Hard surface cleaner

Abstract

[Problem] To provide a hard surface cleaner that has appropriate friction coefficient and quick-drying property, has such sufficient strength as not to be easily torn even in a state of containing a large amount of chemical solution, and maintains a moderate softness even in a dry state due to evaporation of the chemical solution. [Solution] A hard surface cleaner according to the present disclosure, which is obtained by impregnating a nonwoven fabric with a chemical solution containing alcohol having at least 4 carbon atoms, is characterized in that the nonwoven fabric is a laminated nonwoven fabric including an inner layer and outer layers provided on both surfaces of the inner layer, the inner layer containing pulp, wherein: the content of the pulp is 40-60 wt% of the total weight of the laminated nonwoven fabric; the outer layer contains cellulose fiber A other than pulp and having a fiber diameter of 2-12 μm and cellulose fiber B other than pulp and having a fiber diameter of more than 12 μm but 30 μm or less; the content of the cellulose fiber A is 10-30 wt% of the total weight of the laminated nonwoven fabric; and the content of the alcohols is 8-60 wt% of the total weight of the hard surface cleaner.

Description

Hard Surface Cleaner

[0001] The present disclosure relates to a hard surface cleaner in which a chemical solution is impregnated into a laminated nonwoven fabric, and which is used to wipe hard objects such as eyeglasses.

[0002] 2. Description of the Related Art Cleaners that are used to wipe hard objects such as eyeglasses include those in which a chemical solution is impregnated into a nonwoven fabric.

[0003] For example, Patent Document 1 discloses an eyeglass cleaner in which a base sheet is impregnated with a chemical solution, and the base sheet is formed of a rectangular nonwoven fabric and has a basis weight of 18 g / m 2 to 35 g / m 2 The eyeglass cleaner is characterized in that it is made up of three or more layers including outer layers arranged on the front and back surfaces and inner layers arranged between the outer layers, the outer layers having a superior ability to scrape off dirt compared to the inner layers, and the inner layers having a superior ability to retain chemical solutions compared to the outer layers, and a plurality of holes penetrating the base sheet are formed.

[0004] Japanese Patent Application Laid-Open No. 2019-128530

[0005] However, conventional hard surface cleaners have the problem that they tend to tear easily due to insufficient strength when they contain a large amount of chemical solution, and when the chemical solution evaporates and the surface dries, the nonwoven fabric becomes hard, making it more susceptible to scratches on the surface of hard objects.

[0006] The object of the present disclosure is to provide a hard surface cleaner that has an appropriate coefficient of friction and quick drying properties, is strong enough to resist tearing even when it is saturated with a large amount of chemical solution, and remains moderately soft even when the chemical solution evaporates and the cleaner dries.

[0007] The present inventors have conducted extensive research to solve the above-mentioned problems and have found that by using a laminated nonwoven fabric including an inner layer made of pulp and outer layers provided on both sides of the inner layer, adjusting the pulp content to a specific amount, adding a specific amount of small-diameter cellulose fibers other than pulp to the outer layer, and further adding a specific amount of alcohol having 4 or fewer carbon atoms to the laminated nonwoven fabric, it is possible to obtain a hard surface cleaner that has an appropriate coefficient of friction and quick-drying properties, is strong enough to resist tearing even when it is saturated with a large amount of chemical solution, and remains appropriately soft even when the chemical solution has evaporated and dried. The present disclosure was completed based on these findings and through further research.

[0008] That is, the present disclosure provides the following aspects of the invention. Item 1. A hard surface cleaner in which a chemical solution containing an alcohol having 4 or less carbon atoms is impregnated into a nonwoven fabric, wherein the nonwoven fabric is a laminated nonwoven fabric including an inner layer and outer layers provided on both sides of the inner layer, wherein the inner layer contains pulp, and the pulp content is 40 to 60 wt % relative to the total weight of the laminated nonwoven fabric, and the outer layer contains cellulose fiber A other than pulp and having a fiber diameter of 2 to 12 μm, and cellulose fiber B other than pulp and having a fiber diameter greater than 12 μm and 30 μm or less, wherein the content of the cellulose fiber A is 10 to 30 wt % relative to the total weight of the laminated nonwoven fabric, and the alcohol content is 8 to 60 wt % relative to the total weight of the hard surface cleaner. Item 2. The hard surface cleaner according to Item 1, wherein the laminated nonwoven fabric does not contain synthetic fibers. Item 3. Item 4. The hard surface cleaner according to any one of Items 1 to 3, wherein the alcohol is at least one selected from the group consisting of ethanol and isopropyl alcohol. Item 5. The hard surface cleaner according to any one of Items 1 to 3, wherein the hard surface cleaner is a cleaner for eyeglasses. Item 6. Use of a cleaner for wiping a hard surface, comprising: a nonwoven fabric impregnated with a chemical solution containing an alcohol having four or fewer carbon atoms; the nonwoven fabric being a laminated nonwoven fabric including an inner layer and outer layers provided on both sides of the inner layer; the inner layer containing pulp; and a pulp content of 40 to 60 wt% based on the total weight of the laminated nonwoven fabric; the outer layer containing cellulose fiber A other than pulp and having a fiber diameter of 2 to 12 μm, and cellulose fiber B other than pulp and having a fiber diameter greater than 12 μm and equal to or less than 30 μm; the cellulose fiber A content of 10 to 30 wt% based on the total weight of the laminated nonwoven fabric; and the alcohol content of 8 to 60 wt% based on the total weight of the cleaner. Item 6. The use according to item 5, wherein the hard surface is the surface of a spectacle lens.Item 7. A wiping method comprising wiping a hard surface with a cleaner comprising: a nonwoven fabric impregnated with a chemical solution containing an alcohol having 4 or less carbon atoms; the nonwoven fabric being a laminated nonwoven fabric including an inner layer and outer layers provided on both sides of the inner layer; the inner layer containing pulp; and a pulp content of 40 to 60 wt % relative to the total weight of the laminated nonwoven fabric; the outer layer containing cellulose fibers A other than pulp and having a fiber diameter of 2 to 12 μm; and cellulose fibers B other than pulp and having a fiber diameter greater than 12 μm and 30 μm or less; the cellulose fibers A content of 10 to 30 wt % relative to the total weight of the laminated nonwoven fabric; and an alcohol content of 8 to 60 wt % relative to the total weight of the cleaner. Item 8. The wiping method according to Item 7, wherein the hard surface is the surface of an eyeglass lens. Item 9. Item 10. A use of a laminated nonwoven fabric, comprising: a chemical solution containing an alcohol having 4 or less carbon atoms for producing a hard surface cleaner; and an inner layer and outer layers provided on both sides of the inner layer, wherein the inner layer contains pulp, and the pulp content is 40 to 60 wt % based on the total weight of the laminated nonwoven fabric, and the outer layer contains cellulose fiber A other than pulp and having a fiber diameter of 2 to 12 μm, and cellulose fiber B other than pulp and having a fiber diameter of more than 12 μm and 30 μm or less, and the content of the cellulose fiber A is 10 to 30 wt % based on the total weight of the laminated nonwoven fabric. Item 10. The use according to Item 9, wherein the hard surface is the surface of an eyeglass lens.

[0009] The hard surface cleaner of the present disclosure has a moderate coefficient of friction and quick drying properties, is strong enough to resist tearing even when it is saturated with a large amount of chemical solution, and remains moderately soft even when the chemical solution evaporates and the cleaner dries, providing a comfortable wiping experience and preventing scratches on the surface of hard objects.The hard surface cleaner of the present disclosure also has excellent removal properties for dirt (especially pollen) adhering to hard objects such as eyeglasses.

[0010] 1. Definitions In the present disclosure, the notation "X to Y" regarding a numerical range indicates a numerical range of not less than X and not more than Y.

[0011] In the present disclosure, a hard surface refers to the surface of a hard object such as resin, metal, ceramic, glass, and wood.

[0012] 2. Hard Surface Cleaner The hard surface cleaner of the present disclosure is a nonwoven fabric impregnated with a chemical solution containing an alcohol having 4 or less carbon atoms, the nonwoven fabric being a laminated nonwoven fabric including an inner layer and outer layers provided on both sides of the inner layer, the inner layer containing pulp, the pulp content being 40 to 60 wt % based on the total weight of the laminated nonwoven fabric, the outer layer containing cellulose fiber A other than pulp and having a fiber diameter of 2 to 12 μm, and cellulose fiber B other than pulp and having a fiber diameter greater than 12 μm and 30 μm or less, the cellulose fiber A content being 10 to 30 wt % based on the total weight of the laminated nonwoven fabric, and the alcohol content being 8 to 60 wt % based on the total weight of the hard surface cleaner. The hard surface cleaner of the present disclosure is described in detail below.

[0013] [Laminated Nonwoven Fabric] The laminated nonwoven fabric of the present disclosure includes an inner layer and outer layers provided on both sides of the inner layer. The laminated nonwoven fabric of the present disclosure will be described in detail below.

[0014] (Inner Layer) The inner layer is a fiber layer containing pulp as a raw fiber. By using pulp as a raw fiber for the inner layer, the chemical solution retention ability of the laminated nonwoven fabric can be improved. Furthermore, pulp is easily entangled with the cellulose fibers used in the outer layer when manufacturing a laminated nonwoven fabric using a hydroentanglement method or the like. Therefore, by including pulp in the inner layer, the inner and outer layers are appropriately entangled, thereby increasing the strength of the laminated nonwoven fabric. Furthermore, pulp easily forms dense layers, thereby increasing the strength of the laminated nonwoven fabric. Furthermore, pulp is a plant-derived raw material, which can improve the biodegradability of the laminated nonwoven fabric. The high biodegradability of disposable laminated nonwoven fabrics contributes to the realization of a sustainable society and reduces environmental impact.

[0015] The pulp used as the raw fiber of the inner layer is not particularly limited, and examples thereof include mechanical pulp, recycled pulp, chemical pulp, etc. Furthermore, the pulp may be wood pulp or non-wood pulp.

[0016] The inner layer preferably contains only pulp as the raw fiber, but may also contain cellulose fibers other than pulp. The cellulose fibers other than pulp are not particularly limited, and examples thereof include: (1) natural fibers derived from plants such as cotton, flax, flax (linen), ramie, jute, banana, bamboo, kenaf, shell ginger, hemp, and kapok; (2) regenerated fibers such as rayon, polynosic, cupra, and lyocell; and (3) cellulose fibers obtained by melt spinning. The above-mentioned cellulose fibers may be used alone or in combination of two or more. When the raw fiber of the inner layer is pulp and cellulose fibers other than pulp, the content of the cellulose fibers other than pulp is usually 40% by weight or less, preferably 30% by weight or less, more preferably 20% by weight or less, and even more preferably 5% by weight or less, based on the total weight of the raw fiber of the inner layer.

[0017] The fiber diameter of the pulp constituting the inner layer and the optional cellulose fibers other than pulp is usually about 2 to 50 μm, and from the viewpoint of excellent chemical solution retention and achieving both appropriate strength and softness of the inner layer, it is preferably 20 to 40 μm. In the present disclosure, the fiber diameter of the pulp constituting the inner layer or the optional cellulose fibers other than pulp is the average value of the diameter of single fibers at 100 random locations when the surface of the inner layer of a sample of the hard surface cleaner dried at 25°C for 24 hours is observed at 200x magnification using a scanning electron microscope (SEM).

[0018] The inner layer preferably does not contain synthetic fibers to improve the biodegradability of the laminated nonwoven fabric and to provide a natural hard surface cleaner that reduces environmental impact.

[0019] The basis weight of the inner layer is not particularly limited, but is usually 5 to 50 g / m 2 From the viewpoint of excellent retention of the drug solution, of achieving both appropriate strength and softness of the inner layer, and of further entangling the fibers between the inner layer and the outer layer to enhance integration of the inner layer and the outer layer, the density is preferably 10 to 50 g / m 2 , more preferably 10 to 30 g / m 2 is.

[0020] (Outer Layer) The outer layer is a fiber layer provided on both the front and back sides of the inner layer, is positioned outside the laminated nonwoven fabric, and serves as the surface that comes into contact with the object to be wiped (for example, a hard object such as eyeglasses).

[0021] The outer layer contains non-pulp cellulose fibers A (hereinafter simply referred to as "cellulose fibers A") having a fiber diameter of 2 to 12 μm, and non-pulp cellulose fibers B (hereinafter simply referred to as "cellulose fibers B") having a fiber diameter of more than 12 μm and no greater than 30 μm. Cellulose fibers are plant-derived raw materials and can improve the biodegradability of the laminated nonwoven fabric. High biodegradability of disposable laminated nonwoven fabrics contributes to the realization of a sustainable society and reduces environmental impact. Cellulose fibers also have the advantage of having a moderate coefficient of friction, making them less likely to scratch the surface of hard objects and providing a good wiping experience. Cellulose fibers also have the advantage of being able to effectively wipe away particle (particularly pollen) stains. The outer layer does not contain pulp. Using pulp in the outer layer is undesirable because it can easily cause fiber powder (paper powder) to adhere to the object being wiped.

[0022] The cellulose fibers A and B are not particularly limited, and examples thereof include: (1) natural fibers derived from plants such as cotton, flax, flax (linen), ramie, jute, banana, bamboo, kenaf, shell ginger, hemp, and kapok; (2) regenerated fibers such as rayon, polynosic, cupra, and lyocell; and (3) cellulose fibers obtained by melt spinning. The above-exemplified cellulose fibers may be used alone or in combination of two or more.

[0023] The fiber diameter of the cellulose fiber A is 2 to 12 μm. By using cellulose fiber A having a fiber diameter of 2 to 12 μm as the fiber constituting the outer layer, the fiber density of the outer layer is improved, and a laminated nonwoven fabric that is resistant to tearing even when a large amount of chemical solution is absorbed is obtained. From the viewpoint of further improving the effects of the present disclosure, the fiber diameter of the cellulose fiber A is preferably 3 to 12 μm, more preferably 5 to 12 μm. In the present disclosure, the fiber diameter of the cellulose fiber A constituting the outer layer is the average value of the diameters of single fibers at 100 random locations when the outer layer surface of a sample of a hard surface cleaner dried at 25°C for 24 hours is observed at 200x magnification using a scanning electron microscope (SEM). Note that cellulose fiber A and cellulose fiber B have different cross-sectional shapes, and therefore cellulose fiber A can be distinguished by the cross-sectional shape.

[0024] The fiber diameter of cellulose fiber B is greater than 12 μm and less than 30 μm. By using cellulose fiber B having a fiber diameter greater than 12 μm and less than 30 μm together with cellulose fiber A as the fibers constituting the outer layer, the fiber density of the outer layer is prevented from becoming too high, and a laminated nonwoven fabric is obtained that remains moderately soft even after the chemical solution evaporates and dries, thereby providing a comfortable wiping experience and less likely to scratch the surface of hard objects. From the perspective of further improving the effects of the present disclosure, the fiber diameter of cellulose fiber B is preferably 12.5 to 25 μm, more preferably 12.5 to 20 μm. In the present disclosure, the fiber diameter of cellulose fiber B constituting the outer layer refers to the average diameter of single fibers at 100 random locations when the outer layer surface of a sample dried with a hard surface cleaner at 25°C for 24 hours is observed at 200x magnification using a scanning electron microscope (SEM). Since cellulose fiber A and cellulose fiber B have different cross-sectional shapes, cellulose fiber B can be distinguished by their cross-sectional shapes.

[0025] In the outer layer, the content ratio of cellulose fiber A to cellulose fiber B is not particularly limited, but the content of cellulose fiber A per 100 parts by weight of the total amount of cellulose fiber A and cellulose fiber B is usually about 10 to 90 parts by weight.From the viewpoint of setting the fiber density of the outer layer within a more suitable range and obtaining a laminated nonwoven fabric that is less likely to tear even when it contains a large amount of chemical solution, is appropriately soft even when the chemical solution has evaporated and it has dried, and therefore is comfortable to wipe and less likely to scratch the surface of a hard object, the content of cellulose fiber A is preferably 15 to 85 parts by weight, more preferably 20 to 80 parts by weight, even more preferably 20 to 75 parts by weight, even more preferably 20 to 70 parts by weight, and particularly preferably 20 to 60 parts by weight.

[0026] The outer layer preferably does not contain synthetic fibers in order to improve the biodegradability of the laminated nonwoven fabric and to provide a hard surface cleaner made from natural materials that reduces the environmental impact.Furthermore, if the outer layer contains synthetic fibers, the coefficient of friction of the outer layer decreases, which is undesirable because it makes the surface slippery during wiping, resulting in a poor feel when used, and also because it reduces the wiping effect of particles (especially pollen) stains.

[0027] The weight of the outer layer is not particularly limited, but is usually 5 to 50 g / m 2 The density is preferably about 10 to 50 g / m from the viewpoint of obtaining a laminated nonwoven fabric that is hard to tear even when it contains a large amount of chemical solution and is soft even when it is in a dry state after the chemical solution has evaporated, and from the viewpoint of further entangling the fibers between the inner layer and the outer layer to enhance integration of the inner layer and the outer layer. 2 , more preferably 10 to 30 g / m 2 is.

[0028] The outer layer provided on one side of the inner layer and the outer layer provided on the other side of the inner layer may be fiber layers having the same raw fiber, content ratio of cellulose fiber A and cellulose fiber B, and basis weight, etc., or may be fiber layers having different raw fiber fibers.

[0029] (Characteristics of the Laminated Nonwoven Fabric) In the laminated nonwoven fabric, the content of the pulp constituting the inner layer is 40 to 60 wt %, and preferably 45 to 60 wt %, based on the total weight of the laminated nonwoven fabric, in order to obtain a laminated nonwoven fabric that has excellent chemical solution retention, moderate quick-drying properties, and is both moderate in strength and softness.

[0030] In the laminated nonwoven fabric, the content of cellulose fiber A constituting the outer layer is 10 to 30% by weight, preferably 15 to 25% by weight, based on the total weight of the laminated nonwoven fabric in order to obtain a laminated nonwoven fabric that is difficult to tear even when it contains a large amount of chemical solution, and that remains moderately soft even when the chemical solution evaporates and becomes dry, thereby providing a comfortable wiping experience and not easily damaging the surface of hard objects.

[0031] In the laminated nonwoven fabric, the content ratio of the cellulose fiber A constituting the outer layer to the pulp constituting the inner layer is not particularly limited, but the content of the cellulose fiber A constituting the outer layer per 100 parts by weight of the pulp constituting the inner layer is usually about 10 to 80 parts by weight, and is preferably 15 to 70 parts by weight, more preferably 20 to 60 parts by weight, from the viewpoint of obtaining a laminated nonwoven fabric that is difficult to tear even when it contains a large amount of chemical solution, that is moderately soft even when the chemical solution has evaporated and it has dried, and that therefore has a good wiping feel and is unlikely to scratch the surface of hard objects.

[0032] In the laminated nonwoven fabric, the ratio of the basis weight of the inner layer to the outer layer is not particularly limited and is usually 5:1 to 1:5 (inner layer:outer layer). From the viewpoint of obtaining a laminated nonwoven fabric that has excellent chemical solution retention, moderate quick-drying properties, and combines moderate strength and softness, and from the viewpoint of obtaining a laminated nonwoven fabric that is difficult to tear even when it contains a large amount of chemical solution and that is moderately soft even when the chemical solution has evaporated and it has dried, thereby providing a comfortable wiping experience and is unlikely to scratch the surface of hard objects, the ratio is preferably 3:1 to 1:3, and more preferably 3:2 to 2:3.

[0033] The laminated nonwoven fabric includes at least the inner layer and outer layers provided on both sides of the inner layer, and may further include one or more optional fiber layers laminated at any positions within a range that does not impair the effects of the present disclosure. However, the laminated nonwoven fabric of the present disclosure preferably has a three-layer structure consisting of the inner layer and outer layers provided on both sides of the inner layer.

[0034] (Method for manufacturing laminated nonwoven fabric) The manufacturing method of the laminated nonwoven fabric of the present disclosure is not particularly limited, and can be manufactured by known methods, for example, by laminating outer layer fiber webs on both sides of an inner layer fiber web to obtain a laminate sheet and integrating them by entanglement treatment such as hydroentanglement (spunlace) and needle punching. Each fiber web before being laminated may be a nonwoven fabric or a precursor of a nonwoven fabric. A precursor of a nonwoven fabric is a fiber sheet, web, or batt in which fibers are oriented unidirectionally or randomly but are not bonded to each other. The manufacturing method of each fiber web before being laminated is also not particularly limited. Each fiber web used to manufacture the laminated nonwoven fabric may be a precursor of a nonwoven fabric manufactured by a carded method, an airlaid method, a wet method, or the like, or may be a nonwoven fabric manufactured by a hydroentanglement (spunlace) method, a needle punching method, a wet method, or the like.

[0035] [Chemical Solution] The chemical solution to be impregnated into the laminated nonwoven fabric of the present disclosure contains an alcohol having a carbon number of 4 or less. The chemical solution of the present disclosure will be described in detail below.

[0036] (Alcohol) The medicinal solution of the present disclosure contains an alcohol having at least 4 carbon atoms or less. Examples of the alcohol include monohydric and dihydric alcohols.

[0037] Examples of monohydric alcohols having 4 or less carbon atoms include methanol, ethanol, 1-propanol, isopropyl alcohol (2-propanol), 1-butanol, 2-butanol, isobutanol, and t-butanol.

[0038] Examples of dihydric lower alcohols having 4 or less carbon atoms include glycols such as ethylene glycol, propylene glycol, diethylene glycol, 1,2-butanediol, 1,3-butanediol, and 1,4-butanediol.

[0039] In the chemical solution of the present disclosure, the alcohol having 4 or less carbon atoms may be used alone or in combination of two or more.

[0040] Of the alcohols exemplified above, from the viewpoint of superior cleaning power and wiping ability, a monohydric alcohol having 4 or less carbon atoms is preferred, more preferably at least one selected from the group consisting of ethanol and isopropyl alcohol, and from the viewpoint of being less volatile, isopropyl alcohol is even more preferred.

[0041] In the chemical solution of the present disclosure, the content of the alcohol having 4 or less carbon atoms is not particularly limited, but is usually 50 to 100% by weight, and from the viewpoint of removability of dirt attached to hard objects, it is preferably 60 to 95% by weight, more preferably 65 to 90% by weight, and even more preferably 70 to 90% by weight.

[0042] (Other Components) The chemical solution of the present disclosure may further contain water. The type of water contained in the chemical solution is not particularly limited, but water with few impurities is preferred, and examples thereof include ultrapure water, pure water, distilled water, and ion-exchanged water.

[0043] Furthermore, the medicinal solution of the present disclosure may contain other additives in addition to the alcohol having 4 or less carbon atoms and water. Examples of other components include fragrances, surfactants, cooling agents, preservatives, disinfectants, thickeners, pH adjusters, and ultraviolet absorbers. One or more of the above-mentioned exemplary additives may be contained.

[0044] (Method for Producing Chemical Solution) When the chemical solution of the present disclosure is a mixture, the chemical solution of the present disclosure can be prepared, for example, by mixing an alcohol having 4 or less carbon atoms, water, and the other components. The mixing method is not particularly limited as long as it is a method that allows the components to be mixed so as to dissolve and become uniform, and any known mixing method can be used.

[0045] [Characteristics of the Hard Surface Cleaner] In the hard surface cleaner of the present disclosure, the content of the alcohol having 4 or less carbon atoms is 8 to 60 wt % based on the total weight of the hard surface cleaner. By adjusting the content of the alcohol having 4 or less carbon atoms within this range, it is possible to obtain a hard surface cleaner that has excellent cleaning power for stains attached to hard objects, has moderate quick-drying properties, and can be used repeatedly. From the perspective of obtaining a hard surface cleaner that has excellent cleaning power for stains attached to hard objects, is resistant to drying, and can be used repeatedly, the content of the alcohol having 4 or less carbon atoms is preferably 10 to 50 wt %, more preferably 15 to 40 wt %, and even more preferably 15 to 30 wt % based on the total weight of the hard surface cleaner.

[0046] [Method for Manufacturing a Hard Surface Cleaner] The hard surface cleaner of the present disclosure can be manufactured by impregnating the laminated nonwoven fabric with the chemical solution. The method for impregnating the laminated nonwoven fabric with the chemical solution is not particularly limited, and examples thereof include known methods such as immersing the laminated nonwoven fabric in the chemical solution and spraying or applying the chemical solution to the laminated nonwoven fabric.

[0047] [Uses of Hard Surface Cleaner] The hard surface cleaner of the present disclosure can be used as a cleaner for wiping the surfaces of various hard objects. Examples of hard objects include articles or components made of resin, metal, ceramics, glass, wood, etc., and specific examples include eyeglasses (especially eyeglass lenses), office equipment, furniture, home appliances, kitchen utensils, washbasins, window panes, toilets, automobiles, bicycles, etc. The hard surface cleaner of the present disclosure is particularly suitable for use as an eyeglass cleaner.

[0048] [Method of Use of Hard Surface Cleaner] The hard surface cleaner of the present disclosure can be used to effectively wipe away dirt such as sebum, grime, and dust adhering to the surface of a hard object by wiping the surface. Furthermore, the hard surface cleaner of the present disclosure can effectively wipe away not only dirt such as sebum, grime, and dust, but also pollen, which has been difficult to remove with conventional hard surface cleaners. Furthermore, the hard surface cleaner of the present disclosure is resistant to drying and can be used repeatedly. Furthermore, the hard surface cleaner of the present disclosure remains moderately soft even when dried, providing a comfortable wiping experience even when used in a dry state, is less likely to scratch the surface of a hard object, and can be used to wipe away dirt with ease even after drying.

[0049] The present disclosure will be explained in more detail below by showing examples, but the present disclosure is not limited to these examples.

[0050] Preparation Example 1 Chemical solution A was prepared by mixing 30 parts by weight of isopropyl alcohol (IPA) and 70 parts by weight of water.

[0051] Preparation Example 2 A chemical solution B was prepared by mixing 30 parts by weight of ethanol (EtOH) and 70 parts by weight of water.

[0052] Example 1 (1) Preparation of inner layer fiber web As the inner layer fiber web, a fiber web having a basis weight of 18 g / m 2 (2) Preparation of outer layer fiber web: 40% by weight of rayon and 60% by weight of lyocell were mixed and carded into a fiber web having a basis weight of 17 g / m using a parallel carding machine. 2 An outer layer fiber web was prepared so that the thickness of the outer layer fiber web was 1 / 3. (3) Preparation of Laminated Nonwoven Fabric The laminated sheets obtained by laminating outer layer fiber webs on both sides of the inner layer fiber web were integrated by hydroentanglement (spunlace) and dried to prepare a laminated nonwoven fabric. (4) Preparation of Hard Surface Cleaner The prepared chemical solution A was applied to the prepared laminated nonwoven fabric and impregnated into it to prepare a hard surface cleaner.

[0053] Examples 2 to 13 and Comparative Examples 1 to 12 Hard surface cleaners were prepared in the same manner as in Example 1, except that the type of fiber, the fiber ratio, the type of chemical solution, and the alcohol content were changed as shown in Tables 1 and 2.

[0054] Comparative Example 13: Weight per unit area: 35 g / m 2 The prepared chemical solution A was applied to a wet-laid nonwoven fabric made of pulp to prepare a hard surface cleaner.

[0055] Measurement and Evaluation [Fiber Diameter] The hard surface cleaner was dried for 24 hours at 25°C, and a 10 cm x 10 cm sample was cut from the dried product. The sample was fixed to a stage with double-sided tape. The sample surface was observed at 200x magnification using a scanning electron microscope (SEM), and the diameter of each single fiber was measured at 100 random locations. The average value was taken as the fiber diameter.

[0056] [Tensile Test] A sample measuring 25 mm in width and 100 mm in length was cut from the prepared hard surface cleaner (impregnated with the chemical solution). The 25 mm wide side of the sample was clamped in a tensile tester (Shimadzu Corporation, bench-top precision universal testing machine, AGS-X). A 20 N load cell was used. Measurement was started at a speed of 300 mm / min in the CD direction, and the maximum tensile strength was recorded. The test was performed five times, and the average of the maximum values ​​was calculated and evaluated according to the following criteria. The results are shown in Tables 1 and 2. (Evaluation criteria) ◯: 600 gf or more △: 300 gf or more but less than 500 gf ×: Less than 300 gf

[0057] [Detergency Test] The weight of a 3 cm x 15 cm x 5 mm polycarbonate plate was measured. 0.005 g of artificial sebum with the following composition was placed on the polycarbonate plate. The weight of the polycarbonate plate after the artificial sebum was placed on the plate was measured. Ten 100 mm x 130 mm hard surface cleaners (impregnated with chemical solution) were placed in a friction tester (Yasuda Seiki Seisakusho, No. 428 Color Fastness Rubbing Tester) (arm only: 200 g), and five reciprocating wipes were performed. The weight of the polycarbonate plate after wiping was measured, and the detergency (%) was calculated from the weights before and after wiping using the following formula. The test was performed three times, and the average value of detergency was calculated and evaluated according to the following criteria. The results are shown in Tables 1 and 2. Detergency (%) = [(weight of artificial sebum before washing - weight of artificial sebum remaining after washing) / weight of artificial sebum before washing] x 100 Composition of artificial sebum: triolein 15%, tristearin 15%, myristic acid 15%, oleic acid 15%, cholesterol 8%, cholesterol stearate 2%, paraffin wax 10%, squalene 10%, and Sudan III 10%. See "Study on Anionic Surfactants as Scalp and Hair Cleansers" Journal of the Oil Chemist's Society, Vol. 38, No. 4 (1989), Miyazawa Kiyoshi (Shiseido) (Evaluation criteria) 〇: 70% or more ×: Less than 70%

[0058] [Friction Coefficient Measurement] A 100 mm x 130 mm hard surface cleaner (impregnated with chemical solution) was clamped between a KES-SE friction tester manufactured by Kato Tech Co., Ltd., and the MIU (average coefficient of friction) obtained under the following measurement conditions was determined. The test was performed three times, and the average MIU value was calculated and evaluated according to the following criteria. If the MIU value is too small, the surface will be slippery during wiping, resulting in a poor wiping experience. If the MIU value is too large, the surface of the hard object will be easily scratched. The results are shown in Tables 1 and 2. (Measurement conditions) Friction element: fingerprint-type sensor Speed: 1.0 m / sec Load: 25 g (Evaluation criteria) ◯: 1.25 to 1.45 △: 1.2 or more but less than 1.25, 1.45 or more but less than 1.55 ×: Less than 1.2 (too small), 1.55 or more (too large)

[0059] [Evaluation of Paper Dust (Fiber Dust) After Wiping] Ten sheets of 100 mm x 130 mm hard surface cleaner (impregnated with chemical solution) were placed in a rub fastness tester (Yasuda Seiki Seisakusho, No. 428 Color Fastness Rubbing Tester) (arm only: 200 g), and the surface of a 3 cm x 15 cm x 5 mm polycarbonate plate was wiped back and forth five times. The visibility through the polycarbonate plate was then confirmed and evaluated according to the following criteria. The results are shown in Tables 1 and 2. (Evaluation Criteria) ◯: Paper dust (fiber dust) was not visible to the naked eye and visibility was not noticeable. Δ: Paper dust (fiber dust) was visible to the naked eye, but visibility was not noticeable. ×: Paper dust (fiber dust) was visible to the naked eye and visibility was noticeable.

[0060] [Quick Drying] A 100mm x 130mm sheet of hard surface cleaner (impregnated with the chemical solution) was placed on a digital scale, and its weight was measured every 30 seconds. Each measurement was carried out five times, and the average value of the weight was calculated. Then, the magnitude of the slope |a| from 0 to 4 minutes after the average value was calculated. In this case, the formula for the approximate value was R 2 It was confirmed that the drying rate was >95. The quick-drying property was evaluated according to the following criteria. The results are shown in Tables 1 and 2. If the drying rate of the hard surface cleaner is too slow, for example, when wiping eyeglass lenses, the chemical solution will remain on the eyeglass lenses for a long time, making it impossible to use the eyeglasses immediately, and it may also cause water stains to remain, which is undesirable. If the drying rate of the hard surface cleaner is too fast, it will not be possible to use it repeatedly, which is also undesirable. (Evaluation criteria) ◯: 0.025 to 0.035 △: 0.020 or more but less than 0.025 or more than 0.035 but less than 0.08 ×: 0 or more but less than 0.020 (too slow) or 0.08 or more (too fast)

[0061] [Pollen Capture Test] A 10 cm x 10 cm sample of hard surface cleaner, dried at 25°C for 24 hours, was attached to a special rubber tube (rubber tube for pilling test defined in JIS L 1076 7.1) in a polycarbonate box (internal dimensions: 220 mm x 220 mm) (attached in accordance with JIS L 1076 8.1.1, with the seams sealed with adhesive tape). 0.05 g of artificial pollen (lycopodium) was placed in each sample. The box was then attached to a CI-type pilling tester and operated at 60 rpm for 20 minutes. The sample was then removed and measured using a microscope to determine the size of the sample. 2 The number of artificial pollen grains attached per sample was counted, and the total value for 10 locations was calculated. The pollen catching ability was then evaluated according to the following criteria. The results are shown in Tables 1 and 2. (Evaluation criteria) ◯: The number of artificial pollen grains caught was 2000 or more. △: The number of artificial pollen grains caught was 1000 or more but less than 2000. ×: The number of artificial pollen grains caught was less than 1000.

[0062] [Evaluation of softness in a state impregnated with chemical solution] A 100 mm x 130 mm sample of hard surface cleaner (impregnated with chemical solution) was used to wipe a lens (water-repellent coated lens, refractive index 1.60, manufactured by HOYA Corporation, "SL 982 VP") five times. The softness of the sample was then subjected to a sensory evaluation using a five-point scale (just right, slightly too soft, slightly too hard, too soft, too hard). The softness was then evaluated according to the following criteria. The results are shown in Tables 1 and 2. (Evaluation criteria) ◯: Just right △: Slightly too soft, slightly too hard ×: Too soft, too hard

[0063] [Evaluation of softness after drying] A sample of hard surface cleaner (impregnated with chemical solution) measuring 100 mm wide x 130 mm long was dried for 24 hours in an environment at 25°C. The entire dried sample was placed on a flat table. The sample was shifted so that 50 mm of the 100 mm width was outside the table, and the sample was fixed with a 5 N weight. Then, the distance from the surface of the table to the point where the sample sagged the most in the length direction was measured. The softness after drying was then evaluated according to the following criteria. The results are shown in Tables 1 and 2. (Evaluation criteria) ◯: 2.5 cm to 4.5 cm ×: 0 cm or more and less than 2.5 cm, more than 4.5 cm

[0064]

[0065]

[0066] The hard surface cleaners of Examples 1 to 13 fulfilled all of the features of the present disclosure, and therefore had sufficient strength to resist tearing even when impregnated with a chemical solution, excellent cleaning power, a moderate coefficient of friction and quick drying, were less likely to leave paper dust (fiber dust) after wiping, were excellent in pollen removal, and had a moderate softness. Furthermore, the hard surface cleaners of Examples 1 to 13 also had a moderate softness even when dry.

[0067] The hard surface cleaner of Comparative Example 1 contained 50 wt% cellulose fiber A and no cellulose fiber B relative to the total weight of the laminated nonwoven fabric, resulting in an excessively high coefficient of friction. The hard surface cleaner of Comparative Example 2 contained 35 wt% cellulose fiber A relative to the total weight of the laminated nonwoven fabric, resulting in an excessively high coefficient of friction. The hard surface cleaner of Comparative Example 3 contained 35 wt% pulp relative to the total weight of the laminated nonwoven fabric, resulting in low chemical retention, a too fast drying rate, and being too soft, clinging to fingers and making wiping difficult. The hard surface cleaner of Comparative Example 4 contained 6 wt% alcohol relative to the total weight of the hard surface cleaner, resulting in poor cleaning power, a too high coefficient of friction, and a too slow drying rate. The hard surface cleaner of Comparative Example 5 contained 65 wt% pulp relative to the total weight of the laminated nonwoven fabric, resulting in a large amount of paper dust adhering to the surface of the polycarbonate plate after wiping and a too slow drying rate. The hard surface cleaner of Comparative Example 6 contained 65 wt% alcohol relative to the total weight of the hard surface cleaner, resulting in a too low coefficient of friction and a too fast drying rate. The hard surface cleaners of Comparative Examples 7 to 9 contained either 5 wt% cellulose fiber A relative to the total weight of the laminated nonwoven fabric or no cellulose fiber A, resulting in insufficient strength, a large amount of paper dust adhering to the surface of the polycarbonate plate after wiping, and poor wiping ability for particulate soiling. The hard surface cleaners of Comparative Examples 10 to 12 contained synthetic fibers in the outer layer, resulting in a too low coefficient of friction and a slippery, uncomfortable wiping experience. The hard surface cleaner of Comparative Example 11 also had poor wiping ability for particulate soiling. The hard surface cleaner of Comparative Example 13 was made of 100% pulp, resulting in a poor overall evaluation.

Claims

1. A cleaner for hard surfaces in which a chemical solution containing an alcohol having 4 or less carbon atoms is impregnated into a nonwoven fabric, wherein the nonwoven fabric is a laminated nonwoven fabric including an inner layer and outer layers provided on both surfaces of the inner layer, the inner layer contains pulp, the content of the pulp is 40 to 60% by weight based on the total weight of the laminated nonwoven fabric, the outer layer contains cellulose fiber A other than pulp having a fiber diameter of 2 to 12 μm and cellulose fiber B other than pulp having a fiber diameter of more than 12 μm and 30 μm or less, the content of the cellulose fiber A is 10 to 30% by weight based on the total weight of the laminated nonwoven fabric, and the content of the alcohol is 8 to 60% by weight based on the total weight of the cleaner for hard surfaces.

2. The cleaner for hard surfaces according to claim 1, wherein the laminated nonwoven fabric does not contain synthetic fibers.

3. The cleaner for hard surfaces according to claim 1, wherein the alcohol is at least one selected from the group consisting of ethanol and isopropyl alcohol.

4. The cleaner for hard surfaces according to any one of claims 1 to 3, wherein the cleaner for hard surfaces is a cleaner for glasses.

Images