JP2019047902A - Wiping paper - Google Patents

Abstract

To provide wiping paper that enables both of water and oil to be sufficiently wiped, and furthermore is superior in texture.SOLUTION: The wiping paper is provided that is composed of synthetic paper. The synthetic paper includes polyolefin synthetic pulp (A) having a Canadian standard freeness of 100 mL or more and 520 mL or less, binder fibers (B), and natural pulp (C) having a fiber length of 1 mm or more and 80 mm or less, and the content of the polyolefin synthetic pulp (A) to the total mass of the synthetic paper is 20 mass% or more.SELECTED DRAWING: None

Description

  The present invention relates to wiping paper.

Dust paper and tissue paper made from natural pulp have long been used as paper for removing dirt (hereinafter, also referred to as "wipe paper"). In addition, as a wiping paper for fats and oils on the face, a sheet of oil blotting paper made from wood pulp and plant fibers, in particular, hemp fibers, is used. In particular, gilt-stamped paper is used as a blotting paper used at the time of facial makeup.
Most dust paper, tissue paper and blotting paper use wiping paper alone and do not contain chemicals such as alcohol. On the other hand, wet tissue is used as a wiping paper containing chemicals such as alcohol to make it easy to remove oil stains. These are already well known from many documents and various ones are commercially available.

  For example, Patent Document 1 prepares a stock comprising 5 to 50 parts by weight of an inorganic filler blended with 100 parts by weight of a pulp raw material containing plant fibers as a main component, as a blotting paper excellent in sebum absorbability. There is described a cosmetic oil removing paper characterized in that the tightness of the paper obtained by papermaking is 0.7 or more.

  For example, Patent Document 2 describes a fat removing paper in which a laminated film in which a polypropylene (PP) film and a polyethylene (PE) film are alternately laminated is stretched and made porous as a blotting paper excellent in sebum absorbability. There is.

  In addition, as a paper from which both sebum and sweat can be wiped off, for example, Patent Document 3 proposes a wiping sheet provided with a coating layer containing a wax emulsion, cobalt thiocyanate, an extender pigment, and a binder on a fiber support ing.

JP-A-6-319664 JP, 2007-90063, A Japanese Patent Laid-Open No. 2000-175739

  Dust paper and tissue paper made from general natural pulp can wipe off water well, but oil is difficult to wipe off. Oil blotting paper made from hemp fiber can wipe oil well, but sweat and other moisture are difficult to wipe off.

  In addition, the wet tissue impregnated with alcohol can wipe off the oil well, but the moisture is difficult to wipe off. Not only that, there is a problem that wet tissues may cause hand roughening due to chemicals, and there is a problem that it becomes difficult to wipe off both water and oil if they are dried during storage.

  More specifically, when the inventors examined it more specifically, the oil blotting paper described in Patent Document 1, for example, is considered to be excellent in oil absorbability, but is not sufficient and is also poor in water absorbability. There was a problem that sweat and other water could not be removed sufficiently.

  Similarly, the oil blotting paper described in Patent Document 2 has a problem in that it can not wipe off moisture such as sweat sufficiently because it is inferior in water absorbability.

  Moreover, when the present inventors examined, the wiping off sheet | seat which provided the coating layer which contains a wax emulsion, cobalt thiocyanate, an extender, and a binder in the fiber support body which absorbs water and oil of patent document 3 is provided. In addition to the complicated process of coating, there is a problem that the absorption amounts of water and oil may not be sufficient.

  Thus, no paper is known which can wipe both water and oil sufficiently.

  In addition, since the wiping paper is often used in contact with human skin, it is required to be excellent in texture.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a wiping paper which can wipe water and oil sufficiently and is also excellent in texture.

  As a result of intensive investigations, the present inventors have been able to wipe off water and oil sufficiently by combining specific synthetic pulp, binder fiber, and specific natural pulp, and also have excellent texture. It has been found that the present invention can be provided.

The present invention includes the following aspects.
<1> A wiping paper comprising synthetic paper, wherein the synthetic paper has a polyolefin-based synthetic pulp (A) having a Canadian Standard Freeness of 100 ml or more and 520 ml or less, a binder fiber (B), and a fiber length A wiping paper comprising natural pulp (C) having a size of 1 mm to 80 mm and having a content of the polyolefin-based synthetic pulp (A) of 20% by mass or more based on the total mass of the synthetic paper.
<2> The paper according to <1>, wherein the binder fiber (B) contains a fiber having a melting point of 70 ° C. or more and 130 ° C. or less.
<3> At least one selected from the group consisting of polyethylene fibers, low melting point polyester fibers, acrylic fibers, polyethylene / polypropylene composite fibers, polyethylene / polyethylene terephthalate composite fibers, and polyester composite fibers as the binder fiber (B) The wiping paper as described in <1> or <2> containing.
<4> Any one of <1> to <3>, wherein the synthetic paper further comprises particles (D) having an average particle diameter of 1 μm to 150 μm and a specific gravity of 1.5 to 10, Wipe paper described in Section.
<5> The particles (D) are at least selected from the group consisting of zeolite, apatite, calcium carbonate, titanium dioxide, silicon dioxide, barium sulfate, aluminum oxide, zirconium phosphate, calcium silicate, kaolin, talc, and copper oxide The wiping paper as described in <4> containing 1 type.
<6> The paper according to <4> or <5>, wherein the particles (D) include particles supporting silver ions.

  According to the present invention, it is possible to provide a wiping paper which can wipe off water and oil sufficiently and is also excellent in texture.

The numerical range shown by "-" in this specification means the numerical range containing the numerical value described before and after "-".
In the present specification, synthetic paper means paper produced by replacing 5% by mass or more of natural pulp with synthetic pulp in conventionally known paper whose main raw material is natural pulp.
In the present specification, the ability to wipe off oil is also referred to as "oil absorption", and the ability to wipe off water is also referred to as "water absorption".
In the present specification, “excellent oil absorption” means a value (oil adsorption amount) obtained by multiplying the ratio of the weight of synthetic paper after immersion in oil to the weight of synthetic paper before immersion in oil by 100. It means that it is 350% or more, and “excellent in water absorbency” is the value obtained by multiplying the weight ratio of synthetic paper after immersion in water to the weight of synthetic paper before immersion in water by 100 ( It says that water adsorption amount is 350% or more.
In the present specification, "texture" refers to the feel of the material felt when touched with a hand, and "excellent in texture" means close to the texture of paper formed from natural pulp.

<< Wipe paper >>
The paper of the present invention is a paper made of a specific synthetic paper. Hereinafter, specific synthetic paper will be described.

<Synthetic paper>
The specific synthetic paper in the present invention is a natural synthetic pulp having a fiber length of 1 mm to 80 mm and a polyolefin synthetic pulp (A) having a Canadian Standard Freeness of 100 ml or more and 520 ml or less, a binder fiber (B) C), and the content of the polyolefin-based synthetic pulp (A) is 20% by mass or more based on the total mass of the synthetic paper.

(Polyolefin-based synthetic pulp (A))
The polyolefin-based synthetic pulp (A) used in the present invention is a pulp comprising, as a main component, a homopolymer of an olefin or a copolymer of ethylene and another α-olefin. The carbon number of the polyolefin monomer or copolymer as the main component is preferably 2 to 10. Specific examples include synthetic pulp mainly composed of olefin homopolymers such as polyethylene and polypropylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-4-methylpentene-1 copolymer, etc. The synthetic pulp which has a copolymer as a main component is mentioned. Polyolefin-based synthetic pulp is suitably used as a raw material for synthetic paper because it is relatively inexpensive. Further, among the polyolefin-based synthetic pulps, a pulp comprising an ethylene-based resin, which is a copolymer of polyethylene homopolymer and ethylene and other monomers, is particularly preferably used.

  Specific examples of the polyolefin-based synthetic pulp include SWP (trade name) manufactured by Mitsui Chemicals, Inc., and the like.

The Canadian Standard Freeness (also referred to as Canadian Standard Freeness, CSF, or simply "freeness") of the polyolefin-based synthetic pulp (A) used in the present invention is 100 ml or more and 520 ml or less. The value of the Canadian standard freeness is a value measured according to JIS P 8121-2 (2012). From the viewpoint of further improving oil absorption and water absorption, the CSF of the polyolefin-based synthetic pulp (A) used in the present invention is preferably 150 ml or more and 480 ml or less, and more preferably 200 ml or more and 450 or less.
CSF can be adjusted, for example, by processing with a disc refiner.

The melt flow rate (MFR: g / 10 min, 190 ° C.) of the olefin resin as the main component of the polyolefin-based synthetic pulp (A) is 0.1 to 100 g / 10 min. Is preferably 1.0 to 60 g / 10 min. It is more preferable that
Moreover, it is preferable that it is 70-140 degreeC, and, as for melting | fusing point of the said olefin resin, it is more preferable that it is 90-140 degreeC.

The fiber length of the polyolefin-based synthetic pulp (A) is not particularly limited, but is usually 0.05 to 50 mm, and 0.05 to 10 mm from the viewpoint of bringing the texture of synthetic paper closer to paper formed from natural raw materials. Is preferred. The average fiber length is preferably in the range of 0.1 to 5 mm. In addition, the texture of synthetic paper is more excellent as it is closer to paper formed from natural raw materials.
The fiber length and the average fiber length can be adjusted, for example, by treatment with a disc refiner.

  The average fiber length can be determined by the following procedure.

The fibers constituting the polyolefin synthetic pulp are classified every 0.05 mm in length. Thereafter, the measured fiber length of the fibers contained in each class (length) and the number of fibers contained in each class are measured. The measurement may be performed on 12000 to 13000 fibers. Then, the number average fiber length Ln (mm) of each class is calculated | required by the following formula from said measurement result.
Ln = ΣL / N
L: Measured fiber length (mm) of fibers contained in one class
N: Number of fibers contained in one class

Thereafter, the average fiber length (mm) of the fibers constituting the synthetic pulp is determined by the following equation.
Average fiber length = Σ (Nn × Ln ³ ) // (Nn × Ln ² )
Nn: Number of fibers included in each grade

  In addition, the said measurement fiber length disperse | distributes a synthetic pulp in water so that it may become density | concentration 0.02 weight%, for example, and an automatic fiber measuring machine (product name: FiberLab-3.5) made by Metso Automation, Finland. It can be determined by measuring the length of each fiber constituting the synthetic pulp. In the measuring instrument, a fiber as it flows through the capillary is irradiated with a xenon lamp light, and a video signal is collected by a CCD (charge coupled device) sensor, and an image is analyzed.

  The melting point of the polyolefin-based synthetic pulp (A) is not particularly limited, but is preferably 70 ° C to 140 ° C, and more preferably 90 ° C to 140 ° C.

  There is no limitation in particular in the manufacturing method of polyolefin synthetic pulp (A), What was manufactured by the well-known method can be used. The production method is described, for example, in Encyclopedia of Chemical Technology 3rd ed, Vol. 19, P420-425, etc. Specifically, there may be mentioned a method in which a melt-spun fiber is cut into a short length and then beating, and a method in which a melting flash or an emulsion flash is carried out and then a refining treatment is carried out. In particular, a method of flash spinning a solution or emulsion of a resin composition is suitable. Among them, the emulsion flash method using polyvinyl alcohol (PVA) as a hydrophilizing agent is more preferable, and a pulp having a fiber shape suitable for producing paper can be obtained. The addition amount of PVA is preferably 0.01 to 10% by mass with respect to the total amount of synthetic pulp containing PVA.

  Furthermore, when manufacturing a polyolefin-type synthetic pulp (A), you may use various additives in the range which does not impair the objective of this invention other than a resin component. Examples of additives include flame retardants, antioxidants, antistatic agents, weathering stabilizers, pigments and the like.

The content of the polyolefin-based synthetic pulp (A) with respect to the total mass of the synthetic paper is 20% by mass or more, preferably 50% by mass or more, and more preferably 60% by mass or more from the viewpoint of further improving oil absorption.
Further, the content of the polyolefin-based synthetic pulp (A) with respect to the total mass of the synthetic paper is preferably 95% by mass or less, more preferably 90% by mass or less, and further preferably 85% by mass or less from the viewpoint of further improving water absorption. preferable.

(Binder fiber (B))
The binder fiber (B) used in the present invention is not particularly limited as long as it can be made into paper, and the tensile strength of the synthetic paper can be improved by blending in the synthetic paper. In addition, from the viewpoint of preventing a break in the drying process of synthetic paper, the binder fiber (B) preferably contains a fiber having a melting point of 70 ° C. or more and 130 ° C. or less, and a fiber having a melting point of 100 ° C. or more and 120 ° C. or less It is more preferable to include.

  Examples of such binder fibers (B) include synthetic fibers. Specific examples thereof include polyethylene fibers, low melting point polyester fibers, acrylic fibers, polyethylene / polypropylene composite fibers, polyethylene / polyethylene terephthalate composite fibers, polyester composite fibers and the like.

  The form of the binder fiber (B) may be short fiber or long fiber as long as it can be manufactured by a manufacturing facility. 0.1-20 mm is preferable and, as for the average fiber length of a binder fiber (B), 1-10 mm is more preferable. If the average fiber length is within this range, substantial sheeting of the composition containing the binder fiber (B) is possible, and a uniform synthetic paper can be obtained. Moreover, such binder fiber (B) is wettable.

  The average fiber length of the binder fiber (B) is a value measured in the same manner as the average fiber length of the polyolefin-based synthetic pulp (A).

  1 mass%-50 mass% are preferable, and, as for content of the binder fiber (B) with respect to the total mass of synthetic paper, 5 mass%-30 mass% are more preferable. By including the binder fiber (B) within this range, it is possible to prevent a break in the drying process of the synthetic paper, and it is possible to improve the tensile strength of the synthetic paper.

(Natural pulp (C))
The natural pulp (C) used in the present invention has a fiber length of 1 mm to 80 mm. When the synthetic paper contains natural pulp, the tensile strength, water absorbency and texture of the synthetic paper can be improved.

Natural pulps include, for example, wood pulps and non-wood pulps.
As wood pulp, for example, from softwood and hardwood, chemical pulping method represented by Kraft method, soda method and sulfite method, semi-chemical pulping method represented by neutral sulfite method, acid sulfite method And wood pulp manufactured by other known pulping methods.

Non-wood pulp is a pulp manufactured from raw materials other than wood. As raw materials other than wood, vegetable fiber is mentioned.
Examples of plant fibers include bast fibers consisting of manila hemp, flax, hemp, hemp, cane, honey, or birch, cotton, cotton cotton, cotton linters and the like, bamboo, bamboo, esparto, bagasse and the like. Non-wood pulp is manufactured from these vegetable fibers by various pulping methods, such as a chemical pulping method, a semichemical pulping method, a chemigrand pulping method, and a mechanical pulping method, for example. These vegetable fibers may be used alone or in combination of two or more. Among them, Manila hemp is preferable as the vegetable fiber from sebum absorbability, availability, supply amount and the like.

Among these, as natural pulp, softwood kraft pulp (NBKP) is preferable from the viewpoint of improving the embossing suitability.
Natural pulp (C) may contain only one type in synthetic paper, or may contain two or more types, but preferably contains only NBKP.

  The fiber length of natural pulp (C) is not limited as long as it can be produced by a production facility. The average fiber length of the natural pulp (C) is 1 mm to 80 mm, preferably 2 mm to 50 mm, from the viewpoint of securing a preferable strength as a wiping paper and from the viewpoint of obtaining a uniform synthetic paper.

  The average fiber length of the natural pulp (C) is a value measured in the same manner as the average fiber length of the polyolefin-based synthetic pulp (A).

In the present invention, the content of the natural pulp (C) contained in the synthetic paper is from the viewpoint of further improving the water absorption, from the viewpoint of further improving the texture, from the viewpoint of preventing paper breaking during the production of synthetic paper, and From a viewpoint of improving tensile strength, 1 mass% or more is preferable with respect to the total mass of synthetic paper, and 3 mass% or more is more preferable.
Moreover, from a viewpoint of improving oil absorption, 50 mass% or less is preferable, and, as for content of the natural pulp (C) contained in the synthetic paper in this invention, 30 mass% or less is more preferable.

(Particle (D))
The synthetic paper in the present invention preferably contains particles (D) having an average particle diameter of 1 μm to 150 μm and a specific gravity of 1.5 to 10, inclusive.
When the synthetic paper in the present invention contains the particles (D), oil absorption and water absorption tend to be further improved. Also, the texture tends to be closer to paper made of natural pulp.
In addition, as the particles (D), as long as the average particle diameter is in the above range, plural kinds of homogeneous particles having different particle diameters or different particles having different particle diameters may be used.

  The average particle diameter of the particles (D) is 1 μm or more and 150 μm or less, preferably 3 μm or more and 130 μm or less, more preferably 5 μm or more and 50 μm or less from the viewpoint of further improving oil absorption, water absorption and feeling.

  The average particle size of the particles (D) is a value measured by a laser diffraction type particle size measuring device. Specifically, SALD-2000J manufactured by Shimadzu Corp., Coulter Counter manufactured by Coulter Co., Microtrac particle size distribution analyzer manufactured by Nikkiso Co., Ltd. is preferably used as the particle diameter measuring apparatus, and SALD-2000J manufactured by Shimadzu Corp. is more preferably used. Be

The specific gravity (relative density) of the particles (D) is 1.5 or more and 10 or less, but is particularly preferably 2 or more and 6 or less when producing synthetic paper by a wet method.
In addition, the specific gravity (relative density) of the particles (D) is described in a catalog or a document (for example, Inorganic Chemistry Handbook (Technological Journal)).

  As the particles (D), inorganic particles are preferably used. Inorganic particles include, for example, zeolite, apatite, calcium carbonate, titanium dioxide, silicon dioxide, barium sulfate, aluminum oxide, zirconium phosphate, calcium silicate, kaolin, talc, and copper oxide. Those obtained by further organically modifying these inorganic particles are also included in the inorganic particles.

  Moreover, as a particle | grain (D), the particle | grain which carry | supported silver ion is preferably used from a viewpoint of providing an antimicrobial property to wiping paper. As particles carrying silver ions, inorganic particles carrying silver ions are preferable, and zeolite carrying silver ions is more preferable.

  When particles (D) are used, the content of the particles (D) relative to the total mass of the synthetic paper is the total mass of the synthetic paper from the viewpoint of further improving the water absorption and oil absorption and the texture of the synthetic paper. 0.5 mass% or more and 60 mass% or less are preferable, 1 mass% or more and 30 mass% or less are more preferable, and 2 mass% or more and 20 mass% or less are more preferable.

(Water-soluble polymer having hydroxyl group (E))
The synthetic paper in the present invention may further contain a water-soluble polymer (E) having a hydroxyl group for the purpose of preventing foaming in the paper making process and improving the feel (feel) of the wiping paper. Examples of such a water-soluble polymer include water-soluble cellulose represented by methyl cellulose, hydroxymethyl cellulose and hydroxyethyl cellulose, and polyvinyl alcohol. Among these, polyvinyl alcohol is preferable. Furthermore, as polyvinyl alcohol, polyvinyl alcohol whose saponification degree is 90% or more is preferable, and polyvinyl alcohol whose saponification degree is 98% or more is more preferable. Specific examples of polyvinyl alcohol include fully saponified type or semi-completely saponified type of GOOSENOR manufactured by Nippon Synthetic Chemical Co., Ltd., completely saponified type of J-Poval manufactured by Nippon SMM and Poval, and intermediate Ken. And the like.

  When a water-soluble polymer (E) having a hydroxyl group is used, the addition amount thereof is preferably 1% by mass to 100% by mass with respect to the total mass of the particles (D) contained in the synthetic paper. From the viewpoint of preventing foaming in the paper making process, 1% by mass or more and 50% by mass or less is more preferable, and from the viewpoint of the feel of the wiping paper, 50% by mass or more and 100% by mass is more preferable.

  When using a water-soluble polymer (E) having a hydroxyl group, the content of polyvinyl alcohol relative to the total mass of the synthetic paper is preferably 0.5 mass% or more and 60 mass% or less, more preferably 3 mass% or more and 20 mass% or less preferable.

(Additive)
The synthetic paper in the present invention may contain additives generally added to synthetic paper. Examples of such additives include dry paper strength agents, wet paper strength agents, retention improvers, coagulants, flocculants, dispersants, mold release agents, antifoam agents, and biocides.

(Characteristics of synthetic paper)
Texture of wiping paper, from the viewpoint of particularly improving more the appearance, the basis weight of the synthetic ^paper, preferably ^{70g / m 2 ~400g / m 2} . The synthetic paper may be a single layer paper, a multi-layered paper such as a laminated paper by bonding such as a laminated paper or a heat seal. In the case of multi-layer sheet had a basis weight of the surface layer is preferably from ^{70g / m 2 ~400g / m 2} . In view of the embossing deep grooves of basis weight is preferably from ^{150g / m 2 ~400g / m 2} .

  It is preferable that the Ohken method smoothness (value measured based on JISP 8155 (2010)) of the synthetic paper in this invention is 10 to 900 second. Furthermore, from the viewpoint of texture, the Oken smoothness of synthetic paper is preferably 10 to 100 seconds. Moreover, from a viewpoint of printability, 50 to 300 seconds are preferable, and more preferably 150 to 300 seconds. Furthermore, from the viewpoint of forming a film-like shape, 300 to 900 seconds are preferable.

(Manufacturing method of synthetic paper)
There is no limitation in particular in the manufacturing method of the synthetic paper in this invention, A well-known method can be used. For example, a dry method called air laid method or a wet method called paper making method may be mentioned. In addition, in order to give a feeling to synthetic paper, a wet system is preferable.

  For example, as a papermaking method performed in a laboratory, there is a method of preparing a handsheet according to JIS P 8222 (2015). Moreover, as a papermaking method in a laboratory, a dynamic papermaking method can also be used.

  From the viewpoint of environmental consideration, it is preferable to use a completely closed system papermaking method in which water in the papermaking process is not intentionally drained. In the laboratory, it can be verified by reusing paper white water a plurality of times, or by using pseudo white water which theoretically reproduces white water in a closed state. In papermaking in the laboratory, it is preferable to use pseudo white water.

  The drying temperature of the synthetic paper is preferably a temperature above the initial melting point of the binder fiber (B) to be used. Furthermore, from the viewpoint of further improving the texture, a temperature which is not lower than the initial melting point of the binder fiber (B) and not higher than the melting point of the polyolefin synthetic pulp (A) is preferable. Specifically, 70 ° C to 135 ° C is preferable.

  A heat treatment may be further performed to set the smoothness of the synthetic paper in the present invention to a desired value. The heat treatment can be performed using a drum dryer, an air through dryer, or the like. In addition, calendering may be performed while heat-treating using a heat-processable calendering machine. As temperature which implements heat processing, 95 ° C-165 ° C are preferred. Usually, the heat treatment is carried out at a temperature 10 ° C. to 55 ° C. higher than the drying temperature.

  There is no limitation in particular in the real machine installation for manufacturing the synthetic paper in this invention. For example, a combination of a paper machine such as a fourdrinier paper machine, a circular mesh paper machine, a circular mesh short mesh combination paper machine, an inclined wire paper machine, and a dryer such as a Yankee dryer, an air through dryer, or a drum dryer However, either method does not matter.

<Production method of wiping paper>
The method for producing the paper of the present invention is not particularly limited. The synthetic paper in the present invention can be used as it is or formed into a wiping paper.

<Uses of wipes>
The wiping paper of the present invention can be used as an application for wiping away dirt such as oil and water, for example, conventionally known wiping paper such as dust paper, tissue paper, kitchen paper, blotting paper, toilet paper, paper towel and the like.
In particular, since the wiping paper of the present invention is excellent in texture, water absorption and oil absorption, it is preferably used for applications requiring water absorption and oil absorption such as tissue paper, kitchen paper and oil blotting paper.

  EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to the following examples.

(Polyolefin-based synthetic pulp (A))
Synthetic pulps (A1) and (A2) were produced as polyolefin-based synthetic pulps (A) in the present invention as follows. Moreover, the synthetic pulp (a1) used as comparison as follows was prepared.

(Production of Synthetic Pulp (A1) and (A2))
N-hexane 20 liters (23 ° C.), water 20 liters (23 ° C.), melt flow rate (MFR; ASTM D1238, 190 ° C., 2.16 kg load) in a stirred autoclave of 80 liter container equipped with baffles 1,000 g of a polyethylene resin having a viscosity of 4.0, polyvinyl alcohol [PVA, degree of saponification 99%, 4% aqueous solution year (20 ° C.) 4.6 to 6.0 mPa · s, trade name GOOSENOL NL-05, Nippon Synthetic Chemical Co., Ltd. 30g manufactured by Kogyo Co., Ltd.]. The temperature of the mixture was raised to 145 ° C. while stirring at a rotational speed of 900 rpm. The mixture was then held at 145 ° C. and stirring was continued for another 30 minutes. Next, the suspension is flushed through a pipe having a diameter of 3 mm and a length of 20 mm attached to an autoclave through a pipe to a drum under a nitrogen atmosphere and a pressure of -400 mmHg to fibrillate the material. Obtained.

  The resulting fibrous material is further converted into a 3 g / liter aqueous slurry in a receiver, and then the fiber length and Canadian Standard Freeness (CSF) are adjusted using a disc refiner with a diameter of 12 inches, Synthetic pulps (A1) and (A2) were obtained. Physical properties of the produced synthesized pulp are shown in Table 1 below.

(Synthetic pulp a1)
A trade name SWP "E400" manufactured by Mitsui Chemicals, Inc. was used as the synthetic pulp (a1) to be compared. The physical properties of synthetic pulp a1 are also shown in Table 1 below.

(Binder fiber (B))
The following binder fibers were prepared as binder fibers (B).
B1: Daiwabo Polytech Co., Ltd. polypropylene / polyethylene core-sheath fiber (sheath melting point 100 ° C., fiber length 5 mm)

(Natural pulp (C))
The following natural pulps were prepared as natural pulp (C).
C1: Mitsui's packaging softwood kraft pulp (NBKP) (average fiber length 4 mm)
C2: Mitsui Hemp Pulp (Abaca Pulp) manufactured by Mitsui & Co., Ltd. (average fiber length 10 mm)

(Particle (D))
As particles (D), particles of a specific average particle size were used by adjusting commercially available particles as it is or by sieving. The average particle size was measured by SALD-2000J manufactured by Shimadzu Corporation. The average particle size in parentheses is the average particle size after sieving commercially available particles.
D1: Zeolite manufactured by Nitto Powdering Industry Co., Ltd. (trade name: Nitto Zeolite # 150) (average particle diameter 100 μm, specific gravity 2.1)
D2: Heavy calcium carbonate (trade name: NN # 200) manufactured by Nitto Kogyo Kogyo Co., Ltd. (average particle size 14.8 μm, specific gravity 2.7)
D3: Shinanenzeomic manufactured antimicrobial particle, trade name Zeomic LJ 210N (average particle diameter 40 μm, specific gravity 2.1, zeolite particle supporting silver ion)
The specific gravity of each of the particles is a catalog value published by the manufacturer.

(Water-soluble polymer having hydroxyl group (E))
The following water-soluble polymers having hydroxyl groups were prepared as water-soluble polymers (E) having hydroxyl groups. In addition, in use, polyvinyl alcohol was made into 2% of aqueous solution, and it mixed with particle | grains (D) and used it previously.
E1: Polyvinyl alcohol manufactured by Japan Synthetic Chemical Co., Ltd. (trade name: Gohsenol NL-05)

Example 1
75.5 mass% of synthetic pulp (A1), 9.5 mass% of binder fiber (B1), 4.5 mass% of natural pulp (C1), and 4 particles (D1) with respect to the total mass of the raw material .5% by mass, 1% by mass "trade name: DA4112" manufactured by Starlight PMC as a dry paper strength agent as an additive for internal addition, "trade name: WS4020" manufactured by Starlight PMC as a wet paper strength agent 1% by mass, 2% by mass "V-87E" manufactured by Meisei Chemical Industry Co., Ltd. as a dispersant, and 2% by mass "N.com" N. Tran. A hand-made paper with a basis weight of 350 g / m ² was produced using a laboratory square hand-made sheet machine. The produced hand-made paper was dried at a temperature of 110 ° C. using a rotary dryer, and further heat-treated at a temperature of 140 ° C. using a heat treatment apparatus to obtain a synthetic paper (P1).

<Examples 2 to 6, Comparative Examples 1 to 5>
Example 2 in the same manner as Example 1, except that the types and blending amounts of the synthetic pulp (A), the binder fiber (B), the natural pulp (C), and the particles (D) are changed as described in Table 2. Synthetic paper (P2) to synthetic paper (P6) of Example 6 and synthetic paper (p1) of Comparative Example 1 to synthetic paper (p5) of Comparative Example 5 were respectively produced.

  The synthetic paper (P1) to (P6) and (p1) to (p5) obtained in Examples 1 to 6 and Comparative Examples 1 to 5 were evaluated by the following evaluation methods, and the results are shown in Table 2.

<Evaluation method>
Basis weight: Measured by the method defined in JIS P 8124 (2011).

  Texture: It was evaluated by a hand-held sensory test method. The score is a 5 point method, with 5 points being the closest to the paper formed from natural pulp and superior, and 1 point being the farthest inferior to the paper formed from natural pulp. When it was judged that it was practicable, it was rated as 3 or more. It evaluated by three panelists, and made the evaluation result most evaluation point. When there are a plurality of evaluation points having the highest number, the average value of the plurality of evaluation points is taken as the evaluation result.

  Embossability: The depth of the embossed portion of the patterned paper was measured with a surface roughness tester defined in JIS B 0651 (2001), and the sharpness of the pattern was visually evaluated and scored by a 5-point method. Five points are the best and one point is the worst. When it was judged that it was practicable, it was rated as 3 or more. It evaluated by three panelists, and made the evaluation result most evaluation point. When there are a plurality of evaluation points having the highest number, the average value of the plurality of evaluation points is taken as the evaluation result.

Evaluation of oil absorption: The obtained synthetic paper is cut into 10 cm square, the weight (weight before immersion) is measured, the product is immersed in a commercially available salad oil for 10 minutes, taken out, the surface oil is wiped off, and the weight (after immersion) Weight) was measured, and the oil adsorption amount (%) was calculated from the following equation. In addition, it rounded off to the first place.
Oil adsorption amount (%) = weight after immersion / weight before immersion x 100
If the oil adsorption amount (%) is 350% or more, it can be judged that the oil absorption is excellent.

Evaluation of water absorbency: The obtained synthetic paper is cut into 10 cm square, the weight (weight before immersion) is measured, the product is dipped in tap water for 10 minutes, taken out, the surface water is wiped off, and the weight (weight after immersion) ) Was measured, and the water adsorption amount (%) was calculated from the following equation. In addition, it rounded off to the first place.
Water adsorption amount (%) = weight after immersion / weight before immersion x 100
If the water adsorption amount (%) is 350% or more, it can be judged that the water absorbability is excellent.

  In Table 2, "-" means that the corresponding component is not included. In addition, “cannot maintain a paper that has become independent” means that it could not be evaluated because it was broken when it was lifted.

As apparent from the results in Table 2, polyolefin synthetic pulp (A) having a Canadian Standard Freeness (CSF) of 100 ml or more and 520 ml or less, a binder fiber (B), and a fiber length of 1 mm or more and 80 mm or less The synthetic papers (P1 to P6) of Examples 1 to 6 which contain a certain natural pulp (C) and the content of the polyolefin synthetic pulp (A) is 20% by mass or more have texture, oil absorption and water absorption. It was excellent. Moreover, the embossing was also excellent. In particular, the synthetic paper (P5) of Example 5 containing the water-soluble polymer (E) was more excellent in texture than the synthetic paper (P1) of Example 1 not containing the water-soluble polymer (E). .
The synthetic paper (P6) of Example 6 containing zeolite particles carrying silver ions as particles (D) was subjected to a viable count test for Staphylococcus aureus according to JIS L 1902 (2015), and the bacteria were detected. It could be confirmed that it had antibacterial properties without causing it to

On the other hand, it includes the synthetic paper (p1) and the natural pulp (C) of Comparative Example 1 having the same composition as in Example 1 except that the polyolefin-based synthetic pulp contains the polyolefin-based synthetic pulp (a1) exceeding 520 ml. The synthetic paper (p2) of Comparative Example 2 having the same composition as that of Example 1 except for the absence was inferior in water absorbency and feeling.
In Comparative Example 3 in which production of a synthetic paper (p3) composed of a composition not containing a binder fiber (B) was attempted, it was not possible to produce a self-supporting synthetic paper.
The synthetic paper (p4) of Comparative Example 4 in which the content of the polyolefin-based synthetic pulp (A) was less than 20% and did not contain the binder fiber (B) was inferior in oil absorption.
The synthetic paper (p5) of Comparative Example 5 in which the blending amount of the polyolefin-based synthetic pulp (A) was less than 20% was inferior in oil absorption and water absorption.

  According to the present invention, it is possible to not only wipe off oil stains attached to the hand, but also to wipe away stains having both water and oil properties such as dressing, and to provide a wiping paper made of synthetic paper that reproduces the texture of the paper. Can.

Claims (6)

A wiping paper made of synthetic paper,
The synthetic paper is a polyolefin-based synthetic pulp (A) having a Canadian standard freeness of 100 ml to 520 ml, a binder fiber (B), and a natural pulp (C) having a fiber length of 1 mm to 80 mm. Including
The wiping paper whose content of the said polyolefin-type synthetic pulp (A) with respect to the total mass of the said synthetic paper is 20 mass% or more.   The wiping paper according to claim 1, wherein the binder fiber (B) contains a fiber having a melting point of 70 ° C or more and 130 ° C or less.   The binder fiber (B) comprises at least one selected from the group consisting of polyethylene fibers, low melting point polyester fibers, acrylic fibers, polyethylene / polypropylene composite fibers, polyethylene / polyethylene terephthalate composite fibers, and polyester composite fibers. The paper according to claim 1 or 2.   The synthetic paper according to any one of claims 1 to 3, wherein the synthetic paper further comprises particles (D) having an average particle diameter of 1 μm to 150 μm and a specific gravity of 1.5 to 10. Wipe paper.   The particles (D) are at least one selected from the group consisting of zeolite, apatite, calcium carbonate, titanium dioxide, silicon dioxide, barium sulfate, aluminum oxide, zirconium phosphate, calcium silicate, kaolin, talc, and copper oxide 5. A wipe according to claim 4 comprising. The paper according to claim 4 or 5, wherein the particles (D) include particles carrying silver ions.