JP2000328490A - Sizing agent for making paper and method for sizing paper with the sizing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sizing agent which is used for making paper and has an excellent sizing effect, low foamability and excellent stability with the passage of time in a paper-making region of pH 5.5 to 9. SOLUTION: This sizing agent for making paper comprises (A) a rosin-based substance, (B) an emulsion dispersant, and water. The rosin-based substance A comprises a resin mixture of (A-2) a reinforced rosin with (A-1) a rosin ester obtained by the thermal reaction of (a) an alkenyl-substituted succinic acid, (b) a rosin and (c) a polyhydric alcohol, or (A-3) a reinforced rosin ester obtained by the thermal reaction of (c) the component and (d) an α,β-unsaturated carboxylic acid. The emulsion dispersant B comprises the aqueous dispersion of an anionic polymer obtained by the polymerization of (b-2) the monomer mixture of (1) a hydrophobic vinyl monomer with (2) an anionic vinyl monomer in the presence of (b-1) a rosin dispersant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sizing agent for papermaking and a method for sizing paper using the sizing agent.
An object of the present invention is to provide a papermaking sizing agent having excellent sizing effect, low foaming property and stability over time in the papermaking region of 5.5 to 9.

[0002]

2. Description of the Related Art As is well known, in the papermaking industry, an aqueous dispersion of rosin or fortified rosin (α, β-unsaturated acid adduct of rosin) or an alkali metal soap solution is used for water resistance (sizing) of paper. At the same time, if necessary, it is customary to use it together with a cationic or zwitterionic fixing aid polymer.

On the other hand, in recent papermaking technology, calcium carbonate is generally used as a filler for paper or a pigment for coating paper. When calcium carbonate is used as a filler, the pH at the time of papermaking is necessarily 6 or more. In addition, when paper using calcium carbonate as a coating pigment is mixed in the papermaking system as waste paper or waste paper,
Usually, the pH is 5.5 or more. When calcium carbonate is used as a filler, light (precipitating) calcium carbonate, which has higher alkalinity than heavy calcium carbonate, has recently been selected because the friction of the papermaking wire is small. .

In such a situation, an aqueous dispersion of rosin or fortified rosin or an alkali metal soap solution, which has been widely used in the past, is not effective for sizing paper. Therefore, alkyl ketene dimer (AKD) or A neutral sizing agent containing an alkenyl-substituted succinic anhydride (ASA) as an active ingredient has been used. However, AKD-based neutral sizing agents may impart slipperiness to the paper or may lower the toner fixability of the paper. Further, various stains generated in the paper making process when using AKD-based and ASA-based neutral sizing agents have not been completely solved.

Even when used under conditions of pH 5.5 or more, it is effective as a sizing agent which is effective for making the paper water-resistant and which does not cause any disadvantage such as an AKD-based or ASA-based neutral sizing agent. Sizing agent comprising a dispersion of modified rosin obtained by esterifying rosin with a tertiary amino alcohol
No. 161472), rosin or fortified rosin is 3 to
Sizing agent consisting of a dispersion of modified rosin reacted with a tetrahydric alcohol (Japanese Patent Publication No. 3-79480, Japanese Patent Publication No. 6-4954), a resin obtained by mixing a rosin substance with a hydrocarbon resin, alkenyl succinic acid, etc. (Japanese Patent Publication No. 57-5420, JP-A-7-17-1)
No. 89173). However, the sizing agent using the rosin-based substance disclosed in each of these publications exhibits a certain effect under the condition of pH 5.5 or more, but has a predetermined size as compared with the AKD-based and ASA-based sizing agents. In order to obtain the effect, it is necessary to increase the amount of the sizing agent, so that not only the cost is increased, but also the foaming and various stains during the paper making process are increased.

A water-based emulsion of rosin or rosin derivative comprising a copolymer (salt) of a hydrophobic monomer, a (meth) acrylic acid-based monomer and a sulfo group-containing monomer, which further improves the size effect, foaming property, and dirt trouble. Japanese Unexamined Patent Publication (Kokai) No. 1-20301), a sizing agent obtained by emulsifying and dispersing a rosin-based substance containing an ester with a polyhydric alcohol and a polyhydric phenol with a cationic (meth) acrylamide-based polymer having a hydrophobic group (Japanese Patent Laid-Open Publication No. No. 125693), a sizing agent obtained by emulsifying and dispersing a rosin-based substance with a (meth) acrylamide-based copolymer (JP-A-8-337997).
), A sizing agent obtained by emulsifying and dispersing a rosin-based substance such as a rosin ester with a copolymer of styrene, (meth) acrylic acid and a sulfonic acid-based monomer (JP-A-7-10936)
No. 0), a resin obtained by modifying a reaction product of a rosin and an alkanol tertiary amine with an α, β-unsaturated dibasic acid is used to prepare a resin comprising a cationic vinyl monomer, an aromatic vinyl monomer and a (meth) acrylate ester. There have been proposed sizing agents emulsified and dispersed with a copolymer (Japanese Patent Application Laid-Open No. 4-108196). There are still problems, and there is a strong demand in the papermaking industry for papermaking sizing agents that have excellent sizing effects, low foaming properties and stability over time under conditions of pH 5.5 or higher.

[0007]

DISCLOSURE OF THE INVENTION The inventors of the present invention have no disadvantages as in the case of using the conventional neutralizing agent for papermaking, and have excellent sizing effect and low foaming in the papermaking region of pH 5.5 to 9. The following inventions have been completed as a result of earnest studies as a technical task to provide a paper sizing agent having properties and stability over time and a paper sizing method using the same.

[0008]

The invention of claim 1 is a paper sizing agent comprising a rosin-based substance (A), an emulsifying dispersant (B) and water, wherein the rosin-based substance (A) is alkenyl. A mixed resin of a rosin ester (A-1) obtained by heating and reacting a substituted succinic acid (a), a rosin (b) and a polyhydric alcohol (c) with a reinforced rosin (A-2); a) component, (b) component, (c) component and α, β-
The emulsifying dispersant (B) comprises a reinforced rosin ester (A-3) obtained by heating and reacting an unsaturated carboxylic acid (d) with a hydrophobic vinyl monomer in the presence of a rosin dispersion (b-1). It consists of an aqueous dispersion of an anionic polymer obtained by polymerizing a monomer mixture (b-2) of (a) and an anionic vinyl monomer (b).

According to a second aspect of the present invention, the emulsifying dispersant (B) in the first aspect is used in the presence of 0.1 to 20 parts by weight of the rosin dispersion (b-1), and the hydrophobic vinyl monomer (a) 40 to 40 parts by weight. 80% by weight of anionic vinyl monomer (b) Papermaking size which is an aqueous dispersion of anionic polymer obtained by emulsion polymerization of 80 to 99.9 parts by weight of a monomer mixture (b-2) of 20 to 60% by weight The composition consists of an agent. Here, parts by weight,% by weight, and weight ratio are expressed in terms of concentration (hereinafter, the same is shown unless otherwise noted).

[0010] The invention of claim 3 has a constitution in which the rosin dispersion (b-1) in claim 1 or 2 is a papermaking sizing agent which is an aqueous dispersion comprising a rosin modified product, an emulsifier and water.

A fourth aspect of the present invention comprises a sizing agent for papermaking, wherein the rosin dispersion (b-1) according to the first to third aspects has an average particle size of 1 μm or less.

A fifth aspect of the present invention comprises a paper sizing method using the papermaking sizing agent according to the first to fourth aspects in a papermaking region having a pH of 5.5 to 9.

The rosin ester (A-1) in the present invention
Alternatively, the alkenyl-substituted succinic acids (a) used in the reinforced rosin ester (A-3) include internal olefins having 6 to 36 carbon atoms, ethylene oligomers, propylene oligomers and butylene oligomers, or a mixture thereof with maleic anhydride and And / or an addition reaction with maleic acid. Particularly preferred is an addition product of propylene tetramer having 12 to 15 carbon atoms and / or propylene pentamer and maleic anhydride.

The production of the alkenyl-substituted succinic acids (a) may be carried out according to a conventional method. For example, maleic anhydride and / or maleic acid are added to the olefins, and the olefins are added at 150 to 250 ° C. at 10 to 24 ° C. in an autoclave reactor. Obtained by reacting for hours.

Rosin ester (A-1) in the present invention
The rosins (b) used for the above include gum rosin, tall rosin, wood rosin, hydrogenated rosin, polymerized rosin,
(Alkyl) phenol-formalin resin modified rosin,
Various rosins such as xylene resin-modified rosin, aldehyde-modified rosin, and styrene-modified rosin are exemplified.

Rosin ester (A-1) in the present invention
Or, as the polyhydric alcohols (c) used in the fortified rosin ester (A-3), ethylene glycol, propylene glycol, butanediol, hexanediol, glycerin, trimethylolpropane, trimethylolethane, pentaerythritol, sorbitol, etc. These can be used alone or in combination of two or more.

The production of the rosin ester (A-1) may be carried out according to a conventional method. For example, alkenyl-substituted succinic acids (a), rosins (b) and polyhydric alcohols (c) may be prepared at 200 to 280 ° C. for 10 hours. Obtained by heating for ~ 24 hours.

The mixing ratio of the alkenyl-substituted succinic acids (a) and the rosins (b) in the rosin ester (A-1) is (a) :( b) = 1: 99 to 20:80 parts by weight, preferably ( a) :( b) = 3: 97 to 10:90 parts by weight. The ratio of the hydroxyl equivalent of the polyhydric alcohol (c) to the total carboxyl equivalent of the alkenyl-substituted succinic acids (a) and the rosins (b) is 0.2 to 1.5, more preferably 0.7 to 1. It is obtained by a heating reaction at a charging ratio of 0.0.

The reinforced rosin (A-2) in the present invention is obtained by adding an α, β-unsaturated carboxylic acid (d) to the rosin (b). Α used here,
Representative examples of the β-unsaturated carboxylic acids (d) include fumaric acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, unsaturated dibasic acids such as citraconic anhydride, acrylic acid, methacrylic acid and the like. And the like, and these may be used alone or in combination of two or more. The α, β-unsaturated carboxylic acid (d) to be added is 5 to 20% by weight, more preferably 10 to 17%, based on the rosin (b).

The production of the fortified rosin (A-2) may be carried out according to a conventional method. For example, the rosin (b) and α, β
-Unsaturated carboxylic acids (d) at 180-250 ° C
Obtained by heating for 5 hours.

Rosin ester (A-1) in the present invention
And the compounding ratio of the fortified rosin (A-2) is (A-1):
(A-2) = 10: 90-80: 20 parts by weight, preferably (A-1) :( A-2) = 30: 70-60: 40 parts by weight.

The fortified rosin ester (A-
The production of 3) may be performed according to a conventional method. For example, after the alkenyl-substituted succinic acids (a), rosins (b) and polyhydric alcohols (c) are heated and reacted at 200 to 280 ° C. for 10 to 24 hours, α, β-unsaturated carboxylic acids (d)
May be added and reacted at 180 to 250 ° C. for 1 to 5 hours. After reacting the rosins (b) with α, β-unsaturated carboxylic acids (d) at 180 to 250 ° C. for 1 to 5 hours,
The alkenyl-substituted succinic acids (a) and the polyhydric alcohols (c) may be added and reacted at 200 to 280 ° C. for 10 to 24 hours, and the alkenyl-substituted succinic acids (a), rosins (b), and polyhydric alcohols may be added. (C) and α, β-unsaturated carboxylic acids (d) were simultaneously charged, and 200 to 280
You may make it react at 10 degreeC for 10 to 24 hours.

The compounding ratio of the alkenyl-substituted succinic acids (a) and the rosins (b) in the fortified rosin S (A-3) is (a) :( b) = 0.5: 99.5 to 10: 9.
0 parts by weight, preferably (a) :( b) = 1.5: 98.
5 to 5:95 parts by weight. The ratio of the hydroxyl equivalent of the polyhydric alcohol (c) to the total carboxyl equivalent of the alkenyl-substituted succinic acids (a) and rosins (b) is 0.2 to 1.5, preferably 0.4 to 0.8. Wherein the α, β-unsaturated carboxylic acid (d) to be added is 2 to 15% by weight, preferably 5 to 10%, based on the rosin (b).
% By a heating reaction at a charging ratio of 0.1%.

[0024] In addition to the mixed resin, fortified rosin ester of such an extent not to impair the effect in rosin esters of the present invention (A-1) and fortified rosin (A-2) (A- 3), C 5 or more fatty A petroleum resin or wax obtained by polymerizing a group III residual olefin may be used.

The emulsifying dispersant (B) in the present invention is prepared by mixing a hydrophobic vinyl monomer (a) and an anionic vinyl monomer (b) in a monomer mixture (b-2) in the presence of a rosin dispersion (b-1). Is a polymer obtained by polymerizing a rosin dispersion (b-1) in the presence of 0.1 to 20 parts by weight of a hydrophobic vinyl monomer (a) 40 to 80% by weight of an anionic vinyl monomer ( B) An aqueous dispersion of an anionic polymer obtained by emulsion polymerization of 80 to 99.9 parts by weight of 20 to 60% by weight of a monomer mixture (b-2). Still more preferably, rosin dispersion liquid (b-1) 3 to
Emulsion polymerization of 85 to 97 parts by weight of a monomer mixture (b-2) of 40 to 80% by weight of a hydrophobic vinyl monomer (a) and 20 to 60% by weight of an anionic vinyl monomer (b) in the presence of 15 parts by weight It is an aqueous dispersion of the resulting anionic polymer.

The rosin dispersion (b-1) used for the emulsifying dispersant (B) in the present invention includes the rosins (b), rosin ester (A-1), and reinforced rosin (A-
2) A dispersion in which at least one resin selected from rosin-modified products such as reinforced rosin ester (A-3) is dispersed in water using an emulsifier.

As the emulsifier in the rosin dispersion liquid (b-1), various low molecular surfactants, high molecular emulsifiers / dispersants and protective colloids such as casein, polyvinyl alcohol and modified starch are used. Alternatively, two or more kinds may be used in combination. Examples of various low-molecular surfactants include, for example, alkali metal salts of fortified rosin, alkylbenzene sulfonates, polyoxyethylene alkyl ether sulfates, alkylnaphthalene sulfonates, and polyoxyethylene alkyl ether sulfosuccinate monoesters. , Polyoxyethylene alkyl phenyl ether sulfosuccinic acid monoester salts, anionic surfactants such as polyoxyethylene mono- and distyryl phenyl ether sulfosuccinic acid monoester salts, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxy Ethylene mono and distyryl phenyl ether, propylene glycol fatty acid ester, fatty acid diethanolamide, polyoxypropylene polyoxyethylene glycol It can be exemplified a nonionic surfactant such Lumpur.

As the polymer emulsifying dispersant, a synthetic polymer having a hydrophobic group, a nonionic group or an ionic group or a general natural polymer emulsifying dispersant can be used. (Meth) acrylic acid- (meth) acrylate copolymer (salt), styrene- (meth)
Acrylic acid-based copolymer (salt), (meth) acrylamide-carboxyl group-containing monomer-sulfonic acid group-containing monomer- (meth) acrylic ester-based copolymer (salt),
Anionic copolymers such as (meth) acrylic acid- (meth) acrylic acid ester copolymers, amino group-containing monomer copolymers of styrene- (meth) acrylic acid esters (quaternized), (meth) acrylic acid Cationic copolymers such as ester- (meth) acrylate-containing amino group-containing monomer copolymers (quaternized), and (meth) acrylamide-carboxyl group-containing monomers-amino (meth) acrylate Examples include amphoteric copolymers such as a group-containing monomer-sulfonic acid group-containing monomer copolymer (salt or quaternary compound). Among these, a styrene- (meth) acrylic acid- (meth) acrylic acid ester-based copolymer (salt) is preferable.

The rosin dispersion (b-1) used in the emulsifying dispersant (B) of the present invention has an average particle diameter of 1 μm or less,
Preferably it is 0.5 μm or less.

The hydrophobic vinyl monomer (A) used in the emulsifying dispersant (B) in the present invention includes an alkyl group such as ethyl (meth) acrylate, methyl (meth) acrylate and butyl (meth) acrylate. Styrenes such as (meth) acrylates having 1 to 20 carbon atoms, styrene, α-methylstyrene and the like, and monomers of styrene compounds containing an alkyl group having 1 to 4 carbon atoms in the aromatic ring of these styrenes , Vinyl acetate, vinyl carboxylate such as vinyl propionate, α-olefin having 6 to 22 carbon atoms,
Examples thereof include alkyl vinyl ethers having 1 to 22 carbon atoms and vinyl pyrrolidone, and these may be used alone or in combination of two or more. Of these, styrene and (meth) acrylic acid ester are particularly preferred in terms of emulsifiability.

Examples of the anionic vinyl monomer (b) used in the emulsifying dispersant (B) include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid, and / or Alkali metal salts such as potassium salt and sodium salt, ammonium salts, styrenesulfonic acid (salt), vinylsulfonic acid (salt), 2- (meth) acrylamido-2-methylpropanesulfonic acid (salt), (meth) acrylic Sulfonic acid (salt) monomers such as sulfoethyl acid (salt) and (meth) allyl sulfonic acid (salt), sulfate (salt) of hydroxypropyl (meth) acrylate, sulfate of hydroxyethyl (meth) acrylate ( Salt), polyoxyalkylene (meth) acrylate sulfate (salt), polyoxyethylene Rukirupuro Bae sulfo group-containing monomer and / or a salt such as sulfuric ester (salt) -based monomer such as sulfuric acid ester (salt) of vinyl ether and the like, can be used in combination or these alone or in combination. Among these, acrylic acid, methacrylic acid, maleic anhydride, styrene sulfonic acid, and 2- (meth) acrylamido-2-methylpropanesulfonic acid are more preferable.

The monomer mixture of the emulsifying dispersant (B) (b-
The composition ratio of the hydrophobic vinyl monomer (a) and the anionic vinyl monomer (b) in 2) is (b) :( b) =
40:60 to 80: 20% by weight, preferably (a):
(B) = 50: 50 to 70: 30% by weight. (I)
When the amount of the component is less than 40% by weight or the amount of the component (b) is less than 20% by weight, the emulsifiability deteriorates, so that the particle size of the sizing agent increases, and the sizing effect and the stability with time deteriorate.
When the amount of the component (a) exceeds 80% by weight, the content of the anionic vinyl monomer (b) decreases, and the particle size of the sizing agent increases. When the component (b) exceeds 60% by weight, the foamability increases.

The weight ratio of the rosin dispersion (b-1) to the monomer mixture (b-2) in the emulsifying dispersant (B) is (b-1) :( b-2) = 0.1: 99. 9-2
0:80, preferably (b-1) :( b-2) = 1: 9
9 to 10:90.

The emulsifying dispersant (B) in the present invention is prepared mainly by an emulsion polymerization method. In the case of the emulsion polymerization method, various surfactants may be used in addition to the rosin dispersion liquid (b-1). For example, the nonionic surfactant and the polymer emulsifying dispersant described in the above [0027] And the like, and these can be used alone or in combination of two or more. The amount used is 0.5 to 10 with respect to the total
% By weight.

The polymerization initiator used in the above polymerization method is not particularly limited, and various known ones such as persulfates, peroxides, azo compounds and redox initiators can be used, and also known for adjusting the molecular weight. Isopropyl alcohol, carbon tetrachloride, cumene, thioglycolic acid ester, alkylmercaptan, 2-mercaptoethanol, 2,4-diphenyl-4-methyl-1-pentene, etc., which are the chain transfer agents described above.

The weight average molecular weight of the anionic polymer which is the emulsifying dispersant (B) in the present invention is directly correlated with the emulsifying property of the rosin-based substance.
0 to 500,000, more preferably 1,000 to 10
It is 0000. If it is less than 500, the stability over time of the emulsion will be poor, and if it exceeds 500,000, the product viscosity will be high.

The method for producing the paper-making sizing agent according to the present invention comprises:
Although not particularly limited, for example, Japanese Patent Publication No. 54-3
According to the method described in JP-A-6242, the component (A-1) and the component (A-2), or the component (A-3)
A method of dissolving the components with a solvent (for example, benzene, toluene, methylene chloride, etc.), adding the emulsifying and dispersing agent (B), and then producing an oil-in-water emulsion through a homogenizer (solvent method); The component (A-1) and the component (A-2) are melt-mixed or the component (A-3) is melted in accordance with the method described in JP-A No. To form a water-in-oil emulsion, add inverted water to cause a phase transition to an oil-in-water emulsion (phase inversion method),
According to the method described in JP-A-32380, the component (A-1) and the component (A-2) are melt-mixed or the component (A-3) is melted, and the emulsifying dispersant is further added. After mixing (B), a method (mechanical method) of producing an oil-in-water emulsion through a homogenizer under high temperature and high pressure is used.

In the solvent method, the phase inversion method, and the mechanical method, a surfactant and sodium hydroxide, potassium hydroxide,
An alkaline substance such as ammonia can also be added.
Examples of the surfactant include various surfactants used at the time of emulsion polymerization of the aforementioned anionic polymer.

In the solvent method, the phase inversion method, and the mechanical method, the emulsifying and dispersing agent (B) is used in an amount of usually 1 to 20% by weight based on the dry weight of the rosin-based material (A), more preferably. Is in the range of 8 to 15% by weight. If it is less than 1% by weight, the dispersing power is not sufficient, and if it exceeds 20% by weight, the foaming property becomes large.

The sizing agent for papermaking according to the present invention can exhibit excellent sizing performance by itself. However, known neutral sizing agents, such as epichlorohydrin-modified styrene-dimethylaminoethyl methacrylate copolymer and alkenyl anhydride Epichlorohydrin-modified succinic acid, alkyl ketene dimer, and fatty acid-polyalkyl polyamine condensate can be used in combination.

The sizing agent for papermaking according to the present invention has a pH of 5.
In addition to exhibiting excellent sizing effects when used in papermaking areas of 5 or more, the reduction in foaming properties that are problematic in papermaking and the stability over time due to machine dirt troubles are also improved. Satisfactory sizing effect is given to light calcium carbonate high-filled paper which cannot be expected to have sufficient sizing effect, and operational stability can be prevented by improving various stability.

The paper sizing method according to the present invention is characterized in that
In the manufacturing process of various papers and paperboards in the papermaking area of 5.5 to 9, it is carried out, for example, by adding the papermaking sizing agent according to the present invention to the wet end portion, and drying the pulp into an aqueous dispersion of pulp. The papermaking sizing agent according to the invention is present in an amount of 0.01 to 5%, more preferably 0.1 to 5% by weight.
Add 0.5 to 2%.

In the paper making step, a fixing aid and / or an aluminum salt such as aluminum sulfate is used according to a conventional method.

The filler used in the paper sizing method according to the present invention is not particularly limited, and any known filler can be used. In addition, calcium carbonate which cannot be used in the conventional acidic papermaking method is also suitable. Can be used for
There is an advantage that can greatly contribute to a reduction in papermaking price.

As the fixing agent used in the paper sizing method according to the present invention, known fixing agents used for neutral sizing agents such as alkyl ketene dimer and alkenyl succinic anhydride can be used as they are. Epichlorohydrin modified polyamide polyamine resin, epichlorohydrin modified dicyandiamide resin, epichlorohydrin modified styrene-dimethylaminoethyl methacrylate copolymer, Mannich modified polyacrylamide, acrylamide-dimethylaminoethyl methacrylate copolymer, Hoffmann polyacrylamide Decomposition products, copolymers of dialkyldiallylammonium chloride and sulfur dioxide and the like can be mentioned.
In addition, the sulfuric acid band used in the acidic papermaking method also has a papermaking pH.
It may be used to such an extent that it does not decrease to less than 5.5.

In the paper sizing method of the present invention, the papermaking pH is appropriately determined within the range of 5.5 to 9, and within this range, excellent sizing effect can be exhibited.

The sizing agent for papermaking according to the present invention comprises high quality paper,
The present invention can be applied to printing paper such as medium quality paper and coated paper, information paper such as PPC paper, foam paper, thermal paper, and pressure sensitive paper, packaging paper, cardboard base paper, white paperboard, and gypsum board raw paper. In addition to the production of cellulose fibers, when producing a mixture of cellulose fibers and mineral fibers, such as asbestos, rock wool, and synthetic fibers, such as polyamide, polyester, and polyolefin, to produce paper, paperboard, fiberboard, and the like. It can also be applied advantageously.

The paper-making sizing agent of the present invention can also be used as a surface sizing agent. In this case, the sizing agent can be applied to a wet paper made in advance by a conventional method such as spraying, impregnating or coating. .

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are as follows.

Production of alkenyl-substituted succinic acids (a): A predetermined amount of an olefin oligomer and maleic anhydride are charged into an autoclave reactor, and 150
After performing the reaction at ~ 250 ° C for 10 to 24 hours, vacuum distillation is performed,
A sticky alkenyl-substituted succinic anhydride was obtained.

Production of rosin ester (A-1): A prescribed amount of gum rosin, a prescribed amount of alkenyl-substituted succinic anhydride and glycerin in a reactor equipped with a stirrer, a thermometer, a distilling tube and a nitrogen introducing tube. And 200 under nitrogen flow
To 280 ° C and react at the same temperature for 10 to 24 hours,
Rosin ester (A-1) was obtained.

Production of fortified rosin (A-2): stirrer,
A predetermined amount of maleic anhydride is gradually added to a predetermined amount of gum rosin in a molten state at about 200 ° C. in a reactor equipped with a thermometer and a nitrogen inlet tube, and the mixture is heated at 180 to 250 ° C. under a nitrogen stream at 180 to 250 ° C.
An addition reaction was performed for 〜5 hours to obtain a reinforced rosin (A-2).

Production of fortified rosin ester (A-3):
A predetermined amount of the alkenyl-substituted succinic anhydride, gum rosin and glycerin was charged into a reactor equipped with a stirrer, a thermometer, a distilling tube, and a nitrogen introducing tube.
After heating to 0 ° C. and reacting at the same temperature for 10 to 24 hours, a predetermined amount of maleic anhydride was charged, and 180 to 180 ° C. under a nitrogen stream.
The reaction was carried out at 250 ° C. for 1 to 5 hours to obtain a reinforced rosin ester (A-3). As another method, the reaction order of the glycerin and the maleic anhydride was reversed to obtain a reinforced rosin ester (A-3). Further, as another method, the alkenyl-substituted succinic anhydride, gum rosin, glycerin and maleic anhydride are simultaneously charged, and
C. for 10 to 24 hours.
-3) was obtained.

Production of emulsifying dispersant (B): A predetermined amount of rosin dispersion (b-1), soft water, and hydrophobic vinyl monomer (a) were placed in a reaction vessel equipped with a stirrer, thermometer, cooling pipe, and nitrogen inlet pipe. ), An anionic vinyl monomer (b) and a chain transfer agent were charged, mixed and stirred, heated to an internal temperature of 50 ° C under a nitrogen stream, and then ammonium persulfate (APS) and sodium bisulfite (SBS) were used as radical polymerization initiators. The reaction mixture was heated to 80 ° C., reacted for 5 hours, cooled, and added with a predetermined amount of caustic soda to obtain an aqueous dispersion of an anionic polymer.

Production of a sizing agent for papermaking: a predetermined amount of a mixed resin of the rosin ester (A-1) and the reinforced rosin (A-2), or the reinforced rosin ester (A-3) in an amount of about 1
The mixture is heated and melted at 50 ° C., and with vigorous stirring, a predetermined amount of the emulsifying dispersant (B) is added thereto and mixed to form a water-in-oil emulsion. After forming an oil-type emulsion, it was cooled to room temperature to obtain a sizing agent for papermaking.

Evaluation of the performance of the sizing agent for papermaking: (1) Size effect test: A cationized starch was added to a pulp slurry (L-BKP, CSF 400 ml) at a concentration of 2.5% in terms of solid content based on absolutely dry pulp. 0%, aluminum sulfate is 0.3% in terms of solids with respect to the dry pulp, and light calcium carbonate is 1 in terms of solids with respect to the dry pulp.
0% and then bentonite were added to the absolutely dried pulp at 0.04% in terms of solid content, and paper was made using a TAPPI standard machine according to a conventional method. At this time, the pH of the pulp slurry was 7.4. Wet paper is 3.5kg / cm
After dehydration for 5 minutes under a pressure of ² and drying for 1 minute with a rotary drier at a temperature of 90 ° C., a paper having a basis weight of 60 g / m ² was obtained. After conditioning for 24 hours at a temperature of 20 ° C. and a humidity of 65%, the sizing degree of each formed paper was measured by the JIS P8112 Steicht method.

(2) Foaming test: 1000 ml of white water obtained by diluting the pulp slurry after adding each chemical to a concentration of 1% in the same manner as in the above (1) Size effect test and filtering through an 80 mesh wire mesh. It was circulated by a pump, and the volume of foam generated at that time was measured.

(3) Stability test with time: After placing 50 g of the sizing agent in a 100 cc transparent glass bottle and sealing the mixture, the mixture was allowed to stand in an electric dryer set at 80 ° C. for 3 weeks, and the presence or absence of a precipitate was observed. The evaluation criteria were as follows: ○ = no precipitate. Δ = There is a small amount of precipitate. × = There is a large amount of precipitate.

(4) Measurement of average particle diameter: The average particle diameter (μm) of the sizing agent was measured using an ultracentrifugal automatic particle size distribution analyzer (CAPA-700, manufactured by Horiba, Ltd.).

[0060]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Production Examples, Examples, and Comparative Examples, but the present invention is not limited to these Examples. In addition, in each example, parts and% are based on weight (concentration) unless otherwise specified.

Production of alkenyl-substituted succinic acids (a): [Production Example a-1] In an autoclave reaction vessel, 144 parts of a high-mass polymer (trade name: Nippon Oil Co., Ltd., propylene oligomer; carbon number 15), maleic anhydride After 68 parts of acid was charged and reacted at 200 ° C. for 24 hours under a nitrogen stream, vacuum distillation was carried out to obtain a sticky alkenyl-substituted succinic anhydride having an acid value of 230.

Production of rosin ester (A-1): [Production Example A-1-1] A reaction vessel equipped with a stirrer, a thermometer, a distilling tube, and a nitrogen introducing tube was prepared according to [Production Example a-1]. 25 parts of the obtained alkenyl-substituted succinic anhydride, 800 parts of gum rosin having an acid value of 170 and 80 parts of glycerin were charged, heated to 250 ° C. under a nitrogen stream, reacted at the same temperature for 24 hours, and reacted with a rosin ester having an acid value of 12. (A-1) was obtained.

Production of fortified rosin (A-2): [Production Example A-2-1] in a molten state at about 200 ° C. in a reaction vessel equipped with a stirrer, a thermometer, a distillation pipe, and a nitrogen introduction pipe. 800 parts of gum rosin was gradually charged with 104 parts of maleic anhydride, and subjected to an addition reaction at 200 ° C. for 5 hours under a nitrogen stream,
A reinforced rosin (A-2) having an acid value of 240 was obtained.

Production of fortified rosin ester (A-3): [Production Example A-3-1] Obtained in the same reaction vessel as [Production Example A-1-1] in [Production Example A-1-1]. 400 parts of the obtained rosin ester and 400 parts of gum rosin, heated to 200 ° C. under a nitrogen stream, gradually charged 40 parts of maleic anhydride, reacted at 200 ° C. for 5 hours, and strengthened rosin ester having an acid value of 110 (A- 3) was obtained.

[Production Example A-3-2] [Production Example A-1-]
50 parts of maleic anhydride was added to 800 parts of gum rosin in a molten state at 200 ° C. in the same reaction vessel as in [1], and the mixture was reacted at 200 ° C. for 5 hours under a nitrogen stream.
-1] The alkenyl-substituted succinic anhydride 20 obtained in [1]
And 50 parts of glycerin, heated to 250 ° C. and reacted at the same temperature for 24 hours to obtain a reinforced rosin ester (A-3) having an acid value of 95.

[Production Example A-3-3] [Production Example A-1-
[1] 15 parts of the alkenyl-substituted succinic anhydride obtained in [Production Example a-1] and 30 parts of glycerin were charged into 800 parts of gum rosin in a molten state at 200 ° C. in the same reaction vessel as in [1], and then maleic anhydride. Forty parts of acid was added and reacted at 250 ° C. for 24 hours under a nitrogen stream to obtain a reinforced rosin ester having an acid value of 120.

Production of Comparative Rosin Ester: [Comparative Production Example CA-1] [Preparation Example A-1-1] except that the alkenyl-substituted succinic anhydride was not used. To obtain a comparative rosin ester having an acid value of 9.

[Comparative Production Example CA-2] [Production Example A-3-
2], except that the alkenyl-substituted succinic anhydride was not used, to thereby obtain a comparatively strengthened rosin ester having an acid value of 90, except that [Production Example A-3-2] was used.

Production of rosin dispersion liquid (b-1) [Production Example b-1-1] A reaction vessel equipped with a stirrer, a thermometer, and a cooler was obtained in the above [Production Example A-2-1]. 100 parts of the obtained fortified rosin was heated and melted at about 150 ° C., and 16 parts of a polyoxyethylene (n = 10) nonylphenyl ether sulfosuccinate sodium salt aqueous solution (concentration: 25%) was added and mixed with vigorous stirring. A water-based emulsion was added, and 80 parts of hot water was further quickly added thereto to form a stable oil-in-water emulsion, and then cooled to room temperature to obtain a rosin dispersion liquid (b-1). The properties are shown in Table 1.

[Production Examples b-1-2, b-1-3, b-1
-4] A rosin dispersion in the same manner as in [Production Example b-1-1] except that the composition of the rosin-modified product and the emulsifier in [Production Example b-1-1] is changed as shown in Table 1. (B
-1) was obtained. The properties are shown in Table 1.

[0071]

[Table 1] Rosin dispersion liquid (b-1) In Table 1, 10FR: fumarated rosin obtained by adding 10 parts by weight of fumaric acid to 100 parts by weight of gum rosin. -PONSE-Na: polyoxyethylene (n = 10)
Nonylphenyl ether sulfosuccinate sodium salt (25% concentration). St-MAA-BMA-copolymer (salt): styrene (55% by weight)
/ Sodium salt of methacrylic acid (30% by weight) / butyl methacrylate (15% by weight) copolymer (concentration: 20%) AAM-AA-BMA-MASE copolymer: acrylamide (50
% By weight) / acrylic acid (20% by weight) / butyl methacrylate (15% by weight) / sulfoethyl methacrylate (15% by weight)
Wt%) copolymer (35% concentration).

Production of emulsifying dispersant (B): [Preparation Example B-1] In a reaction vessel similar to that of [Preparation Example b-1-1], obtained in the above [Preparation Example b-1-1]. Rosin dispersion 3
Parts (5.94 parts as is), 300 parts of soft water, 30 parts of methacrylic acid, 50 parts of styrene, 15 parts of isobutyl methacrylate, 5 parts of sodium methallyl sulfonate, 3 parts of n-dodecyl mercaptan, 3 parts of isopropyl alcohol After mixing and stirring and heating to an internal temperature of 50 ° C., 2 parts of ammonium persulfate and 2 parts of sodium bisulfite were added, and
The temperature was raised to 0 ° C., the reaction was cooled for 5 hours, and then cooled, and then 55 parts of 24% sodium hydroxide was added to obtain an emulsifying dispersant (B) of an anionic polymer. The properties are shown in Table 2.

[Production Examples B-2 to B-5] In [Production Example B-1], the rosin dispersion liquid (b-1) and the monomer mixture (b)
-2) was changed as shown in Table 2 and pH 10
Thus, an emulsifying dispersant (B) of an anionic polymer was obtained in the same manner as in [Production Example B-1] except that a predetermined amount of caustic soda was added. The properties are shown in Table 2.

Production of comparative emulsifying dispersant: [Comparative Production Examples CB-1 to CB-7] In [Production Example B-1], the composition of the emulsifier and monomer mixture (b-2) is as shown in Table 2. A comparative emulsifying dispersant was obtained in the same manner as in [Production Example B-1], except that the composition was changed to The properties are shown in Table 2.

[0075]

Table 2 Emulsifying and dispersing agent (B) In Table 2, St: styrene. MAA: Methacrylic acid. i-BMA: isobutyl methacrylate. SMAS: sodium methallyl sulfonate. BA: butyl acrylate. SAS: sodium allyl sulfonate. 2EHA: 2-ethylhexyl acrylate. NaSS: sodium styrene sulfonate. DBSNa: Sodium decylbenzenesulfonate. AMPS: 2-acrylamide {-2-methylphenyl EA: ethyl acrylate. Rovansulfonic acid. PODESNa: Polyoxyethylene (n = 13) decyl MAn: Maleic anhydride. Sodium salt of phenyl ether sulfate. AA: acrylic acid. α-MeSt: α-methylstyrene. R-K: potassium salt of rosin (15% solution). PEOE: polyoxyethylene (n = 9) oleyl ether. AAM: Acrylic amide. 10FR-K: 10% potassium salt of fumaric rosin (50% solution). GAMR: Camrosion. * 1: Used by dissolving 5 parts by weight of camrosin in the monomer mixture.

Production of sizing agent for papermaking: [Example 1] A mixed resin of 30 parts of rosin ester of [Production Example A-1-1] and 70 parts of reinforced rosin of [Production Example A-2-1] was used. Production example with heating and melting to 150 ° C and vigorous stirring
13 parts (concentration) of the emulsifying and dispersing agent [B-1] were added and mixed to form a water-in-oil emulsion, and 75 parts of hot water were further quickly added thereto to form a stable oil-in-water emulsion.
After cooling to room temperature, a sizing agent for papermaking was obtained. The properties are shown in Table 3.

[Examples 2 to 8] Mixing ratio of rosin ester (A-1), reinforced rosin (A-2), reinforced rosin ester (A-3) and emulsifying dispersant (B) in [Example 1] The sizing agents for paper making of [Examples 2 to 8] were obtained in the same manner as in [Example 1] except that the type and the type were changed as shown in Table 3. The properties are shown in Table 3.

Production of comparative papermaking sizing agents: [Comparative Examples 1 to 10] In [Example 1], the types and blending ratios of the rosin-based substance (A) and the emulsifying dispersant (B) are as shown in Table 3. Was emulsified and dispersed in the same manner as in [Example 1] to obtain paper sizing agents of [Comparative Examples 1 to 10]. The properties are shown in Table 3. (Comparative Example 4, Comparative Example 7
Could not be emulsified and dispersed. )

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[Table 3] Papermaking sizing agent * Comparative Example 4 and Comparative Example 7 could not be emulsified and dispersed.

Performance evaluation of papermaking sizing agent: Performance evaluation was performed on the papermaking sizing agents described in [Examples 1 to 8] and [Comparative Examples 1 to 10].

The measurement of the size effect, foaming property, temporal stability and average particle size of each papermaking sizing agent of [Examples 1 to 8] and [Comparative Examples 1 to 10] are as described above.

The measurement was performed according to the present invention. Table 4 shows the results.

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[Table 4] Performance evaluation of papermaking sizing agent * Comparative Example 4 and Comparative Example 7 could not be emulsified and dispersed and could not be evaluated.

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According to the present invention, as shown in the Examples,
In the papermaking area of 5.5 to 9, it has excellent sizing effect, low foaming property and stability over time as compared with the conventional sizing agent for papermaking.

Claims (5)

[Claims] 1. A papermaking sizing agent comprising a rosin-based substance (A), an emulsifying dispersant (B) and water, wherein the rosin-based substance (A) is an alkenyl-substituted succinic acid (a), a rosin ( rosin ester (A-1) and fortified rosin (A-2) obtained by heat-reacting b) and polyhydric alcohols (c)
A mixed resin with the above, or the component (a), the component (b),
(C) It consists of a rosin ester (A-3) obtained by heating and reacting the component and an α, β-unsaturated carboxylic acid (d), and the emulsifying dispersant (B) is a rosin dispersion (b-
In the presence of 1), a monomer mixture (b-2) of a hydrophobic vinyl monomer (a) and an anionic vinyl monomer (b)
A sizing agent for papermaking, which is an anionic polymer obtained by polymerizing 2. An emulsifying dispersant (B) comprising a rosin dispersion (b-
1) In the presence of 0.1 to 20 parts by weight, a monomer mixture (b-2) of 40 to 80% by weight of a hydrophobic vinyl monomer (A) 20 to 60% by weight of an anionic vinyl monomer (B) 80 to 99. The papermaking sizing agent according to claim 1, which is an anionic polymer obtained by emulsion-polymerizing 9 parts by weight. 3. The papermaking sizing agent according to claim 1, wherein the rosin dispersion (b-1) is an aqueous dispersion comprising a rosin modified product, an emulsifier and water. 4. The rosin dispersion (b-1) has an average particle diameter of:
The papermaking sizing agent according to any one of claims 1 to 3, which is 1 µm or less. 5. The papermaking sizing agent according to claim 1, wherein
A paper sizing method characterized by being used in a papermaking area of H5.5 to H9.