KR102261405B1 - Hot melt adhesive composition - Google Patents

Abstract

The present invention relates to a hot-melt adhesive composition, and more particularly, to a hot-melt adhesive composition for bonding pure cotton, which has excellent adhesion to pure cotton fibers and is excellent in maintaining adhesive strength even in contact with water, and a hot-melt adhesive pure cotton product comprising the same .

Description

Hot melt adhesive composition {HOT MELT ADHESIVE COMPOSITION}

The present invention relates to a hot-melt adhesive composition, and more particularly, to a hot-melt adhesive composition for bonding pure cotton, which has excellent adhesion to pure cotton fibers and is excellent in maintaining adhesive strength even in contact with water, and a hot-melt adhesive pure cotton product comprising the same .

Hot melt adhesives are widely used for various purposes such as assembly and packaging of products, and are generally heated at a high temperature of 150 to 250 ° C, applied to the substrate in a molten state, and then cooled to show adhesive performance, making mass production easy with a simple process has one advantage.

Such hot melt adhesives have long been applied to disposable non-woven products, such as disposable diapers, adult incontinence products, and feminine hygiene products. The disposable nonwoven product is composed of a polyethylene sheet and a polypropylene nonwoven fabric, and the product is manufactured by bonding the sheet and the nonwoven fabric using a hot melt adhesive.

Meanwhile, as carcinogens were recently detected in sanitary napkins, which are sanitary products for women, a controversy arose, and the number of consumers looking for environmentally friendly and harmless organic cotton sanitary napkins has increased significantly. Conventional sanitary napkins containing a large amount of harmful substances not only cause various side effects such as skin irritation, itching, allergies and dermatitis to users with sensitive skin, but also do not biodegrade, causing environmental pollution due to landfill after disposal.

In contrast, organic cotton sanitary napkins are sanitary napkins that are grown without the use of synthetic fertilizers, pesticides and pesticides using cotton seeds that have not undergone genetic modification. It has the advantage of excellent tactile feel and wearing comfort.

However, in order to apply the organic cotton, that is, pure cotton fiber to a sanitary napkin, it is necessary to adhere the pure cotton fiber to the nonwoven fabric, but the conventional hot melt adhesive has a problem in that the adhesive force to the pure cotton fiber is very weak.

In particular, as the sanitary napkin is used, the hot melt adhesive loses adhesion due to moisture absorbed into the cotton fibers, causing separation between the cotton fibers and the nonwoven fabric as well as separation between the nonwoven fabric and the sheet.

Due to these problems, it is difficult to apply pure cotton fibers to actual sanitary napkins, but there is no way to solve the problems of low cotton adhesion and water durability of hot melt adhesives until now. is currently doing.

Accordingly, the development of an adhesive having excellent durability as it has excellent adhesion to pure cotton fibers and maintains adhesion even in contact with water is required.

Republic of Korea Patent Publication No. 10-2018-0130522 (2018.12.07.)

An object of the present invention is to provide a hot melt adhesive composition that exhibits excellent adhesion to pure cotton fibers and maintains high adhesion even in contact with water, and a pure cotton product comprising the same.

The present invention for achieving the above object provides a hot-melt adhesive composition for bonding a pure surface, the melting point of the olefin-based resin comprising a propylene repeating unit of 70 to 120 ℃; hydrogenated styrenic block copolymer; and hydrocarbon-based adhesive resins.

In one aspect of the present invention, the hot melt adhesive composition for bonding a pure surface may include 1 to 20% by weight of an olefin-based resin, 5 to 40% by weight of a hydrogenated styrene-based block copolymer, and 40 to 80% by weight of a hydrocarbon-based adhesive resin have.

In one aspect of the present invention, the olefin-based resin may have a propylene repeating unit content of 50 to 95 mol%.

In one aspect of the present invention, the weight ratio of the olefin-based resin and the hydrogenated styrenic block copolymer may be 1: 1 to 2.

In one embodiment of the present invention, the hydrogenated styrene-based block copolymer is a styrene-ethylene-butylene-styrene block copolymer (SEBS), a styrene-ethylene-propylene-styrene block copolymer (SEPS), and a styrene-ethylene-propylene block. It may be any one or a mixture of two or more selected from a copolymer (SEP), a styrene-ethylene-ethylene-propylene-styrene block copolymer (SEEPS), and a styrene-butylene-butadiene-styrene block copolymer (SBBS).

In one aspect of the present invention, the hydrocarbon-based adhesive resin may be a hydrogenated hydrocarbon-based adhesive resin.

In one aspect of the present invention, the hot-melt adhesive composition for bonding pure surface may have a softening point of 130° C. or less.

In one aspect of the present invention, the hot melt adhesive composition for bonding pure surface may further include any one or a mixture of two or more selected from lubricants, waxes, plasticizers and antioxidants.

In addition, the present invention is a first substrate; second base; And it provides a disposable product comprising a; and a hot-melt adhesive composition for bonding a pure surface formed on the interface between the first substrate and the second substrate.

In one aspect of the present invention, the disposable product may be selected from diapers, adult incontinence products, feminine hygiene products, and medical bands.

In one aspect of the present invention, at least one or more of the first and second substrates may be pure cotton fibers.

In addition, the present invention provides a method for producing the disposable product, the melting point of heating a hot melt adhesive composition comprising an olefin-based resin containing a propylene repeating unit of 70 to 120 ℃, a hydrogenated styrene-based block copolymer, and a hydrocarbon-based adhesive resin step; applying the heated hot melt adhesive composition to a first substrate; and laminating a second substrate on the first substrate to which the hot-melt adhesive composition is applied and bonding the second substrate by thermocompression bonding.

In one aspect of the present invention, the step of applying the hot melt adhesive composition may be performed at 80 to 150 ℃.

In one aspect of the present invention, the disposable product may include pure cotton fibers.

The hot-melt adhesive composition for bonding pure cotton according to the present invention has an advantage in that it not only has excellent adhesion to pure cotton fibers, but also maintains high adhesion even in contact with water.

In addition, the pure cotton product including the hot melt adhesive composition for bonding pure cotton according to the present invention has the advantage of exhibiting excellent durability without separation between the substrates.

In addition, the pure noodle product according to the present invention has the advantage that it can be manufactured only by a simple process at a relatively low temperature.

Hereinafter, the present invention will be described in more detail through embodiments or examples including the accompanying drawings. However, the following specific examples or examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Unless otherwise defined in technical terms and scientific terms used in the specification of the present invention, those of ordinary skill in the art to which this invention belongs have the meanings commonly understood, and in the following description and accompanying drawings, the present invention Description of known functions and configurations that may unnecessarily obscure the gist of will be omitted.

In addition, the singular form used in the specification of the present invention may also be intended to include the plural form unless the context specifically dictates otherwise.

In addition, in the specification of the present invention, the unit used without special mention is based on the weight, for example, the unit of % or ratio means weight % or weight ratio.

In addition, the numerical range used in the specification of the present invention includes the lower limit and upper limit and all values within the range, increments logically derived from the form and width of the defined range, all values limited thereto, and numerical ranges defined in different forms. All possible combinations of upper and lower limits are included. As an example, when the molecular weight is 100 to 10,000, and specifically limited to 500 to 5,000, a numerical range of 500 to 10,000 or 100 to 5,000 should also be interpreted as described in the specification of the present invention. Unless otherwise defined in the specification of the present invention, values outside the numerical range that may occur due to experimental errors or rounding of values are also included in the defined numerical range.

In addition, in the specification of the present invention, the expression "comprising" is an open-ended description having an equivalent meaning to expressions such as "having", "containing", "having" or "characterized by", and additionally listed It does not exclude elements, materials or processes that do not exist. Also, “really… The expression "consisting of" means that other elements, materials, or processes not listed together with the specified element, material or process do not unacceptably significantly affect at least one basic and novel technical idea of the invention. It means that it can exist in quantity. Also, the expression “consisting of” means that only the elements, materials, or processes described are present.

In addition, in the specification of the present invention, "molecular weight" of a polymer means "weight average molecular weight" unless otherwise defined, and the weight average molecular weight and molecular weight distribution (weight average molecular weight / number average molecular weight) are measured by gel permeation chromatography (Gel Permeation). Measured by chromatography).

Hot Melt Adhesive Composition for Pure Cotton Adhesive

A first aspect of the present invention relates to a hot-melt adhesive composition for bonding pure cotton that has excellent adhesion to pure cotton and maintains adhesive strength even when in contact with water.

The hot-melt adhesive composition for bonding a pure surface according to the present invention comprises: an olefin-based resin comprising a propylene repeating unit having a melting point of 70 to 120°C; hydrogenated styrenic block copolymer; and hydrocarbon-based adhesive resins.

The hot-melt adhesive composition according to the present invention has the effect of remarkably improving the adhesion to pure cotton by using the olefin-based resin together with the hydrogenated styrene-based block copolymer and the hydrocarbon-based adhesive resin.

Specifically, the olefin-based resin essentially includes a propylene repeating unit, and may have a melting point of 70 to 120°C, specifically 80 to 110°C, and more specifically 90 to 100°C. The hot-melt adhesive composition prepared by having a melting point in the above range has excellent compatibility at high temperatures and excellent adhesion to various substrates including pure cotton fibers.

Preferably, as the olefin-based resin, any one selected from a polypropylene homopolymer and an ethylene-propylene copolymer having a melting point in the above range or a mixture thereof may be used. The polypropylene homopolymer may preferably be a polypropylene (metallocene polypropylene, Metallocene polypropylene, m-PP) prepared under a metallocene catalyst.

In addition, the olefin-based resin may specifically be an elastic polypropylene-based resin including a propylene repeating unit in a polymer main chain, and preferably, the elastic polypropylene-based resin may be an elastic ethylene-propylene random copolymer, but is limited thereto it is not

In addition, the weight average molecular weight of the olefin-based resin is not limited, but may be 10,000 to 1,000,000 g/mol, specifically 20,000 to 500,000 g/mol, and more specifically 50,000 to 300,000 g/mol.

The density of the olefin-based resin may be 0.92 g/cm ³ or less at 25° C., preferably 0.91 g/cm ³ or less, and more preferably 0.905 g/cm ³ or less. The lower limit of the density of the olefin-based resin may be ^{0.80 g/cm 3 or more.}

In one aspect of the hot melt adhesive composition for bonding pure cotton according to the present invention, the propylene repeating unit content of the olefin-based resin may be 50 to 95 mol%, specifically 65 to 93 mol%, more specifically 75 to 90 mol% have. By including the propylene repeating unit in the above range, the olefin-based resin and the hydrogenated styrenic block copolymer are homogeneously mixed, and adhesion to the pure cotton can be significantly improved. In particular, it is applied as an adhesive to diapers and feminine hygiene products containing pure cotton fibers, and has an excellent effect of imparting excellent adhesion and durability between the base material constituting the product and the pure cotton fibers.

In addition, the hydrogenated styrene-based block copolymer may be used without limitation as long as it is a hydrogenated styrene-based block copolymer, specifically styrene-ethylene-butylene-styrene (SEBS). ), styrene-ethylene-propylene-styrene block copolymer (styrene-ethylene-propylene-styrene, SEPS), styrene-ethylene-propylene block copolymer (styrene-ethylene-propylene, SEP), styrene-ethylene-ethylene-propylene- It may be any one or a mixture of two or more selected from styrene-ethylene-ethylene-propylene-styrene (SEEPS) and styrene-butylene-butadiene-styrene block copolymer (SBBS). As a preferred embodiment of the hydrogenated styrene-based block copolymer, styrene-ethylene-butylene-styrene block copolymer (styrene-ethylene-butylene-styrene, SEBS) or styrene-ethylene-propylene-styrene block copolymer (styrene- ethylene-propylene-styrene, SEPS).

In addition, the content of styrene in the hydrogenated styrene-based block copolymer is not particularly limited, but may be 5 to 50% by weight, specifically 12 to 35% by weight.

By using the hydrogenated styrenic block copolymer with an olefin-based resin and a hydrocarbon-based adhesive resin having a melting point of 70 to 120°C and containing a propylene repeating unit, excellent adhesion to pure cotton as well as excellent adhesion in water is maintained. It has excellent holding power.

In a preferred aspect of the hot-melt adhesive composition for bonding a pure surface according to the present invention, the olefin-based resin including the propylene repeating unit may be an ethylene-propylene copolymer resin, preferably an ethylene-propylene elastic copolymer resin, The hydrogenated styrene-based block copolymer may be a hydrogenated styrene-based block copolymer including ethylene as a repeating unit. As the ethylene-propylene elastic copolymer resin and the hydrogenated styrenic block copolymer containing ethylene as a repeating unit contain ethylene as a common repeating unit, the hot melt adhesive composition can exhibit excellent compatibility, and the adhesive strength to the pure surface is excellent. Remarkably improved, it does not cause separation between pure cotton fibers and non-woven fabrics even when in contact with moisture.

Specifically, hygiene products such as diapers are composed of a first substrate including a moisture absorbent and a second substrate having a waterproof function so as not to release moisture to the outside. There is a problem in that the pure cotton fibers are separated from the product while being stored therein, resulting in damage to the product and loss of its function. This is because the hot melt adhesive applied to conventional hygiene products not only has low adhesion to pure cotton fibers, but also loses adhesion when in contact with moisture. The hot melt adhesive composition according to the present invention has excellent adhesion to pure cotton and durability against water This is improved, and the effect of maintaining excellent adhesion without deterioration due to moisture even when worn for a long time is excellent.

In one aspect of the hot-melt adhesive composition for bonding a pure surface according to the present invention, the weight ratio of the olefin-based resin and the hydrogenated styrenic block copolymer is 1: 0.1 to 10, specifically 1:1 to 5, more specifically 1:1 to 2 may be By using the olefin-based resin and the hydrogenated styrene-based block copolymer in the above range, it has excellent peel strength, and at the same time, durability against water is remarkably improved, thereby exhibiting excellent adhesion even in contact with moisture. Accordingly, there is an advantage that can be used as an adhesive for various products requiring waterproofness as well as the above-mentioned pure cotton products.

The hydrocarbon-based adhesive resin is used to impart adhesiveness to the hot melt adhesive composition, for example, aromatic hydrocarbon-based resins, aliphatic hydrocarbon-based resins, cyclic hydrocarbon-based resins, terpenes, and terpene-based copolymer resins containing the same as repeating units. and, preferably, may be a hydrogenated hydrocarbon-based resin prepared through a known hydrogenation reaction.

When the above hydrogenated hydrocarbon-based adhesive resin is used, it has excellent compatibility with olefin-based resins and hydrogenated styrene-based block copolymers, and simultaneously improves pure surface adhesion and water durability, and has an excellent effect of not generating a peculiar odor. .

In addition, when the hydrogenated hydrocarbon-based adhesive resin is melted together with the olefin-based resin and hydrogenated styrenic block copolymer of the present invention and then sprayed and applied to the substrate, the effect of uniformly applied to the substrate without the formation of filaments is excellent, so pure cotton The coating uniformity of the hot-melt adhesive composition for bonding is significantly improved.

As a preferred example of the hydrogenated hydrocarbon-based adhesive resin, it may be preferably obtained by hydrogenating a hydrocarbon-based resin including a styrene-based monomer and a polycyclic aromatic monomer as repeating units. As a specific example, the styrene-based monomer may be styrene or methylstyrene, and the polycyclic aromatic monomer may be indene. For example, a hydrogenated hydrocarbon-based resin obtained by hydrogenating methylstyrene and an indene copolymer resin can be exemplified as a preferred adhesive resin.

In one aspect of the hot-melt adhesive composition for bonding a pure surface according to the present invention, the hot-melt adhesive composition for bonding a pure surface includes 1 to 20% by weight of an olefin-based resin, 5 to 40% by weight of a hydrogenated styrenic block copolymer, and 40 to 40% by weight of a hydrocarbon-based adhesive resin 80% by weight. The hot melt adhesive composition may specifically include 2 to 15% by weight of an olefin-based resin, 10 to 30% by weight of a hydrogenated styrenic block copolymer, and 50 to 70% by weight of a hydrocarbon-based adhesive resin, but is not limited thereto.

In one aspect of the hot-melt adhesive composition for bonding a pure surface according to the present invention, the softening point of the hot-melt adhesive composition for bonding a pure surface may be 130° C. or less, specifically 110° C. or less, and more specifically 75 to 105° C., but is limited thereto. it is not Compared to the conventional hot melt adhesive composition generally melted at a high temperature of 150 to 250 ° C. and applied to the substrate, the hot melt adhesive composition according to the present invention has a softening point in the above range, and is melted at a relatively low temperature of 150 ° C. or less. Since the bonding process may be performed, there is an effect of preventing damage to the substrate.

In addition, the hot-melt adhesive composition for bonding a pure surface according to the present invention may have an Upper Critical Solution Temperature (UCST) in a temperature range of 60 to 90°C, and preferably may have a UCST in a temperature range of 60 to 80°C. At a temperature below the UCST, the hot melt adhesive composition may be present in a fine phase-separated state while the miscibility is lowered. The fine phase-separated hot-melt adhesive composition can maintain a stable fine phase-separation structure at room temperature, and the fine phase-separation structure can preferably induce excellent adhesion between the pure cotton fibers and the nonwoven fabric.

In one aspect of the hot-melt adhesive composition for bonding a pure surface according to the present invention, the hot-melt adhesive composition for bonding a pure surface may further include any one or a mixture of two or more selected from known lubricants, waxes, plasticizers and antioxidants.

Although not limited as the lubricant, specifically, for example, paraffinic oil and naphthenic oil may be mentioned, and preferably paraffinic oil. The lubricant may be included in an amount of 1 to 30% by weight, preferably 10 to 30% by weight, based on the total weight of the hot melt adhesive composition for bonding pure cotton, but is not limited thereto.

In addition, although not limited as the wax, specifically, for example, paraffin wax and microcrystalline wax may be mentioned, and preferably paraffin wax. The wax may be included in an amount of 1 to 10 wt%, preferably 2 to 8 wt%, based on the total weight of the hot melt adhesive composition for bonding pure cotton, but is not limited thereto.

In addition, although not limited as the plasticizer, specifically, for example, glycerin, glycerin diacetate, pentaerythritol, sorbitol and ethylene glycol may be mentioned, and 1 to 10 based on the total weight of the hot melt adhesive composition for bonding the pure surface It may be included in weight %, but is not limited thereto.

In addition, although not limited as the antioxidant, specifically, for example, thioester, phosphate, aromatic amine, hindered phenol, tetrakis (methylene-3-(3′,5′-di-t-butyl-4′) -Hydroxyphenyl) propionate) methane, 2,2'-ethylidene bis (4,6-di-tert-butyl phenol), 1,1-tris (2-methyl-4-hydroxy-5-t -Butyl phenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-tert-butyl-4-hydroxybenzyl) benzene, dilauryl thiodipropionate, pentaerythritol tetra kiss (β-lauryl thiopropionate) polyphosphate and thiophosphite, and the like, and may be included in an amount of 1 to 5% by weight based on the total weight of the hot-melt adhesive composition for bonding pure cotton, but is not limited thereto.

Disposable Products Comprising Hot Melt Adhesive Compositions

In addition, the second aspect of the present invention provides a disposable product comprising the hot-melt adhesive composition for bonding the pure surface.

The disposable product includes a first substrate; second base; and a hot melt adhesive composition formed on the interface between the first and second substrates.

The first and second substrates may be used without limitation as long as they are substrates used for disposable products, and specifically, for example, new and recycled craft, high-density and low-density kraft, chipboard, polyethylene, and Mylar. (mylar), polypropylene, polyvinylidene chloride and ethylene vinyl acetate.

In addition, the disposable products include, for example, industrial work clothes, medical gowns, masks, toilet training pants, swimwear, diapers, adult incontinence products, feminine hygiene products and medical bands, and preferably contains pure cotton fibers. diapers, adult incontinence products, feminine hygiene products, and medical bands.

In one aspect of the present invention, at least one or more of the first and second substrates may be pure cotton fibers.

Among the above disposable products, especially diapers, adult incontinence products, feminine hygiene products, and medical bands are in direct contact with the skin of the local area, so there is a problem that causes various side effects such as skin irritation, itching, allergies and dermatitis for sensitive users. .

However, the disposable product including the hot-melt adhesive composition for bonding pure cotton of the present invention can exhibit excellent air permeability as well as provide excellent tactile and wearability to the user by including the above-mentioned pure cotton fiber as a base material.

Manufacturing method of disposable products using hot melt adhesive composition

In addition, a third aspect of the present invention provides a method for manufacturing a disposable product using the hot melt adhesive composition for bonding pure cotton. More specifically, heating a hot-melt adhesive composition comprising an olefin-based resin including a propylene repeating unit having a melting point of 70 to 120°C, a hydrogenated styrene-based block copolymer, and a hydrocarbon-based adhesive resin; Applying the heated hot-melt adhesive composition to a first substrate; and laminating a second substrate on the first substrate to which the hot-melt adhesive composition is applied and bonding the second substrate by thermocompression bonding; In a method of manufacturing a disposable product comprising it's about

The heating step of the hot-melt adhesive composition is a step of preparing a uniform solution by heating the hot-melt adhesive composition to a softening point or higher. Specifically, the step of preparing a uniform solution is, for example, uniformly mixing the hot melt adhesive composition at 80 to 160° C. using a known mixing device such as a kneader rudder, an extruder, a mixing roll, or a Banbury mixer. It is not limiting.

Subsequently, the step of applying the hot-melt adhesive composition is a step of heating the previously mixed hot-melt adhesive composition to a softening point or higher to apply the hot-melt adhesive composition to the first substrate in a molten state. Specifically, the applying step may be performed at 80 to 180 ℃, specifically 130 to 160 ℃.

In addition, as a specific example of the application method, the hot melt adhesive composition melted in the above temperature range may be applied to the substrate using a known spraying device or coating device. More specifically, a non-contact method of spraying the hot-melt adhesive composition on the substrate using a spraying device or a contact-type method of applying the hot-melt adhesive composition on the substrate using a slot coater or the like may be used.

In a preferred embodiment, the hot melt adhesive composition according to the present invention may be coated by a non-contact method, and a uniform adhesive layer may be formed on the substrate by spraying on the substrate by a non-contact method. Specific examples of the non-contact method include spraying the melted hot melt adhesive composition from a nozzle using a known spraying device, for example, Nordson's spraying device, and applying the melted hot melt adhesive composition to the substrate, but is not limited thereto. On the other hand, in the case of a hot-melt adhesive composition having poor application uniformity, it is also included in one aspect according to the present invention to form an adhesive layer by being applied on a substrate in a contact-type manner.

Subsequently, the step of laminating and thermocompression bonding the second substrate on the first substrate to which the hot-melt adhesive composition is applied is a step of applying the hot-melt adhesive composition to the interface between the first substrate and the second substrate to adhere them. Specifically, by laminating a second substrate on the hot-melt adhesive composition applied in a molten state on the first substrate and cooling the second substrate, the hot-melt adhesive composition can be cured and the two substrates can be adhered. Alternatively, after the lamination, the substrate may be adhered to the substrate by compression using a known compression roll or the like, followed by cooling, but is not limited thereto.

In one aspect of the method for manufacturing a disposable product according to the present invention, the disposable product manufactured by the above manufacturing method may include pure cotton fibers. Specifically, it may be a pure cotton disposable product in which at least one or more of the first and second substrates are pure cotton fibers.

In addition, the hot melt adhesive composition for pure surface bonding according to the present invention is prepared in a sheet or film shape using, for example, a hot melt coating method, a T-die method, an inflation method, a calender molding method and a lamination method, and then heated and melted to be used. can

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following Examples and Comparative Examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

(evaluation)

1. Water-resistant adhesion

The prepared disposable pure cotton product was immersed in 500 mL of water for 1 hour and then taken out, and the degree of peeling of the cotton sheet was visually observed and evaluated as a score. A total of 100 disposable cotton products were tested, indicating the number of disposable cotton products that were not peeled off.

2. Peel strength

Peel strength was measured at 25°C using a tensile strength tester. In a state where one jig of the tensile strength tester was fixed to the manufactured disposable pure cotton product, the peel strength applied by pulling the jig at a speed of 300 mm/min was repeatedly measured 10 times to obtain an average value.

3. Application Uniformity

During spray application of the hot melt adhesive composition, the uniformity of the coating was evaluated by visually observing whether the hot melt adhesive composition was uniformly applied to the substrate. At this time, a total of 100 disposable cotton products were prepared, indicating the number of disposable cotton products in which the hot melt adhesive composition was uniformly applied to the substrate without the formation of filaments during the spraying process.

Specific contents of the hot melt adhesive compositions of Examples 1 to 7 and Comparative Examples 1 to 4 are shown in Table 1 below.

[Example 1]

7 parts by weight of metallocene-polypropylene (m-PP) having a melting point of 100° C. and a weight average molecular weight of 78,910 g/mol (molecular weight distribution: 8.24), and a weight average molecular weight of 68,999 g/mol (molecular weight distribution: 3.45) 10 parts by weight of a styrene-ethylene-butylene-styrene block copolymer (SEBS) having a styrene content of 30.5% by weight and 56 parts by weight of an aromatic modified terpene resin (YS POLYSTER T145, Yasuhara Chemical), paraffin wax (Shell GTL Sarawax SX 105) , EVONIK) 5 parts by weight, paraffin oil (Kixx LP 600, GS Caltex) 21 parts by weight, and an antioxidant (tetrakis(methylene-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl) ) propionate) methane) 1 part by weight was added to a Brabender mixer and mixed at 160° C. for 2 hours to prepare a hot-melt adhesive composition for bonding pure cotton, and it was confirmed that the softening point of the prepared composition was 90° C.

Then, a hot melt adhesive composition for pure cotton bonding prepared on a substrate on which a polyethylene film and a polypropylene spunbond are sequentially laminated and adhered is sprayed (Nordson) in a molten state at 130° C. through a spray nozzle, and then a pure cotton sheet is laminated. and adhered with a pressing roll to prepare disposable cotton products. Table 2 shows the evaluation of adhesiveness, peel strength, and application uniformity in the aqueous phase of the manufactured product.

[Example 2]

In Example 1, except that the aromatic hydrocarbon resin was replaced with an aromatic hydrocarbon resin (HIKOTACK P-90, Kolon Industries), a hot-melt adhesive composition for bonding a pure surface was prepared in the same manner as in Example 1, and the prepared composition It was confirmed that the softening point of 95 ℃. Next, a disposable pure cotton product was prepared in the same manner as in Example 1, and the adhesion, peel strength and application uniformity in the aqueous phase were evaluated, and are shown in Table 2.

[Example 3]

Pure surface adhesion was carried out in the same manner as in Example 1, except that in Example 1, the aromatic modified terpene resin was replaced with a hydrogenated methylstyrene-indene copolymer resin (SUKOREZ SU-100S, Kolon Industries), which is a hydrogenated hydrocarbon-based adhesive resin. A hot-melt adhesive composition was prepared, and it was confirmed that the softening point of the prepared composition was 94°C. Next, a disposable pure cotton product was prepared in the same manner as in Example 1, and the adhesion, peel strength and application uniformity in the aqueous phase were evaluated, and are shown in Table 2.

[Example 4]

Example 3, except that the styrene-ethylene-butylene-styrene block copolymer was replaced with a styrene-ethylene-propylene-styrene block copolymer (SEPS) having a beekeeping distribution and having a styrene content of 13.0% by weight in Example 3 A hot-melt adhesive composition for bonding pure cotton was prepared in the same manner as in 3, and it was confirmed that the softening point of the prepared composition was 91°C. The first fraction of SEPS showing the beekeeping distribution had a weight average molecular weight of 38,404 g/mol and a molecular weight distribution of 2.24, and the second fraction had a weight average molecular weight of 207,184 g/mol and a molecular weight distribution of 1.02, and the first fraction was 39.4 The second fraction accounted for 60.5% by weight.

Then, a disposable pure cotton product was prepared in the same manner as in Example 3, and the adhesion in the aqueous phase, peel strength, and application uniformity were evaluated and shown in Table 2.

[Example 5]

In the same manner as in Example 3, except that 15 parts by weight of the styrene-ethylene-butylene-styrene block copolymer and 51 parts by weight of the hydrogenated methylstyrene-indene copolymer resin were used in Example 3, the hot melt for pure surface bonding was performed. An adhesive composition was prepared, and it was confirmed that the softening point of the prepared composition was 91°C. Then, a disposable pure cotton product was prepared in the same manner as in Example 3, and the adhesion in the aqueous phase, peel strength, and application uniformity were evaluated and shown in Table 2.

[Example 6]

In Example 3, the metallocene-polypropylene was replaced with an elastic ethylene-propylene random copolymer having a weight average molecular weight of 207,331 g/mol (molecular weight distribution: 10.61) having a melting point of 97° C. and a propylene repeating unit content of 90 mol%. Except that, a hot melt adhesive composition for pure cotton bonding was prepared in the same manner as in Example 3, and it was confirmed that the softening point of the prepared composition was 92°C. Then, a disposable pure cotton product was prepared in the same manner as in Example 3, and the adhesion in the aqueous phase, peel strength, and application uniformity were evaluated and shown in Table 2.

[Example 7]

In Example 6, 3.5 parts by weight of the elastic ethylene-propylene random copolymer, a metallocene-polypropylene (m-PP) having a melting point of 100° C. and a weight average molecular weight of 78,910 g/mol (molecular weight distribution: 8.24) 3.5 parts by weight A hot melt adhesive composition for pure cotton bonding was prepared in the same manner as in Example 6 except that it was used with parts, and it was confirmed that the softening point of the prepared composition was 93°C. Then, a disposable pure cotton product was prepared in the same manner as in Example 6, and the adhesion in the aqueous phase, peel strength, and application uniformity were evaluated and shown in Table 2.

[Comparative Example 1]

Example 3 was carried out in the same manner as in Example 3, except that the styrene-ethylene-butylene-styrene block copolymer was replaced with a styrene-butadiene-styrene block copolymer (SBS, TAIPOL ^{® SBS-3206, TSRC).} Thus, disposable cotton products were prepared. Table 2 shows the evaluation of adhesion, peel strength, and application uniformity in the aqueous phase of the manufactured product.

[Comparative Example 2]

Disposable cotton products were carried out in the same manner as in Example 3 except that the styrene-ethylene-butylene-styrene block copolymer was replaced with a styrene-isoprene-styrene block copolymer (SIS, 4114N, TSRC) in Example 3 was prepared. Table 2 shows the evaluation of adhesiveness, peel strength, and application uniformity in the aqueous phase of the manufactured product.

[Comparative Example 3]

7 parts by weight of an elastic ethylene-propylene random copolymer having a weight average molecular weight of 207,331 g/mol (molecular weight distribution: 10.61) having a melting point of 97° C. and a propylene repeating unit content of 90 mol%, a hydrogenated methylstyrene-indene copolymer resin (SUKOREZ SU -100S, Kolon Industries) 56 parts by weight, paraffin wax (DNW-110S, Dongnam Petrochemical) 15 parts by weight, paraffin oil (Kixx LP 600, GS Caltex) 21 parts by weight and antioxidant (ADK STAB AO-60, Adeka Korea) ) 1 part by weight was added to a Brabender mixer and mixed at 160° C. for 2 hours to prepare a hot melt adhesive composition.

Then, a disposable pure cotton product was prepared in the same manner as in Example 1, and the adhesion in the aqueous phase, peel strength, and application uniformity were evaluated and shown in Table 2.

[Comparative Example 4]

A disposable pure cotton product was prepared in the same manner as in Example 3, except that in Example 3, no metallocene-polypropylene was used and 17 parts by weight of a styrene-ethylene-butylene-styrene block copolymer was used. Table 2 shows the evaluation of adhesiveness, peel strength, and application uniformity in the aqueous phase of the manufactured product.

Composition (parts by weight) olefinic
Suzy Hydrogenated Styrenic Block Copolymer Hydrocarbon-based adhesive resin wax slush antioxidant Example 1 m-PP(7) SEBS(10) Aromatic modified terpene resin (56) paraffin
Wax(5) paraffin
Oil(21) Tetrakis(methylene-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)propionate)methane (1) Example 2 m-PP(7) SEBS(10) Aromatic Hydrocarbon Resin (56) paraffin
Wax(5) paraffin
Oil(21) Example 3 m-PP(7) SEBS(10) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21) Example 4 m-PP(7) SEPS(10) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21) Example 5 m-PP(7) SEBS(15) Hydrogenated hydrocarbon-based adhesive resin (51) paraffin
Wax(5) paraffin
Oil(21) Example 6 Ethylene-propylene random copolymer (7) SEBS(10) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21) Example 7 Ethylene-propylene random copolymer (3.5)
m-PP(3.5) SEBS(10) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21) Comparative Example 1 m-PP(7) SBS(10) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21) Comparative Example 2 m-PP(7) SIS(10) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21) Comparative Example 3 Ethylene-propylene random copolymer (7) - Hydrogenated Hydrocarbon-Based Tacky Resin (56) Paraffin Wax(15) paraffin
Oil(21) Comparative Example 4 - SEBS(17) Hydrogenated Hydrocarbon-Based Tacky Resin (56) paraffin
Wax(5) paraffin
Oil(21)

Adhesion in water (pcs) peel strength
(g/25mm) Application uniformity (pcs) Example 1 91 182.0±7.2 5 Example 2 90 122.2±6.8 8 Example 3 95 80.8±5.7 82 Example 4 93 66.3±6.0 87 Example 5 80 53.8±5.9 81 Example 6 94 70.1±6.3 89 Example 7 100 205.3±5.1 92 Comparative Example 1 15 17.9±7.0 84 Comparative Example 2 10 8.9±6.7 81 Comparative Example 3 25 47.8±7.3 83 Comparative Example 4 21 25.0±6.4 80

As shown in Table 2, Examples 1 to 7 had excellent adhesion in the aqueous phase, and it was confirmed that 90% or more of the products maintained adhesion without peeling.

Specifically, Examples 1 and 2 showed excellent adhesiveness and peel strength, but the uniformity of application to the substrate was very low as a large number of filaments were formed when the hot melt adhesive composition was sprayed, and the produced disposable pure cotton product had an unusual odor. has occurred.

In addition, Examples 3 to 7 showed remarkably excellent adhesion in the water phase, and at the same time, both peel strength and application uniformity were excellent.

On the other hand, in Comparative Examples 1 to 4, the peeling of the pure cotton sheet occurred easily in the aqueous phase, and the disposable cotton product was damaged. Specifically, it was confirmed that more than 75% of the products lost adhesiveness and were peeled off.

Claims (14)

an olefin-based resin comprising a propylene repeating unit having a melting point of 70 to 120°C; hydrogenated styrenic block copolymer; And a hot-melt adhesive composition for pure surface adhesion comprising a hydrocarbon-based adhesive resin,
The weight ratio of the olefin-based resin and the hydrogenated styrene-based block copolymer is 1:1 to 5,
The hot melt adhesive composition has an Upper Critical Solution Temperature (UCST) in a temperature range of 60 to 90° C., and maintains adhesive strength even in contact with water. According to claim 1,
The hot-melt adhesive composition for bonding the pure surface comprises 1 to 20% by weight of an olefin-based resin, 5 to 40% by weight of a hydrogenated styrenic block copolymer, and 40 to 80% by weight of a hydrocarbon-based adhesive resin. According to claim 1,
The olefin-based resin has a propylene repeating unit content of 50 to 95 mol% of a hot-melt adhesive composition for bonding pure cotton. delete According to claim 1,
The hydrogenated styrene-based block copolymer is a styrene-ethylene-butylene-styrene block copolymer (SEBS), a styrene-ethylene-propylene-styrene block copolymer (SEPS), a styrene-ethylene-propylene block copolymer (SEP), and styrene -Ethylene-ethylene-propylene-styrene block copolymer (SEEPS) and styrene-butylene-butadiene-styrene block copolymer (SBBS) A hot-melt adhesive composition for bonding a pure surface which is any one or a mixture of two or more. According to claim 1,
The hydrocarbon-based adhesive resin is a hydrogenated hydrocarbon-based adhesive resin, a hot-melt adhesive composition for bonding pure surface. According to claim 1,
The hot-melt adhesive composition for bonding pure cotton has a softening point of 130° C. or less. According to claim 1,
The hot-melt adhesive composition for bonding pure cotton further comprises any one or a mixture of two or more selected from lubricants, waxes, plasticizers and antioxidants. the first substrate; second base; and a hot-melt adhesive composition formed on the interface between the first and second substrates, wherein the hot-melt adhesive composition is selected from claims 1 to 3 and 5 to 8. A disposable product that is a hot melt adhesive composition for 10. The method of claim 9,
wherein said disposable product is selected from diapers, adult incontinence products, feminine hygiene products and medical bandages. 10. The method of claim 9,
Disposable products wherein at least one of the first and second substrates is pure cotton fiber. heating a hot-melt adhesive composition comprising an olefin-based resin including a propylene repeating unit having a melting point of 70 to 120°C, a hydrogenated styrene-based block copolymer, and a hydrocarbon-based adhesive resin;
applying the heated hot melt adhesive composition to a first substrate; and
laminating a second substrate on the first substrate to which the hot-melt adhesive composition is applied and bonding the second substrate by thermocompression bonding;
A method of manufacturing a disposable product comprising a. 13. The method of claim 12,
The step of applying the hot melt adhesive composition is a method of manufacturing a disposable product that is performed at 80 to 150 ℃. 13. The method of claim 12,
The disposable product is a method of manufacturing a disposable product comprising a cotton fiber.