JP4182838B2 - Bulking agent, bulky paper, and method for producing bulky paper - Google Patents

Description

  The present invention relates to a bulking agent that is excellent in bulkiness and has a low friction coefficient, a method for producing bulky paper using the bulking agent, and a paper filled with the bulking agent.

  Comic books and paperbacks have rapidly spread, reflecting the recent separation of print. Along with this, paper is also required to be lighter. Here, the weight reduction of paper refers to weight reduction while maintaining the thickness of the paper, that is, increase in bulk (reduction in density). Now that environmental problems are being sought, paper weight reduction is an unavoidable problem in making effective use of paper pulp made from forest resources.

  As a conventional technique for increasing the bulk of paper, there is a method of using a bulky pulp composition obtained by reacting a mixture of pulp and hydrophobic fibers with a crosslinking agent (see Patent Document 1). In addition, there is a method for producing a bulky pulp sheet by mixing cellulose pulp, a specific form of polyester composite fiber, and a heat-fusible binder (see Patent Document 2). However, the use of cross-linked pulp, synthetic fibers, etc. has the problem of making paper impossible to recycle. Further, there is a technique for producing a bulky neutral paper by filling hollow spherical vaterite type calcium carbonate (see Patent Document 3), but there is a problem that it is a special filler. In addition, there is a method of producing a low-density bulky paper by making paper from pulp and heat-expandable particles (see Patent Document 4). The method using foamable particles has a problem that the paper strength is remarkably lowered. Also, there is a method using bacterial cellulose and expandable particles (see Patent Document 5), but a special cellulose called bacterial cellulose must be used, which is not practical.

  Further, in the method using a surfactant, a bulking agent for paper containing a specific alcohol and / or a polyoxyalkylene adduct thereof is disclosed (see Patent Document 6). There is also a method using a nonionic surfactant (see Patent Document 7). Further, a paper bulking agent comprising a polyhydric alcohol and a fatty acid ester compound (see Patent Document 8) is disclosed, and there is a technique in which this paper bulking agent is applied to paperboard (see Patent Document 9). When this polyhydric alcohol and fatty acid ester are added, it is possible to make the paper bulky, but at the same time, a sharp decrease in the friction coefficient of the paper occurs. There is a problem that troubles in printing runnability such as poor paper running and tension fluctuation at the time of paper change occur.

  Non-surfactant-based bulking agent technology discloses a paper bulking agent containing at least one compound selected from a cationic compound having a specific structure, an amine, an acid salt of an amine, and an amphoteric compound. (See Patent Document 10). There is also a bulking agent of the fatty acid polyamide polyamine type. Further, a compound having a water separation degree of 4% or more and a compound having an effect of improving paper quality of any one of bulk, whiteness, and opacity is described (see Patent Document 11). Furthermore, a method for producing a pulp sheet using a compound having a water separation degree of 4% or more and having a paper quality improving effect of any one of bulk, whiteness and opacity is disclosed (patent) Reference 12).

Patent No. 2903256 Japanese Patent No.2591685 Japanese Patent No. 1755152 Japanese Patent Laid-Open No. 5-230798 Japanese Patent Laid-Open No. 11200282 International Publication No. 98/03730 Pamphlet JP 11-200283 A Patent No. 2971447 Specification Patent No. 3041294 JP 11-269799 A Japanese Patent No. 3283248 Japanese Patent Laid-Open No. 2003-105685

  An object of the present invention is to provide a bulking agent that is excellent in bulkiness and has a low friction coefficient, a method for producing bulky paper using the bulking agent, and a paper filled with the bulking agent.

Emulsion particles containing at least one of lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, and linoleic acid amide , the main component of which is a linear fatty acid monoamide having 12 to 22 carbon atoms This can be solved by using a bulking agent having an average particle diameter measured by the laser diffraction scattering method of 0.3 to 20 μm and a standard static friction coefficient reduction rate of 20% or less.

Emulsions mainly composed of at least one of lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, and linoleic acid amide , which are linear fatty acid monoamides having 12 to 22 carbon atoms The paper obtained by making paper by adding a bulking agent for paper whose average particle diameter measured by laser diffraction scattering method of particles is 0.3-20 μm and whose standard static friction coefficient reduction rate is 20% or less is bulky. There is little decrease in the coefficient of friction.

The bulking agent as the first invention will be described. The fatty acid monoamide has a structure in which one amino group is bonded to a linear fatty acid having 12 to 22 carbon atoms, and the fatty acid may be saturated or unsaturated. Specifically, lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, Ri linoleic acid amide Nadogaa, preferably straight-chain fatty acid monoamide having 16 to 18 carbon atoms, more Preferred is a linear saturated fatty acid monoamide having 16 to 18 carbon atoms. When the carbon number is 11 or less, the bulkiness effect is inferior, and when the carbon number is 23 or more, the dispersion or emulsification of the fatty acid monoamide is poor and a good dispersion cannot be obtained. These linear fatty acid monoamides may be used alone or in combination of two or more.

  The bulking agent of the present invention is an emulsion in which a linear fatty acid monoamide is emulsified and dispersed. The above linear fatty acid monoamide is put in an emulsifying apparatus such as a homomixer together with hot water and an emulsifier, and is melted at a melting temperature or higher at the time of emulsification to be emulsified and dispersed. By appropriately adjusting the type and amount of the emulsifier, the stirring strength during emulsification, the emulsification time, and the like, emulsion particles having a good particle size distribution can be obtained. Of these, emulsifiers are important. The emulsifier is used alone or in combination of two or more selected from anionic, cationic, nonionic, and amphoteric.

  Examples of anionic emulsifiers include fatty acids such as lauric acid, palmitic acid, stearic acid, and oleic acid, higher alcohol sulfates, higher alkyl ether sulfates, sulfate esters such as sulfated olefins, sulfate esters such as sulfated olefins, and alkylbenzenesulfone. Examples thereof include sulfonic acid esters such as acid, alkylnaphthalene sulfonic acid, paraffin sulfonic acid and sulfosuccinic acid diester, and phosphoric acid esters such as higher alcohol phosphoric acid esters and salts of alkali metals, alkaline earth metals, amines, and the like.

  Examples of cationic or amphoteric emulsifiers include quaternary ammonium salts such as alkyltrimethylammonium chloride salts and alkyldimethylbenzylammonium chloride salts, alkylpyridium chloride salts, alkylbetaines, and cationized starches (tertiary or quaternary). ) And the like.

  Nonionic emulsifiers include higher alcohol ethylene oxide adduct, alkylphenol ethylene oxide adduct, fatty acid ethylene oxide adduct, polyhydric alcohol fatty acid ester ethylene oxide adduct, higher alkylamine ethylene oxide adduct, fatty acid amide ethylene oxide adduct. , Polyethylene glycol types such as fat and oil ethylene oxide adduct, polypropylene glycol ethylene oxide adduct, glycerol fatty acid ester, pentaerythritol fatty acid ester, sorbitol fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, alkanolamine And polyhydric alcohol types such as fatty acid amides, polyvinyl alcohol and the like.

  The average particle diameter of the emulsion particles is 0.3 to 20 μm. Even if it is less than 0.3 μm or more than 20 μm, the bulkiness is lowered. The reason for this is not clear, but when the average particle size is less than 0.3 μm, it is considered that the yield of the emulsion particles in the wet paper is low during paper making, and as a result, it is difficult to increase the bulk. In addition, when the average particle diameter is more than 20 μm, the number of emulsion particles in the wet paper is small, and therefore, the presence of the emulsion particles in the wet paper becomes non-uniform, and it is considered that the bulk is not easily produced. The amount of the emulsifier is appropriately determined so that the average particle diameter of the emulsion particles falls within the range of 0.3 to 20 μm, and is not particularly limited, but is usually 0.1 to 50% by weight (solid) with respect to the bulking agent. A range is preferred. If it is less than 0.1% by weight, it is difficult to obtain a stable emulsion, and even if it is added in excess of 50% by weight, the average particle size is unlikely to become small. Further, from the viewpoint of not changing the paper quality (excluding bulk and friction coefficient) of the paper filled with the bulking agent of the present invention, 0.1 to 20% by weight is more preferable.

  The bulking agent of the present invention thus obtained has an average particle size of 0.3 to 20 μm as measured by a laser diffraction scattering method of emulsion particles, a concentration of preferably 0.5 to 50% by weight, and a zeta potential of −50 to +50 mV.

  The bulking agent of the present invention having a mean particle diameter of 0.3 to 20 μm as a main component of a linear fatty acid monoamide having 12 to 22 carbon atoms and measured by a laser diffraction scattering method of the emulsion particles is a standard defined below. Static friction coefficient reduction rate is 20% or less.

[Definition of standard static friction coefficient reduction rate]
LBKP (freezing degree CSF 450 ml) is used as the pulp content, and the sulfate band is 1.0 solid weight% per pulp (50 solid weight sulfuric acid band product), and the cationized starch is 0.5 weight% per pulp. The stock is prepared by adding as described above. Using this stock, a paper is made using a laboratory oriented paper machine (Kumaya Riki Kogyo Co., Ltd.) at a paper making speed of 900 m / min and a basis weight of 60 g / m ² . The wet paper thus made is pressed at an effective press pressure of 4.18 kg / cm ² and dried at 105 ° C. for 3 minutes using a mirror dryer to obtain a handmade paper. The static friction coefficient of this handmade paper is measured according to ISO 15359, and this is A. In addition to sulfate band and cationized starch, the bulking agent of the present invention was added at 1.0% solids by weight per pulp to prepare a paper stock, and the static friction coefficient of handmade paper was measured by the same treatment as above. Let this be B. Calculate the standard static friction coefficient reduction rate from the following equation.
Standard static friction coefficient reduction rate (%) = 100 x (AB) / A
The friction coefficient is measured in the MD direction by superposing the F surface and the W surface.

  A method for producing bulky paper according to the second invention will be described. 2nd invention removes the manufacturing method of neutral bulky paper which uses together linear saturated fatty acid amide and the alkyl ketene dimer size agent among the bulking agents for paper of 1st invention. The bulky paper of the present invention is produced from various pulps by a normal papermaking process. As the raw material pulp, chemical pulp, mechanical pulp, waste paper pulp and the like can be used alone or mixed at an arbitrary ratio. Even when mechanical pulp and / or waste paper pulp is included in the pulp used as the raw material for paper, the bulking agent of the first invention exhibits good bulkiness.

  The place where the bulking agent of the first invention is added is before the paper making process and is internally added. Although it is not particularly limited as long as it is a place before the papermaking process, it is preferably before a mixing chest or a secondary fan pump, and preferably before adding a yield improver.

  Since the bulking agent is an inhibiting factor for the bond between the pulp fibers, generally, the strength of the paper tends to decrease. In addition, even if the amount of addition exceeds a certain level, the effect is likely to reach its peak. Therefore, it is preferable to add a bulking agent in the range of 0.1 to 20% by solid weight to the raw material pulp, and the effect of the bulking agent is fully expressed without changing the paper quality (excluding bulk and friction coefficient) so much. More preferably, the content is 0.1 to 5% by weight.

  Generally, when adding an ester compound of a polyhydric alcohol and a fatty acid used as a bulking agent, the friction coefficient rapidly decreases at the same time as bulking, but the bulking agent of the first invention suppresses a decrease in the friction coefficient, so the added amount Can be increased as compared with conventional bulking agents, and as a result, lower density paper can be produced.

  The method for producing a bulky paper of the present invention includes an acidic papermaking method without adding an internal sizing agent, an acidic papermaking method with an internal sizing agent, a neutral papermaking method without adding an internal sizing agent, and an alkylketene dimer. This is a neutral papermaking method in which a neutral sizing agent is added.

  Bulky paper may be blended without filler or may be blended. When the filler is blended, the filler generally used in acidic papermaking or neutral papermaking can be used, and is not particularly limited. For example, for neutral papermaking, clay, calcined kaolin, deramikaolin, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, hydroxide Inorganic fillers such as calcium, magnesium hydroxide, and zinc hydroxide, and organic fillers such as urea-formalin resin, polystyrene resin, phenol resin, and fine hollow particles are used singly or in appropriate combination of two or more. Further, in acidic papermaking, a filler obtained by removing acid-soluble ones from the filler used in the neutral papermaking is used, and these are used alone or in combination of two or more as appropriate.

  In the bulky paper manufacturing method of the present invention, various conventionally used nonionic and cationic retention agents, freeness improvers, paper strength improvers, and the like are used as necessary for papermaking. It is appropriately selected and used.

  In addition, an internal additive for papermaking may be added. For example, it may be easily added to basic aluminum compounds such as sulfate band, aluminum chloride, sodium aluminate, basic aluminum chloride, basic polyaluminum hydroxide, and water. Examples thereof include water-soluble aluminum compounds such as decomposable alumina sol, polyvalent metal compounds such as ferrous sulfate and ferric sulfate, and silica sol.

  Other starches for papermaking, various starches, polyacrylamide, urea resin, melamine resin, epoxy resin, polyamide resin, polyamide, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide, hydrophilic cross-linked polymer Various compounds such as particle dispersions and derivatives or modified products thereof can be used.

  Furthermore, paper additives such as dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents, and the like can be appropriately added depending on the intended use.

  The type of the paper machine is not particularly limited, and can be appropriately made with a long paper machine, a twin wire machine, a Yankee paper machine, or the like. The press line pressure is used within the normal operating range. The surface treatment agent may or may not be applied. When applying the surface treatment agent, there are no particular limitations on the components of the surface treatment agent, and the size press type is also not limited, and a liquid film transfer type size press such as a 2-roll size press, a gate roll size press, or a shim sizer. Etc. can be used as appropriate. The calendar is used at a linear pressure within the normal operating range, but from the viewpoint of producing bulky paper, a low linear pressure is preferable as long as the smoothness of the paper can be maintained, and a soft calendar is preferable.

  The bulky paper which is the third invention will be described. 3rd invention removes the neutral bulky paper which uses together linear saturated fatty acid amide and the alkyl ketene dimer size agent among the bulking agents for paper of 1st invention. The bulky paper of the present invention is characterized by excellent bulkiness and a relatively high coefficient of friction. Although the use of the bulky paper is not particularly limited, for example, it is suitable as an offset printing paper. In addition, it can also be used as a base paper for information recording paper such as letterpress printing paper, electrophotographic paper, ink jet recording paper, thermal recording paper, pressure sensitive recording paper, PPC paper, form paper and the like. It can also be used as a base paper for coated paper. In recent years, with the increase of environmental problems, there has been a tendency to increase the amount of waste paper pulp. The bulking agent of the first invention exhibits remarkable bulkiness regardless of the amount of waste paper pulp. Therefore, it is effective not only for newsprint but also for paperboard and white paperboard.

  Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited thereto.

<Preparation of fatty acid amide emulsion>
25 g of fatty acid amide, 2.5 g of potassium coconut fatty acid as an emulsifier and 472.5 g of hot water at 95 ° C. are placed in a high-pressure homogenizer (manufactured by APVGaulin Inc) and treated under a pressure of 550 kg / cm 2 for 10 minutes. The maximum temperature during processing is about 120 ° C. After the high-pressure homogenizer treatment, it was immediately diluted with 15 ° C. fresh water to obtain a fatty acid amide emulsion.
The average particle size of the obtained emulsion particles is a particle size with respect to 50% of the integrated volume distribution measured with a laser particle size distribution meter (Mastersizer: manufactured by Malvern Instruments).
The bulking agents of the present invention are described in Examples 1-10 below.
[Example 1]

The emulsion was prepared using lauric acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 0.3 μm was obtained (EM-1). The standard static friction coefficient decrease rate was 12.5%.
[Example 2]

The emulsion was prepared using palmitic acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 0.3 μm was obtained (EM-2). The standard static friction coefficient decrease rate was 13.6%.
[Example 3]

The emulsion was prepared using stearic acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 0.4 μm was obtained (EM-3). The standard static friction coefficient decrease rate was 14.0%.
[Example 4]

The emulsion was prepared using behenamide as a raw material. Emulsification was good and an emulsion having an average particle size of 0.6 μm was obtained (EM-4). The standard static friction coefficient decrease rate was 15.2%.
[Example 5]

The emulsion was prepared using oleic acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 2.3 μm was obtained (EM-5). The standard static friction coefficient decrease rate was 10.1%.
[Example 6]

The emulsion was prepared using linoleic acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 3.6 μm was obtained (EM-6). The standard static friction coefficient decrease rate was 8.3%.
[Example 7]

The emulsion was prepared using palmitic acid amide / stearic acid amide = 50/50 (solid content weight ratio) as a raw material. Emulsification was good and an emulsion having an average particle size of 0.4 μm was obtained (EM-7). The standard static friction coefficient decrease rate was 13.9%.
[Example 8]

The emulsion was prepared using oleic acid amide / linoleic acid amide = 50/50 (solid content weight ratio) as a raw material. Emulsification was good and an emulsion having an average particle size of 3.2 μm was obtained (EM-8). The standard static friction coefficient decrease rate was 9.1%.
[Example 9]

The emulsion was prepared using stearic acid amide as a raw material. Emulsification was good, and an emulsion having an average particle size of 8.9 μm was obtained (EM-9). The standard static friction coefficient decrease rate was 13.2%. The emulsification at this time was performed for 5 minutes under a pressure of 200 kg / cm2.
[Example 10]

The emulsion was prepared using stearic acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 19.8 μm was obtained (EM-10). The standard static friction coefficient decrease rate was 13.5%. The emulsification at this time was performed for 5 minutes under a pressure of 100 kg / cm 2.
[Comparative Example 1]

The emulsion was prepared using stearic acid amide as a raw material. Emulsification was good, and an emulsion having an average particle size of 0.2 μm was obtained (EM-11). The standard static friction coefficient decrease rate was 10.4%. The emulsification at this time was carried out under a pressure of 700 kg / cm 2 for 15 minutes.
[Comparative Example 2]

The emulsion was prepared using stearic acid amide as a raw material. Emulsification was good and an emulsion having an average particle size of 24.5 μm was obtained (EM-12). The standard static friction coefficient decrease rate was 10.5%. The emulsification at this time was performed for 5 minutes under a pressure of 150 kg / cm 2.
[Comparative Example 3]

The emulsion was prepared using capric amide as a raw material. Emulsification was good, and an emulsion having an average particle size of 0.3 μm was obtained (EM-13). The standard static friction coefficient decrease rate was 8.6%.
[Comparative Example 4]

An attempt was made to prepare the emulsion using lignoceric acid amide as a raw material, but emulsification was poor (EM-14).
[Comparative Example 5]

The emulsion was prepared using isostearamide as a raw material. Emulsification was good and an emulsion having an average particle size of 0.4 μm was obtained (EM-15). The standard static friction coefficient decrease rate was 6.5%.
The preparation results of the above fatty acid amide emulsions are summarized in Table 1.

<Manufacture of acid bulk paper>
LBKP (freeness CSF 450 ml) was used as the pulp content. To this, a bulking agent is 1.0% solids by weight per pulp, a sulfuric acid band is 1.0% by weight per pulp (sulfuric acid band product of 50 solids weight), cationized starch is 0.5% by weight per pulp, and talc is A paper stock was prepared by adding 3% by weight per pulp. Then, using an experimental orientation paper machine (Kumaya Riki Kogyo Co., Ltd.), paper was made at a paper speed of 900 m / min to a basis weight of 60 g / m ² , pressed at 4.18 kg / cm ² for 5 minutes, and using a mirror dryer And dried at 105 ° C. for 3 minutes to obtain acidic paper. The density, static friction coefficient, and dynamic friction coefficient of the acidic paper were measured. The results are shown in Table 2.
Density: Measured according to JIS P 8118.
-Coefficient of static friction, coefficient of dynamic friction: measured in accordance with ISO 15359. The friction coefficient was measured in the MD direction by superposing the F and W surfaces.
The bulky paper of the present invention was described in Examples 11-21 below.
[Example 11]

As a bulking agent, the bulking agent emulsion EM-1 of Example 1 was used.
[Example 12]

As the bulking agent, the bulking agent emulsion EM-2 of Example 2 was used.
[Example 13]

As a bulking agent, the bulking agent emulsion EM-3 of Example 3 was used.
[Example 14]

The bulking agent emulsion EM-4 of Example 4 was used as the bulking agent.
[Example 15]

The bulking agent emulsion EM-5 of Example 5 was used as the bulking agent.
[Example 16]

As a bulking agent, the bulking agent emulsion EM-6 of Example 6 was used.
[Example 17]

As the bulking agent, the bulking agent emulsion EM-7 of Example 7 was used.
[Example 18]

The bulking agent emulsion EM-8 of Example 8 was used as the bulking agent.
[Example 19]

As the bulking agent, the bulking agent emulsion EM-9 of Example 9 was used.
[Example 20]

As the bulking agent, the bulking agent emulsion EM-10 of Example 10 was used.
[Comparative Example 6]

Instead of the emulsion EM-1 of Example 11, the emulsion EM-11 of Comparative Example 1 was used.
[Comparative Example 7]

Instead of the emulsion EM-1 of Example 11, the emulsion EM-12 of Comparative Example 2 was used.
[Comparative Example 8]

Instead of the emulsion EM-1 of Example 11, the emulsion EM-13 of Comparative Example 3 was used.
[Comparative Example 9]

Instead of the emulsion EM-1 of Example 11, the emulsion EM-14 of Comparative Example 4 was used.
[Comparative Example 10]

Instead of the emulsion EM-1 of Example 11, the emulsion EM-15 of Comparative Example 5 was used.
[Comparative Example 11]

Instead of the emulsion EM-1 in Example 11, a commercially available bulking agent comprising a diester of pentaerythritol and stearic acid as components was used.
[Comparative Example 12]

  Performed in the same manner as in Example 11 except that the emulsion EM-1 of Example 11 was not added.

  From the results shown in Tables 1 and 2, a straight chain fatty acid amide having 12 to 22 carbon atoms having an average particle diameter of 0.3 to 20 μm and a standard static friction coefficient reduction rate of 20% or less is high in bulkiness. It turns out that it is excellent and the fall of a static friction coefficient can be suppressed. Moreover, it turns out that the fall of a static friction coefficient is suppressed more with the unsaturated fatty acid amide shown in Example 15,16,18.

<Manufacture of neutral bulky paper>
LBKP (freeness CSF 450 ml) was used as the pulp content. This includes a bulking agent at 1.0% solids by weight per pulp, a sulfuric acid band at 1.0% by weight per pulp (50% solids by weight sulfuric acid band product), a cationized starch at 0.5% solids by weight per pulp, an alkenyl anhydrous succinate. A paper stock was prepared by adding an acid-based sizing agent to 0.1 solid weight% per pulp and heavy calcium carbonate to 3 solid weight%. Then, using an experimental orientation paper machine (Kumaya Riki Kogyo Co., Ltd.), paper was made at a paper speed of 900 m / min to a basis weight of 60 g / m ² , pressed at 4.18 kg / cm ² for 5 minutes, and using a mirror dryer And neutralized at 105 ° C. for 3 minutes. The density, static friction coefficient, and dynamic friction coefficient of the neutral paper were measured.
The neutral bulky paper of the present invention was described in Examples 21-30 below.
[Example 21]

As a bulking agent, the bulking agent emulsion EM-1 of Example 1 was used.
[Example 22]

As the bulking agent, the bulking agent emulsion EM-2 of Example 2 was used.
[Example 23]

As a bulking agent, the bulking agent emulsion EM-3 of Example 3 was used.
[Example 24]

The bulking agent emulsion EM-4 of Example 4 was used as the bulking agent.
[Example 25]

The bulking agent emulsion EM-5 of Example 5 was used as the bulking agent.
[Example 26]

As a bulking agent, the bulking agent emulsion EM-6 of Example 6 was used.
[Example 27]

As the bulking agent, the bulking agent emulsion EM-7 of Example 7 was used.
[Example 28]

The bulking agent emulsion EM-8 of Example 8 was used as the bulking agent.
[Example 29]

As the bulking agent, the bulking agent emulsion EM-9 of Example 9 was used.
[Example 30]

As the bulking agent, the bulking agent emulsion EM-10 of Example 10 was used.
[Comparative Example 13]

Instead of the emulsion EM-1 of Example 21, the emulsion EM-11 of Comparative Example 1 was used.
[Comparative Example 14]

Instead of the emulsion EM-1 of Example 21, the emulsion EM-12 of Comparative Example 2 was used.
[Comparative Example 15]

Instead of the emulsion EM-1 in Example 21, the emulsion EM-13 in Comparative Example 3 was used.
[Comparative Example 16]

Instead of the emulsion EM-1 of Example 21, the emulsion EM-14 of Comparative Example 4 was used.
[Comparative Example 17]

Instead of the emulsion EM-1 of Example 21, the emulsion EM-15 of Comparative Example 5 was used.
[Comparative Example 18]

It replaced with the emulsion EM-1 of Example 21, and the commercially available bulking agent which uses the diester body of a pentaerythritol and a stearic acid as a component was used.
[Comparative Example 19]

  Performed in the same manner as in Example 21 except that the emulsion EM-1 of Example 21 was not added.

From the results shown in Tables 1 and 3, a straight chain fatty acid amide having 12 to 22 carbon atoms having an average particle size of 0.3 to 20 μm and a standard static friction coefficient reduction rate of 20% or less is high in bulkiness. It turns out that it is excellent and the fall of a static friction coefficient can be suppressed. It can also be seen that the unsaturated fatty acid amides shown in Examples 25, 26, and 28 can further suppress the reduction of the static friction coefficient.

Claims (3)

Paper bulking agent, which is a linear fatty acid monoamide having 12 to 22 carbon atoms, at least one of lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, linoleic acid amide A bulking agent for paper, characterized by having an average particle size of 0.3 to 20 μm as a main component and measuring the emulsion particles by a laser diffraction scattering method and a standard static friction coefficient reduction rate of 20% or less.   A method for producing a bulky paper, wherein the bulking agent for paper according to claim 1 is internally added before the papermaking step (however, a linear saturated fatty acid amide in the bulking agent for paper according to claim 1 and (Excluding the method for producing neutral bulky paper in combination with alkyl ketene dimer sizing agent).   A bulky paper obtained by adding the paper bulking agent according to claim 1 before the papermaking step and making a paper (however, a linear saturated fatty acid amide of the paper bulking agent according to claim 1). And neutral bulky paper obtained by using together an alkyl ketene dimer sizing agent).