JP3387036B2 - Smoothness and air permeability improver - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an agent for improving smoothness and air permeability of a pulp sheet.

[0002]

2. Description of the Related Art Pulp sheets, especially printing papers and information papers, are required to have high smoothness for clear printing. In order to improve the smoothness of the pulp sheet, generally known is a method of increasing the linear pressure of the press, improving the surface of the apparatus such as calendering, or using pulp having an increased beating degree. However, in these methods, a dense and dense sheet results in a sheet having low air permeability, and blisters are likely to occur during offset printing. on the other hand,
The sheet obtained by a method of lowering the linear pressure of the press or using a pulp having a low beating degree is a sheet having low density and high air permeability, but a sheet having low smoothness. Further, a crosslinked pulp is used (JP-A-4-185792, etc.), mixed with synthetic fibers (JP-A-3-269199, etc.), and a filler such as an inorganic substance is filled between pulp fibers (JP-A-3-124895 etc.). ), It is possible to obtain a paper having a low density and a high air permeability by a method such as providing voids (Japanese Patent Laid-Open No. 5-230798 etc.), but it is impossible to recycle the pulp or the smoothness of the sheet is impaired. Or

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems associated with printing. Specifically, the pulp surface is modified to improve smoothness and air permeability. It is to provide an agent that achieves the improvement at the same time.

[0004]

Means for Solving the Problems The present invention is a compound having a water separation of 4% or more as defined below, and has at least one of the following paper quality improving effects (i) to (iii). The present invention relates to a smoothing agent and a gas permeability improving agent for a pulp sheet, which is composed of a compound which brings about a smoothing property and is added before a papermaking step. (I) Standard bulk improvement is 0.02 g / cm ³ or more (ii) Standard whiteness improvement is 0.5 points or more (iii) Standard opacity improvement is 0.5 points or more Water separation (%) = (α ₀ -α) / Α ₀ × 100 α: Pulp 100 is used as a compound to improve smoothness and air permeability.
Water content of wet sheet obtained by adding 5 parts by weight to weight part α ₀ : water content of wet sheet obtained by paper making without adding a compound which becomes a smoothness and air permeability improving agent to the pulp The method for measuring the degree of water separation, the standard bulk improvement, the standard whiteness improvement and the standard opacity improvement in the invention will be described in detail.

[Measurement Method of Water Separation] (A) Pulp Used Hunter Whiteness (JIS P 812) of a handmade pulp sheet prepared by the method for preparing a handmade paper for pulp test of JIS P 8209.
3) The bleached hardwood pulp from beech (80% ± 5%) (hereinafter referred to as LBKP) is used. (B) Measurement of water separation degree A certain amount of LBKP was disintegrated with a beater at 25 ± 3 ° C. and beaten to 460 ± 10 mL at Canadian standard freeness (JIS P 8121) to obtain a LBKP slurry having a pulp concentration of 1.0% by weight. To get This pulp slurry was weighed so that the basis weight of the LBKP of the sheet after paper making was 80 ± 2 g / m ² , and the pH was adjusted to 4.5 with aluminum sulfate, and then 1.0% of the smoothness and air permeability improver was adjusted. 5% by weight (pure content) of 100% by weight of ethanol solution was added to the pulp, and the paper was made with a 150 mm wire (area 200 cm ² ) using a round tappy paper machine to obtain a wet sheet. 320 ± 20g / m ² basis weight on wet sheet
Two pieces of filter paper (diameter 185 mm) are stacked, a coach plate is further stacked on the filter paper, and the wet sheet is taken out. Then, the wet sheet is sandwiched between the above two filter papers at the upper and lower sides and pressed at a pressure of 340 ± 10 kPa for 5 minutes. Immediately after pressing, the weight w (g) of the wet sheet is weighed. Then 105
Weight of dried sheet obtained after drying at ± 3 ° C for 60 minutes W _d
Weigh (g). From W and W _d obtained above, the water content α according to the equation (1)
Calculate (%). α (%) = (W−W _d ) / W × 100 (1) Further, a sheet was prepared in the same manner without adding a compound serving as a smoothness and air permeability improving agent, and the water content determined in the same manner was α. _Set to ₀ . From the water contents α and α ₀ obtained above, the water separation degree is obtained from the following equation (2). Water separation rate (%) = (α ₀ −α) / α ₀ × 100 (2).

[Measurement Method for Standard Bulk Improvement] A certain amount of LBKP was disintegrated with a beater at 25 ± 3 ° C. and beaten to 460 ± 10 mL at Canadian standard freeness (JIS P 8121) to obtain a pulp concentration of 1.0. A wt% LBKP slurry is obtained. After weighing this pulp slurry so that the basis weight of the LBKP of the sheet after papermaking is 80 ± 0.5 g / m ² ,
After adjusting the pH to 4.5 with aluminum sulphate, add 1.0% by weight ethanol solution of smoothness and air permeability improver to pulp 100
0.5 parts by weight (pure content) is added to parts by weight, and paper is made with a 150 mm wire (area 200 cm ² ) using a round tapping paper machine to obtain a wet sheet. 320 ± 20g basis weight on wet sheet
Two sheets of filter paper (diameter: 185 mm) of / m ² are superposed, and a coach plate is superposed on the sheets, and the wet sheet is taken out. Then, the wet sheet is sandwiched between the above two filter papers at the upper and lower sides and pressed at a pressure of 340 ± 10 kPa for 5 minutes. After pressing
Only the sheet is dried for 2 minutes at 105 ± 3 ° C using a mirror dryer. The dried sheet is conditioned at 20 ± 1 ° C. and a humidity of 65 ± 2% for 5 hours. Measure the weight of the conditioned sheet and use the following formula (3)
The basis weight (g / m ² ) is calculated by Basis weight (g / m ² ) = sheet weight / 0.02 (3) Next, the thickness of the conditioned sheet is measured at 10 points using a paper micrometer at a pressure of 54 ± 5 kPa, and the average value obtained Is the thickness (mm). The tenacity d (g / cm ³ ) is calculated from the basis weight and the thickness obtained above by the following formula (4). d = (basis weight) / (thickness) × 0.001 (4) Further, a sheet was prepared in the same manner without adding a compound serving as a smoothness and air permeability improving agent, and the tenacity determined in the same manner was calculated as d.
_Set to ₀ . The standard bulk improvement degree is calculated from the following equation (5) from the above-obtained stringencies d and d ₀ . Standard degree of bulk improvement (g / cm ³ ) = d ₀ −d (5).

[Measurement Method of Standard Whiteness Improvement] The same as the standard bulkiness measurement method. The humidity adjusted sheet is measured for whiteness B according to JIS P 8123, Hunter Whiteness. Further, a sheet is prepared in the same manner without adding a compound which becomes a smoothness and air permeability improving agent, and the whiteness obtained in the same manner is designated as B ₀ . From the whitenesses B and B ₀ obtained above, the standard whiteness improvement degree is obtained from the following equation (6). Standard whiteness improvement (point) = B−B ₀ (6).

[Measurement Method of Standard Opacity Improvement] The same as the standard bulk improvement measurement method. Opacity P of the conditioned sheet is measured according to JIS P 8138A. Further, a sheet is prepared in the same manner without adding a compound which becomes a smoothness and air permeability improving agent, and the opacity obtained in the same manner is designated as P ₀ . From the opacity P and P ₀ obtained above, the standard opacity improvement degree is obtained by the following equation (7). Standard opacity improvement (point) = P-P ₀
(7).

As described above, 1.0% by weight is obtained by the predetermined method.
By measuring the water separation degree by adding 5 wt% to the pulp, and measuring the standard bulk improvement, standard whiteness improvement, and standard opacity improvement by adding 0.5 wt% to the pulp. The smoothness and air permeability improver of the present invention is easily specified.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A compound having a water separation degree of 4% or more as defined in the present invention makes the surface of the pulp hydrophobic when it is fixed on the pulp, so that the interfacial tension between the pulp and the aqueous solution is increased, and the inter-pulp during pulping is increased. Due to the large number of voids, a bulky pulp sheet can be obtained, and the reflectance also increases optically, (i) standard bulk improvement, (ii) standard whiteness improvement, and () iii) It is considered that the standard opacity improvement degree is satisfied. Further, it is considered that the increase in the voids between pulps during papermaking improves the efficiency of the sheet surface smoothing process such as pressing and calendering, and at the same time, improves the air permeability due to the low density inside the sheet. Conventionally, the relationship between the degree of water separation and the degree of improvement of (i) to (iii) and the improvement of smoothness and air permeability was not known, but the present inventor found that there is a correlation between them. . Specifically, a compound having a water separation degree defined above of 4% or more, preferably 5% or more, and (i) to (i)
It has been found that when any one or more compounds of ii) that bring about a paper quality improving effect are used, both smoothness and air permeability can be improved even when added in a small amount. In addition, the pulp sheet is a generic term for paper and paperboard described in JIS P0001.

The compound having a water separation of 4% or more according to the present invention has (i) the standard bulk improvement defined in the present invention of 0.02 g / cm ³ or more, preferably 0.025 g / cm ³ or more, more preferably 0.03 g / cm ³ or more.
g / cm ³ or more, (ii) standard whiteness improvement of 0.5 point or more, preferably 0.7 point or more, more preferably 0.9 point or more, and (iii) standard opacity improvement of 0.5 point or more, preferably 0.7 point Above, more preferably
It satisfies any one or more, preferably two or more, of 0.9 points or more of (i) to (iii), and more preferably 3 or more.
It is a compound that satisfies the two requirements.

In the present invention, the compound having a water separation of 4% or more is preferably an organic compound having a hydrophilic group for adsorbing on the pulp surface and a hydrophobic group for hydrophobizing the pulp surface, and (A) an organosiloxane. , (B) glyceryl ether, (C) amide, (D) amine, (E) amine acid salt, (F) quaternary ammonium salt, (G) imidazole, (H) alcohol or alkylene oxide adduct thereof, (I ) Esters of polyhydric alcohols and fatty acids, and (J) Esters of polyhydric alcohols and fatty acids having an oxyalkylene group having 2 to 4 carbon atoms with an average of more than 0 mol and less than 12 mol per 1 mol of the ester compound. Can be selected from the group consisting of

The organosiloxane (A) has a viscosity of 1 at 25 ° C.
0 to 1,000,000 mPa · s methyl polysiloxane, HLB 1-14 polyoxyethylene methyl polysiloxane copolymer by Griffin method, HLB 1-14 poly (oxyethylene oxypropylene) methyl polysiloxane copolymer Etc.

Examples of the glyceryl ether (B) include compounds represented by the following general formula (a).

[0015]

[Chemical 1]

(Wherein R ₁ is an alkyl group having 8 to 35 carbon atoms,
It is an alkenyl group or a β-hydroxyalkyl group. ) Examples of (C) amide, (D) amine, (E) amine salt, (F) quaternary ammonium salt, and (G) imidazole include compounds represented by the following general formulas (b) to (j). The amine acid salt includes both ionized and non-ionized salts.

[0017]

[Chemical 2]

[Wherein Y ₁ and Y ₂ are the same or different from each other and are a hydrogen atom, R ₄ , R ₆ CO-,-(AO) _n -COR ₃ or-(AO) _n -H AO: carbon Number 2 to 4 alkylene oxide Y ₃ : hydrogen atom or -COR ₆

[0019]

[Chemical 3]

R ₁ : the same as in the general formula (a) R ₂ , R ₃ , R ₆ , R ₉ : C7-35 alkyl group, alkenyl group or β-hydroxyalkyl group R ₄ , R ₅ : hydrogen Atom or alkyl group having 1 to 3 carbon atoms R ₇ , R ₈ : alkyl group having 1 to 3 carbon atoms R ₁₀ : hydrogen atom or R ₉ n: average number of moles of 1 to 20 X ⁻ : anion] ( Examples of H) alcohol or its alkylene oxide adduct include compounds represented by the following general formula. RO (XO) _a H In the formula, R represents a linear or branched alkyl or alkenyl group having 6 to 22 carbon atoms or an alkylaryl group having an alkyl group having 4 to 20 carbon atoms, and X is the same or different. And a is a linear or branched alkylene group having 2 to 3 carbon atoms, a is the average number of moles added, and is a number in the range of 0 ≦ a ≦ 20.

The compound (1) represented by the formula (1) is preferable. RO (EO) _m (PO) _n H (1) In the formula, R is a linear or branched alkyl or alkenyl group having 6 to 22 carbon atoms or an alkylaryl group having an alkyl group having 4 to 20 carbon atoms. In the formula, E is an ethylene group, P is a propylene group, m and n are average addition mole numbers, 0 ≦ m ≦ 20, and n is 0 ≦ n ≦ 50. . Note that (EO) _m (PO) _n may be either block or random, and either EO or PO may come first.

Preferably, R in the formula (1) has 8 to 1 carbon atoms.
8 is a compound of a linear or branched alkyl group or alkenyl group.

The compound (1) contains at least two kinds of RO
It also includes those obtained by adding either or both of EO and PO to a mixture of H 2. It also includes ROH alcohol.

The compound represented by the general formula (1) is C ₆
~ C ₂₂ Alcohols such as ethylene oxide (hereinafter referred to as "EO") and propylene oxide (hereinafter referred to as "PO") are added to higher alcohols, alkylphenols, etc., but in the present invention, especially the average addition of EO is added. Those having a number of moles m in the range of 0 ≦ m ≦ 20 are used. The average addition mole number m is preferably in the range of 0 ≦ m ≦ 10, more preferably 0 ≦ m ≦ 5. When m is 20 or less, the effect of giving bulkiness to the paper becomes better. Further, the average number of moles of added PO n is in the range of 0 ≦ n ≦ 50,
The range is preferably 0 ≦ n ≦ 20. When n is 50 or less, it is economically advantageous.

R in the general formula (1) is a linear or branched alkyl or alkenyl group having 6 to 22 carbon atoms or an alkylaryl group having an alkyl group having 4 to 20 carbon atoms. Is preferably a linear or branched alkyl group or alkenyl group having 8 to 18 carbon atoms. When R is an alkyl group or an alkenyl group, it has 6 to 22 carbon atoms, and when it is an alkylaryl group, it has 4 carbon atoms.
When it is an alkylaryl group having from 20 to 20 alkyl groups, the effect of improving smoothness and air permeability on paper becomes better.

When the (EO) _m (PO) _n group in the general formula (1) is a mixed form of polyoxyethylene and polyoxypropylene,
The addition form of the C ₂ H ₄ O group and the C ₃ H ₆ O group may be random or block. In that case, preferably a polyoxypropylene group
It is preferable that (C ₃ H ₆ O group) is contained in an amount of 50 mol% or more, particularly preferably 70 mol% or more based on the total average number of moles added. The AO group bonded to the R group may be either EO or PO first.

The smoothness and air permeability improving agent of the present invention includes (I) an ester of a polyhydric alcohol and a fatty acid and (J) an ester of a polyhydric alcohol and a fatty acid, and an average of 0 mol per 1 mol of the ester. 2 to 4 carbon atoms less than 12 moles
Compounds selected from the group consisting of alkylene oxide addition esters having an AO group are preferred.

Further, the polyhydric alcohol constituting the compounds (I) and (J) has a total carbon number of 2 which may contain an ether group.
-24 are preferred, and 2-14 valent alcohols are more preferred, 2-8 valent alcohols are more preferred, and 3-6 valent alcohols are particularly preferred. The dihydric alcohol has a total carbon number of 2 to 10, which may include an ether group, such as propylene glycol, dipropylene glycol, butylene glycol,
Examples thereof include dibutylene glycol, ethylene glycol, diethylene glycol, polyethylene glycol and the like. As the trivalent or higher alcohol, an alcohol having a total carbon number of 3 to 24, which may have an ether group, and having a total number of hydroxyl groups / total carbon number of 0.4 to 1 in one molecule, for example, glycerin, poly Glycerin (average degree of condensation 2-5), pentaerythritol, dipentaerythritol, arabitol, sorbitol, stachyose, erythritol,
Examples include arabite, mannitol, glucose, sucrose and the like. Particularly preferred is ethylene glycol, diethylene glycol, propylene glycol, or an alcohol having a total carbon number of 3 to 12 which may have an ether group, and having a valence of 3 or more and having a hydroxyl number in one molecule / total carbon number = 0.5 to 1. It is alcohol. More preferred are glycerin, polyglycerin (average degree of condensation 2 to 4), and pentaerythritol.

The fatty acids constituting these esters include fatty acids having 1 to 24 carbon atoms, preferably 10 to 22 carbon atoms, which may be saturated, unsaturated, straight chain or branched chain, and particularly straight chain. Chain fatty acids are preferred. More preferably, lauric acid, myristic acid, palmitic acid, stearic acid,
Oleic acid and behenic acid.

These esters can be obtained by performing known esterification reaction and AO addition reaction. For example, if necessary, an esterification catalyst is added to a mixture of a fatty acid and a polyhydric alcohol, and an ester is obtained by reacting at 150 to 250 ° C. Further, AO having 2 to 4 carbon atoms is added in the presence of an alkali catalyst or the like. By the addition, an alkylene oxide addition ester is obtained. Further, esterification may be performed after adding AO to the fatty acid or the polyhydric alcohol. Further, it may be obtained by only adding AO to the fatty acid.

The ester average degree of substitution of this ester is preferably 10 to 95 equivalent% of OH in the alcohol per 1 mol of the polyhydric alcohol, and particularly preferably 1 per 1 mol of the polyhydric alcohol. It has about 2 mol of ester groups.

When the alkylene oxide addition ester is used, the number of addition moles of AO is more than 0 moles and less than 12 moles on average per mole of the ester, preferably 0.1 to 6 moles. When a polyhydric alcohol capable of becoming an AO group such as ethylene glycol is used, these also
Included in the number of AO groups. AO is preferably EO and PO. They are
Either EO or PO alone or a mixture of EO and PO may be used. In the present invention, it is particularly preferable to use an ester of a polyhydric alcohol containing no AO group and a fatty acid.

The smoothness and air permeability improving agent of the present invention may be added as a liquid product as it is, but may be added as a solid product after pulverization, heating and melting, or diluted with water or the like.
Also, if necessary, nonionic, anionic, cationic,
An amphoteric surfactant may be used as an emulsifier or dispersant for the smoothness and air permeability improving agent. Anionic or cationic surfactants are preferable, and the following are more preferable. Higher fatty acid salts such as stearic acid, oleic acid, palmitic acid, myristic acid, lauric acid, rosin acid and tall oil fatty acid sodium salts, potassium salts and ammonium salts. Higher alcohol sulfate salts such as sodium, potassium and ammonium salts of lauryl sulfate, myristyl sulfate, palmityl sulfate, stearyl sulfate and oleyl sulfate. -Alkylbenzene sulfonates, such as linear sodium dodecylbenzene sulfonate and branched sodium dodecylbenzene sulfonate. -Sulfosuccinic acid diester salts such as sulfosuccinic acid di-2-ethylhexyl ester sodium salt, sulfosuccinic acid diisotridecyl ester sodium salt, and sulfosuccinic acid dicyclohexylsulfosuccinic acid. -Naphthalene sulfonate-formaldehyde condensate-Polycarboxylic acid salts such as sodium, potassium, calcium and ammonium salts of polyacrylic acid, polymethacrylic acid and polymaleic acid, or acrylic acid, methacrylic acid,
Sodium salt, potassium salt, calcium salt, ammonium salt and the like of a copolymer of two or more selected from the group of maleic acid and styrene. -Quaternary ammonium salts such as lauryl trimethyl ammonium, cetyl trimethyl ammonium, stearyl trimethyl ammonium and distearyl dimethyl ammonium hydrochloride.

In that case, the ratio of the smoothness and air permeability improving agent of the present invention to the surfactant is such that the smoothness and air permeability improving agent of the present invention / surfactant = 99.9 / 0.1 to 70/30 (weight ratio ), Preferably 99.8 / 0.2 to 80/20.

The smoothness and air permeability improving agent of the present invention is a mechanical pulp such as thermomechanical pulp (TMP), LBK.
It can be widely applied to virgin pulp such as chemical pulp such as P and pulp raw material such as waste paper pulp. When the used paper pulp is blended, the blending amount thereof is preferably 10% by weight or more, more preferably 30% by weight or more in the raw material pulp.

The smoothness and air permeability improving agent of the present invention is added at any time before the paper making step (internal addition). As the place of addition, before the papermaking process in which the diluted liquid of pulp raw material is drained while traveling on the wire mesh to form the paper layer, a disintegrator or beater such as pulper or refiner, a machine chest, a headbox or white water. It may be added to a tank such as a tank or a pipe connected to these facilities, but it is desirable to add it in a refiner, a machine chest, a head box, or the like so that it can be uniformly blended with the pulp raw material. After the smoothness and air permeability improving agent of the present invention is added to the pulp raw material, it is preferable that the paper is directly made and remains in the pulp sheet for the most part.

At the time of papermaking, a sizing agent, a filler, a retention improver, a drainage improver, a paper strength improver and the like may be added. In particular, in order for the smoothness and air permeability improving agent of the present invention to exhibit its function, it is important to fix to the pulp, and therefore, it is preferable to add an agent that promotes fixing. Aluminum sulfate is used as a fixing accelerator.
Examples include cationized starch, compounds having an acrylamide group, polyethyleneimine, and the like. The amount of the fixing promoting agent added is 0.01 to 5 with respect to 100 parts by weight of the pulp raw material.
Parts by weight are preferred.

The smoothness and air permeability improving agent of the present invention is 0.01 to 10% by weight, more preferably 0.1 to 5% by weight, based on the pulp raw material.
It is particularly preferable to add 0.1 to 2% by weight.

[0039]

EXAMPLES In the examples, "parts" means "parts by weight" and "%" means "% by weight" unless otherwise specified. [1] Pulp sheet smoothness test method Measured according to JIS P 8119 under conditions of 20 ° C. and 65% RH. The larger the smoothness value, the higher the smoothness. [2] Air permeability test method of pulp sheet Measured according to JIS P 8117 under conditions of 20 ° C. and 65% RH. The smaller the value of air permeability, the higher the air permeability.

Example 1 As the raw material pulp, deinked waste paper pulp (BDIP, whiteness 67
%, Csf 220 ml) 40% and LBPK (csf 550 ml) 60% were used in the pulp, and the smoothness and air permeability improver shown in Table 1 was used.
5%, light calcium carbonate as a filler (TP-121 6S: Okutama Kogyo Co., Ltd.) 8%, AKD as an internal sizing agent (AS-262: Japan
PMC) 0.05%, cationized starch CATO302 (Nippon NSC) 0.5%, PAM paper strength enhancer Hermide EX-360 (Harima Kasei) 0.1% were added. A retention aid (RD810: Nippon PMC Co., Ltd.) was added at 100 ppm, and the paper was made at 800 m / min with a twin wire paper machine. At this time, a surface sizing agent (100 parts of oxidized starch, 0.5 parts of acrylic surface sizing agent, 0.05 parts of salt) was applied on both sides with a size press at 0.6 g / m ^{2 on} each side, and the basis weight was 66
A g / m ² paper was obtained. The evaluation tests [1] and [2] above were performed on this paper. Further, as Comparative Example 1, the same paper was manufactured without using the smoothness and air permeability improving agent, and the same evaluation was performed. The results are shown in Table 1.

[0041]

[Table 1]

[0042]

[Chemical 4]

Compound D: 4.5 g of pentaerythritol stearate (ester average substitution degree 45 equivalent%) and 0.5 g of sodium dodecyl sulfate were added to 95 g of warm water at 70 ° C., and the mixture was stirred and homogenized for 1 hour at 25 ° C. A dispersion with an effective content of 5% prepared by leaving it in place. Compound E: 4.0 g of pentaerythritol stearate (ester average substitution degree: 45 equivalent%) and 1.0 g of cetyltrimethylammonium hydrochloride were added to 95 g of warm water at 70 ° C., and the mixture was homogenized with stirring and then at 25 ° C. for 1 hour. Dispersion liquid with an effective content of 5% prepared by standing.

Example 2 A pulp containing 100% LBKP (csf 500 ml) was used as a raw material pulp, and No. 1 in Table 1 was used as a smoothness and air permeability improving agent.
Using 0, paper was obtained in the same manner as in Example 1, and the above [1] [2]
Was evaluated. Further, as Comparative Example 2, the same paper was produced without using the smoothness and air permeability improving agent No. 10, and the same evaluation was performed. The results are shown in Table 2.

[0045]

[Table 2]

Example 3 As raw material pulp, deinked bleached waste paper pulp (BDIP, whiteness 67
%, Csf 220 ml) 40% and LBPK (csf 550 ml) 60% were used in the pulp, and the smoothness and air permeability improving agent No. 10 in Table 1 was used.
0.5%, kaolin (made in Indonesia) as a filler 10
%, Rosin emulsion sizing agent (A
L100: Nippon PMC Co., Ltd.) 0.5%, aluminum sulfate 2%, and polyacrylamide paper strength enhancer Hermide EX-360 (Harima Kasei Co., Ltd.) 0.1% were added. Yield improver (RD810: Japan PM
(Company C) was added in an amount of 100 ppm, paper was obtained in the same manner as in Example 1, and the evaluation tests [1] and [2] were performed. Further, as Comparative Example 3, the same paper was produced without using the smoothness and air permeability improving agent No. 10, and the same evaluation was performed. The results are shown in Table 3.

[0047]

[Table 3]

(Results) From the results shown in Tables 1 to 3, it is understood that the smoothness and air permeability of the pulp sheet obtained by the addition of the smoothness and air permeability improver of the present invention are improved. .

[0049]

According to the present invention, there is provided a smoothness and air permeability improving agent capable of improving both smoothness and air permeability required for printing paper. Further, according to the smoothness and air permeability improving agent of the present invention, a pulp sheet having both improved smoothness and air permeability can be obtained.

─────────────────────────────────────────────────── ─── Continuation of front page (56) References Patent 3283246 (JP, B2) Patent 3283248 (JP, B2) Patent 2971447 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) D21H 11/00-27/42

Claims (3)

(57) [Claims] 1. A compound having a water separation degree of 4% or more, defined below, and any one of the following (i) to (iii):
An agent for improving the smoothness and air permeability of a pulp sheet, which is composed of a compound having one or more paper quality improving effects and is added before the papermaking step. (I) Standard bulk improvement is 0.02 g / cm ³ or more (ii) Standard whiteness improvement is 0.5 points or more (iii) Standard opacity improvement is 0.5 points or more Water separation (%) = (α ₀ -α) / Α ₀ × 100 α: Pulp 100 is used as a compound to improve smoothness and air permeability.
Moisture content of wet sheet obtained by paper making by adding 5 parts by weight to weight part α ₀ : Moisture content of wet sheet obtained by paper making without adding a compound as a smoothness and air permeability improving agent to pulp 2. The compound is (A) an organosiloxane, (B)
Glyceryl ether, (C) amide, (D) amine, (E) amine acid salt, (F) quaternary ammonium salt, (G) imidazole,
(H) alcohol or alkylene oxide adduct thereof,
(I) an ester of a polyhydric alcohol and a fatty acid, and (J) an ester of a polyhydric alcohol and a fatty acid, which has an average of more than 0 moles and less than 12 moles of carbon 2 per mole of the ester compound.
The smoothness and air permeability improving agent according to claim 1, which is selected from the group consisting of esters having an oxyalkylene group of 4 to 4. 3. The smoothness and air permeability improving agent according to claim 1, further comprising one or more compounds selected from (a) anionic surfactant and (b) cationic surfactant.