JP3776420B2 - Water and oil resistant paper - Google Patents

Description

  The present invention relates to a water and oil resistant paper suitable for applications requiring water resistance and oil resistance.

Generally, high-quality paper such as ordinary copy paper or coated paper is used as a recording medium for a heat roll type electrophotographic printer, and synthetic paper having a stretched resin film layer is used for some special purposes. Yes.
Recently, there have been an increasing number of cases where water and oil resistance is required for the recording medium for electrophotographic printers, and there has been an increasing demand for products that are excellent in water and oil resistance and can be recycled from the viewpoint of resource protection. Yes.

Since ordinary copy paper and coated paper are restricted in use in applications that require water resistance and oil resistance, synthetic paper is mainly used in such applications.
Synthetic paper is composed of, for example, a laminate of a stretchable synthetic resin film layer containing a water-resistant organic or inorganic pigment on one side of a base material layer made of a water-resistant paper material (for example, Patent Documents). 1).
JP 2002-91049 A

However, since synthetic paper has a synthetic resin film layer and is excellent in water resistance and oil resistance, it is difficult to recycle because it is a petrochemical product and has a problem that it has a large impact on the environment.
Further, in the synthetic paper, there has been a problem that in a heat roll type electrophotographic printer, curling at the time of paper passing easily occurs due to heat of about 200 ° C. at the time of toner fixing, and the transportability is deteriorated.
On the other hand, for paper with water resistance and oil resistance provided on a paper base, for example, (a) a laminate on a base paper, and (b) a fluorine-based oilproof agent added internally and / or externally to the base paper. And (c) a base paper surface coated with an acrylic emulsion or a mixture of fatty acid esters.

  However, in the case of (a), there is a problem that it is difficult to recycle, and in the case of (b), in addition to the problem of recycling, there is a concern about the influence on the human body such as generation of organic fluorine gas. . Further, in the case of (c), there is a problem that a satisfactory product balanced in terms of color laser printer paper feeding ability, multicolor printability, water resistance and oil resistance cannot be obtained.

  Therefore, an object of the present invention is to provide a water- and oil-resistant paper that is excellent in printer paper feeding ability and multicolor printability and can be recycled as used paper.

In order to solve the above problems, the present inventors have intensively studied, and as a result, have come to the following invention.
According to the first aspect of the present invention, in the water and oil resistant paper, 100 parts by weight of an adhesive component containing at least one acrylic synthetic rubber having a glass transition point in the range of −40 to 25 ° C. has an average particle size of 1.0. A coating comprising 10 to 120 parts by weight of at least one inorganic pigment of ˜10.0 μm is applied to at least one side of a paper substrate , and the styrene acrylate surface sizing agent is 0.5 wt. More than parts are added,
The oil resistance according to KIT method TAPPIRC-338 is grade 4-16, and the water absorption after 2 minutes of the surface according to the water absorption test method of JISP8140 is 5 g / m ² or less.

The invention according to claim 2 is that the average particle size is 1.0 in 100 parts by weight of an adhesive component containing at least one acrylic synthetic rubber having a glass transition point in the range of −40 to 25 ° C. A coating comprising 10 to 120 parts by weight of at least one inorganic pigment of ˜10.0 μm is applied to at least one side of a paper substrate , and the styrene acrylate surface sizing agent is 0.5 wt. More than parts are added,
The coating amount of the paint is 4 to 15 g / m ² per side.

The invention according to claim 3 is the water and oil resistant paper according to claim 1 or 2,
The paint is coated on both sides of a paper substrate.

According to the first aspect of the present invention, the average particle diameter is 1.0 to 10.0 μm in 100 parts of an adhesive component containing one or more kinds of acrylic synthetic rubber having a glass transition point in the range of −40 to 25 ° C. A coating comprising 10 to 120 parts of at least one inorganic pigment is applied to at least one side of a paper substrate, has an oil resistance of 4 to 16 according to the KIT method TAPPIRC-338, and has a water absorption of JISP8140. Since the water absorption after 2 minutes of the surface according to the degree test method is 5 g / m ² or less, it becomes a water- and oil-proof paper that is excellent in printer paper feeding and multicolor printability and can be recycled as used paper.

According to invention of Claim 2, an average particle diameter is 1.0-10. In 100 weight part of adhesive components containing 1 or more types of acrylic synthetic rubber whose glass transition point is the range of -40-25 degreeC. A coating formed by blending 10 to 120 parts by weight of at least one inorganic pigment of 0 μm is applied to at least one side of a paper base, and the coating amount of the coating is 4 to 15 g / m ² per side. It is a water- and oil-resistant paper that is excellent in printer paper feeding properties and multicolor printability and that can be recycled as used paper.

Further, according to the invention described in claim 1 or 2, since 0.5 parts by weight or more of the styrene acrylate surface sizing agent is added to the paint, water-resistant and oil-resistant paper having high toner fixing property and ink setting property; Become.

According to the invention described in claim 3, it is of course possible to have the same effect as that of the invention described in claim 1 or 2, and in particular, since the paint is applied to both sides of the paper base material, Water- and oil-resistant paper with no water immersion and undulation from the surface can be obtained.

The water and oil resistant paper of the present invention is composed of a paper base material and an application layer in which a paint is applied to at least one surface of the paper base material.
(Paper substrate)
The raw materials used for the paper substrate are, for example, waste paper pulp (DIP), chemical pulp (for example, hardwood kraft pulp: LBKP, conifer kraft pulp: NBKP, etc.), mechanical pulp (for example, thermomechanical pulp: TMP, pressureized) Grand pulp: PGW, refiner ground pulp: RGP, ground pulp: GP, etc.) and non-wood pulp such as kenaf, bagasse, hemp, cotton, etc., but any pulp raw material can be used.

The coating layer has at least one kind of an average particle size of 1.0 to 10.0 μm in 100 parts by weight of an adhesive component containing at least one kind of acrylic synthetic rubber having a glass transition point in the range of −40 to 25 ° C. A coating material containing 10 to 120 parts by weight of an inorganic pigment is applied.
In addition, a surface sizing agent is appropriately added to the paint.

(Acrylic synthetic rubber)
As the acrylic synthetic rubber, for example, acrylic acid, acrylic ester, methacrylic acid, methacrylic ester, styrene acrylic, acrylamide, acrylonitrile and the like can be used. Further, synthetic rubber emulsions such as styrene / butadiene (SBR), acrylonitrile / butadiene (NBR), and butadiene (BR), and polyvinyl alcohol (PVA) may be appropriately used in combination. Among these, styrene / butadiene emulsion or acrylonitrile / butadiene emulsion is used as a synthetic rubber emulsion. Printing ink acceptability, surface strength, printing durability, blocking resistance, heat resistance, pigment fixation, etc. Is improved, and elution of the cationic resin into the fountain solution is suppressed.
The reason why the glass transition point of the acrylic synthetic rubber is in the range of -40 to 25 ° C is that when it is below -40 ° C, the oil resistance and water resistance are good, but the shape is easily changed by heat. This is because the transportability of the coating film becomes worse, and the slow viscosity of the coating film increases and shearing becomes difficult, so that the disaggregation property becomes worse. On the other hand, when the temperature exceeds 25 ° C., the disaggregation property is improved, but the film forming property is deteriorated, so that the oil resistance and water resistance are deteriorated.

(Inorganic pigment)
Examples of inorganic pigments include heavy calcium carbonate, light calcium carbonate, calcium sulfite, gypsum, talc, kaolin, clay, calcined kaolin, white carbon, amorphous silica, deramikaolin, diatomaceous earth, magnesium carbonate, titanium dioxide, Zinc oxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, or the like is used. The reason for adding the inorganic pigment is to improve the transportability of raw paper during printing.
Here, the reason why the lower limit of the content of the inorganic pigment is set to 10 parts by weight with respect to 100 parts by weight of the acrylic synthetic rubber is that, if the content is less than this, the transportability of raw paper is deteriorated. On the other hand, the reason why the upper limit is set to 120 parts by weight is that oil resistance deteriorates when the upper limit is exceeded.
Moreover, the reason why the lower limit of the particle size of the inorganic pigment is 1.0 μm is that if it is less than this, the continuity of the coating film is deteriorated and the oil resistance and water resistance are deteriorated, and the lower limit is 10.0 μm. This is because the oil resistance deteriorates and the surface unevenness becomes remarkable, and the printability and image reproducibility deteriorate.

(Surface sizing agent)
As the surface sizing agent, a styrene acrylate system can be used. When a styrene acrylate sizing agent is used, high toner fixing property and ink setting property can be imparted during printing. The surface sizing agent used for the surface layer in the present invention is of a solution type or an emulsion type. The reason why the lower limit of the addition amount of the surface sizing agent is 0.5 parts by weight is that if it is less than this, no effect is observed on the toner fixing property and printing characteristics.

(Oil resistance, water resistance)
The water and oil resistant paper of the present invention has an oil resistance of 4 to 16 according to the KIT method TAPPIRC-338.
The reason for this range is that oil resistance of 4 or less according to KIT method TAPPIRC-338 is used for oil resistance at low temperatures, and 3 or less may cause trouble in normal use in applications where oil resistance is required. Because there is sex.
In addition, the water and oil resistant paper of the present invention has a water absorption of 5.0 g / m ² or less after 20 seconds according to the water absorption test method (Cobb method) of JISP8140.
The reason for this range is that if the amount of water absorption exceeds 5.0 g / m ² , the waviness of the paper surface will increase, which may cause problems when used under conditions that require water resistance. .

In addition, as for the thickness of an application layer, it is desirable that it is 4-15 g / m < ² >. This is because if the coating amount is less than 4.0 g / m ² , the oil resistance is lower than the fourth grade and the water absorption exceeds 5.0 g / m ² .
Further, if the coating amount of the coating exceeds 15.0 g / m ² , the transportability at the time of NIP (non-impact printing) printing is deteriorated and the disaggregation property is deteriorated.
Hereinafter, examples and comparative examples of the water and oil resistant paper of this embodiment will be described.

(Composition of water and oil resistant paper)
The paper base material in Example 1 was made of LBKP.
As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. A coating containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 1.0 μm and 0.5 part by weight of a styrene acrylate emulsion as a surface sizing agent was added to one side of a paper substrate. 0.0 g / m ^{2 was} applied.

(Evaluation items and evaluation methods)
The properties of the water and oil resistant paper were evaluated based on oil resistance, water resistance, printability during offset printing, image reproducibility as NIP printability, transportability, toner fixability, and disaggregation.
Specifically, the oil resistance was evaluated by the oil resistance according to the KIT method TAPPIRC-338.
The water resistance was evaluated by the water absorption after 2 minutes according to the water absorption test method (Cobb method) of JISP8140.
Evaluations on printability, image reproducibility, transportability, toner fixing property, and disaggregation were performed in four grades: ◎: very good, ◯: good, △: slightly bad, and x: bad.
The results are shown in Table 1.
In addition, since the following Examples and Comparative Examples differ only in the composition of a coating material, only a different part is demonstrated.

As shown in Table 1, the paint is obtained by using a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a surface transition temperature (Tg) of −40 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having an average particle measurement result of 1.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of a paper substrate. 15.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. A paint containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 10.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of a paper substrate. 15.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. On one side of the paper substrate, a paint containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 10.0 μm and 0.5 part by weight of a styrene acrylate emulsion as a surface sizing agent was added. 15.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 1.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 1.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added on one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 10.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added on one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 10.0 μm and 0.5 parts by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. 15.0 g / m ² of a paper base material was coated with 120 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 1.0 μm and no surface sizing agent added.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. 120 g by weight of a combination of clay and calcium carbonate as inorganic pigments having a measurement result of 10.0 μm, and a coating containing no surface sizing agent were applied to 4.0 g / m ^{2 on} one side of the paper substrate.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is manufactured by Malvern for 80 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. and 20 parts by weight of an SBR emulsion having a transition temperature (Tg) of 5 ° C. 70 parts by weight of clay and calcium carbonate as inorganic pigments having an average particle measurement result of 5.0 μm using a laser diffraction particle size distribution analyzer (Mastersizer 2000), and a styrene acrylate emulsion as a surface sizing agent in an amount of 0. The coating material added with 5 parts by weight was applied to 7.0 g / m ^{2 on} one side of the paper substrate.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is Malvern, based on 80 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. and 20 parts by weight of an NBR emulsion having a transition temperature (Tg) of −5 ° C. 70 parts by weight of clay and calcium carbonate as inorganic pigments having an average particle measurement result of 5.0 μm with a laser diffraction particle size distribution analyzer (Mastersizer 2000) manufactured by the manufacturer, and 0 styrene acrylate emulsion as a surface sizing agent The paint added by 5 parts by weight was applied to 7.0 g / m ^{2 on} one side of the paper substrate.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating composition is a laser diffraction particle size distribution measurement made by Malvern for 80 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. and 20 parts by weight of polyvinyl alcohol (PVA). A paint comprising 70 parts by weight of clay and calcium carbonate as inorganic pigments having an average particle measurement result of 5.0 μm by an apparatus (Mastersizer 2000) and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent. Then, 7.0 g / m ^{2 was} applied to one side of the paper substrate.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. A coating containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 1.0 μm and 0.5 parts by weight of styrene acrylate emulsion as a surface sizing agent was added to both sides of the paper substrate. 15.0 g / m ² (total 30.0 g / m ² ) was applied per side.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. One side of the paper base material was coated with 120 parts by weight of clay and calcium carbonate as inorganic pigments with a measurement result of 10.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent. per 15.0 g / m ² (total 30.0 g / m ²⁾ was applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
Moreover, the comparative example corresponding to the said Example is demonstrated below.
[Comparative Example 1]

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. A paint containing 9 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 1.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of a paper substrate. 15.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 2]

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 121 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 10.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added on one side of the paper base. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 3]

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 0.9 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added on one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 4]

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 11.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 5]

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 25 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 10.0 μm and 0.5 part by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 6]

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −40 ° C. A coating containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 1.0 μm and 0.5 part by weight of a styrene acrylate emulsion as a surface sizing agent was added to one side of a paper substrate. 16.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 7]

As shown in Table 1, the paint was averaged by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of −41 ° C. A coating containing 10 parts by weight of clay and calcium carbonate as inorganic pigments having a particle measurement result of 1.0 μm and 0.5 part by weight of a styrene acrylate emulsion as a surface sizing agent was added to one side of a paper substrate. 15.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.
[Comparative Example 8]

As shown in Table 1, the coating material is an average particle by a laser diffraction particle size distribution measuring device (Mastersizer 2000) manufactured by Malvern with respect to 100 parts by weight of an acrylic copolymer emulsion having a transition temperature (Tg) of 26 ° C. A coating containing 120 parts by weight of clay and calcium carbonate as inorganic pigments having a measurement result of 10.0 μm and 0.5 parts by weight of styrene acrylate emulsion as a surface sizing agent was added to one side of the paper substrate. 0.0 g / m ^{2 was} applied.
Evaluation items and evaluation methods were the same as in Example 1. The results are shown in Table 1.

(Influence of transition temperature of acrylic emulsion)
Comparing Example 1 and Comparative Example 7, it can be seen that when the transition temperature is lower than −40 ° C., the transportability during NIP printing is deteriorated. Moreover, when Example 8 and Comparative Example 8 are compared, it can be seen that when the transition temperature exceeds 26 ° C., the oil resistance is lower than the fourth grade and the water absorption exceeds 5.0 g / m ² .

(Influence of added amount of inorganic pigment)
When Example 1 and Comparative Example 1 are compared, as shown in Tables 1 and 2, it can be seen that when the added amount of the inorganic pigment is less than 10 parts by weight, the transportability during NIP printing is deteriorated. Further, when Example 8 and Comparative Example 2 are compared, as shown in Tables 1 and 2, when the amount of the inorganic pigment added exceeds 120 parts by weight, the oil resistance is less than the fourth grade and the water absorption is 5. It turns out that it will exceed 0 g / m < ² >.

(Influence of average particle size of inorganic pigment)
Comparing Example 5 and Example 7, as shown in Tables 1 and 2, it can be seen that the smaller the average particle diameter, the better the oil resistance, water resistance, printability, and image reproducibility. When Example 8 and Comparative Example 4 are compared, as shown in Tables 1 and 2, when the average particle size exceeds 10.0 μm, the oil resistance is less than Grade 4 at a coating amount of 4.0 g / m ² . Moreover, it turns out that a water absorption will also exceed 5.0 g / m < ² >. When Example 6 and Comparative Example 3 are compared, as shown in Tables 1 and 2, when the average particle size is less than 1.0 μm, the oil resistance is less than grade 4, and the water absorption is also 5.0 g / m ² . It can be seen that the printability and printability deteriorate as well.

(Influence of coating amount)
When Example 8 and Comparative Example 5 are compared, as shown in Tables 1 and 2, when the coating amount of the paint is less than 4.0 g / m ² , the oil resistance is less than the fourth grade, and the water absorption is also 5. It turns out that it will exceed 0 g / m < ² >. Further, when Example 1 and Comparative Example 6 are compared, as shown in Tables 1 and 2, if the coating amount of the coating exceeds 15.0 g / m ² , the transportability during NIP printing is deteriorated. It turns out that disaggregation property worsens with it.

(Influence of surface sizing agent)
Comparing Example 2 and Example 9, as shown in Table 1, by adding 0.5 parts by weight of the surface sizing agent to the paint, the oil resistance increased from the 13th grade to the 15th grade, and the water absorption was 0. It is found that the image reproducibility and the toner fixing property are improved in addition to the oil resistance and water resistance being improved from 9.9 g / m ² to 0.1 g / m ² . Further, when Example 6 and Example 10 are compared, as shown in Table 1, by adding 0.5 part by weight of the surface sizing agent to the coating material, the oil resistance is increased from the fourth grade to the fifth grade, and the water absorption is also increased. From 4.4 g / m ² to 3.9 g / m ² , it can be seen that in addition to improved oil resistance and water resistance, image reproducibility and toner fixability are improved.

(Effect of acrylic synthetic rubber combination)
As shown in Examples 11 to 13, the acrylic synthetic rubber is not only an acrylic emulsion but also an SBR emulsion, an NBR emulsion, and a PVA, which can be combined appropriately with oil resistance, water resistance, printability, NIP printability, It can be seen that the water- and oil-resistant paper has excellent disaggregation properties.

According to the water- and oil-resistant paper of the first embodiment described above, the average particle diameter is 100 parts in the adhesive component containing one or more kinds of acrylic synthetic rubber having a glass transition point in the range of −40 to 25 ° C. Is coated with at least one surface of a paper base material and has an oil resistance of 4 according to KIT method TAPPIRC-338. Since the water absorption after 2 minutes according to JISP 8140 is 5 g / m ² or less, it is excellent in offset printability and NIP printability, and can be recycled as used paper. It becomes paper.

Since the coating amount of the coating material is 4 to 15 g / m ² per side, it becomes a water- and oil-resistant paper that is excellent in printer paper feeding property and multicolor printability and can be recycled as used paper.
Since the paint is applied to both sides of the paper base material, it can be made a water-resistant and oil-resistant paper free from water immersion and undulation from the cut surface.
Since 0.5 parts by weight or more of a styrene acrylate surface sizing agent is added to the coating, it becomes a water / oil resistant paper excellent in oil resistance, water resistance and printability.

Claims (3)

At least one inorganic pigment having an average particle diameter of 1.0 to 10.0 μm is added to 100 parts by weight of an adhesive component containing one or more acrylic synthetic rubbers having a glass transition point in the range of −40 to 25 ° C. A paint comprising 10 to 120 parts by weight is applied to at least one side of a paper base, and 0.5 parts by weight or more of a styrene acrylate surface sizing agent is added to the paint,
Water resistance oil resistant paper characterized by oil resistance 4 to 16 according to KIT method TAPPIRC-338 and water absorption after 2 minutes of surface according to JISP 8140 water absorption test method of 5 g / m ² or less . At least one inorganic pigment having an average particle diameter of 1.0 to 10.0 μm is added to 100 parts by weight of an adhesive component containing one or more acrylic synthetic rubbers having a glass transition point in the range of −40 to 25 ° C. A paint comprising 10 to 120 parts by weight is applied to at least one side of a paper base, and 0.5 parts by weight or more of a styrene acrylate surface sizing agent is added to the paint,
A water / oil resistant paper characterized in that the coating amount of the paint is 4 to 15 g / m ² per side.   The water- and oil-resistant paper according to claim 1 or 2, wherein the paint is coated on both sides of a paper substrate.