JP6059098B2 - Surface protective agent for printed matter and surface protective method for printed matter - Google Patents

Description

  The present invention relates to a surface protective agent for printed matter and a method for protecting the surface of the printed matter. In particular, the surface protective agent for printed matter, which can efficiently protect even the surface of a thick printed matter made of a non-silicone material and printed on matte paper, etc., and such surface protection for printed matter The present invention relates to a method for protecting a surface of a printed material using an agent.

Conventionally, the surface of a printed matter obtained using a rotary printing press is scratched on the surface due to friction with a mechanical device for performing these steps in a folding step or a cutting step as a post-process. In order to prevent this, a surface protective agent for printed matter called a so-called anti-scratch agent is applied.
Here, a silicone oil emulsion comprising a silicone oil and a surfactant has been proposed as such a surface protective agent for printed matter. (For example, refer to Patent Document 1).
More specifically, an aqueous emulsion is obtained by adding water to a cationic surfactant to form a liquid crystal, mixing and stirring the liquid crystal and organopolysiloxane, and mixing the mixture with water. A surface treatment agent for printing paper having an average particle diameter of 10 μm or less is disclosed.

In addition, a concentrated antistatic agent composition for offset rotary printing containing a predetermined polyethylene oxide as an essential component has been proposed in order to improve the charging property, sliding property, cosmetic property, and wettability of the printed material. (For example, refer to Patent Document 2).
More specifically, a concentrated antistatic agent for web offset printing, which is a water-soluble polymer having a molecular weight of 200 to 8000, comprising polyethylene oxide having a predetermined structural formula as an essential component, and further comprising a surfactant and water. A composition is disclosed.

Further, a web coater liquid for an offset printing press has been proposed, which is composed of an aqueous dispersion containing a polyolefin wax capable of achieving both friction resistance and moderate slipperiness. (For example, see Patent Document 3)
More specifically, it is a web coater liquid comprising an aqueous dispersion containing 0.1 to 3.0% by weight of polyethylene wax, wherein the total nonvolatile content in the aqueous dispersion is 0.2 to 10.0% by weight. %, And a web coater liquid for an offset printing machine in which the ratio of the polyethylene wax to the total nonvolatile content is 5 to 100% by weight.

In addition, a coating agent for offset printing containing a non-silicone surfactant has been proposed for the purpose of improving anti-cosmetics, static electricity removal and slip promotion in offset printing, and preventing poisoning of the platinum catalyst ( For example, see Patent Document 4).
More specifically, it is a coating agent for offset printing containing an emulsion type resin, a granular wax, and a non-silicone surfactant, and the glass transition point of the emulsion type resin is in the range of 0 to 80 ° C. And a coating agent for offset printing in which the average particle size of the granular wax is a value in the range of 2 to 10 μm and the solid content concentration is a value in the range of 0.6 to 4% by weight.
As the non-silicone surfactant, acetylene glycol surfactants, fluorine surfactants, and acrylic polymer surfactants are disclosed as preferable.

Therefore, the present inventor has already proposed a surface protective agent for printed matter comprising an aqueous dispersion containing the following components (A) to (C) in order to further improve the deactivation problem of the platinum catalyst. (For example, refer to Patent Document 5).
(A) Water: 100 parts by weight (B) At least one water-insoluble aliphatic compound selected from the group consisting of fatty acid glycol ester, aliphatic alcohol, aliphatic alcohol ester, aliphatic ether, and fatty acid monoalkylolamide : 0.01 to 10 parts by weight (C) Surfactant: 0.01 to 20 parts by weight

Japanese Patent Laid-Open No. 11-12985 JP 2009-72979 A JP-A-10-287060 JP 2007-296637 A JP 2011-156669 A

However, since the surface protective agent for printed matter disclosed in Patent Document 1 uses a silicone compound such as a silicone polymer, the silicone compound is scattered in the air, which is a platinum catalyst used as a combustion catalyst. The problem that it was easy to deactivate was seen.
That is, there is a problem that the platinum catalyst used as a combustion catalyst of the treatment device for burning the exhaust gas at the time of drying of the printing device at low temperature and deodorizing is poisoned by the scattered silicone compound and easily deactivated. It was. Therefore, due to the replacement of the expensive platinum catalyst, there has been a problem that a predetermined printing operation has to be interrupted frequently, which is economically disadvantageous.

Further, the concentrated antistatic agent composition for rotary offset printing disclosed in Patent Document 2 can exhibit a predetermined anti-scoring performance at a printing speed of relatively low, for example, 400 rpm, but the printing speed. Is relatively fast, for example, when the rotational speed is 800 rpm, there has been a problem that the predetermined anti-scoring performance cannot be exhibited.
More specifically, when the printing speed in the printing apparatus is relatively fast, a guide roll for flowing the printed material in a predetermined direction, a homer for folding the printed material in two in the flow direction, and for changing the flow direction of the printed material. In an accompanying device such as an impeller for feeding a turn bar or a cut and folded printed material to a conveyor, there has been a problem that a scratch on the surface of the printed material is likely to occur.

Further, when the web coater liquid for offset printing machine disclosed in Patent Document 3 is used, polyolefin wax accumulates at the air outlet of the homer or turn bar in the printing apparatus, and mixes with the ink, thereby increasing the size of black rice grains. There was a problem of becoming a hard material. That is, there has been a problem that such a hard substance is more likely to adhere to the surface of the printed material or to cause a scratch on the printed material.
In addition, solid matter (fine powder) due to the polyolefin wax component is deposited around the coating roll, and there is a problem that the printing environment is deteriorated.

Furthermore, although the coating agent for offset printing disclosed in Patent Document 4 contains granular wax having a predetermined particle diameter, as in Patent Document 2, when the printing speed is relatively high, the predetermined anti-scoring performance is achieved. The problem of not being able to demonstrate was seen.
Further, in the case of the coating agent for offset printing disclosed in Patent Document 4, since it contains a considerable amount of emulsion type resin and granular wax, as in Patent Document 3, a black rice grain-sized hard material is used in the accompanying device. There was a problem that substances were easily generated.

On the other hand, according to the surface protective agent for printed matter comprising a water-insoluble aliphatic compound such as flakes disclosed in Patent Document 5, the platinum catalyst is deactivated because it is a surface protective agent for non-silicone printed matter. Thus, even when printing is performed at a high speed or for a long period of time, smooth progress of the printed matter is ensured, and predetermined anti-scoring performance and the like can be effectively exhibited.
However, the problem of deactivation of the platinum catalyst can be effectively solved, and for a normal paper or the like, a good anti-scoring performance can be obtained even when printing at high speed, but the substrate of the printed material is mat paper. In such a case, when overprinting was performed, the anti-scoring property was sometimes insufficient.
In this respect, the matte paper surface is rougher than other papers, the ink is applied about 1.4 times thicker than usual, and in the case of overprinting, a plurality of printed layers are formed. It is thought to be caused.
That is, the coating thickness is increased as a whole, and the solvent component contained in the ink cannot be completely evaporated in the drying step, and the surface of the printing layer tends to be in a semi-lived state.
Therefore, when physical contact is made with the surface of the print layer, it is estimated that shear stress is applied to the ink, causing scratches or transfer of the ink, and printing defects are likely to occur.

Therefore, the present inventors made extensive efforts in view of the circumstances as described above, and by applying a surface protective agent for printed matter comprising a predetermined paraffinic oil to the surface of the printed matter, the surface of the printed layer becomes The inventors have found that the predetermined anti-scoring performance can be exhibited even in a semi-life state, and have completed the present invention.
That is, an object of the present invention is a surface protective agent for printed matter made of a non-silicone material or the like that is less likely to deactivate the platinum catalyst, and is a surface of a thick printed matter or the like printed on matte paper. Another object of the present invention is to provide a surface protective agent for printed matter that can be efficiently protected, and a method for protecting the surface of printed matter using such a surface protective agent for printed matter.

According to the present invention, a surface protective agent for printed matter, which is an aqueous dispersion containing the following components (A) to (C), is provided, and the above-described problems can be solved.
(A) 100 parts by weight of water (B) Paraffinic oil: 0.5 to 120 parts by weight (C) Surfactant: 0.1 to 30 parts by weight That is, a predetermined ratio of paraffinic and surface active to water By forming a surface protective agent for printed matter from an aqueous dispersion containing an agent, even if it is the surface of a thick printed matter or the like printed on matte paper, the predetermined anti-scoring performance is effectively exhibited. And good handleability can also be obtained.
In addition, since the predetermined paraffinic oil can be contained in a wide range, even if the blending amount varies somewhat, good anti-scoring performance and the like can be stably exhibited.
Furthermore, since the main component of the surface protective agent for printed matter is composed of a non-silicone material, there is no problem of deactivation of a platinum catalyst used as a combustion catalyst for exhaust gas in a processing apparatus.
In addition, with such a surface protective agent for printed matter, good anti-scoring performance and the like can be stably exhibited even on the surface of the printed matter at the time of reprinting.

Further, in constituting the printed material surface protective agent of the present invention, it is a paraffinic value of more than 60%% C _P of the oil as the component (B) preferably.
By limiting this way the% C _P of paraffinic oils, without dissolving the ink, effectively aggregated, as a result, similar to the silicone material, can exhibit a predetermined rubbing anti- .

Moreover, when comprising the surface protection agent for printed matter of this invention, it is preferable to make the aniline point of the paraffinic oil as (B) component into the value of 100 degreeC or more.
By limiting the aniline point of the paraffinic oil in this way, it is possible to control the solubility and the like of the printing ink quantitatively and accurately, and thus stably exhibit good anti-scoring properties. .

Moreover, when comprising the surface protective agent for printed matter of this invention, it is preferable to make the kinematic viscosity in 40 degreeC of the paraffinic oil as (B) component into the value within the range of 10-150,000 mm < ² > / s.
By limiting the kinematic viscosity of the paraffinic oil in this way, it is possible to control the solubility and the like of the printing ink quantitatively and accurately, and thus stably exhibit good anti-scoring properties. .

In constituting the surface protective agent for printed matter of the present invention, the paraffinic oil as the component (B) was chemically synthesized using at least one selected from the group consisting of ethylene, α-olefin, and isobutylene as a raw material. It is preferably a hydrogenated product of hydrocarbon oil or petroleum paraffin oil.
In this way, if the paraffinic oil is a predetermined synthetic hydrocarbon oil, it does not contain naphthene or aromatics, so the solubility of printing ink by the surface protective agent for printed matter can be controlled quantitatively and accurately. can do.
In addition, if the paraffinic oil is a hydrogenated product of petroleum-based paraffin oil, a part of the aromatic components contained in the oil derived from petroleum is decomposed into naphthene or paraffin to increase the viscosity index or C _A can be reduced, and as a result, even if the blending amount is relatively small, good anti-cosmetic properties can be stably exhibited.

In constituting the surface protective agent for printed matter of the present invention, the surfactant as the component (C) preferably contains a cationic surfactant.
By comprising in this way, the antistatic effect can be provided to the surface protective agent for printed matter.

Further, in constituting the surface protective agent for printed matter of the present invention, the component (E) further contains a viscosity modifier, and the content of the component (E) is 100 parts by weight of water as the component (A). On the other hand, the value is preferably within the range of 0.001 to 30 parts by weight.
By configuring in this way, even if the surface protective agent for printed matter tends to become excessively high viscosity or low viscosity due to changes in the ambient temperature, changes in the type or blending amount of the surfactant, The viscosity at the time of using the surface protective agent for printed matter can be adjusted to a value within an appropriate range, and uniform coating properties can be ensured.

In another embodiment of the present invention, (A) 100 parts by weight of water, (B) 0.5 to 120 parts by weight of paraffinic oil, and (C) 0.1 to 30 parts by weight of surfactant. A method for protecting a surface of a printed material using a surface protective agent for a printed material as an aqueous dispersion contained in a range of parts, comprising the following steps (i) to (iii): is there.
(I) A printing process in which printing is performed on a printing medium using a printing ink to obtain a printed material. (Ii) A coating process in which a surface protective agent for the printed material is applied to the surface of the printed material. (Iii) A surface protective agent for the printed material. Step of forming the surface protection member by drying the surface protection method in this way, even if it is the surface of a thick printed matter or the like printed on the matte paper, the predetermined anti-scoring performance, etc. Can be effectively exhibited.
Moreover, since the surface protective agent for printed matter, which is a non-silicone material, is used, there is no problem of deactivation of the platinum catalyst used as a combustion catalyst for exhaust gas in the processing apparatus.
In addition, good anti-scoring performance and the like can be stably exhibited even on the surface of printed matter or the like when reprinting.
Furthermore, since the predetermined paraffinic oil can be contained in a wide range, even if the blending amount varies somewhat, good anti-scoring performance and the like can be stably exhibited.

FIG. 1 (a) is a diagram for explaining the relationship between the blending amount of paraffinic oil and anti-scoring performance (printing speed), and FIG. 1 (b) is the blending amount of paraffinic oil. FIG. 1C is a diagram provided to explain the relationship between the surface protection agent for printed matter and the viscosity of the printed matter, and FIG. 1C shows the relationship between the amount of surfactant and anti-scoring performance (printing speed). It is a figure provided in order to explain. FIGS. 2A to 2C are diagrams provided for explaining the procedure of the surface protection method for a printed material using the surface protective agent for a printed material of the present invention. FIG. 3 is a diagram for explaining an outline of an offset printing apparatus using the surface protective agent for printed matter of the present invention.

[First embodiment]
The first embodiment is a surface protective agent for printed matter, which is an aqueous dispersion containing the following components (A) to (C).
(A) 100 parts by weight of water (B) 0.5 to 120 parts by weight of paraffinic oil (C) 0.1 to 30 parts by weight of surfactant Hereinafter, the surface protective agent for printed matter according to the first embodiment will be appropriately described. This will be specifically described with reference to FIG.

1. (A) Component (1) Aqueous material The surface protective agent for printed matter according to the first embodiment is a water dispersion containing a considerable amount of water, so that a predetermined surface protective member can be applied without damaging the printed matter to be applied. Can be formed.
In addition, if the surface protective agent for printed matter is an aqueous dispersion containing a considerable amount of water, it can be handled easily at the time of production, storage, water dilution or application.

(2) Blending amount When the surface protective agent for printed matter is constituted as a stock solution, the blending amount of water as component (A) is 40 to 40% of the total amount (100% by weight) of the surface protecting agent for printed matter. The value is preferably in the range of 95% by weight, more preferably in the range of 50 to 90% by weight, and still more preferably in the range of 55 to 85% by weight.
In addition, at the time of use, when a predetermined amount of water is additionally diluted to obtain a surface protective agent for printed matter, the amount of water as component (A) is usually based on the total amount of the surface protective agent for printed matter, A value within the range of 70 to 99.5% by weight is preferable.
The reason for this is that when the amount of water is less than 70% by weight, when applied to a printed material, the surface becomes sticky, the printed materials stick to each other, or handling as an aqueous material becomes difficult. This is because there are cases.
On the other hand, when the amount of water exceeds 99.5% by weight, it is difficult to stably form a predetermined protective film, and it is difficult to exhibit predetermined anti-scoring performance and the like. Because there is.
Therefore, it is more preferable that the blending amount of water as the component (A) is set to a value within the range of 80 to 99% by weight, and the range of 90 to 98% by weight with respect to the total amount of the surface protective agent for printed matter. More preferably, the value is within the range.

2. (B) Component (1) Type Paraffinic oil is blended as the component (B).
The reason for this is that paraffinic oil can be agglomerated without dissolving the ink, so even if it is the surface of a thick printed matter that is printed on mat paper etc., the printed matter at the time of reprinting This is because good anti-scoring performance and the like can be stably exhibited even on surfaces such as the above.
Further, since it is a non-silicone material, there is no problem of deactivation of a platinum catalyst used as a combustion catalyst for exhaust gas in a processing apparatus.
Furthermore, since paraffinic oils can be contained in a wide range, even if the blending amount varies somewhat, good anti-scoring performance and the like can be stably exhibited. Because.

(1) -1. Synthetic hydrocarbon oil The paraffinic oil as the component (B) is preferably a hydrocarbon oil chemically synthesized from at least one selected from the group consisting of ethylene, α-olefin, and isobutylene.
More specifically, as paraffinic oil, α-olefin (1-decene, C10H20) is used as a raw material, poly-α-olefin (PAO) produced by a polymerization reaction and hydrogenation treatment, mainly n-butylene. -Synthetic paraffinic hydrocarbon oils synthesized by chemical synthesis such as polybutene (polyisobutylene), which is a copolymer with butene, and oligomers of ethylene and α-olefin, may be used alone. They may be used in combination of two or more.
The reason for this is that if the paraffinic oil is a specified synthetic hydrocarbon oil, it does not contain naphthene or aromatic components, so the solubility of printing ink by the surface protective agent for printed matter can be controlled quantitatively and accurately. This is because it can be done.

(1) -2. Hydrogenated product The paraffinic oil as the component (B) is preferably a hydrogenated product of a petroleum paraffin oil obtained by refining and hydrogenating a petroleum fraction.
The reason for this is that if the paraffinic oil is a hydrogenated product of petroleum paraffin oil, some of the aromatic components contained in the oil are decomposed into naphthene and paraffin, so that the oil can have a high viscosity index. It is.
Further, by hydrogenation, so as no double bonds, such as aromatic hydrocarbons, or a portion of the alkyl varied isoforms, i.e.,% of C _A low content value is low, the viscosity index It is because it can be made high oil.
More specifically,% in paraffin oil C _A 6% or less, more preferably 3% or less, more preferably, preferably 0.1% or less.
Whether or not the paraffinic oil is a hydrogenated product can be determined by measuring the double bond content in a benzene ring or the like using a Fourier transform infrared spectrophotometer (FT-IR). it can.

(2) Blending amount Also, the blending amount of the paraffinic oil as the component (B) is set to a value within the range of 0.5 to 120 parts by weight with respect to 100 parts by weight of the water as the component (A). It is characterized by.
The reason for this is that when the blending amount of such paraffinic oil is less than 0.5 parts by weight, it is difficult to effectively exhibit anti-skin properties or the like, and the properties as a lubricant are significantly reduced. This is because, due to strong friction, the paper may be excessively charged and the paper alignment of the printed matter may be lowered.
On the other hand, when the blending amount of the paraffinic oil exceeds 120 parts by weight, the viscosity of the obtained surface protective agent for printed matter is remarkably increased, thixotropic property is remarkably exhibited, and handleability and dispersibility are excessively lowered. This is because there is a case of doing.
Therefore, the blending amount of the paraffinic oil as the component (B) is more preferably set to a value within the range of 1 to 100 parts by weight with respect to 100 parts by weight of the water as the component (A). More preferably, the value is within the range of parts by weight.

Here, referring to FIG. 1 (a), when diluted with a predetermined amount of water to obtain a surface protective agent for printed matter, the blending amount of paraffinic oil and the anti-scoring performance by the surface protective agent for printed matter The relationship between will be explained.
More specifically, the horizontal axis of FIG. 1A shows the blending amount (parts by weight) of paraffinic oil with respect to 100 parts by weight of water, and the vertical axis prints 50,000 sheets of printed matter. In this case, the number of rotations (rpm) of the printing press that does not generate a predetermined blur is shown.
Line A is a characteristic curve when mat paper is used as printing paper, and line B shows a characteristic curve when fine coated paper is used as printing paper.
That is, when mat paper is used as printing paper, as indicated by line A, if the blending amount of paraffinic oil is 1.0 part by weight, the rotational speed of the printing machine is about 600 rpm and 5 It is confirmed that when a printed product of 10,000 lots is printed, a predetermined blur does not occur, but when the rotational speed exceeds 600 rpm, a predetermined blur occurs when a printed material of 50,000 lots is printed. It was done.
Similarly, when mat paper is used as printing paper, as indicated by line A, if the blending amount of paraffinic oil is 1.5 parts by weight, the rotational speed of the printing machine is about 700 rpm, When a printed material of 50,000 sheets is printed, a predetermined blur does not occur. However, when the rotational speed exceeds 700 rpm, a predetermined blur may occur when a printed material of 50,000 sheets is printed. confirmed.
Furthermore, similarly, when mat paper is used as printing paper, as indicated by line A, if the blending amount of paraffinic oil is 3.1 parts by weight, the rotational speed of the printing press is about 800 rpm, When a printed material of 50,000 sheets is printed, a predetermined blur does not occur. However, when the rotational speed exceeds 800 rpm, a predetermined blur may occur when a printed material of 50,000 sheets is printed. confirmed.
On the other hand, when fine coated paper is used as printing paper, as indicated by line B, if the blending amount of paraffinic oil is 0.5, 0.6, 0.9, and 1.5 parts by weight, It was confirmed that when the rotational speeds of the printing presses were about 500, 600, 700, and 800 rpm, no predetermined blur occurred even when 50,000 lots of printed matter were printed.
Therefore, when matte paper and finely coated paper are used as printing papers, in order to prevent a predetermined blur from occurring when printing 50,000 lots of printed matter at a rotation speed of about 600 rpm, It is understood that it is effective that the blending amount of the paraffinic oil with respect to 100 parts by weight is 0.5 parts by weight or more.

Next, with reference to FIG. 1B, the relationship between the blending amount of the paraffinic oil and the viscosity of the surface protective agent for printed matter when the surface protective agent for printed matter is configured as a stock solution will be described.
The horizontal axis of FIG. 1 (b) shows the blending amount (parts by weight) of paraffinic oil with respect to 100 parts by weight of water in the range of 20 to 160 parts by weight, and the vertical axis shows the surface protective agent for printed matter. The viscosity (mPa · sec (measurement temperature: 20 ° C., measurement rotation speed: 12 rpm)) is shown.
In addition, about the compounding quantity of surfactant, it was set as the quantity which can form a uniform emulsion with paraffin oil and water, and set it as the value within the range of about 3.3-32.6 weight part.
That is, as shown in the characteristic curve in FIG. 1B, when the blending amount of paraffinic oil is about 46 parts by weight, the measured viscosity is about 18 mPa · sec, and the blending amount of paraffinic oil is Is about 78 parts by weight, the measured viscosity is about 23 mPa · sec. If the blended amount of the paraffinic oil is about 95 parts by weight, the measured viscosity is about 73 mPa · sec. If the blending amount of the paraffinic oil is about 120 parts by weight, the measured viscosity is about 410 mPa · sec. If the blending amount of the paraffinic oil is about 140 parts by weight, the measured viscosity is about When it was 1280 mPa · sec and the blending amount of the paraffinic oil was about 160 parts by weight, the measured viscosity was about 2840 mPa · sec.
Therefore, it is understood that it is effective to make the blending amount of the paraffinic oil with respect to 100 parts by weight of water 120 parts by weight or less in order to make the viscosity a value of about 500 mPa · sec or less so that the handling is easy. Is done.

(3)% C _P
Also, the% C _P of paraffinic oil as the component (B), it is preferable that 60% or more.
This is because, by limiting this way the% C _P of paraffin oil, quantitatively and accurately the solubility or the like of the printing ink, is because it is possible to control.
Therefore, the% CP of the paraffinic oil as the component (B) is more preferably set to a value within the range of 65 to 100%, and further preferably set to a value within the range of 70 to 100%.
In particular, synthetic paraffinic hydrocarbon oil is more preferable because% _CP is 100%.
Incidentally,% C _P of the paraffinic oil, according to the n-d-M method, refractive index, density, molecular weight, a sulfur content is measured and then performing n-d-M ring analysis, be calculated it can.

(4) Aniline point The aniline point of the paraffinic oil as the component (B) is preferably set to a value of 100 ° C or higher.
This is because when the aniline point of the paraffinic oil is less than 100 ° C., the printing ink is easily dissolved and the printed matter is stained with the dissolved ink.
That is, by limiting the aniline point of the paraffinic oil to a predetermined temperature or higher, the solubility of the printing ink by the surface protective agent for printed matter can be controlled quantitatively and accurately.
Accordingly, the aniline point in the paraffinic oil is more preferably set to a value of 110 ° C. or higher, and further preferably set to a value of 120 ° C. or higher.
In addition, the aniline point in paraffinic oil can be measured according to JIS K2256.

(5) Kinematic viscosity Moreover, it is preferable to make the kinematic viscosity in 40 degreeC of the paraffinic oil as (B) component into the value within the range of 10-150000mm < ² > / s.
This is because, by limiting the kinematic viscosity of the paraffinic oil, the solubility and the like of the printing ink by the surface protective agent for printed matter can be controlled quantitatively and accurately.
More specifically, when the kinematic viscosity at 40 ° C. is less than 10 mm ² / s, the oil applied to the paper surface on which the ink on the surface of the printed material is not applied penetrates in the thickness direction of the paper, and the machine is slightly This is because the ink adhering to the ink tends to adhere to the portion, which may cause a background stain.
On the other hand, when the kinematic viscosity at 40 ° C. exceeds 150,000 mm ² / s, the speed at which the paraffinic oil fine particles adhering to the surface of the printed material wet and spread is slow, and it takes time to cover the entire surface of the printed material. This is because there are cases where the
Therefore, more preferably a value within the range of kinematic viscosity at 40 ° C. of 50~10000mm ² / s, to a value within the range of 100~8000mm ² / s is more preferable.

3. (C) Component (1) Type The type of surfactant as component (C) is not particularly limited, and is a cationic surfactant, anionic surfactant, nonionic surfactant, or amphoteric surfactant. Any surfactant in the agent can be used.
More specifically, as nonionic surfactants, lauryl alcohol alkylene oxide adduct, myristyl alcohol alkylene oxide adduct, cetyl alcohol alkylene oxide adduct, stearyl alcohol alkylene oxide adduct, oleyl alcohol alkylene oxide adduct, Aliline alcohol alkylene oxide adducts such as unilin alcohol alkylene oxide adducts (alkylene oxide adducts of alcohols having 10 to 50 carbon atoms); octylphenol alkylene oxide adducts, nonylphenol alkylene oxide adducts, dodecylphenol alkylene oxide adducts, etc. Alkylphenol alkylene oxide adduct (alkylene oxyalkylene having 6 to 16 carbon atoms) Fatty acid alkylene oxide adducts such as lauric acid alkylene oxide adducts and stearic acid alkylene oxide adducts (fatty acid alkylene oxide adducts having 10 to 50 carbon atoms); polyalkylene glycol oleic acid monoester, polyalkylene glycol Polyhydric alcohol fatty acid ester alkylene oxide adducts such as oleic acid diester and polyalkylene glycol lauric acid diester (polyhydric alcohol is ethylene glycol, glycerin, etc., and fatty acid has 10 to 20 carbon atoms); laurylamine alkylene Higher alkylamine alkylene oxide adducts such as oxide adducts and stearylamine alkylene oxide adducts (alkylamine alkylene oxides having 10 to 20 carbon atoms) Adducts); fatty acid amide alkylene oxide adducts such as lauric acid amide alkylene oxide adducts and stearic acid amide alkylene oxide adducts (fatty acid amide alkylene oxide adducts having 10 to 20 carbon atoms); coconut oil reduced alcohol alkylene oxide adducts Fatty acid alkylene oxide adducts such as beef tallow reduced alcohol alkylene oxide adducts, Macco alcohol alkylene oxide adducts; polypropylene glycol ethylene oxide adducts; glycerol fatty acid esters such as lauric acid monoglyceride; pentaerythritol palmitic acid monoester Fatty acid ester of pentaerythritol; sorbitan lauric acid monoester, sorbitan oleic acid monoester, sorbitan oleic acid trie Fatty acid esters of sorbitol and sorbitan such as steal; fatty acid esters of sucrose such as lauric acid monoester of sugar and stearic acid monoester of sugar; alkyl esters of polyhydric alcohols; fatty acid amides of alkanolamines; A combination of two or more types can be mentioned.
Examples of the alkylene oxide used in the case of an alkylene oxide adduct include ethylene oxide, propylene oxide, and butylene oxide, and preferred are ethylene oxide and propylene oxide. What added 2 mol or more of alkylene oxides may be a block addition or a random addition.
Of these, aliphatic alcohol alkylene oxide adducts, fatty acid alkylene oxide adducts, polyhydric alcohol fatty acid esters, polyhydric alcohol fatty acid ester alkylene oxide adducts, and fatty acid esters of sorbitol and sorbitan are more preferable.

Further, as anionic surfactants, (poly) oxyethylene (degree of polymerization = 1 to 100) ether carboxylate having a hydrocarbon group having 8 to 24 carbon atoms such as sodium lauryl ether acetate; (poly) oxyethylene ( Degree of polymerization = 1 to 100) ether sulfate ester salt having a hydrocarbon group having 8 to 24 carbon atoms such as sodium lauryl sulfate; di- or monosodium salt of sulfosuccinic acid mono- or dialkyl ester, sulfosuccinic acid (poly) oxyethylene (polymerization) Degree = 1-100) Sulfosuccinic acid ester salt having a hydrocarbon group having 8-24 carbon atoms such as di- or mono-sodium salt of mono- or dialkyl ester; (poly) oxyethylene (degree of polymerization = 1-100) coconut oil fatty acid Sodium monoethanolamide sulfate; dodecylbenzenesulfone Sulfonates having a hydrocarbon group having 8 to 24 carbon atoms such as sodium; carbonization having 8 to 24 carbon atoms such as sodium lauryl phosphate, (poly) oxyethylene (degree of polymerization = 1 to 100) sodium lauryl ether phosphate Phosphate ester salts having hydrogen groups; fatty acid salts such as sodium laurate and triethanolamine laurate; coconut oil fatty acid sodium methyltaurine, coconut oil fatty acid sarcosine sodium, coconut oil fatty acid sarcosine triethanolamine, N-coconut oil fatty acid Examples include acylated amino acid salts such as acyl-L-glutamic acid triethanolamine, N-coconut oil fatty acid acyl-L-glutamic acid sodium, lauroylmethyl-β-alanine sodium, and the like alone or in combination of two or more.
Among these, preferred are sulfonates having a hydrocarbon group having 8 to 24 carbon atoms, which are difficult to form an ion complex with a cationic surfactant which is a main raw material of the antistatic agent used in the printing process.

  Further, as amphoteric surfactants, coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine, lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, laurylhydroxysulfobetaine, lauroyl Examples include betaine-type amphoteric surfactants such as amidoethylhydroxyethylcarboxymethylbetaine and sodium hydroxypropyl phosphate; amino acid-type amphoteric surfactants such as sodium β-laurylaminopropionate; It is done.

  Further, as cationic surfactants, alkyl (carbon number: 10 to 24) trimethylammonium salts such as cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, and behenyltrimethylammonium chloride; didecyldimethylammonium chloride, dilauryldimethylammonium chloride Dialkyl (carbon number 10 to 24) dimethylammonium salts such as dimyristyldimethylammonium chloride, dipalmityldimethylammonium chloride, dioleyldimethylammonium chloride, distearyldimethylammonium chloride, dibehenyldimethylammonium chloride; dipalmitoylethylhydroxyethyl Monium methosulfate, distearoyl ethyl hydroxy Dialkyl (8 to 24 carbon atoms) ethylhydroxyethylmonium salt such as tilmonium methosulfate, dicocoylethylhydroxyethylmonium methosulfate; 1-hydroxyethyl-1-methyl-2-stearylimidazolinium chloride, 1-hydroxyethyl -1-methyl-2-laurylimidazolinium chloride, 1-hydroxyethyl-1-methyl-2-tallow imidazolinium chloride, 1-hydroxyethyl-1-methyl-2-soybean imidazolinium chloride, 1- 1-hydroxyethyl-1-methyl-2-alkyl (carbon number 10-24) imidazolinium salt such as hydroxyethyl-1-methyl-2-coconut oil imidazolinium chloride; cetylpyridinium chloride, stearamide methylpyridinium Alkyl (carbon number 8-24) pyridinium salt such as rholide; Dialkyl or dialkenyl (carbon number 8-24) imidazolinium salt such as dioleyl imidazolinium methosulfate, distearyl imidazolinium methosulfate; A combination of two or more types can be mentioned.

In addition, as a part or all of the surfactant as the component (C), a cationic surfactant having antistatic properties (this is differentiated from other surfactant (first surfactant). Therefore, it is also preferable to add a second surfactant).
The reason for this is that not only the emulsifying effect of paraffinic oil but also the addition of a second surfactant having an antistatic effect can improve both characteristics of the surface protective agent for printed matter, and thus prevent rusting. This is because not only the properties but also the effects such as good paper alignment can be exhibited.
That is, examples of the cationic surfactant include the cationic surfactants described above, and one or a combination of two or more of the cationic surfactants are preferably used as the second surfactant. be able to.

(2) Compounding amount Moreover, the compounding amount of the surfactant as the component (C) should be a value within the range of 0.1 to 30 parts by weight with respect to 100 parts by weight of the water as the component (A). It is characterized by.
This is because when the amount of the surfactant is less than 0.1 parts by weight, the compounding effect is not exhibited, and the dispersibility and emulsification of the paraffinic oil may be significantly reduced. .
As a result, the anti-scoring property is not exhibited, and the paper alignment property of the printed matter may be deteriorated or excessively charged.
On the other hand, when the blending amount of such a surfactant exceeds 30 parts by weight, it becomes highly viscous and water dilution becomes difficult, or is excessively applied to the printed matter, and stickiness on the printed matter surface is excessively generated, This is because the paper alignment and paper folding accuracy may decrease.
Therefore, the blending amount of the surfactant as the component (C) is preferably set to a value within the range of 0.5 to 20 parts by weight with respect to 100 parts by weight of the water as the component (A). More preferably, the value is within the range of 10 parts by weight.
In addition, when blending not only the first surfactant but also the second surfactant described above as the surfactant as the component (C), the blending amount of the second surfactant is (C ) It is preferable to set the value within the range of 20 to 100% by weight and the value within the range of 30 to 80% by weight with respect to the total amount (100% by weight) of the surfactant as the component. It is more preferable that the value be in the range of 40 to 60% by weight.

Next, referring to FIG. 1 (c), in the case of diluting with a predetermined amount of water to obtain a surface protective agent for printed matter, the blending amount of the surfactant, and anti-scoring performance by the surface protective agent for printed matter, The relationship will be described.
More specifically, the horizontal axis of FIG. 1 (c) shows the blending amount (parts by weight) of the surfactant with respect to 100 parts by weight of water, and the vertical axis prints 50,000 lots of printed matter. In this case, the number of rotations (rpm) of the printing press that does not generate a predetermined blur is shown.
In addition, about the compounding quantity of paraffinic oil, it was set as the quantity which paraffinic oil can form a uniform emulsion with water, and was taken as the value within the range of about 0.5-3 weight part.
Line A is a characteristic curve when mat paper is used as printing paper, and line B shows a characteristic curve when fine coated paper is used as printing paper.
That is, when mat paper is used as printing paper, as indicated by line A, if the surfactant content is 0.15 parts by weight, the number of rotations of the printing machine is about 600 rpm and 50,000 sheets It is confirmed that when a printed matter of a lot is printed, a predetermined blur does not occur, but when a rotational speed exceeds 600 rpm, when a printed matter of 50,000 lots is printed, a predetermined blur is generated. .
Similarly, when mat paper is used as printing paper, as indicated by line A, if the blending amount of the surfactant is 0.25 parts by weight, the rotational speed of the printing machine is about 700 rpm, It is confirmed that, when a printed material of 50,000 sheets is printed, the predetermined blur does not occur, but when the rotational speed exceeds 700 rpm, a printed image of 50,000 sheets is printed, and a predetermined cosmetic is generated. It was done.
Furthermore, similarly, when mat paper is used as printing paper, as indicated by line A, if the blending amount of the surfactant is 0.52 parts by weight, the rotational speed of the printing machine is about 800 rpm, When a printed material of 50,000 sheets is printed, a predetermined blur does not occur. However, when the rotational speed exceeds 800 rpm, a predetermined blur may occur when a printed material of 50,000 sheets is printed. confirmed.
On the other hand, when fine coated paper is used as the printing paper, as indicated by line B, the surfactant content is 0.05, 0.1, 0.15, 0.25 parts by weight It has been confirmed that when the rotational speed of the printing press is about 500, 600, 700, and 800 rpm, a predetermined blur does not occur even when a printed material of 50,000 lots is printed.
Therefore, when matte paper and finely coated paper are used as printing papers, in order to prevent a predetermined blur from occurring when printing 50,000 lots of printed matter at a rotation speed of about 600 rpm, It is understood that it is effective that the blending amount of the surfactant with respect to 100 parts by weight is 0.1 parts by weight or more.
In addition, it has been found that in order to obtain a uniform and stable emulsion in the surface protective agent for printed matter, the blending amount of the surfactant should be changed similarly to the blending amount of the paraffinic oil. Thus, when the upper limit of the blending amount of paraffinic oil is 120 parts by weight, the upper limit of the blending amount of the surfactant should be about 30 parts by weight.

4). (D) Type of component (1) It is preferable to blend an antistatic agent as component (D).
The reason for this is that by adding an antistatic agent, the stability of the surface protective agent for printed matter is improved, and even when high-speed printing is performed on the printed matter, generation of static electricity is prevented, and the paper is easily removed. This is because alignment can be performed.
Here, as a preferable antistatic agent, use of a commercially available compounding agent called an antistatic agent for off-line, a softening agent for clothing, an antistatic agent used in a fiber manufacturing process, etc. provides slipperiness at the same time. preferable.

(2) Blending amount The blending amount of the antistatic agent as the component (D) may vary depending on the purpose and the like, but is usually 100 parts by weight of the water as the component (A). It is preferable to set it as the value within the range of 0.1-20 weight part.
The reason for this depends on the type of antistatic agent, but if the amount of the antistatic agent is less than 0.1 parts by weight, the additive effect may not be exhibited.
On the other hand, when the amount of the antistatic agent is excessively large, for example, when it exceeds 20 parts by weight, it becomes difficult to dilute with water due to high viscosity, or it is excessively applied to the printed matter to form a protective film. In some cases, the surface may become sticky, or problems such as blocking that may cause sticking between printed materials may occur.
Accordingly, the blending amount of the antistatic agent as the component (D) is more preferably set to a value within the range of 0.5 to 15 parts by weight with respect to 100 parts by weight of the water as the component (A). More preferably, the value is within the range of 10 parts by weight.
If the antistatic agent as component (D) is a commercially available antistatic agent used for ordinary off-line printing or a softening agent for clothing used at home for washing, it is pre-blended with a surface protective agent for printed matter. Or you may add at the time of use.

5. (E) Type of component (1) It is preferable that the component (E) further contains a viscosity modifier with respect to the surface protective agent for printed matter.
The reason for this is that by blending the viscosity modifier, handling and storage management of the surface protective agent for printed matter can be facilitated, and more stable and uniform can be applied to the printed matter.
In other words, the surface protective agent for printed matter tends to become excessively high or low in viscosity due to changes in ambient temperature, changes in the type or blending amount of the surfactant, etc., but by adding a viscosity modifier, This is because the viscosity when using the surface protective agent for printed matter can be adjusted to a value within an appropriate range.
The type of the viscosity modifier is not particularly limited. For example, as the viscosity modifier (thickener) for reducing the viscosity, as a polyhydric alcohol having 2 to 5 carbon atoms, for example, ethylene Dihydric alcohols such as glycol, propylene glycol, diene glycol and dipropylene glycol; trihydric alcohols such as glycerin; 1 having 2 to 6 carbon atoms such as ethanol, isopropanol, propanol, butanol and 3-methyl-3-methoxybutanol Examples of glycol ethers having 3 to 20 carbon atoms include diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ethylene glycol monobutyl ether and ethylene glycol mono Selected from monoalkyl ethers such as phenyl ether; dialkyl ethers such as ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol isopropyl methyl ether, dipropylene glycol dimethyl ether and dipropylene glycol n-propyl methyl ether; 1 type (s) or 2 or more types can be used. Preferred are ethylene glycol, diethylene glycol, propylene glycol, ethanol, isopropyl alcohol and 3-methyl-3-methoxybutanol. Moreover, the ratio in the case of using 2 or more types together is not specifically limited.

Similarly, as another viscosity modifier (thickening agent) for lowering the viscosity, an inorganic salt that can be dissolved in 10 g or more in 100 g of water at 25 ° C., such as a halide (sodium chloride, Alkali metal salts such as potassium chloride, sodium bromide, etc., sulfates (sodium sulfate, potassium sulfate etc.) and phosphates (sodium phosphate, potassium phosphate etc.); halides (calcium chloride, magnesium chloride etc.) and Alkaline earth metal salts such as sulfates (such as magnesium sulfate); and ammonium salts such as halides (such as ammonium chloride) and sulfates (such as ammonium sulfate).
Of these, sodium chloride, sodium sulfate, and calcium chloride are more preferable.

On the other hand, as a viscosity modifier (thickener) for increasing the viscosity, nonionic polymers such as polyalkylene glycol and polyglycerin, polydiallyldimethylammonium chloride, polydiallylmethylethylammonium ethyl sulfate, dimethylamine -Epichlorohydrin copolymer, acrylamide-diallyldimethylammonium chloride copolymer, cationic polymer aqueous solution such as cationized cellulose, cationized starch, polyamidine and the like.
Among these, cationic systems such as polydiallyldimethylammonium chloride, polydiallylmethylethylammonium ethyl sulfate, dimethylamine-epichlorohydrin copolymer, acrylamide-diallyldimethylammonium chloride copolymer, cationized cellulose, cationized starch, polyamidine, etc. A polymer aqueous solution or the like is more preferable.
This is because in addition to the uniform application property of the drug by thickening, it also has antistatic ability.

(2) Blending amount In addition, the blending amount of the viscosity modifier as the component (E) may be changed depending on the purpose and the like, but usually with respect to 100 parts by weight of the water as the component (A), A value within the range of 0.001 to 30 parts by weight is preferable.
The reason for this depends on the type of the viscosity modifier, but if the blending amount of the viscosity modifier is less than 0.001 part by weight, the effect of addition may not appear.
On the other hand, if the blending amount of the viscosity modifier becomes excessively large, for example, exceeds 30 parts by weight, the viscosity becomes so high that it becomes difficult to dilute with water, or the emulsification is destroyed and the long-term storage stability deteriorates. This is because when the protective film is formed by being excessively applied to the printed matter, problems such as the stickiness of the surface may occur.
Therefore, the blending amount of the viscosity modifier as the component (E) is more preferably set to a value within the range of 0.003 to 20 parts by weight with respect to 100 parts by weight of the water as the component (A). More preferably, the value is within the range of 0.005 to 10 parts by weight.

6). Other Additives In addition, it is also preferable to add other various additives as long as the effects of the present invention are not impaired.
Examples of such additives include emulsification aids, antifoaming agents, preservatives, antioxidants, coloring agents, conductivity imparting agents, surface tension adjusting agents, protective colloid agents, pH adjusting agents, lubricants, and slip suppression. One kind or a combination of two or more kinds of agents can be mentioned.

7). Use aspect of surface protective agent for printed matter The surface protective agent for printed matter according to the present invention may be used as a stock solution, added with a predetermined amount of water, etc., and diluted for use (first use aspect). It is also preferable that the usage mode (second usage mode) is such that water or the like is added in advance so as to obtain a suitable viscosity at the time of use and the dilution is adjusted and used as it is.
And since it is easy to adjust the viscosity etc. of the surface protective agent for printed matter regarding the viscosity of the surface protective agent for printed matter as the undiluted solution, it is preferable to set the value within the range of 20 to 4000 mPa · sec at a measurement temperature of 25 ° C. More preferably, the value is within the range of 30 to 3000 mPa · sec.
Furthermore, regarding the viscosity of the surface protective agent for printed matter at the time of use, it is preferably a value within a range of 0.1 to 1000 mPa · sec at a measurement temperature of 25 ° C., and a value within a range of 0.5 to 300 mPa · sec. It is more preferable that the value be within a range of 1 to 100 mPa · sec.

[Second Embodiment]
2nd Embodiment is the surface protection method of the printed matter using the surface protective agent for printed matter of 1st Embodiment, Comprising: The surface protection of the printed matter characterized by including following process (i)-(iii) Is the method.
(I) A printing process in which printing is performed on a printing medium using a printing ink to obtain a printed material. (Ii) A coating process in which a surface protective agent for printed material is applied to the surface of the printed material. (Iii) A surface protective agent for printed material. Step of Forming Surface Protection Member by Drying Hereinafter, a surface protection method using a surface protective agent for printed matter with respect to the surface of the printed matter will be specifically described with reference to FIGS. 2 and 3.

1. Surface protectant for printed matter Since it can be the contents described in the surface protectant for printed matter of the first embodiment, further explanation here is omitted.

2. Step (i) As shown in FIG. 2A, the step (i) performs predetermined printing with the printing ink 3 on a printing medium (matte paper or the like) 4 using a printing device, and prints 5 It is a printing process to obtain.
The mode of the printing apparatus that performs the step (i) is not particularly limited. For example, the rotary offset printing apparatus 100 illustrated in FIG. 3, the gravure printing apparatus, the screen printing apparatus, or the inkjet printing apparatus. It is preferable to use at least one of the above.

3. (Ii) Process (ii) The process is an application process for applying a surface protective agent 2 ′ for printed matter to the surface of the printed matter 5, as shown in FIG.
Here, the coating amount of the surface protective agent 2 ′ for printing can be changed according to the paper type or the like as the base material of the printed matter, but is usually set to a value within the range of 50 to 300 mg / m ^2. Is preferred.
The reason for this is that when the amount of the printing protective agent applied is less than 50 mg / m ² , static electricity is likely to be generated in the printed matter, and the anti-stress effect on the printed matter may not be exhibited.
On the other hand, when the coating amount of the protective agent for printing exceeds 300 mg / m ² , the stickiness of the surface becomes large, and papers tend to stick to each other or wrinkles are likely to occur.
Therefore, we are more preferable to set the application amount of the printing protective agent a value within the range of 70~250mg / m ^2, still more preferably a value within the range of 70~200mg / m ^2.

And in the rotary offset printing apparatus 100 as shown in FIG. 3, the surface protective agent for printed matter of the present invention has a feature that it easily exhibits a predetermined anti-scratch effect.
That is, the rotary offset printing apparatus 100 typically includes a paper feeder 10, an infeed machine 20, a printing unit 30, a dryer 40, a web cooler 50, a surface treatment apparatus 60, a folding machine. The cutting machine 80 and the stacker 90 are provided. The web cooler 50 includes a cooling roller 50a and a water spray device 50b.
Here, a web as a printing medium wound in a roll shape, for example, a paper roll, is disposed in the paper feeder 10 and is a constituent member for continuously feeding it. The infeed machine 20 is a structural member for accurately guiding a web as a print medium to a route at a predetermined position.
Further, the printing unit 30 includes an offset print head, and is a constituent member for applying a predetermined printing ink to a predetermined place of a web as a printing medium.
Moreover, the dryer 40 is a structural member for carrying out hot air drying of the printing ink printed on the web as a printing medium (printing paper), and setting it as printed matter.
The web cooler 50 is composed of a cooling roller 50a and a nozzle 50b for applying a humidifying agent to the web. The web cooler 50 is a component for cooling the printed matter and applying the required moisture. is there.
Further, the folding machine 80 is folded into a homer portion that folds a continuous printed product in two in parallel in the width direction, a cutting portion that cuts the printed material into a certain length, and a folding portion that folds the cut printed material in two. And an impeller that feeds the printed matter one by one on the conveyor belt.
Furthermore, the stacker 90 is a constituent member for bundling paper sheets that are cut by cutting a printed material into a predetermined size and arranged in layers for each specified number of sheets.

And the surface treatment apparatus 60 is a structural member which is located between the web cooler 50 and the folding machine 80, for example, and applies the surface protective agent (dilution liquid) for printed matter of this invention.
More specifically, although an enlarged view is shown in FIG. 3, the supply pans 61a and 61b for the surface protective agent for printed matter, the coating rolls 64a and 64b, the switching valve 65, the pumping pump 63, and the surface for printed matter. The tank is composed of a protective agent tank 62 and a circulation path therebetween.
That is, the printed surface protective agent pumped up from the printed material surface protective agent tank 62 by the pumping pump 63 is supplied to either or both of the supply pans 61a and 61b via the switching valve (flow rate adjusting valve) 65. The liquid is sent to Next, the coating rolls 64a and 64b are applied to the surface of the printed matter moving at a line speed of 100 to 800 m / min (both front and back surfaces or either one of the front and back surfaces), for example.

According to the surface protective agent for printed matter of the present invention, water as the component (A) evaporates or permeates in the thickness direction of the printed matter instantly when applied to the surface of the printed matter. The system oil remains on the surface of the printed matter, and a surface protection member is formed. That is, the effect of preventing the surface of the printed matter from being lost is exerted by the action of the surface protecting member applied to the surface.
On the other hand, the surface protective agent for printed matter is basically constantly circulated, and the surface protective agent for printed matter that has not been used in the coating rolls 64a and 64b passes through another circulation path from the supply pans 61a and 61b to the printed matter. It is returned to the tank 62 for the surface protective agent.

4). (Iii) Process Next, the (iii) process is a formation process which forms the surface protection member 2 by drying the surface protective agent for printed matter, as shown in FIG.
Here, the average thickness of the surface protective member is preferably set to a value in the range of 0.05 to 0.5 μm.
The reason for this is that when the average thickness of the surface protective member is less than 0.05 μm, static electricity is likely to be generated in the printed matter, or the effect of preventing the rusting on the printed matter may be significantly reduced. is there.
On the other hand, when the average thickness of such a surface protective member exceeds 0.5 μm, the stickiness of the surface increases, and papers tend to stick together or wrinkles are likely to occur.
Therefore, the average thickness of the surface protection member is preferably set to a value within the range of 0.06 to 0.3 μm, and more preferably set to a value within the range of 0.07 to 0.2 μm.
The average thickness of the surface protective member can be calculated from the consumption of the surface protective agent for printed matter, or can be measured by a predetermined film thickness measuring device.

In addition, the surface protective agent for printed matter of the present invention forms a predetermined surface protective member, and even when high-speed printing is performed for a long time using a printing apparatus, it is capable of preventing rust damage on the obtained printed matter. Can be effectively demonstrated.
Then, because of the high-speed printing, surplus moisture is naturally dried, and the surface protection member is substantially formed on the printed matter (web). Therefore, it is not necessary to provide a drying device after the surface treatment device. be able to.

  Hereinafter, the present invention will be described in detail with reference to examples. Needless to say, the scope of the present invention is not limited to the following description without any particular reason.

[Example 1]
1. Preparation of surface protective agent for printed matter Hydrogenated paraffinic oil B-1 obtained by petroleum refining as component (B) with respect to 100 parts by weight of water as component (A) in a container equipped with an emulsifying stirrer 46.15 parts by weight (manufactured by Idemitsu Kosan Co., Ltd., Diana Fresia S-90) and surfactant 1 (sorbitan monooleate, represented as C-1 in Table 1) as component (C) After containing 77 parts by weight and 4.92 parts by weight of surfactant 2 (oleic acid (20) POE sorbitan, represented as C-2 in Table 1) as component (C), the mixture was stirred. The temperature was raised to 60 ° C., and 100 parts by weight of water (A) was added little by little (phase inversion emulsification method), and the whole amount was added and cooled to room temperature, average particle size 0.3 μm, viscosity: 18 mPa · Make a stock solution of surface protective agent for printed matter at sec (20 ℃) It was.
Subsequently, 900 parts of water with respect to 100 parts by weight of the total amount of the obtained surface protective agent stock solution for printed matter, and an antistatic agent (Denken Tech, Kakenstat EZ-77S, D-1 in Table 1) as component (D) 50 parts by weight were mixed and stirred to obtain a surface protective agent for printed matter of Example 1.
In addition, the compounding numerical value in Table 1 described the compounding amount of the said component after dilution adjustment as the compounding amount of water was 100 weight part.
Table 2 shows the physical properties of the paraffin oil.

2. Evaluation of surface protection agent for printed materials (1) Evaluation of rust resistance (Evaluation 1)
The cosmetic resistance of the surface protective agent for printed materials was evaluated. That is, using the offset rotary printing apparatus 100 shown in FIG. 3, printing made of a predetermined printing ink on mat paper (New V mat manufactured by Mitsubishi Paper Industries Co., Ltd.) under a printing condition of a rotational speed of 800 rpm and 50,000 sheets. A layer was formed to obtain a printed matter for evaluation.
At that time, the surface protective agent for the printed material is applied to the surface of the printed layer in the printed material for evaluation, and the surface of the printed layer is visually observed to determine whether or not a scratch is generated. Sex was evaluated. The obtained results are shown in Table 1.
A: No scratch was observed in the printing process of 50,000 sheets.
A: A scratch was observed once or twice in the printing process of 50,000 sheets.
(Triangle | delta): The cosmetic damage | wound was observed 3-4 times in the printing process of 50,000 sheets.
X: A scratch was observed 5 times or more in the printing process of 50,000 sheets.

(2) Evaluation of antistatic properties (Evaluation 2)
The antistatic property of the surface protective agent for printed matter was evaluated. That is, immediately before the homer of the offset rotary press, the electrostatic pressure on the surface of the printed material is measured using an electrostatic potential measuring device Statillon DZ-4 (manufactured by Sisid Electrostatic Co., Ltd.). Evaluated. The obtained results are shown in Table 1.
A: The measured value is 1 kV or less.
○: The measured value is 5 kV or less.
(Triangle | delta): A measured value is 20 kV or less.
X: The measured value exceeds 20 kV.

[Examples 2 to 4]
In Examples 2 to 4, the effect of the type of paraffinic oil was examined, and the results obtained are shown in Table 1.
That is, in Example 2, except that it was changed to polyalphaolefin-based synthetic paraffin oil B-2 (manufactured by Matsumura Oil, Barrel Process Oil P-380) synthesized from alpha olefin, for printed matter. A surface protective agent was created and evaluated. The obtained results are shown in Table 1.
Further, in Example 3, the surface protective agent for printed matter was changed in the same manner as in Example 1 except that it was changed to paraffinic oil B-3 (Mitsui Chemicals, Lucant HC-40) synthesized from ethylene and alpha olefin. Created and evaluated. The obtained results are shown in Table 1.
Further, in Example 4, except that it was changed to a synthetic paraffinic oil B-4 (manufactured by JX Nippon Mining & Energy, LV-100) called polybutene obtained by reacting isobutene as a main component and partly normal butene. In the same manner as in Example 1, a surface protective agent for printed materials was prepared and evaluated. The obtained results are shown in Table 1.
The physical properties of each paraffin oil are shown in Table 2.

[Examples 5 to 8]
In Examples 5 to 8, the effects of the blending amount of the paraffinic oil and the blending amount of the surfactant were examined. The obtained results are shown in Table 1.
That is, in Example 5, in the surface protective agent stock solution for printed matter, the blending amount of paraffinic oil B-1 is 75 parts by weight and the total blending amount of the surfactant is 12.5 parts by weight with respect to 100 parts by weight of water. The surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that the part was made a part.
In Example 6, in the surface protection agent stock solution for printed matter, the blending amount of paraffinic oil B-1 was 94.94 parts by weight and the total blending amount of surfactant was 15. A surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that the amount was 8 parts by weight.
Moreover, in Example 7, in the surface protective agent stock solution for printed matter, the blending amount of paraffinic oil B-1 was 120.0 parts by weight and the total blending amount of surfactant was 20.20 with respect to 100 parts by weight of water. A surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that the amount was changed to 0 part by weight.
Moreover, in Example 8, in the surface protective agent stock solution for printed matter, the blending amount of paraffinic oil B-1 was 140.2 parts by weight and the total blending amount of surfactant was 23.100 parts by weight of water. A surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that the amount was 4 parts by weight.

[Example 9]
In Example 9, the influence was examined by using a part of the surfactant (C) as a cationic surfactant. The obtained results are shown in Table 1.
That is, in Example 9, in the surface protective agent stock solution for printed matter, the blending amount of paraffinic oil B-1 was 46.15 parts by weight with respect to 100 parts by weight of water, and the total blending amount of the nonionic surfactant Was prepared in the same manner as in Example 1, and a cationic surfactant (dioleoyldimethylammonium chloride, represented as C-3 in Table 1) was 7.69 wt. A surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that the surface protective agent for printed matter was prepared by further adding and stirring parts.

[Example 10]
In Example 10, the influence of addition of a water-soluble quaternary cationic polymer (polydiallyldimethylammonium chloride, expressed as E-1 in Table 1) as a viscosity modifier of (E) was examined. The obtained results are shown in Table 1.
That is, in Example 10, in the surface protection agent stock solution for printed matter, the blending amount of paraffinic oil B-1 is 46.15 parts by weight and the total blending amount of nonionic surfactant with respect to 100 parts by weight of water. Was prepared in the same manner as in Example 1, and a water-soluble quaternary cationic polymer (polydiallyldimethylammonium chloride, expressed as E-1 in Table 1) was prepared in 9.23. A surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that a weight part was further added and stirred to prepare a surface protective agent for printed matter.

[Comparative Example 1]
In Comparative Example 1, a surface protective agent for printed matter was prepared in the same manner as in Example 1 except that purified naphthenic oil B-5 (manufactured by Idemitsu Kosan Co., Ltd., N-90) was used instead of the predetermined paraffinic oil. ,evaluated. The obtained results are shown in Table 1.
As is apparent from the results, it was found that the anti-scoring performance was insufficient because purified naphthenic oil was used instead of the predetermined paraffinic oil.
The physical properties of naphthenic oil are shown in Table 2.

[Comparative Example 2]
In Comparative Example 2, the paraffinic oil of Example 1 was used, and in the surface protection agent stock solution for printed matter, the blending amount was 6.45 parts by weight with respect to 100 parts by weight of water, and the total blending amount of the surfactant. The surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1 except that the amount was 1.08 parts by weight.
As is apparent from the results, the total blending amount of the paraffinic oil and the surfactant is excessively small, and it has been found that the anti-scoring performance is insufficient.

[Comparative Example 3]
In Comparative Example 3, instead of the predetermined paraffinic oil, a polyalphaolefin synthetic paraffin oil B-6 (manufactured by Matsumura Oil, Barrel Process Oil P-6) synthesized from a low viscosity alpha olefin was used. The surface protective agent for printed matter was prepared and evaluated in the same manner as in Example 1.
As is clear from these results, it was found that even paraffinic oil has a low viscosity and therefore lacks anti-scoring performance.

According to the surface protective agent for printed matter of the present invention, water dispersion containing a predetermined ratio of water as component (A), paraffinic oil as component (B), and surfactant as component (C), respectively. A surface protective agent for printed matter made of a non-silicone material or the like that is less likely to deactivate the platinum catalyst by constituting as a body, and is a surface of a thick printed layer or the like printed on matte paper, In addition, a surface protective agent for printed matter that can be efficiently protected can be obtained.
Moreover, according to the surface protection method for printed matter of the present invention, water containing water as component (A), predetermined paraffinic oil as component (B), and surfactant as component (C). By using the surface protective agent for printed matter as a dispersion, the matte paper has a predetermined anti-scoring property and paper alignment property for the printed matter without deactivating the platinum catalyst or the like by protecting the surface of the printed matter. It came to be able to demonstrate effectively.
Therefore, the surface protective agent for printed matter and the method for protecting the surface of printed matter of the present invention are expected to be widely used in the printing technical field such as a rotary offset printing apparatus and a gravure printing apparatus.

2: printing surface protective member 2 ': printing surface protective agent 3: printing ink 4: printing medium 5: printed material 10: paper feeder 20: infeed machine 30: printing unit 40: dryer 50: cooler 50a : Cooling roller 50b: Water spray device 60: Surface treatment device 61a, 61b: Supply pan 62: Tank 63: Pumping pump 64a, 64b: Application roll 65: Switching valve 80: Folding machine 90: Stacker 100: Offset rotary printing device

Claims (8)

A surface protective agent for printed matter, which is an aqueous dispersion containing the following components (A) to (C).
(A) Water: 100 parts by weight (B) Paraffinic oil: 0.5 to 120 parts by weight (C) Surfactant: 0.1 to 30 parts by weight (B) the printed material surface protective agent according to claim 1, characterized in that the value of more than 60%% C _P of paraffinic oil as ingredient.   The surface protective agent for printed matter according to claim 1 or 2, wherein the aniline point of the paraffinic oil as the component (B) is 100 ° C or higher. 4. The printed matter according to claim 1, wherein the paraffinic oil as the component (B) has a kinematic viscosity at 40 ° C. within a range of 10 to 150000 mm ² / s. Surface protectant.   The paraffinic oil as the component (B) is a hydrocarbon oil chemically synthesized from at least one selected from the group consisting of ethylene, alpha olefin, and isobutylene, or a hydrogenated product of petroleum paraffin oil. The surface protective agent for printed matter according to any one of claims 1 to 4, wherein the surface protective agent is for printed matter.   The surface protective agent for printed matter according to any one of claims 1 to 5, wherein the surfactant as the component (C) includes a cationic surfactant.   As a component (E), a viscosity modifier is further contained, and the content of the component (E) is within a range of 0.001 to 30 parts by weight with respect to 100 parts by weight of water as the component (A). The surface protective agent for printed matter according to any one of claims 1 to 6, wherein (A) As an aqueous dispersion containing 0.5 to 120 parts by weight of paraffinic oil and (C) 0.1 to 30 parts by weight of a surfactant with respect to 100 parts by weight of water. A method for protecting a surface of a printed material using a surface protective agent for a printed material, comprising the following steps (i) to (iii):
(I) A printing process in which printing is performed on a printing medium using a printing ink to obtain a printed material. (Ii) A coating process for applying the surface protective agent for the printed material to the surface of the printed material. (Iii) For the printed material. Formation process of drying the surface protective agent to form a surface protective member

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