in water having a temperature similar to that of bodily fluids discharged from the human body.
- a male hook-and-loop fastener for use in such disposable products, which does not dissolve in water having a temperature similar to that of bodily fluids discharged from the human body.
- it is a hot water soluble male hook-and-loop fastener that provides a high engagement force (hereinafter also referred to as engagement strength). More preferably, it has hot water solubility and a high engagement force, and the male engagement element is flexible, and the resin used for molding is suppressed from gelling or decomposing during molding.
- the hot water soluble male hook-and-loop fastener (hereinafter sometimes referred to as the male molded hook-and-loop fastener) with little breakage in the male engaging elements of the molded hook-and-loop fastener and cracks in the base layer of the hook-and-loop fastener ) is intended to provide Further preferably, such a male molded hook-and-loop fastener that is soluble in hot water, has high engagement strength, and is excellent in moldability, is a small male mold that is excellent in touch when worn. It is an object of the present invention to provide an engaging element.
- the present invention provides a male hook-and-loop fastener having a base and a plurality of male engaging elements projecting from the surface of the base, wherein both the base and the male engaging elements contain a polyvinyl alcohol resin. and the base body and the male engaging element are both soluble in hot water at a water temperature within a water temperature range of 45 to 90°C, but are not soluble in water below 45°C. is a male hook-and-loop fastener.
- a plurality of the male engaging elements are arranged in a row, and the male engaging elements rise from the base surface and or the male engaging element rises from the base surface and is divided into the front and rear in the column direction along the way.
- the tip portion is bent in a direction and has a shape facing a direction approaching the surface of the substrate, and the substrate and the male engaging element both have a degree of polymerization of 300 to 700. in the range of 80 to 99 mol% in saponification degree, and the base and the male engaging element are composed of the polyvinyl alcohol resin, polyhydric alcohol or ethylene oxide.
- the polyvinyl alcohol-based resin is added to 100 parts by mass of the polyvinyl alcohol-based resin, and further, the polyvinyl alcohol-based resin contains layered inorganic particles, This is the case where the resin composition is added in an amount of 4 to 25 parts by mass with respect to 100 parts by mass.
- the male engaging element rises from the surface of the base, bends in the row direction from the middle, and has a tip end in a direction approaching the surface of the base.
- the male engaging element has a facing shape
- the height from the base surface of the male engaging element to the top of the male engaging element is 1.2 mm or less, and the male engaging element
- the male engagement part is formed.
- the height from the base surface of the element to the top of the male engaging element is 0.6 mm or less.
- the polyhydric alcohol or ethylene oxide polymer is polyethylene glycol, and its number average molecular weight is in the range of 300 to 700. This is the case where the layered inorganic particles are talc.
- the present invention provides a hot water soluble male hook-and-loop fastener and a loop fiber made of a polyvinyl alcohol resin that dissolves in hot water at a water temperature of 45 to 90°C but does not dissolve in water at a temperature of less than 45°C.
- the hot water-soluble loop surface fastener has a nonwoven fabric or a woven or knitted fabric as a base fabric, and loop fibers are present on the surface thereof.
- the present invention further provides a male engagement device in which a melt of a resin composition satisfying the following (1) and (2) is poured onto the surface of a metal roll satisfying the following (A), and holes are bored in the surface of the metal roll.
- the hot water soluble male hook-and-loop fastener is produced by pressing the molten material into an element-shaped cavity, cooling and solidifying the molten material in this state, peeling the molten material from the surface of the metal roll, and pulling the metal roll out of the cavity.
- the metal roll is a stack of ring-shaped molds in which a plurality of the cavities are carved on the outer circumference, and a plurality of the cavities are formed on the surface of the metal roll.
- the cavities are arranged in rows in the circumferential direction, and the cavities are bent halfway in the row direction of the cavities, and the tip ends thereof approach the surface of the metal roll, or are bifurcated in the middle and respectively in the row direction.
- (1) Made of a resin composition containing a polyvinyl alcohol-based resin, a polyhydric alcohol or an ethylene oxide-based polymer, and layered inorganic particles, the resin composition The mixing ratio of the polyhydric alcohol or the ethylene oxide polymer is in the range of 5 to 45 parts by mass and the layered inorganic particles is in the range of 4 to 25 parts by mass with respect to 100 parts by mass of the polyvinyl alcohol resin.
- the polyvinyl alcohol has a degree of polymerization of 300 to 700 and a degree of saponification of 80 to 99 mol%.
- the cavities are bent in the row direction of the cavities in the middle and have a shape in which the leading end of the cavities is close to the surface of the metal roll.
- the depth of the cavity from the surface of the metal roll is 1.2 mm or less at the deepest point, or the cavity is divided into two parts in the middle and each bends in the direction of the row, and the tip thereof is the surface of the metal roll.
- the depth of the cavity from the surface of the metal roll is 0.6 mm or less at the deepest point.
- the present invention also provides a disposable diaper or a sanitary product to which the hot water-soluble male hook-and-loop fastener is attached.
- the hot-water water-soluble male hook-and-loop fastener of the present invention (hereinafter sometimes referred to as a male hook-and-loop fastener) has a water dissolution temperature of 45 to 90°C, and does not dissolve in water below 45°C. Since conventional known water-soluble hook-and-loop fasteners are intended to be dissolved by flushing them down the toilet after use, it is important that the water dissolution temperature is 10 to 25°C, which is equivalent to that of tap water. Then, the water dissolution temperature of the hot water soluble hook-and-loop fastener of the present invention is much higher, which is far from the temperature at which it can be dissolved by flushing it down the toilet.
- the hot water-soluble male surface fastener of the present invention can be dissolved in water at a temperature of less than 45°C. practically insoluble in
- substantially insoluble means that, when immersed in water, even if the surface layer dissolves, the inside does not dissolve, and the function as a hook-and-loop fastener is not lost, or that the function as a hook-and-loop fastener is not lost even if the surface layer is immersed in water. It means that it is hardly dissolved.
- Polyvinyl alcohol-based resins are exemplified as resins constituting such hot water soluble male hook-and-loop fasteners in terms of engagement strength and hot water solubility.
- polyvinyl alcohol is a special resin that, when made into fibers, gives much higher strength than ordinary fibers, and is also soluble in water.
- the male hook-and-loop fastener of the present invention contains polyvinyl alcohol resin, which is such a special resin, thereby obtaining a male hook-and-loop fastener having both high engaging strength and hot water solubility.
- the male hook-and-loop fastener having both high engaging strength and hot water solubility is preferably manufactured by injection molding.
- a polyvinyl alcohol resin having a degree of polymerization and a degree of saponification can be mentioned, and a resin composition containing three substances: a polyvinyl alcohol resin, a polyhydric alcohol or an ethylene oxide polymer, and layered inorganic particles, And a resin composition in which these are mixed in a specific amount ratio is preferable, and by using such a special resin composition, it has a high engagement strength and a temperature range of 45 to 90 ° C. , but does not dissolve in water below 45°C.
- the surface of the metal roll as described above contains the above-described special resin composition, that is, polyvinyl alcohol-based resin, polyhydric alcohol or ethylene oxide-based polymer, and layered inorganic particles.
- a melt of a resin composition is flowed, and the melt is press-fitted into cavities having the shape of male engaging elements perforated in rows on the surface of the metal roll, and the melt is cooled and solidified in this state, It is preferably obtained by using a method of peeling off from the surface of the metal roll and pulling out of the cavity.
- the male engaging elements rise from the surface of the base, bend in the direction of the row in the middle, and have their tips directed toward the surface of the base (hereinafter, this shape will be referred to as (sometimes referred to as an inverted J-shape), or the male engaging element rises from the surface of the base, splits in the front and rear in the row direction on the way and bends in the row direction, and the split tip ends on the surface of the base. It has a plurality of male engaging elements having a shape facing in a direction approaching (hereinafter, this shape may be referred to as a Y shape).
- Such male engaging elements are bent in the same direction, and since they work together to resist pulling in the row direction of the male engaging elements from the engaging partner, the male engaging elements are hard to break.
- a high engaging force can be obtained more easily than in the case where the head portion (engaging swollen portion) extends in the direction intersecting with the row of male engaging elements or in the case where the distal end portion of the stem spreads like an umbrella.
- the height of the male engaging element is low. In such a case, even if the male engaging element is attached to a part that easily comes into contact with the skin, such as a sanitary product or a disposable diaper, the feeling of a foreign object is suppressed.
- the male engaging elements have an engaging swollen head represented by a mushroom shape, it is preferable in that the male engaging elements can be engaged with each other by using a unified material.
- the polyvinyl alcohol resin, polyhydric alcohol or ethylene oxide polymer, and layered inorganic particles which may constitute the hot water soluble male molded hook-and-loop fastener of the present invention, are all used in large quantities for use in contact with human skin. Since it is used, the hot water soluble male hook-and-loop fastener of the present invention has little effect on the human body.
- Fig. 1 is a perspective view of an example of a hot water-soluble male hook-and-loop fastener of the present invention
- Fig. 2 is a perspective view of another example of the hot water-soluble male hook-and-loop fastener of the present invention
- 1 is a drawing-substituting photograph showing the surface of an example of the hot-water-soluble male hook-and-loop fastener of the present invention.
- the hot water soluble male hook-and-loop fastener of the present invention has a water dissolution temperature in the range of 45 to 90° C., as described above. If the water dissolution temperature is lower than 45°C, especially lower than 40°C, the engaging force will be lost due to body fluids or the like during wearing. If the temperature exceeds 90° C., it may not be dissolved during the recovery and recycling steps. It is preferably within the range of 50 to 85°C, more preferably within the range of 52 to 82°C.
- the water dissolution temperature is a temperature measured by the following method.
- PVA resins As a resin constituting a male hook-and-loop fastener that satisfies such a water dissolution temperature in the range of 45 to 90° C., in terms of water solubility, strength and moldability, and in terms of obtaining even higher engagement strength, Polyvinyl alcohol (hereinafter abbreviated as PVA) resins can be mentioned.
- a male hook-and-loop fastener that satisfies such a water dissolution temperature has hook-like engaging elements made of thick PVA-based water-soluble monofilament threads on the surface of a woven or knitted fabric made of PVA-based water-soluble fibers.
- a so-called woven or knitted male hook-and-loop fastener is conceivable, and in such a woven or knitted male hook-and-loop fastener, fibers having both water solubility and weaving properties include PVA-based fibers.
- a male hook-and-loop fastener that dissolves in water at room temperature there is described a male hook-and-loop fastener formed by cutting a loop projecting from a base fabric made of a woven or knitted fabric.
- the monofilament yarn made of water-soluble PVA resin is inferior in heat-setting property, and as a result, the hook shape is easily stretched and the engagement is released by light engagement. , it becomes difficult to obtain a sufficient engaging force.
- a thick PVA-based monofilament yarn with high heat-setting property is used to prevent this, the resulting hook-and-loop fastener tends to be rigid and difficult to melt. In other words, it is difficult to obtain a material having hot water solubility, high engaging force, and excellent texture.
- the hook-like engaging element made of such a stiff and thick monofilament thread tends to have a poor feel to the touch. Therefore, as the hot water soluble male surface fastener of the present invention, the male molded surface fastener obtained by injection molding or the like is preferable to the woven or knitted male surface fastener in the above-described respect.
- PVA having a specific degree of polymerization and degree of saponification in terms of strength, moldability and hot water solubility is used.
- a resin composition obtained by adding a polyhydric alcohol or an ethylene oxide polymer to a PVA-based resin having such a specific degree of polymerization and saponification, or a resin composition having such a specific degree of polymerization and saponification A resin composition in which layered inorganic particles are added to a PVA-based resin having a degree of hardness is preferable.
- the PVA-based resin is also described in the above-mentioned Patent Document 1, and in the same patent document, as a PVA-based resin, a water-soluble A flexible resin is described.
- a PVA-based resin a water-soluble A flexible resin is described.
- Hook-and-loop fasteners are not fully satisfactory in moldability, engaging force, hardness of molded products, surface tackiness, and the like.
- the water-soluble resin described in Patent Document 1 dissolves in water at room temperature, and does not dissolve in hot water of 45 to 90° C., which is the object of the present invention.
- the PVA-based resin used has a degree of polymerization (the degree of polymerization in the present invention means the viscosity-average degree of is preferably in the range of 300-700.
- the degree of polymerization of the PVA-based resin used for fibers generally have a degree of polymerization of 1000 or more, for example, a degree of polymerization of 1200 to 1800, the degree of polymerization of the PVA-based resin used in the present invention is considered to be extremely low.
- the resin for molding the hook-and-loop fastener it is preferable to use a PVA-based resin with a high degree of polymerization from the viewpoint of strong engagement, and a PVA-based resin with a low degree of polymerization is preferable from the viewpoint of moldability.
- the breaking strength of the resulting male molded hook-and-loop fastener is improved, and conversely, when the degree of polymerization is 700 or less, the melt viscosity does not become too high and moldability is good. , gelation is unlikely to occur, and the molten resin can reach the tip of the cavity. As a result, it becomes easier to obtain a male molded hook-and-loop fastener having male engaging elements extending to the tip. In particular, when the male engaging element has a fine shape, the moldability is greatly affected.
- the degree of polymerization is particularly preferably in the range of 330-600, more preferably in the range of 340-550.
- the PVA-based resin to be used may be a mixture of two or more PVA-based resins having different degrees of polymerization so that the average degree of polymerization is 300-700. However, since it is difficult to uniformly knead PVA-based resins with polymerization degrees that are too far apart, it is preferable to mix PVA-based resins with similar degrees of polymerization when mixing two or more types.
- the degree of saponification of the PVA-based resin also affects the engagement strength, hot water solubility, and moldability of the male hook-and-loop fastener.
- the degree of saponification of the PVA-based resin is preferably in the range of 80 to 99 mol %.
- the degree of saponification is 80 mol % or more, the water dissolution temperature is high, and a product having a water dissolution temperature in the range of 45 to 90° C. can be easily obtained.
- the degree of saponification is 99 mol % or less, the water dissolution temperature hardly exceeds 90° C., making it suitable for an economical pulp recycling process, allowing rapid dissolution, and increasing moldability. never decrease.
- the degree of saponification is 90-98.5 mol %, most preferably 93-97 mol %.
- the PVA-based resin used in the present invention may be a mixture of two or more PVA-based resins having different degrees of saponification so that the average degree of saponification is 80 to 99 mol %.
- the degree of saponification is a value obtained by measuring according to JIS K6726:1994.
- PVA-based resin when the degree of saponification increases, gelation generally tends to occur, and when used for injection molding, the molten resin cannot reach the end of the cavity, and the male mold having the male mold engaging element extending to the tip is used. It becomes difficult to obtain molded hook-and-loop fasteners. In particular, when the male engaging element has a fine shape, the effect of gelation becomes large. In order to prevent this, when using a PVA-based resin with a high degree of saponification, one with a low degree of polymerization should be selected. It is preferable to add a polyhydric alcohol, an ethylene oxide polymer, or a layered inorganic particle, which will be described later, to the PVA-based resin, and to increase the amount of addition.
- PVA-based resin there are no particular restrictions on the method for producing such a PVA-based resin, but it is generally produced by hydrolysis or alcoholysis of polyvinyl acetate. be. Of course, other vinyl monomers, such as vinyl formate, vinyl acetate, vinyl propionate, vinyl versatic acid, vinyl pivalate, etc., and other ⁇ , are used as long as the water solubility and moldability of the PVA-based resin are not greatly impaired. - A small amount of olefin or the like may be copolymerized, and a terminal-modified polymer may also be used. Methods of polymerizing polyvinyl acetate include solution polymerization, bulk polymerization, pearl polymerization, emulsion polymerization, and the like. In addition, in order to raise the water solubility temperature of the obtained male molded surface fastener, a method of intermolecular cross-linking of the PVA-based resin existing on the surface of the molded article may be used.
- polyhydric alcohols or ethylene oxide polymers used as suitable additive raw materials for forming the water-soluble male molded hook-and-loop fastener of the present invention (forming the base and male engaging elements) will be described.
- a polyhydric alcohol or an ethylene oxide polymer acts as a plasticizer when molding a PVA resin.
- the melting temperature and thermal decomposition temperature of PVA-based resin are close to each other, and as a result, when PVA-based resin is melt-molded, thermal decomposition occurs during molding, making it impossible to mold. Molding becomes possible by adding it to the PVA-based resin.
- the polyhydric alcohol used is an aliphatic alcohol having a valence of 3 or more, and specific examples thereof include glycerin, pentaerythritol, sorbitol, etc., and alkylene oxides such as ethylene oxide and propylene oxide are added to the alcohol groups. good too. Among them, a substance obtained by adding 2 to 10 mol of ethylene oxide to glycerin and sorbitol is preferable because it has a high plasticizing effect on the PVA-based resin.
- polyethylene glycol which is particularly difficult to bleed out and is less likely to evaporate during the formation of the male molded hook-and-loop fastener.
- polyethylene glycol is particularly preferred, and polyethylene glycol which is a low polymer having a number average molecular weight of 300 to 700 is most preferred.
- polyethylene glycol with such a low number-average molecular weight, the moldability of PVA-based resin (resin composition containing PVA-based resin and polyethylene glycol) is further enhanced, and the resulting male molded hook-and-loop fastener is flexible. and In particular, when the number average molecular weight is 300 or more, the polyethylene glycol hardly bleeds out on the surface of the resulting male molded hook-and-loop fastener, and the surface becomes less sticky. Polyethylene glycol with a number average molecular weight in the range of 350-500 is more preferred, and polyethylene glycol with a number average molecular weight in the range of 370-450 is particularly preferred.
- the polyethylene glycol may be copolymerized with a small amount of alkylene oxide such as propylene oxide.
- the number average molecular weight of polyethylene glycols in the present invention is a value measured as follows. 1 g of a polyethylene glycol sample to be measured (weighed to the order of 0.1 mg) was placed in 25 mL of anhydrous phthalpyridine solution accurately weighed in a flask with a common stopper, stoppered, and heated in a boiling water bath for 2 hours. , let stand until room temperature. Then, 50 mL of 0.5 mol/L sodium hydroxide aqueous solution (precisely weighed) and 10 drops of phenolphthalein solution for titration are added to the flask.
- the liquid in this flask is titrated with a 0.5 mol/L sodium hydroxide aqueous solution, and the end point is the point at which the liquid remains red for 15 seconds.
- the titer M (mL) of the main test thus obtained and the titer R (mL) obtained by the blank test performed in the same manner as above except that the polyethylene glycol sample was not used, the number average molecular weight ⁇ (amount (g) of polyethylene glycol sample collected) x 4000 ⁇ / ⁇ (MR) x 0.5 (mol/L) ⁇ .
- the addition amount of such polyhydric alcohol or ethylene oxide polymer (these compounds are sometimes referred to as polyethylene glycols) is in the range of 5 to 45 parts by mass with respect to 100 parts by mass of PVA resin. is preferred. If it is less than 5 parts by mass, the effect of addition of polyethylene glycols, i.e., improvement of moldability and flexibility of molded products cannot be obtained. Then, the polyethylene glycol bleeds out, making the surface sticky, and further, the male engaging elements of the resulting male molded hook-and-loop fastener do not have sufficient breaking strength. It is more preferably in the range of 10 to 40 parts by mass, particularly preferably in the range of 12 to 38 parts by mass.
- layered inorganic particles are added to the raw material (resin composition) constituting the water-soluble male molded surface fastener of the present invention. That is, layered inorganic particles are preferably added to the raw material (resin composition) constituting the base and the male engaging element.
- the layered inorganic particles reduce the tackiness of the surface of the resulting male molded hook-and-loop fastener, and since the layers are arranged parallel to the flow direction of the resin during molding, the flowability of the melt is improved despite the addition of solids.
- the resulting molded product water-soluble male molded hook-and-loop fastener
- the male engagement element is formed by press-fitting the molten resin into the male engaging element-shaped cavities bored in the surface of the metal roll, cooling and solidifying the molten resin in this state, and then peeling off the male engagement element from the surface of the metal roll.
- the layer surfaces of the layered inorganic particles added to the resin melt are arranged in parallel with the flow direction of the resin melt.
- the male engaging element can be prevented from being broken, torn off or cracked in the middle of the cavity, and the male engaging element of the obtained male hook-and-loop fastener is engaged with the loop-like engaging element and peeled off. It is also possible to prevent the male engaging element from breaking or being torn off.
- the layer surfaces of the layered inorganic particles are arranged parallel to the surface of the molding (hot water soluble male hook-and-loop fastener), it is easy to prevent polyethylene glycols from bleeding out from the interior of the molding to the surface of the molding.
- the inorganic particles have a needle-like or granular shape, it is difficult to prevent the layered inorganic particles from bleeding out.
- layered inorganic particles include kaolin, halloysite, talc, pyrophyllite, smectite, vermiculite, and mica, with talc being preferred.
- Talc is a pulverized product of hydrated magnesium silicate, which enhances the moldability when molding the male molded surface fastener, increases the strength of the resulting male molded surface fastener, and enhances the strength of the resulting male molded surface fastener. has the effect of making the surface of the non-sticky.
- the male molded hook-and-loop fastener of the present invention is preferably produced by pulling out the male engaging element from the cavity of the mold.
- the average particle size of such layered inorganic particles is preferably in the range of 0.1 to 100 ⁇ m, more preferably in the range of 1 to 20 ⁇ m.
- the “average particle size” referred to here refers to the 50% particle size (D50), and a particle size distribution measuring device (manufactured by Nikkiso Co., Ltd., Nanotrac (registered trademark) particle size distribution measuring device UPA- EX150) or the like.
- the amount of such layered inorganic particles to be added is preferably 4 to 25 parts by mass with respect to 100 parts by mass of the PVA-based resin. If the amount added is less than 4 parts by mass, the effect of adding the layered inorganic particles as described above cannot be sufficiently obtained. will be lost. Preferably, it is in the range of 5 to 20 parts by mass, and is in the range of 1/3 to 2/3 of the amount of the polyethylene glycol added, particularly preferably in the range of 7 to 15 parts by mass. , and within the range of 2/5 to 3/5 of the amount of polyethylene glycol added.
- the male hook-and-loop fastener of the present invention is preferably molded from a resin composition containing a PVA-based resin, polyethylene glycols, and layered inorganic particles as described above.
- Other substances may be added as long as they do not impair the effects of the present invention, such as the strength and water solubility of the male molded hook-and-loop fastener.
- coloring agents such as pigments and dyes, it is possible to easily visually observe the dissolution of the hook-and-loop fastener in water.
- reinforcing fillers, deodorizing agents, antifungal agents, antibacterial agents, etc. can be added.
- the total amount of the PVA-based resin, polyethylene glycols and layered inorganic particles in the material constituting the male molded hook-and-loop fastener is preferably 80% by mass or more, more preferably 90% by mass or more, and still more preferably 95% by mass or more. 100% by mass.
- the male engaging elements are arranged in rows from the viewpoint of obtaining a high engaging force. or the male engaging element rises from the surface of the base, divides into front and rear in the direction of the row and bends in the direction of the row along the way. It is preferable that the divided tip portion has a shape facing a direction approaching the surface of the substrate.
- the above-mentioned “half way” refers to the distance from the portion of the male engaging element where the male engaging element is in contact with the base surface to the tip of the male engaging element.
- a method for molding a male molded surface fastener from such a hot water soluble resin composition containing a PVA resin will be described.
- a metal roll having a plurality of male engaging element-shaped cavities on its surface is coated with A sheet having a plurality of male engaging elements on its surface is manufactured by pouring a melted resin composition into a sheet and press-fitting the melted material into a cavity. method is used.
- a melt of a resin composition satisfying the following (1) and (2) is poured onto the surface of a metal roll satisfying the following (A):
- the molten material is cooled and solidified, and then separated from the metal roll surface and pulled out from the cavity.
- a method for manufacturing a hot water soluble male hook-and-loop fastener is a stack of ring-shaped molds having the cavities carved on the outer circumference, and the cavities are arranged in rows in the circumferential direction of the metal roll on the surface of the metal roll.
- the cavities are bent halfway in the row direction of the cavities and the tip ends thereof are close to the surface of the metal roll, or they are divided into two parts in the middle and bent in the row direction, and the tip ends thereof are bent in the row direction. the portion is close to the metal roll surface;
- the polyhydric alcohol or ethylene oxide polymer is in the range of 5 to 45 parts by mass, and the layered inorganic particles are in the range of 4 to 25 parts by mass.
- the polyvinyl alcohol resin has a degree of polymerization of 300 to 700 and a degree of saponification. in the range of 80 to 99 mol%
- a ring with a thickness of 0.2 to 0.5 mm is cut on the outer circumference in the shape of a male engaging element such as an inverted J-shape or Y-shape.
- a mold roll having a plurality of cavities having male engaging element-shaped cuts on its outer peripheral surface is prepared by successively stacking a shaped mold and a metal ring that is not cut into such cuts. .
- a male engaging element that can be engaged in one direction such as an inverted J shape
- cuts in an inverted J shape that are curved in the opposite direction to the above-described inverted J shape are made. It is preferable to replace half of the ring-shaped mold having the reverse J-shaped cut with a ring-shaped mold having a thickness of 0.2 to 0.5 mm carved on the outer circumference.
- an inverted J-shaped ring-shaped mold bent in the opposite direction and an inverted J-shaped ring-shaped mold bent in the positive direction may be alternately present, or two or more. may alternately exist in units of a plurality of sheets.
- a plurality of cavities curved in the circumferential direction of the roll are arranged in rows in the circumferential direction on the surface thereof, and such rows are arranged in parallel in the width direction of the metal roll.
- the bending direction of the cavity is reversed for each row or for each row.
- the cavity is tapered from the surface of the metal roll to the tip, and ), it gradually bends in the circumferential direction of the metal roll, and the tip faces toward the metal roll surface.
- the gap between the metal roll and another drum roll present at a position facing each other is By extruding and compressing the melt, the cavity is press-filled with the melt and a sheet having a uniform thickness is formed on the roll surface, and the mold roll is constantly circulating inside the roll while it is rotating.
- the molten material in the cavity is cooled and solidified by the cooling medium, and the base of the male molded hook-and-loop fastener obtained is stretched by nip rollers whose gap is adjusted so as to have a uniform thickness. Withdraw the male engagement element from the cavity while peeling it away from the surface.
- a sheet-like article having a plurality of male engaging elements on its surface that is, a male molded hook-and-loop fastener is obtained.
- the hot water soluble male molded surface fastener of the present invention obtained by such a method has a plurality of male engaging elements arranged in a row, each engaging element rising from the base surface and A shape in which each engaging element bends in the column direction from the starting point and the tip thereof faces the direction to approach the base surface (inverted J shape), or each engaging element rises from the base surface and divides into front and back in the column direction on the way.
- Each of the divided ends has a shape (Y-shape) directed toward the substrate surface.
- the male engaging element may rise directly from the base surface, or may rise from a ridge-like bulging portion formed on the substrate surface.
- the height of the ridge-like swelling portion is preferably in the range of 1/20 to 1/3 of the thickness of the substrate from the surface of the substrate.
- the diameter of the ring-shaped mold with the cavity is made slightly smaller than the adjacent ring-shaped mold without the cavity, or A method of shifting the center of a ring-shaped mold with a cavity from the center of an adjacent ring-shaped mold can be used. It should be noted that it is not necessary for all the male-type engaging elements to rise from the ridge-like bulging portion, and a certain effect can be obtained even if they are only a part.
- a plurality of male engaging elements (1) are arranged in a row, and each engaging element rises from the surface of a base (2) and extends in the row direction (T ), and the tip portion has a shape (inverted J-shape) directed toward the surface of the base body, and the male molded surface fastener shown in FIG.
- Coupling elements (1) are arranged in a row, and each engaging element rises from the surface of the base (2), divides into front and rear in the row direction (T) on the way, bends in the row direction, and splits at each tip. is the case of having a shape (Y-shaped shape) directed toward the substrate surface.
- the male engaging element has a shape (inverted J shape) in which the male engaging element rises from the surface of the base, bends in the row direction from the middle, and the tip portion faces toward the surface of the base.
- the height from the base surface of the male engaging element to the top of the male engaging element is preferably 1.2 mm or less.
- the male engaging element is formed from the base surface.
- the height to the top of the male engaging element is 0.6 mm or less.
- the height of the male engaging element of a male molded hook-and-loop fastener is often 1.5 mm or more, and usually has a height of about 2 to 3 mm.
- the male engaging element when the height of the male engaging element is low in this way, the male engaging element is flexible, and even if it is attached to a part such as sanitary napkins that easily comes into contact with the skin, it does not feel like a foreign object. In addition, it is possible to reduce the time required for dissolution, while preventing the skin from becoming rough even when it comes in contact with the skin.
- the lower limit of the height of the male engaging element is not particularly limited, but may be, for example, 0.1 mm or more, 0.2 mm or 0.4 mm. When the male engaging element has an inverted J shape, the lower limit of the height of the male engaging element may be, for example, 0.4 mm, 0.6 mm, or 0.8 mm.
- the length of the male engaging element from the top to the tip (the bent portion) is preferably 0.15 to 0.55 mm.
- the width of the male engaging element is preferably 0.15 to 0.3 mm from the viewpoint of water solubility.
- the cavities are obtained by using one that is not deeply carved from the surface of the metal roll.
- the metal roll of the cavity The depth from the surface is 1.2 mm or less at the deepest point, and the male engaging element is divided into the front and rear in the row direction on the way and each bends in the row direction.
- the depth of the cavity from the metal roll surface at the deepest point should be 0.6 mm or less. It is easily obtained by using
- the thickness of the base layer is preferably in the range of 0.15 to 0.3 mm from the viewpoint of rapid hot water solubility and breaking strength of the hook-and-loop fastener.
- the element density of the male engaging elements is preferably 60 to 160/cm 2 .
- the hot water-soluble male hook-and-loop fastener of the present invention is obtained by laminating a similar hot-water-soluble male hook-and-loop fastener on the back surface by thermocompression bonding, or by using a hot-water soluble adhesive or a hot-water soluble pressure-sensitive adhesive.
- It may be a double-sided hook-and-loop fastener having male engaging elements on both the front and back sides, or it may have a cavity on the surface of the metal roll on the back side so that the male engaging elements are also present on the back side during molding. may be used to have male engaging elements on the back surface as well, so that a double-sided hook-and-loop fastener having male engaging elements on both the front and back surfaces may be used.
- a loop material (hook-and-loop fastener having a loop engaging element) made of a hot water soluble woven or knitted fabric having a loop fiber on the surface or a non-woven fabric is similarly integrated on the back side, and the male engaging element is on the surface and the male type engaging element is on the back side. It can also be a hot water soluble double-sided fastener with looped engaging elements.
- the male hook-and-loop fastener and the loop material do not necessarily have to be integrated back-to-back with each substrate sandwiched therebetween. Other mating methods may be used as long as they are joined so that the is on the back side, and the joining is such that the fiber loops are located away from the back side where the male engaging elements are located. can be
- the hot water-soluble male hook-and-loop fastener of the present invention quickly dissolves and loses its engaging ability when it comes into contact with warm water of 45 to 90°C, and the male hook-and-loop fastener itself completely dissolves and disappears.
- Any loop fastener to be engaged with can be used as long as it is not soluble at low temperature such as normal temperature water. Therefore, the hook-and-loop fastener of the engaging partner does not need to be soluble in hot water, but by making the hook-and-loop fastener also soluble in hot water, the presence of all the hook-and-loop fasteners can be eliminated during collection and reuse. It can also be eliminated by dissolution.
- the loop surface fastener to be engaged is also melted by contact with hot water of 45 to 90 ° C like the hot water soluble male surface fastener, by combining these surface fasteners, it is possible to engage with hot water. It is preferable in terms of increasing the reliability of loss of ability, and in terms of almost complete dissolution at the same time as the hot water soluble male hook-and-loop fastener.
- the hot water soluble loop surface fastener used as such an engaging partner is preferably made of fibers that are soluble in hot water at or near the same temperature as the male surface fastener.
- a PVA-based resin is preferable because it has excellent tensile strength and is excellent in handleability.
- a spinning dope obtained by dissolving a PVA-based resin having a degree of saponification of 88 to 98 mol% and a degree of polymerization of 1500 to 2000 in dimethyl sulfoxide, which is sold by Kuraray Co., Ltd., is subjected to dry-wet or wet spinning in a methanol bath.
- Hot water soluble PVA fibers (Kuraron K-II (registered trademark) WN-4 to 8, WQ-9) obtained by Hot water soluble PVA fiber obtained by blending polyethylene glycol or ethylene oxide adduct of sorbitol and melt spinning, or spinning stock solution obtained by dissolving PVA-based resin with saponification degree of 88 to 98 mol% in water in a saturated sodium sulfate solution bath. Hot-water-soluble PVA-based fibers obtained by wet-spinning are included.
- Such a loop hook-and-loop fastener made of hot water-soluble PVA-based fibers has loops (engaging elements) made of the same hot water-soluble fibers on the surface of a nonwoven fabric or woven or knitted material made of such hot water-soluble fibers. things are mentioned. Specifically, in the case of a nonwoven fabric, the hot water soluble fibers are formed into a web, entangled by needle punching or the like, and if necessary, the surface is raised to form loops ( Non-woven fabric in which engaging elements) are present.
- the hot water soluble fiber is used as spun yarn, and the spun yarn is used as warp and weft to produce a woven fabric.
- a knitted fabric is produced using a fabric-based loop hook-and-loop fastener protruded on the surface of the fabric and a spun yarn composed of such hot water soluble fibers, and the surface of the knitted fabric is raised with a card cloth or the like to add the hot water soluble fibers to the fabric surface.
- a knitted loop hook-and-loop fastener in which loops consisting of are present.
- a multifilament yarn is used as the hot water soluble fiber, and the multifilament yarn is used as the warp and weft to produce a woven fabric.
- the multifilament yarn which is such a hot water soluble fiber, may be made into a non-woven fabric by a spunbond method, and the surface of the nonwoven fabric may be raised to protrude loops made of the hot water soluble fiber from the surface.
- the hot water soluble male hook-and-loop fastener of the present invention has a male engaging element on the front surface and a female engaging element (hereinafter referred to as a loop engaging element) on the back surface.
- a hook-and-loop fastener (hereinafter abbreviated as a hot water-soluble loop hook-and-loop fastener) may be used.
- a hot water soluble male hook-and-loop fastener and a hot water soluble loop hook-and-loop fastener are superimposed back-to-back so that the engaging elements are on the outside, and the two are bonded together in places or over the entire surface by hot-water soluble adhesive or thermocompression bonding. Examples include those that are joined together.
- the ends of the hot water soluble male molded hook-and-loop fastener having male engaging elements on the front surface are attached to the ends of the hot water soluble loop hook-and-loop fastener having loop-shaped engaging elements on the back so as not to overlap other than the ends.
- the hot water soluble loop surface Since the fastener itself is required to have sufficient tensile strength, the hot water soluble loop hook-and-loop fastener has hot water soluble fiber loops on the surface of the tricot knitted fabric made of hot water soluble fibers. It is preferable to have
- the hot water soluble male hook-and-loop fastener obtained by the present invention has sufficient engaging force and does not dissolve in normal temperature water, but dissolves rapidly in hot water at any temperature in the range of 45 to 90°C. It has the property of being harmful to the human body and does not contain anything harmful to the human body. Therefore, the hot water-soluble male hook-and-loop fastener alone or in combination with the hot water-soluble female hook-and-loop fastener can be used as a fixing material for fixing sanitary products to underwear, as a waist fixing material for disposable diapers, or for other purposes. Can be used as a fixing material for disposable items.
- the hot water soluble male surface of the present invention is used in the process of recovering pulp, fiber, super absorbent resin and film from used disposable products to which the hot water soluble male surface fastener of the present invention is attached.
- the male hook-and-loop fastener immediately dissolves and disappears in the presence of warm water, and the presence of the hook-and-loop fastener of the present invention causes the pulp, fiber, superabsorbent resin, film, etc. It does not prevent collection.
- E40000 manufactured by Kuraray Fastening Co., Ltd.
- the initial engagement force and the engagement force after 10 times of engagement and separation were measured according to JIS L3416:2000. It was measured.
- the surface of the hook-and-loop fastener was left for 4 hours at a temperature of 30° C. and a humidity of 100%.
- Example 1 As a mold, a ring-shaped mold with a thickness of 0.30 mm and a diameter of 212 mm in which a hook-shaped engaging element (inverted J-shaped engaging element) with a depth of 0.90 mm is carved on the outer circumference.
- a hook-shaped engaging element inverted J-shaped engaging element
- a ring-shaped mold with a diameter of 0.30 mm and a diameter of 212 mm, and a metal ring with a thickness of 0.30 mm and a diameter of 212 mm, which is not engraved with such a shape, are stacked in order to form an inverted J-shaped engagement on the outer peripheral surface.
- a mold roll having a width of 120 mm and having a plurality of mating element-shaped cavities and engaging element-shaped cavities facing in the opposite direction on the surface was prepared.
- the diameter of the ring-shaped mold in which the hook-type engaging element shape is carved on the outer circumference is slightly larger than the diameter of the rings adjacent to it (a ridge-top bulging portion with a height of 0.03 mm, which will be described later, is formed. as small as possible).
- PVA-based resin with a degree of polymerization of 345 and a degree of saponification of 93 mol% (vinyl acetate with a degree of polymerization of 300 and a degree of saponification of 88 mol% and 50 parts by mass of PVA resin obtained by saponifying vinyl acetate having a degree of polymerization of 390 to a degree of saponification of 98 mol%).
- a resin composition a-1 obtained by mixing 25 parts by mass of polyethylene glycol and 12 parts by mass of talc (average particle size: 4 ⁇ m) was melted at 190° C., extruded, and pressed by a mold roll and a drum roll.
- the resulting hot water soluble male molded hook-and-loop fastener has a plurality of male engaging elements arranged in a row, and each male engaging element is a ridge-like bulging portion (height: 0) formed on the surface of the substrate. 0.03 mm), bends in the column direction from the middle, and has a shape (inverted J shape) in which the tip faces the direction approaching the substrate surface (inverted J shape), the height is 0.94 mm, and the element density is high. It was 110 lines/cm 2 . The thickness of the substrate was 0.21 mm.
- Table 1 below shows the performance of the resulting hot water soluble male molded hook-and-loop fastener.
- the dissolution temperature in water is 55°C, which is much higher than the temperature at which water is dissolved at room temperature, and there is almost no problem with regard to engaging force, flexibility, or surface stickiness.
- the disposable diaper was folded into a circle, and in this state, the folded state was fixed using a hot water soluble male molded hook-and-loop fastener attached to the disposable diaper.
- the male hook-and-loop fastener immediately melted and disappeared, and the disposable diaper unfolded from the folded state, making subsequent processing easier.
- hot water soluble PVA fiber Kerron K-II (registered trademark) WN-6 thick
- Kuraray Co., Ltd. which is soluble in water at 60°C
- a nonwoven fabric of m 2 was produced and engaged using this nonwoven fabric as an engaging partner.
- the engaging force was high, slightly inferior to that of the male hook-and-loop fastener, and the engaging property was excellent.
- Examples 2-6 Five types of resin compositions a-2 to a-6 were produced in the same manner as in Example 1 except that the PVA-based resin used for molding was changed to the following PVA1 to PVA5 in Example 1 above to produce resin compositions a-2 to a-6. A hot water soluble male molded hook-and-loop fastener (hot water soluble male hook-and-loop fastener) was manufactured.
- PVA1 Example 2
- a PVA-based resin having a degree of polymerization of 330 and a degree of saponification of 91.3 mol% 67 parts by mass of a PVA-based resin obtained by saponifying vinyl acetate having a degree of polymerization of 300 to a degree of saponification of 88 mol% and polymerization Consists of 33 parts by mass of PVA-based resin obtained by saponifying vinyl acetate having a degree of 390 to a degree of saponification of 98 mol%)
- PVA2 Example 3
- a PVA-based resin having a degree of polymerization of 360 and a degree of saponification of 94.7 mol% 33 parts by mass of a PVA-based resin obtained by saponifying vinyl acetate having a degree of polymerization of 300 to a degree of saponification of 88 mol% and polymerization Composed of 67 parts by mass of PVA-based resin obtained by saponifying vinyl acetate having a degree of 390 to a degree
- Each of the obtained hot water soluble male molded hook-and-loop fasteners has a plurality of male engaging elements arranged in a row in the same manner as in Example 1, and each male engaging element A ridge-shaped bulge (height: 0.03 mm) formed on the substrate rises from the top, bends in the row direction from the middle, and has a shape (inverted J shape) in which the tip faces a direction approaching the substrate surface, The height was 0.94 mm, and the element density was 110 lines/cm 2 . The thickness of the substrate was 0.21 mm.
- the hot water soluble male molded hook-and-loop fasteners produced from PVA3 and PVA5 were conspicuous in that the male engaging elements on the surface were only halfway. In particular, those manufactured from PVA3 were quite conspicuous in that the shape of the male engaging element was imperfect.
- the resin was not filled up to the tip of the cavity during molding, but this did not significantly reduce the engagement strength.
- Table 2 shows the performance of these five types of hot water soluble male molded hook-and-loop fasteners obtained.
- the water dissolution temperature of the hot water soluble male molded surface fastener obtained from PVA1 of Example 2 is 50°C, which is much higher than the temperature at which it dissolves in room temperature water.
- the water dissolution temperature of the hot water soluble male molded surface fastener obtained from PVA2 was 62°C, and the water dissolution temperature of the hot water soluble male molded surface fastener obtained from PVA3 in Example 4 was 80°C.
- the water dissolution temperature of the hot water soluble male molded surface fastener obtained from PVA4 of Example 5 was 70°C
- the water dissolution temperature of the hot water soluble male molded surface fastener obtained from PVA5 of Example 6 was 77°C. , both have a water solubility temperature much higher than the temperature at which they dissolve in room temperature water.
- the hook-and-loop fastener was disengaged in 10 to 30 seconds, and completely completed in 2 minutes 25 seconds to 4 minutes 6 seconds. Both the hook-and-loop fastener and the nonwoven were dissolved. Moreover, none of the hook-and-loop fasteners of Examples melted at a water temperature of less than 49°C.
- Comparative Examples 1-3 In the same manner as in Example 1 above, except that the PVA-based resin used for molding was changed to one of the following PVA6 to PVA7 to produce resin compositions b-1 to b-3, A hot water soluble male molded hook-and-loop fastener was manufactured. With respect to PVA6, the strength of the male engaging element is low and it is easily broken during molding. With respect to PVA8, the melt viscosity is too high and gelation occurs in the mold, causing the melted resin to reach the tip of the cavity. As a result, both failed to produce a decent male molded hook-and-loop fastener.
- the water dissolution temperature of the defective male molded surface fastener obtained from PVA8 and the hot water soluble male molded surface fastener obtained from PVA7 was measured. was 27°C and from PVA6 was 25°C. If the water dissolution temperature is high like this male molded hook-and-loop fastener made from PVA8, a large amount of very high temperature water is required in the process of recovering the pulp from the disposable product and making it into a wet non-woven fabric again. It turns out that it cannot be adopted from the viewpoint of economy. Conversely, if the water dissolution temperature is too low like the hook-and-loop fastener from PVA7, there is concern that it will dissolve in urine when used in disposable diapers. is required, and it has been found that it is not versatile in this respect.
- Example 7 In Example 1 above, as the mold roll used for molding, a ring-shaped mold with a thickness of 0.3 mm and a depth of the cavity carved on its surface of 1.2 mm was used. Using the same resin composition a-1, a hot water soluble male molded hook-and-loop fastener was produced. The resulting water-soluble male molded hook-and-loop fastener had male engaging elements with a height of 1.26 mm at an element density of 136/cm 2 . The surface of this hook-and-loop fastener is as shown in FIG. The tip portion had a plurality of male engaging elements of a shape (inverted J-shape) directed toward the surface of the substrate, and the thickness of the substrate was 0.23 mm. The performance of the resulting hot water soluble male molded surface fastener is shown in Table 3 below.
- the resulting male molded hook-and-loop fastener had large male engaging elements and was somewhat inferior to the one of Example 1 in terms of the speed of dissolution in hot water, but both in terms of engaging force and surface stickiness. No problem. However, when it is used as a material for attachment to underwear such as disposable diapers and sanitary goods, it is inferior in terms of feel to the touch. However, when the obtained male molded hook-and-loop fastener was used as a waist fixing member of a disposable diaper, it did not dissolve in urine during wearing. After use, the disposable diaper was folded into a circle in the same manner as in Example 1, and in this state, the folded state was fixed using a hot water soluble male molded hook-and-loop fastener attached to the disposable diaper.
- Example 8 In the above Example 1, as the shape of the cavity of the mold roll used for molding, a ring-shaped mold with a thickness of 0.3 mm in which a Y-shaped notch with a depth of 0.55 mm was carved on the outer circumference was used. Using the same resin composition a-1 as in Example 1, a hot water soluble male molded surface fastener was produced. The resulting hot water soluble male molded hook-and-loop fastener has male engaging elements present on its surface arranged in rows. It is divided into front and rear portions and bent in the row direction, and each divided tip portion has a shape facing the direction approaching the substrate surface, ie, a Y shape, and its height is 0.55 mm. was 147 lines/cm 2 and the thickness of the substrate was 0.18 mm. The performance of the resulting hot water soluble male molded surface fastener is shown in Table 3 below.
- the resulting male molded hook-and-loop fastener had excellent hot-water solubility and engaging force equivalent to those of Example 1, and also had no stickiness on the surface like that of Example 1. It was excellent in terms of usability. Furthermore, even when used for applications in contact with the skin, it was gentle and superior in terms of touch, did not dissolve in urine while worn, and had no problems in use. After use, the disposable diaper was folded into a circle, and in this state, the folded state was fixed using a hot water soluble male molded hook-and-loop fastener attached to the disposable diaper.
- Example 9 Hot water solubility A male molded hook-and-loop fastener was manufactured.
- the male molded hook-and-loop fastener thus obtained had a plurality of male engaging elements arranged in rows in the same manner as in Example 1, and each male engaging element was a ridge-like bulge formed on the surface of the base.
- the device density was 110 lines/cm 2 .
- the thickness of the substrate was 0.21 mm. Table 4 below shows the performance of the resulting hot water soluble male molded surface fastener.
- Example 1 It has excellent hot water solubility and engagement force equivalent to those of Example 1, and furthermore, it does not feel sticky on the surface like Example 1, and is excellent in terms of ease of use. there were. Furthermore, even when used for applications in contact with the skin, it was gentle and superior in terms of touch, did not dissolve in urine while worn, and had no problems in use.
- Examples 10-13 Four types of hot water soluble males were prepared in the same manner as in Example 1 except that the resin composition a-1 used for molding was changed to the following resin compositions a-8 to a-11 in Example 1 above. A molded hook-and-loop fastener was manufactured.
- Example 1 Manufactured in the same manner as in Example 1, except that parts by mass and talc were changed to 5 parts by mass. Manufactured in the same manner as in Example 1 except for the change [Resin composition a-11: Example 13] Example 1 except that the talc added in Example 1 above was changed to one having an average particle size of 1.5 ⁇ m. manufactured in the same manner as
- Example 10 the fluidity of the melt of the resin composition a-8 used for molding the molded male hook-and-loop fastener was slightly low, and it is thought that the melt did not reach the tip of the cavity. A few male engaging elements were observed, and in the case of Example 11, very few male engaging elements were torn off during extraction from the cavity.
- the male molded hook-and-loop fasteners obtained in Examples 10 and 11 do not have any problems as products, and flexible hook-and-loop fasteners having hook-shaped male engaging elements faithful to the cavities are obtained. had been In contrast, Examples 12 and 13 had no molding or product problems.
- Table 5 The performance of the male molded surface fasteners of Examples 10 to 13 thus obtained are shown in Table 5 below.
- Example 10 to 13 All of the hot water soluble male hook-and-loop fasteners of Examples 10 to 13 above have excellent hot water solubility and engagement force equivalent to those of Example 1, and furthermore, the surface stickiness of Example 10 is also improved. Except for that, it did not feel the same as the one in Example 1, and was excellent in terms of ease of use.
- the sample of Example 10 had a slightly sticky surface, but it was of a level that did not pose a problem during use. Furthermore, even when used for applications in contact with the skin, the product of Example 11 was slightly inferior in flexibility, but the products of other Examples were all soft and gentle.
- Male engaging element 2 Substrate T: Row direction of male engaging elements
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Abstract
Description
もし、使用されたこれら生理用品や使い捨ておむつ等の使い捨て製品が、使用済みトイレットペーパーと同様に、トイレに流すことができるならば、各家庭での廃棄処理の労力や悪臭対策が極めて簡単となることから、さらに廃棄物を回収してそれを焼却するのに要する労力や燃料等が不要となることから、トイレに流すことができる生理用品や使い捨ておむつ等が求められており、それに伴い、このような生理用品や使い捨ておむつ等を構成する面ファスナーに関しても、トイレの水で速やかに溶解して係合力が消失してしまうような常温水溶性のものが求められている。
(A)前記金属ロールが、前記キャビティを外円周上に複数彫ったリング状金型を重ね合わせたものであり、このような金属ロールの表面に、複数の前記キャビティが前記金属ロールの円周方向に列をなして並んでおり、前記キャビティは、途中で前記キャビティの前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている、あるいは途中で二股に分かれてそれぞれ前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている
(1)ポリビニルアルコール系樹脂と、多価アルコールまたはエチレンオキサイド系重合体と、層状無機粒子を含む樹脂組成物からなり、前記樹脂組成物の混合割合が、前記ポリビニルアルコール系樹脂100質量部に対して前記多価アルコールまたは前記エチレンオキサイド系重合体が5~45質量部の範囲、前記層状無機粒子が4~25質量部の範囲である
(2)前記ポリビニルアルコールが、重合度300~700で、鹸化度80~99モル%である
そして本発明は、上記の温水溶解性雄型面ファスナーが取り付けられた使い捨ておむつまたは生理用品である。
本発明の温水溶解性雄型面ファスナーの水溶解温度は45~90℃のいずれかの温度であることから、当然のこととして、本発明の温水水溶性雄型面ファスナーは45℃未満の水には実質的に溶解しない。ここで言う実質的には溶解しないとは、水に浸漬した場合に、表層部は溶解しても、内部までは溶解せず、面ファスナーとしての機能が消失されないこと、あるいは表層部も含めて殆ど溶解されないことを意味する。
このことについて説明すると、ポリビニルアルコールという樹脂は、繊維とすると通常の繊維よりもはるかに高強力なものが得られるとともに、水にも溶解するという特殊な樹脂である。本発明の雄型面ファスナーは、このような特殊な樹脂であるポリビニルアルコール系樹脂を含み、それにより高い係合強力と温水溶解性を兼備した雄型面ファスナーを得るものである。
また、雄型係合素子がマッシュルーム型で代表される係合用膨頭部を有する場合には、素材を統一して雄型係合素子同士で係合することが可能である点で好ましい。
まず本発明の温水溶解性雄型面ファスナーは、前記したように、水溶解温度は45~90℃の範囲内の温度である。水溶解温度が45℃未満の場合、特に40℃より低い場合には、着用中に体液などにより係合力が消失することとなる。また90℃を越える場合には、回収、再利用工程時に溶解しない場合がある。好ましくは50~85℃の範囲内の場合、より好ましくは52~82℃の範囲内の場合である。
なお、水溶解温度は、以下の方法により測定される温度である。
[雄型面ファスナーの水溶解温度(℃)]
2000mlの水中でホットスターラー(アドバンテック株式会社製 SRS316HA)にて30mm×8mmΦ攪拌子を使用し約940rpmにて攪拌しながら水温を所定の温度に保温した浴を用意する。同浴中に20mm×20mm(目付:0.1~0.2g/20mm×20mm)に切断した雄型面ファスナーを投入する。雄型面ファスナーが完全溶解する時間を計測し、5分(以内)で完全溶解する温度の内、最も低い温度を水溶解温度とする。なお、最初は、5℃刻みの水温で測定して、それにより大まかな水溶解温度を探り、その結果をもとに、さらに水溶解温度近辺の水温で2℃刻みの浴を用いて測定して、そして、さらに水溶解温度近辺の水温で1℃刻みの浴を用いて測定して水溶解温度を決定する。
したがって、本発明の温水溶解性雄型面ファスナーとしては、織編物系の雄型面ファスナーよりも射出成形等により得られる雄型成形面ファスナーの方が上記した点で好ましいこととなる。
P=([η]×104/8.29)(1/0.62)
本発明に用いられるPVA系樹脂としては、鹸化度の異なる2種以上のPVA系樹脂を混合して、その平均鹸化度が80~99モル%となるようにしたものでもよい。なお、鹸化度はJIS K6726:1994に準じて測定して得られる値である。
多価アルコールまたはエチレンオキサイド系重合体はPVA系樹脂を成形する際の可塑剤として働くものである。PVA系樹脂は溶融温度と熱分解温度が近接していて、その結果、PVA系樹脂を溶融成形すると成形時に熱分解が生じて成形できないこととなるが、多価アルコールまたはエチレンオキサイド系重合体をPVA系樹脂に添加することにより成形が可能となる。
なお、上記「その途中」とは、雄型係合素子において、雄型係合素子と基体表面と接する部分から、雄型係合素子の先端までの間を指す。
本発明の温水溶解性雄型面ファスナーとして好適な温水溶解性雄型成形面ファスナーを製造する具体的な方法としては、雄型係合素子形状のキャビティを表面に複数設けた金属ロールの表面に樹脂組成物の溶融物をシート状に流すとともにキャビティ内に溶融物を圧入させ、冷却固化後に金属ロール面から剥がすと同時にキャビティからも引き抜いて、表面に雄型係合素子を複数有するシートを製造する方法が用いられる。
すなわち、本発明の温水溶解性雄型面ファスナーの製造方法は、下記(A)を満足している金属ロールの表面に下記(1)と(2)を満足する樹脂組成物の溶融物を流すとともに前記金属ロール表面に穿孔した雄型係合素子形状のキャビティ内に前記溶融物を圧入し、その状態で前記溶融物を冷却固化させた後、前記金属ロール表面から剥離するとともに前記キャビティから引き抜く温水溶解性雄型面ファスナーの製造方法。
(A)前記金属ロールが、前記キャビティを外円周上に彫ったリング状金型を重ね合わせたものであり、前記金属ロールの表面に、前記キャビティが前記金属ロールの円周方向に列をなして並んでおり、前記キャビティは、途中で前記キャビティの前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている、あるいは途中で二股に分かれてそれぞれ前記列方向に曲がり、その先端部は前記金属ロール表面に近づいていること、
(1)ポリビニルアルコール系樹脂と、多価アルコールまたはエチレンオキサイド系重合体と、層状無機粒子を含む樹脂組成物からなり、前記樹脂組成物の混合割合が、ポリビニルアルコール系樹脂100質量部に対して多価アルコールまたはエチレンオキサイド系重合体が5~45質量部の範囲、層状無機粒子が4~25質量部の範囲である
(2)前記ポリビニルアルコール系樹脂が、重合度300~700で、鹸化度80~99モル%の範囲である
このような形状を有していることにより、雄型係合素子が上からの圧力に対して倒れ難く、また係合相手のループ状係合素子からの係合素子列方向の引張力に対して複数の雄型係合素子が協同して対抗することから、高い係合力が得られる。
雄型係合素子の高さの下限値には特に制限は無いが、例えば0.1mm以上であってもよく、0.2mmであってもよく、0.4mmであってもよい。雄型係合素子が逆J字型形状である場合、雄型係合素子の高さの下限値は、例えば0.4mmであってもよく、0.6mmであってもよく、0.8mmであってもよい。
雄型係合素子の頂部から先端部までの(折れ曲がった部分)の長さは、水溶性の観点から、0.15~0.55mmであることが好ましい。
雄型係合素子の幅は、水溶性の観点から、0.15~0.3mmであることが好ましい。
また本発明の温水溶解性雄型成形面ファスナーにおいて、雄型係合素子の素子密度としては、60~160本/cm2が好ましい。
また、係合相手となるループ面ファスナーも温水溶解性雄型面ファスナーと同様に45~90℃の温水に触れることにより溶解する場合には、それら面ファスナー同士を組み合わせることで、温水に対する係合能消失の信頼性を高める点や、温水溶解性雄型面ファスナーと同時にほぼ完全溶解して存在しなくなる点で、好ましい。
具体的には、不織布の場合には、温水溶解性繊維をウェッブ化し、そしてニードルパンチ等により絡合させ、必要によりその表面を起毛することにより、その表面に同温水溶解性繊維からなるループ(係合素子)を存在させた不織布が挙げられる。
あるいは表面に雄型係合素子を有する温水溶解性雄型成形面ファスナーの端部に、裏面にループ状係合素子を有する温水溶解性ループ面ファスナーの端部を、端部以外は重ならないように、かつ雄型係合素子が存在している面が表面側、ループ状係合素子が存在している面が裏面側となるように重ね合せ、そしてこの重ね合わさった部分で両者を温水溶解性接着剤や熱圧着により接合して、雄型係合素子が表面、そして雄型係合素子が存在している場所から離れた場所の裏面にループ状係合素子が存在してように(すなわち雄型係合素子が存在している場所とループ状係合素子が存在している場所が背中合わせではなく、接合された場所を挟んでそこからそれぞれが遠ざかる方向に延びている)両者を接合したものでもよい。
また面ファスナーの表面のべとつきの有無に関しては、得られた面ファスナーを温度30℃で湿度100%の条件に4時間放置した後に、面ファスナー表面を触れて、その触感で有無を判断した。
金型として、深さ0.90mmのフック型係合素子(逆J字型係合素子)の形状を外円周上に彫った厚さ0.30mmで直径212mmのリング状金型、そのような形状を彫っていない厚さ0.30mmで直径212mmの金属製リング、上記フック型係合素子形状と逆の方向を向いているフック型係合素子形状を外円周上に彫った厚さ0.30mmで直径212mmのリング状金型、そのような形状を彫っていない厚さ0.30mmで直径212mmの金属製リングを順々に重ね合わせることにより、その外周表面に逆J字型係合素子形状のキャビティおよびその逆方向を向いている係合素子形状のキャビティを表面に複数有する幅120mmの金型ロールを用意した。なお、フック型係合素子形状を外円周上に彫ったリング状金型の径をその両隣に接するリングの径よりもわずかに(後述する高さ0.03mmの畝上膨らみ部が形成される程度に)小さくした。
上記実施例1において、成形に使用するPVA系樹脂を、次のPVA1~PVA5に変更して樹脂組成物a-2~a-6を製造する以外は実施例1と同様にして、5種類の温水溶解性雄型成形面ファスナー(温水溶解性雄型面ファスナー)を製造した。
[PVA1:実施例2]重合度330で鹸化度91.3モル%のPVA系樹脂(重合度300の酢酸ビニルを鹸化度88モル%に鹸化して得られたPVA系樹脂67質量部および重合度390の酢酸ビニルを鹸化度98モル%に鹸化して得られたPVA系樹脂33質量部からなる)
[PVA2:実施例3]重合度360で鹸化度94.7モル%のPVA系樹脂(重合度300の酢酸ビニルを鹸化度88モル%に鹸化して得られたPVA系樹脂33質量部および重合度390の酢酸ビニルを鹸化度98モル%に鹸化して得られたPVA系樹脂67質量部からなる)
[PVA3:実施例4]重合度390で鹸化度98.5モル%のPVA系樹脂
[PVA4:実施例5]重合度372で鹸化度96.2モル%のPVA系樹脂
[PVA5:実施例6]重合度381で鹸化度97.1モル%のPVA系樹脂
なお、PVA3およびPVA5から製造した温水溶解性雄型成形面ファスナーは、ともに表面の雄型係合素子が途中までしかないものが目立った。特にPVA3から製造したものは、雄型係合素子が不完全な形状のものがかなり目立った。その原因として、成形の際にキャビティの先端部まで樹脂が充填されなかったことが挙げられるが、これにより係合強力が大きく低下することはなかった。
上記実施例1において、成形に使用するPVA系樹脂を、次のPVA6~7のいずれかに変更して樹脂組成物b-1~b-3を製造する以外は実施例1と同様にして、温水溶解性雄型成形面ファスナーを製造した。なお、PVA6に関しては、雄型係合素子の強度が低く、成形中において容易に折れ、またPVA8に関しては、溶融粘度が高く過ぎて金型内でゲル化を生じ、キャビティの先端まで溶融樹脂が到達できず、その結果、共に、まともな雄型成形面ファスナーを製造できなかった。一方、PVA7に関しては、成形において全く問題はなく、実施例1と同様の形状を有する雄型成形面ファスナーが得られた。
[PVA6:比較例1]重合度250で鹸化度74モル%のPVA系樹脂
[PVA7:比較例2]重合度500で鹸化度75モル%のPVA系樹脂
[PVA8:比較例3]重合度1200で鹸化度99.9モル%のPVA系樹脂
このPVA8からの雄型成形面ファスナーように水溶解温度が高いと、使い捨て製品からパルプを回収し、それを再度、湿式不織布化する工程で非常に高温の水を大量に必要とすることから、経済性の点で採用できないものであることが分かる。
逆に、PVA7からの面ファスナーのように水溶解温度があまりに低いと、使い捨ておむつに使用すると尿により溶解することが懸念され、それを回避するために、尿に触れない特殊な構造とすることが求められ、この点で汎用的でないことが分かった。
上記実施例1において、成形に使用する金型ロールとして、その表面に彫られているキャビティの深さが1.2mmの厚さ0.3mmのリング状金型を使用して、実施例1と同様の樹脂組成物a-1を使用して温水溶解性雄型成形面ファスナーを製造した。得られた水溶性雄型成形面ファスナーは高さ1.26mmの雄型係合素子を素子密度136本/cm2で有していた。この面ファスナーの表面は、図3に示すようなもの、すなわち複数の雄型係合素子が列をなして並んでおり、各係合素子は基体表面から立ち上がり、その途中から列方向に曲がり、その先端部は基体表面に近づく方向を向いている形状(逆J字型)の雄型係合素子を複数有するものであり、また基体の厚さは0.23mmであった。得られた温水溶解性雄型成形面ファスナーの性能を下記の表3に示す。
ただ使い捨ておむつや生理用品等の肌着への取り付け材として使用した場合には、肌触りの点で劣ることから、その取り付け方法に工夫を要するものであった。しかしながら、得られた雄型成形面ファスナーは、使い捨ておむつの腰部固定材として使用した場合、着用中に尿により溶けることもなかった。使用後に、実施例1の場合と同様に、使い捨ておむつを丸く折り畳み、この状態で使い捨てオムツに取り付けられている温水溶解性雄型成形面ファスナーを用いて、折り畳み状態を固定した。そしてこの状態で80℃の攪拌温水中に浸漬したところ、雄型面ファスナーが溶けて消失し、そして使い捨ておむつが折り畳み状態から解放されて広がり、その後の処理がし易い状態となった。また、実施例の面ファスナーはいずれも水温49℃未満で溶解するものでは無かった。
上記実施例1において、成形に使用する金型ロールのキャビティの形状として、深さ0.55mmのY字型形状の切れ込みを外円周上に彫った厚さ0.3mmのリング状金型を使用し、実施例1と同様の樹脂組成物a-1を使用して温水溶解性雄型成形面ファスナーを製造した。得られた温水溶解性雄型成形面ファスナーは、その表面に存在している雄型係合素子が列をなして並んでおり、各係合素子は基体表面から立ち上がり、その途中で列方向の前後に分かれて列方向に曲がり、分かれた各先端部は基体表面に近づく方向を向いている形状、すなわちY字型形状を有しており、その高さは0.55mmであり、そして素子密度は147本/cm2であり、基体の厚さは0.18mmであった。得られた温水溶解性雄型成形面ファスナーの性能を下記の表3に示す。
使用後に、使い捨ておむつを丸く折り畳み、この状態で使い捨てオムツに取り付けられている温水溶解性雄型成形面ファスナーを用いて、折り畳み状態を固定した。そしてこの状態で80℃の攪拌温水中に浸漬したところ、たちどころに雄型面ファスナーが溶けて消失し、使い捨ておむつが折り畳み状態から解放されて広がり、その後の処理がし易い状態となった。また、実施例の面ファスナーはいずれも水温49℃未満で溶解するものでは無かった。
上記実施例1において、PVA系樹脂に混合するポリエチレングリコールをソルビトールのエチレンオキサイド2モル%付加物に変更して樹脂組成物a-7を製造する以外は実施例1と同様にして、温水溶解性雄型成形面ファスナーを製造した。得られた雄型成形面ファスナーは、実施例1のものと同等に複数の雄型係合素子が列をなして並んでおり、各雄型係合素子は基体表面に形成された畝状膨らみ部(高さ0.03mm)の上から立ち上がり、その途中から列方向に曲がり、その先端部は基体表面に近づく方向を向いている形状(逆J字型)で、その高さは0.94mm、さらに素子密度は110本/cm2であった。また基体の厚さは0.21mmであった。得られた温水溶解性雄型成形面ファスナーの性能を下記の表4に示す。
実施例1のものと同等の優れた温水溶解性および係合力を有し、さらに表面のべたつき性に関しても実施例1のものと同様に全く感じられず、使いやすさの点で優れたものであった。さらに肌に触れる用途に使用しても、肌触りの点で優しく優れており、着用中に尿により溶けることもなく、使用上の問題は全くなかった。
上記実施例1において、成形に使用する樹脂組成物a-1を、次の樹脂組成物a-8~a-11に変更する以外は実施例1と同様にして、4種類の温水溶解性雄型成形面ファスナーを製造した。
[樹脂組成物a-8:実施例10]上記実施例1において、添加するポリエチレングリコールおよびタルクの量を、PVA系樹脂100質量部に対してポリエチレングリコール38質量部およびタルク22質量部に変更する以外は実施例1と同様にして製造
[樹脂組成物a-9:実施例11]上記実施例1において、添加するポリエチレングリコールおよびタルクの量を、PVA系樹脂100質量部に対してポリエチレングリコール10質量部およびタルク5質量部に変更する以外は実施例1と同様にして製造
[樹脂組成物a-10:実施例12]上記実施例1において、添加するポリエチレングリコールを数平均分子量600のものに変更する以外は実施例1と同様にして製造
[樹脂組成物a-11:実施例13]上記実施例1において、添加するタルクを平均粒子径1.5μmのものに変更する以外は実施例1と同様にして製造
2:基体
T:雄型係合素子の列方向
Claims (13)
- 基体および該基体表面から突出する複数の雄型係合素子を有している雄型面ファスナーであって、前記基体および前記雄型係合素子がともにポリビニルアルコール系樹脂を含み、かつ前記基体および前記雄型係合素子がともに水温45~90℃の温水に溶解するが、45℃未満の水には溶解しないことを特徴とする温水溶解性雄型面ファスナー。
- 複数の前記雄型係合素子が列をなして並んでおり、前記雄型係合素子は前記基体表面から立ち上がり、その途中から前記列方向に曲がり、その先端部は前記基体表面に近づく方向を向いている形状、または前記雄型係合素子は前記基体表面から立ち上がり、その途中で前記列方向の前後に分かれて前記列方向に曲がり、分かれた先端部は前記基体表面に近づく方向を向いている形状を有している請求項1に記載の温水溶解性雄型面ファスナー。
- 前記基体および前記雄型係合素子が、ともに、重合度300~700の範囲で、鹸化度80~99モル%の範囲である前記ポリビニルアルコール系樹脂からなる請求項1または2に記載の温水溶解性雄型面ファスナー。
- 前記基体および前記雄型係合素子が、前記ポリビニルアルコール系樹脂に、多価アルコールまたはエチレンオキサイド系重合体が前記ポリビニルアルコール系樹脂100質量部に対して5~45質量部添加されている樹脂組成物からなる請求項1~3のいずれかに記載の温水溶解性雄型面ファスナー。
- 前記基体および前記雄型係合素子が、ポリビニルアルコール系樹脂に、層状無機粒子がポリビニルアルコール系樹脂100質量部に対して4~25質量部添加されている樹脂組成物からなる請求項1~4のいずれかに記載の温水溶解性雄型面ファスナー。
- 前記雄型係合素子が、前記基体表面から立ち上がり、その途中から前記列方向に曲がり、その先端部は前記基体表面に近づく方向を向いている形状を有している場合には、前記雄型係合素子の前記基体表面から前記雄型係合素子の頂部までの高さが1.2mm以下であり、前記雄型係合素子が、その途中で前記列方向の前後に分かれてそれぞれ前記列方向に曲がり、前記分かれた先端部は前記基体表面に近づく方向を向いている形状を有している場合には、前記雄型係合素子の前記基体表面から前記雄型係合素子の頂部までの高さが0.6mm以下である請求項2に記載の温水溶解性雄型面ファスナー。
- 前記多価アルコールまたは前記エチレンオキサイド系重合体がポリエチレングリコールであり、その数平均分子量300~700の範囲である請求項4に記載の温水溶解性雄型面ファスナー。
- 前記層状無機粒子がタルクである請求項5に記載の温水溶解性雄型面ファスナー。
- 請求項1~8のいずれかに記載の温水溶解性雄型面ファスナーと、水温45~90℃の温水に溶解するが、45℃未満の水には溶解しないポリビニルアルコール系樹脂を含むループ繊維から構成される温水溶解性ループ面ファスナーとの組み合わせ。
- 温水溶解性ループ面ファスナーが、不織布または織編物を基布とし、その表面にループ繊維が存在している請求項9に記載の組み合わせ。
- 下記(A)を満足している金属ロールの表面に下記(1)と(2)を満足する樹脂組成物の溶融物を流すとともに前記金属ロール表面に穿孔した雄型係合素子形状のキャビティ内に前記溶融物を圧入し、その状態で前記溶融物を冷却固化させた後、前記金属ロール表面から剥離するとともに前記キャビティから引き抜く温水溶解性雄型面ファスナーの製造方法。
(A)前記金属ロールが、前記キャビティを外円周上に複数彫ったリング状金型を重ね合わせたものであり、前記金属ロールの表面に、複数の前記キャビティが前記金属ロールの円周方向に列をなして並んでおり、前記キャビティは、途中で前記キャビティの前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている、あるいは途中で二股に分かれてそれぞれ前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている
(1)ポリビニルアルコール系樹脂と、多価アルコールまたはエチレンオキサイド系重合体と、層状無機粒子を含む樹脂組成物からなり、前記樹脂組成物の混合割合が、前記ポリビニルアルコール系樹脂100質量部に対して前記多価アルコールまたは前記エチレンオキサイド系重合体が5~45質量部の範囲、前記層状無機粒子が4~25質量部の範囲である
(2)前記ポリビニルアルコール系樹脂が、重合度300~700で、鹸化度80~99モル%の範囲である - 前記キャビティが、途中で前記キャビティの前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている形状を有している場合には、前記キャビティの前記金属ロール表面からの深さがもっとも深いところで1.2mm以下、または前記キャビティが途中で二股に分かれてそれぞれ前記列方向に曲がり、その先端部は前記金属ロール表面に近づいている形状を有している場合には、前記キャビティの前記金属ロール表面からの深さがもっとも深いところで0.6mm以下である請求項11に記載の温水溶解性雄型面ファスナーの製造方法。
- 請求項1~8のいずれかに記載の前記温水溶解性雄型面ファスナーが取り付けられた使い捨ておむつまたは生理用品。
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JPH06220287A (ja) * | 1993-01-22 | 1994-08-09 | Kuraray Co Ltd | ポリビニルアルコール系樹脂組成物 |
JPH09313218A (ja) * | 1996-05-31 | 1997-12-09 | Ykk Corp | 面ファスナー |
JPH11181306A (ja) * | 1997-12-25 | 1999-07-06 | Ykk Corp | 生分解性樹脂成形品 |
WO2019159756A1 (ja) * | 2018-02-14 | 2019-08-22 | 株式会社クラレ | 樹脂材料、その製造方法、及び水溶性フィルム |
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JPH06220287A (ja) * | 1993-01-22 | 1994-08-09 | Kuraray Co Ltd | ポリビニルアルコール系樹脂組成物 |
JPH09313218A (ja) * | 1996-05-31 | 1997-12-09 | Ykk Corp | 面ファスナー |
JPH11181306A (ja) * | 1997-12-25 | 1999-07-06 | Ykk Corp | 生分解性樹脂成形品 |
WO2019159756A1 (ja) * | 2018-02-14 | 2019-08-22 | 株式会社クラレ | 樹脂材料、その製造方法、及び水溶性フィルム |
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US20230112098A1 (en) * | 2020-02-27 | 2023-04-13 | Kuraray Fastening Co., Ltd. | Water-soluble male molded hook-and-loop fastener and method for producing same |
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