JPS62125095A - Paper coating lubricant and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to paper coating lubricants. Specifically, the invention relates to a lubricant used in a paper coating material mainly consisting of a pigment and a binder. Conventionally, higher fatty acid metal salts have been used as lubricants for paper coating. Higher fatty acid amides, wax emulsions, polyethylene glycols, polyethylene glycol esters, liquid hydrocarbon oil emulsions, polyethylene dye versions and aliphatic sulfated oils have been used. However, these lubricants have the disadvantage that when calendering offset paper, gravure paper, etc., the release effect and dusting prevention effect during the process are weak, and stains occur on the surface of the calender roll. Particularly in the production of coated paper that uses a weak binder or coated paper with a low binder level, such as gravure paper, these lubricants are completely insufficient to prevent dusting during the process, and supercalenders cannot be used. Significant dunning occurs and the calender often has to be stopped to clean the calender roll surface. Increasing the amount of lubricant added can reduce the amount of dunning to some extent, but on the other hand, it also reduces the coefficient of friction of the coated paper, resulting in problems such as paper winding due to excessive slippage of the paper, or ease of sheet-feeding during sheet-fed printing. There is a limit to the addition of large amounts of lubricant as it may cause problems. Furthermore, these lubricants have the disadvantage that they have little effect on improving the print gloss of coated paper. In recent years, sucrose higher fatty acid NTE/L/ (Unexamined Japanese Patent Publication No. 52-55
Higher fatty acid entels such as 707) and aqueous emulsions of higher fatty acid dimers (Japanese Patent Application Laid-Open No. 56-65074) have been reported as anti-blocking agents or anti-danuteing agents, but like the lubricants mentioned in n7J, they do not release easily. The mold effect, dust prevention effect, and print gloss improvement effect are all insufficient, and it cannot solve the drawbacks of conventional lubricants.Furthermore, in gravure printing, it has the drawback of increasing the halftone missing rate. . The inventors of the present invention have found that compared to conventional lubricants, it has superior mold release effect and anti-dusting effect in one calendering process, exhibits these effects with a lower additive amount than conventional lubricants, and also has the effect of improving printing gloss. The present invention was achieved as a result of repeated research to develop a lubricant having the following properties. The present invention has the general formula R-C-0-w...[I
] (In the formula, R represents an alkyl group or alkenyl group having 3 or more carbon atoms, or an alkyl group or alkenyl group having a hydroxyl group, and R/ represents an alkyl or alkenyl group having 4 or more carbon atoms. However, the number of carbon atoms in R and R' A lubricant for paper coating comprising an aqueous dispersion of an ester compound having a total of 15 or more. In the general formula [I], an alkyl group or an alkenyl group. Alternatively, R is an alkyl group or an alkenyl group having a hydroxyl group, and R is an alkyl group or an alkenyl group.
The number of carbon atoms in ' is usually 3 or more, R' is 4 or more, preferably R is 7 to 21. W is 8 to 22, more preferably 11 to 21, and R1 is 12 to 22. The total number of carbon atoms in R and R' is usually 15 or more, preferably 19 to
43, more preferably 23 to 43. If R is less than 3 carbon atoms, a/ is less than 4 carbon atoms, or the total number of carbon atoms in R' is less than 15, the lubricating effect may be insufficient.
It is not preferable because it does not have the effect of preventing the P-type effect, P-type effect, P-type effect, etc. Butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid,
Pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid. Pentadecanoic acid, palmitic acid, margaric acid. Nutearic acid, nonadecanoic acid, arachidic acid, behenic acid,
Saturated fatty acids such as lignoceric acid, cerotic acid and montanic acid, butenoic acid, pentenoic acid/hexenoic acid, heptenoic acid, octenoic acid, nonenoic acid. Decenoic acid, undecenoic acid, dodecenoic acid, tridecenoic acid,
Tetradecenoic acid, pentadecenoic acid, hexadecenoic acid, octadecenoic acid, gadolenic acid and erucic acid, linoleic acid, linuric acid, stearolic acid natonounsaturated fatty acids, α-
unsaturated fatty acids having carbon rings, such as cyclohexyldecanoic acid and carboic acid; fatty acids having hydroxyl groups, such as 12-hydroxystearic acid and linoleic acid; and 2-ethylcaproic acid, isostearic acid. These are structural isomer fatty acids of the above saturated or unsaturated fatty acids such as oleic acid and elaidic acid. Among these fatty acids, preferable ones have 8 to 2 carbon atoms.
2 fatty acids, more preferably 12 to 2 carbon atoms.
2 straight chain saturated fatty acids such as lauric acid, myrinutic acid, valmitic acid, stearic acid and behenic acid. Further, 几 may be a residue of a carboxylic acid anhydride or a carboxylic acid halide, such as caprylic anhydride or stearic anhydride. Saturated and unsaturated fatty acid anhydrides such as oleic anhydride, caprylic acid chloride, palmitic acid bromide,
Examples include saturated and unsaturated fatty acid halides such as stearic acid chloride and oleic acid chloride. These carboxylic acids, carboxylic acid anhydrides, and carboxylic acid halides can be used alone or in a mixture of two or more. In addition to the above-mentioned carboxylic acids, carboxylic acids having an aromatic group such as benzoic acid and ω-phenylcapric acid, halogenated fatty acids such as chlorinated stearic acid, etc. may be used in combination. R' is usually a residue of a saturated or unsaturated alcohol having 4 or more carbon atoms, such as the following alcohols. butyl alcohol, amil alcohol, hekinal alcohol
LE, HEPTILE AL COLE,
Alcohol, nonyl
al cole, te siru al cole
Le. undesil alcol, lauriru alcol, triten
Le ale col − le, milli nu chile.
Alcohol, pentadecyl alcohol, stearyl alcohol, eicosyl alcohol and behenyl alcohol. Saturated aliphatic alcohols such as 2-undenelutetradecyl alcohol, dodecenol, phyceteryl alcohol, somaryl alcohol
unsaturated alcohols such as gadleyl alcohol and 1-tocosenol, alcohols with carbon rings such as cyclohexanol, and 2-ethylhexyl alcohol;
isotridecy)V alcohol, see -
) riff'sil al call,
These include structural isomer alcohols of the above saturated and unsaturated aliphatic alcohols such as iso-stearyl alcohol and 2-octadecenyl alcohol. Among these aliphatic alcohols, preferred are aliphatic alcohols having 8 to 22 carbon atoms, and more preferred are saturated aliphatic alcohols having 12 to 22 carbon atoms, lauryl alcohol, and isotridecyl alcohol. Alcohol, Milinutyl Alcohol, Cetyl Alcohol, Nutearyl Alcohol and Behenyl Alcohol. The emulsifying dispersant used for emulsifying and dispersing the ester compound includes at least one nonionic surfactant selected from polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ether, or polyoxyethylene alkyl ester, and a nurphonate salt. At least one type of anionic surfactant selected from type and sulfate salt type anionic surfactants. Polyoxyethylenealkylphenylnyf/V is usually 6 to 12 carbon atoms, preferably 7 to 10, more preferably 8 to 9 alkyl group-substituted phenol(V), and 4 to 70 moles of ethylene oxide, preferably 4 to 50 Mol,
More preferred are 5 to 25 mole adducts. Polyquine ethylene alkyl ether usually has 8 to 20 carbon atoms. Preferably 12 to 20 and more preferably 16 to 18 higher alcohols, 5 to 5 ethylene oxides
70 mol, preferably 13 to 50 mol, more preferably 22 to 45 mol of the adduct. The polyoxyethylene alkyl ester usually has 8 to 20 carbon atoms. Preferably 12 to 20, more preferably 16 to 18 higher fatty acids and the number of moles of ethylene oxide is usually 5 to 70. Preferably, mono- and dienethers consisting of polyethylene glycol having a molecular weight of 13 to 50°, more preferably 22 to 45° are mentioned. As the polyoxyethylene alkyl ester, a monoester having a small thickening effect is more preferable. Examples of the nurphonate type anionic surfactant include tetrapropylenebenzene nurphonate. Alkylbenzene sulfonates such as linear dodecylbenzene sulfonate and eicosylbenzene sulfonate, α-olefin sulfonate such as 1-hexadecene sulfonate, N-methy)v -N-oleyl taurine , di-2-ethylhexyl nurphosuccinate I
V Salt t,, r Dialkyl nulphosuccinate, tetradecyl nulphosuccinate. hexadecyl nurphonate and petroleum sulfonate tr
α-7/L/Fa fatty acid salts such as α-sulfolauric acid ethyl enether salt and dioctyl sulfosuccinate, ester-bonded sulfonates such as α-sulfolauric acid ethyl enether salt and dioctyl sulfosuccinate, holoxyethylene styrene Examples thereof include phenyl ether sulfonate and naphthalene sulfonate formalin condensate having a degree of condensation of 2 to 12. Ephthyl sulfate type anionic surfactants include, for example, alkyl sulfates such as nutearyl sulfate, sulfated oil salts such as sulfated castor oil, other polyoxyethylene alkyl ether sulfates, polyoxyethylene styrenated phenyl ether sulfates, and stearyl. Examples include aliphatic sulfates such as alcohol sulfates. Ammonium as sulfonate and sulfate salts;
Sodium, potassium, calcium, magnenium! Examples include amines such as jetanolamine. Among these anionic surfactants, preferred are linear dodecylbenzene nulphonate and alkylbenzene nulphonate. Alkyl sulfone M salts such as tetradecyl nurphonate, hexadecyl nurphonate and petroleum nurphonate + M now 2 to 10 naphthalene nurphonate formalin condensates and Nutea IJ/sulfate. As salts, ammonium, sodium and potassium salts are preferred. Salts of copolymers of α,β-unsaturated dibasic acids or their monoesters with styrene include, for example, maleic acid, fumaric acid, monomethyl maleate, monoisopropyl maleate, monobutyl maleate, and Examples include salts of copolymers of styrene and monoesters of maleic acid and ethylene glycol monobutyl ether. As the salt, an alkali metal or ammonium salt is usually preferred. The proportion of emulsifying dispersant used is the ester compound C11100.
The nonionic surfactant is usually 3 to 40 parts by weight, preferably 5 to 20 parts by weight, and the anionic surfactant is usually 01 to 10 parts by weight, preferably 0.2 to 5 parts by weight.
Parts by weight, more preferably 0.3 to 2 parts by weight. Further, in the case of a salt of a copolymer of .alpha.,.beta. unsaturated dibasic acid or its monoester and styrene, the amount is usually 2 to 30 parts by weight, preferably 3 to 20 parts by weight. The aqueous dispersion of the ester compound [1] is produced by heating and dissolving the ester compound CI at 60 to 150°C and dissolving the required amount of emulsifying and dispersing agent in water at a temperature of 60 to 100°C. Add it or heat it to 60-150℃ and melt it.
An emulsifying dispersant is mixed and dissolved in the ester compound CD in advance, and the mixture is poured into water at a temperature of 60 to 100°C.
It can be obtained by emulsifying and dispersing in a high-speed stirring emulsifier at 00° C. at 500 to 110,000 rpm or a piston-type high-pressure emulsifier at a pressure of 50 to 500 kg/cm and then cooling. The ester compound (r) can be synthesized by a conventional method. For example, in the case of fatty acid halides and aliphatic monohydric alcohols, the molar ratio is usually 1:1, and in the case of fatty acid anhydrides and aliphatic monohydric alcohols, the molar ratio is usually 1:1. In step 2, the dehydration or dehydrochlorination reaction may be carried out under a nitrogen atmosphere at 70 to 200°C until a desired esterification rate is reached. Hydrogen chloride and sulfuric acid are used to promote the esterification reaction. P-)/A catalyst such as reninsulfonic acid or boron trifluoride etherate may be used in combination, dehydration or dehydrochlorination may be performed under reduced pressure, or azeotropic dehydration may be performed using a solvent such as toluene or xylene. It's okay. The paper coating lubricant of the present invention contains antioxidants, ultraviolet absorbers,
Water resistance agent, preservative and fungicide, insecticide and fungicide 2 dispersant, antifoaming agent,
Deodorants, fragrances, fillers, dyes, pigments, and other lubricants may also be included or mixed therein. The paper coating lubricant of the present invention is used by being added to a paper coating coating material mainly containing a pigment and a binder. Examples of pigments include inorganic pigments such as clay, calcium carbonate, titanium oxide, satin white, barium sulfate, talc, and oxides, organic pigments such as Pranuchik pigment (polystyrene described in Japanese Patent Publication No. 46-6524), and combinations thereof. . As binders, natural binders, synthetic binders and mixtures thereof can be used. Natural binders include starch, modified starch, soy protein, casein; Synthetic binders include nutylene butadiene latex; acrylic resin emulsions, especially aqueous suspensions of polymers containing small amounts of copolymerized ethylenically unsaturated carboxylic acids. Liquid; butadiene and acrylonitrile, vinyl acetate and acrylate, butadiene and methyl methacrylate, copolymer of vinyl chloride and vinylidene chloride, butadiene, methyl methacrylate. Homogeneous polymers of vinyl acetate, chlorobrene, vinyl chloride and butyl methacrylate, as well as latexes of polymeric materials at least partially soluble in aqueous media, such as polyvinyl alcohol, may be mentioned. The amount of the paper coating lubricant of the present invention used (solid content: 1 pigment)
Usually 0.1 to 20 parts per 00 parts (weight parts, the same applies hereinafter)
parts, preferably 0.2 to 1o parts, more preferably O,
Parts a to 5. If the amount is less than 0.1 part, the mold release effect, dusting prevention effect and printing gloss improvement effect will be insufficient, and 2
If the amount is more than 0 parts, the coated paper will become too slippery, which is not preferable. The paper coating paint using the paper coating lubricant of the present invention is usually used in the form of an aqueous dispersion, and if necessary, other additives 2.
For example, dispersants (sodium pyrophosphate, sodium hegysametaphosphate, sodium polyacrylate, etc.), antifoaming agents (paraffin, ester phosphate, polyglycol, silicone compounds, etc.), leveling agents (urea, dicyandiamide, etc.), water retention agents, fluidity Modifiers (carboxymethylcellulose, sodium alginate, hydroxyethylcellulone, etc.), water resistance agents (urea-resin, melamine resin, glyoxal, etc.), preservatives (formalin, etc.), fluorescent dyes, etc. are added. Paper coating paints can be applied to paper substrates by known techniques 9, such as air knife coaters, trailing blade coaters, invert flade coaters, roll coaters, applicators, dried and optionally calendered or glued. The coating temperature for percalendering is usually 10 to 60°C. The drying temperature is usually 90 to 130°C. The temperature for calendering and nouvercalendering is 40 to 100°C. Paper of the present invention As for the coating lubricant, calendering has an extremely excellent mold release effect and dusting prevention effect during the process, and has a far superior mold release and dusting prevention effect compared to conventional lubricants such as calcium 7-tearate. In addition, by significantly reducing the amount added, the side-effect problem that cannot be avoided when using multi-layer additives to prevent dusting in conventional lubricants, that is, paper slippage due to excessive slippage, can be prevented. Problems such as poor sheet ejecting work during winding and sheet-fed printing, poor ink receptivity of coated paper, poor printing suitability such as reduced wet strength, or poor adhesiveness of coated white paperboard and poor suitability for blister packs. It also has the unprecedented effect of improving the printing gloss of coated paper, which could not be achieved with conventional lubricants.Furthermore, since no dusting occurs, it is possible to improve the printing gloss of coated paper. The lubricant for paper coating of the present invention can also be used as a sizing agent, and the amount added can be varied. However, it is usually 0.01 to 5% by weight (in terms of solid content) based on the pulp, preferably 0.0
It is 5 to 2% by weight, more preferably 0.1 to 1% by weight. The size of the paper is not particularly limited and can be applied to a wide range of base papers, can be used with or without treatment with a paper strength enhancer, and can be applied to paper made in a wide range of pH ranges. The method for using it is to add and mix the present wetting agent and fixing agent to a dispersion of beaten and dispersed pulp and a filler such as clay or coal, followed by papermaking. The lubricant of the present invention can also be used as a water-resistant agent for cement, gypsum board, etc. The present invention will be explained below with reference to Examples, but the present invention is not limited thereto. Example 1-9. +b Lubricant (A) 1230g of water in an emulsifier with a piston-type high-pressure emulsifier,
45 gr of 13 mole ethylene oxide adduct of octylphenol + 140 gr adduct of 14 mole ethylene oxide of lauryl sialic alcohol, 45 gr monoester of polyethylene glycol consisting of myristic acid and 70 mole ethylene oxide, )' sodium decylbenzene sulfonate 8 gr I Sodium naphthalene sulfonate formalin condensate with a degree of condensation of 5 mol 12
After adding gr and heating to 80°C to dissolve it uniformly,
1000 gr of 2-undecyltetradecyl alcohol heated to °C was added under stirring, and the pressure was 800 kg/C.
Emulsification was carried out using a piston-type high-pressure emulsifier at rIt, and the mixture was immediately cooled to 28°C. Concentration 50%, viscosity 800 cps
(25°C, the same applies hereinafter) White emulsified dispersion (Lubricant A
) was obtained. Lubricant CB) Add 1190g of water to the same emulsifier as in the example of lubricant (A).
l stearyl alcohol ethylene oxide 7 mo”
Add 90 g r of adduct + 14 mole adduct of ethylene oxide of lauryl sialic alcohol, 80 gr, sodium sulfosuccinate dihexyl ester, 15 gr, and sodium lauryl sulfonate, 5 gr, and heat to 70°C to uniformly dissolve, then heat to 120°C. 1000 gr of behenyl behenate was added under stirring and the pressure was 300 kg.
/a/l was emulsified using a piston type high pressure emulsifier and immediately cooled to 28°C. Concentration 50%, viscosity 150c
An emulsified dispersion of ps (lubricant B) was obtained. Lubricant (0) Add 1138g of water to the same emulsifier as in the example for lubricant (A).
+ 14 mole adduct of stearyl alcohol with ethylene oxide 85 gr + Lauric acid and ethylene oxide 18
Monoester with polyethylene glycol consisting of mol/
L/25 gr + 20 gr of 20 mole adduct of nonylphenol with ethylene oxide, 4 g of sodium naphthalene sulfonate formalin 111 compound with an average degree of condensation of 3
r, 4g sodium yohydrodecylbenzenesulfonate
Add r, heat to 80°C, and after uniformly dissolving, 120'
C! Nutearyl nutearate heated to 1000 gr
After stirring, emulsify with a piston-type high-pressure emulsifier at a pressure of 250 kg/Cd, immediately cool to 25°C, and reduce the concentration to 50.
H. White emulsified dispersion with a viscosity of 120 cps (Lubricant C)
I got it. Lubricant [D] Oleyl ole 1-10100O, uf in the high-speed stirring device
) 60 gr of 14 mole adduct of ethylene oxide of polyalcohol, 25 gr of adduct of 23 mole of stearyl alcohol oxide + monoester of polyethylene glycol consisting of stearic acid and 45 mole of ethylene oxide/L/40 gr, myristic acid and 23 mole of ethylene oxide Monoester IV with polyethylene glycol consisting of 25 gr + 10 gr of sodium petroleum sulfonate and 0.15 gr of potassium hydroxide 8
After mixing uniformly at 0°C, add 1160g of water at 80°C little by little, then stir at 8000 rp (71) at high speed, cool to 27°C, and mix at a concentration of 50 and a viscosity of 6 at 25°C.
A pale yellowish white emulsified dispersion (lubricant D) of 0 cps was obtained. Lubricant CE) ~ [J) Lubricant [D] ~ (I
- Got 1 D. The concentration in both cases was 50%. Now←The white emulsified dispersion of lauryl stearate with a viscosity of +05 cps is the lubricant [E], and the white emulsified dispersion of lauryl-12-hydroxystearate with a viscosity of 280 cps is the lubricant CF.
], viscosity of 2-butylhexyl stearate 90C
The white emulsified dispersion of pS is the lubricant [G], and the white emulsified dispersion of butyl stearate with a viscosity of 80 cps is the lubricant (H).
, viscosity of 2-ethylhexyl laurate 85 cps
The white emulsified dispersion of palmityl butyrate is the lubricant [I], and the white emulsified dispersion of palmityl butyrate with a viscosity of 80 cps is the lubricant [I].
J]. Lubricant [P] 1500g of water in an emulsifier with a piston-type high-pressure emulsifier,
Add 75g of ammonium salt of a copolymer of maleic acid monobutyl ester and styrene, heat to 80°C to dissolve uniformly, and then heat to 90°C for 1425g of lauryl stearate.
In step 2, emulsification was performed using a piston-type high-pressure emulsifier and the mixture was cooled to 30°C. A white emulsified dispersion (Pl was obtained) with a concentration of 50% and a viscosity of 60 cps. Comparative Examples 10 to 15 Lubricant 1-K) to EC)) Lubricant [J] to EC) under the same conditions as in Example 6 of Lubricant EC) [0
] was obtained. The concentration in both cases was 50%. An emulsified dispersion of methyl stearate with a viscosity of 210 CpS is a lubricant [J]
, an emulsified dispersion of lauryl acetate with a viscosity of 130 cps acts as a lubricant, and butyl caprylate with a viscosity of 75 cps.
The emulsified dispersion liquid of cps is lubricant (margin below C) (L), ゛Lubricant CM) 1130 gr of water is added to the same emulsifying device as in the example of lubricant [A].
, 120 gr of 9.5 mol ethylene oxide adduct of nonylphenol and sodium naphthalene sulfonate formalin a compound t with an average degree of condensation of 3. Add gr, heat to 70°C, uniformly dissolve, and then heat to 120°C.
1000 ethylene glycol dinutearate heated to
gr was added, stirred, and high-pressure emulsified at a pressure of sookg/cr/l. Immediately cooled to 10°C to obtain a concentration of 50 cm and a viscosity of 20.
A pale yellow-white emulsified dispersion (lubricant M) of 0 cps was obtained. Lubricant [N] A commercially available dispersion of calcium stearate at a concentration of 50% was used as the lubricant (N). lubricant

[0] In the production of an emulsified dispersion of lauryl stearate, only the anionic surfactants of sodium naphthalene sulfonate formalin condensate with a degree of condensation of 3 and sodium dodecylbenzene sulfonate in the example of lubricant [E] were omitted. After addition, emulsification was carried out in the same manner as in the example for lubricant (E), but the finished emulsion had a concentration of 50% and a viscosity of 15%.
000 cps, which solidified after one day and could not be used. The above-mentioned lubricants (A) to [I] of the present invention, lubricants (J) to (N) as comparative examples, and blanks (no additives) were added to the coating color, and coated papers obtained by supercalendering were Dusting prevention properties and coated paper properties were evaluated and the results are shown in Tables 1 and 2. The anti-dusting properties were evaluated using gravure paper prepared using a coating color prescription for gravure and offset paper prepared using a coating color prescription for offset. Coated paper properties were evaluated using offset paper. The gravure coating color is Yin 1 Pre-Dispersed Clay (EMC, UW
-g□) 45 parts, Nl112 Fretain Hearth Clay (EMO, HT Clay) 55 parts, polyacrylic acid soda dispersant (San Nopco ■, SN Dayne Persant 5040') 0.2 parts, sodium hydroxide 03
0.3 parts, carboxymethyl cellulose (Daiichi Kogyo Seiyaku ■, Celogen PR), carboxyl-modified styrene-butadiene copolymer latex (Japan Synthetic Rubber, JSR0)
628) 62 parts of solid content consisting of 8 parts and 0 to 1 part of lubricant,
This is a color PH9,0,0 paper coating dispersion. The coating color for offset is 70 parts of NNL pre-dispersed clay (same as above), light calcium carbonate (Okutama Kogyo ■, Tamapa) v TP-222H) 1
5 parts 1 heavy carbonate μsium (Sankyo Seifun Kako (Sake, Niscalon "1500'> 15 parts, sodium polyacrylate dispersant (same as above) 0.2 parts, oxidized starch (Japan Food Processing ■, MS-3800) 5 parts, carboxy-modified styrene-butadiene copolymer latex (Japan Synthetic Rubber ■, JSR-0692) 12 parts, solid content 62% consisting of 0 to 1 part lubricant, paper coating with color pH 9.0 It is a dispersion for gravure paper.All amounts in the coating color are parts by weight in terms of solid content.This dispersion for paper coating is applied to medium-quality paper with a basis weight of 65 gr/m' in the case of gravure paper, and offset. In the case of paper, it was coated on high-quality paper using an edge coater.The coating amount was 12 gr/m2 for gravure paper and 16 gr/r for offset paper.
The dusting prevention property was evaluated by heating the obtained coated paper at a temperature of 70°C.
The roll was passed through a super calender at a linear pressure of 150 kg/CrrL, and the occurrence of dunning on the chilled roll surface was visually evaluated and expressed on a 10-point scale. For the 10-point method, 10 is the best, and the coated paper for measuring the physical properties of coated paper has a temperature of 50℃ and a linear pressure of 80 to 97℃.
The sample was super calendered at m and subjected to a test. As is clear from the results in Table 1, the paper coating lubricant of the present invention has an extremely excellent anti-danuting effect even when added in a small amount, and is also excellent in improving white paper gloss, especially printing gloss. It is. Table - Dusting prevention properties

Claims (5)

[Claims] (1) General formula▲There are mathematical formulas, chemical formulas, tables, etc.▼……〔
I] (In the formula, R is an alkyl group having 3 or more carbon atoms, an alkenyl group,
Alternatively, R' is an alkyl group or alkenyl group having a hydroxyl group, and R' is an alkyl group or alkenyl group having 4 or more carbon atoms, provided that the total number of carbon atoms of R and R' is 15 or more. ) A lubricant for paper coating consisting of an aqueous dispersion of an ester compound represented by: (2) The lubricant according to claim 1, wherein R in the general formula [I] is an alkyl group or alkenyl group having 7 to 21 carbon atoms, and R' is an alkyl group or alkenyl group having 8 to 22 carbon atoms. . (3) At least one nonionic surfactant selected from polyoxyethylene alkyl ether, polyoxyethylene alkyl ester, or polyoxyethylene alkyl phenyl ether, and a sulfonate salt type or sulfate ester salt type anionic surfactant. Claim 1 or 2 is characterized in that it is emulsified and dispersed with at least one kind of anionic surfactant selected from
Lubricants listed in section. (4) The lubricant according to claim 1 or 2, characterized in that the lubricant is emulsified and dispersed with a salt of a copolymer of α,β-unsaturated dibasic acid or its monoester and styrene. agent. (5) General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (In the formula, R is an alkyl group with 3 or more carbon atoms, an alkenyl group,
Alternatively, R' represents an alkyl group or alkenyl group having a hydroxyl group, and R' represents an alkyl group or alkenyl group having 4 or more carbon atoms. However, the total number of carbon atoms in R and R' is 15 or more. ) is stirred at high speed in the presence of a nonionic surfactant, an anionic surfactant, a salt of a copolymer of α,β-unsaturated dibasic acid or its monoester and styrene, and water. A method for producing a paper coating lubricant comprising an aqueous dispersion characterized by emulsification and dispersion using an emulsifier or a piston-type high-pressure emulsifier.