JPH10183495A - Water-repellent printing paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-repellent printing paper having such a water- repellent effect as not to prevent the use thereof at the outdoor in the rain, and simultaneously not being slippery and being excellent in printing operability. SOLUTION: This water-repellent printing paper is obtained by impregnating a water-repellent agent consisting essentially of an alkali salt of a maleic- modified petroleum resin, and a liquid paraffin into a supporter consisting essentially of a pulp fiber, or applying the water-repellent agent on the supporter to form the printing paper having R8-R10 water repellency based on JIS P8137 and 0.27-0.55 static friction coefficient based on JIS P8147.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-repellent printing paper having excellent water repellency and at the same time having ordinary printing workability.

[0002]

2. Description of the Related Art Conventionally, to impart water repellency to paper,
A wax emulsion, an organic silicon derivative, an olefin resin or the like is impregnated or coated with equipment such as a size press.

[0003] These water-repellent papers have no problem in printability except for printing workability, but have a characteristic that the paper is slippery, which causes various troubles in paper processing. Due to problems such as defects and poor paper alignment, they have not been used for a wide range of applications for printing.

However, among the above-mentioned water repellents, olefin resins have a relatively non-slip property. However, when the water content at the time of production is 5 to 7% by weight as in the case of ordinary printing paper, the JIS resin is not used.
In order to obtain a water repellency R8 or more under the measurement conditions of P8137, a large amount of a water repellent had to be used. As a result, the paper became slippery and was not used for a wide range of printing paper.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing paper which has a water-repellent effect without obstacles to outdoor use in rainy weather, is hardly slippery, and has excellent printing workability. I do.

[0006]

Means for Solving the Problems The present inventors have focused on a water-repellent agent which is composed mainly of a maleic petroleum resin alkali salt which is relatively hard to slip and a liquid paraffin as a main component among water-repellent agents. As a result of a detailed investigation and study of the results, by controlling the water content during production, it is possible to obtain printing paper that exhibits high water repellency with a small amount of water repellent and at the same time has slipperiness that can be used for normal printing work And completed the present invention.

According to the present invention, a support containing pulp fibers as a main component is impregnated or coated with a water repellent containing a maleated petroleum resin alkali salt and liquid paraffin as a main component, and after drying, the water content is 2. After drying to 5 to 3.5% by weight, the water repellency according to JIS P8137 is R8 to R10.
And the coefficient of static friction according to JIS P8147 is 0.
27 to 0.55.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process for producing a printing paper by impregnating or applying a water repellent containing a maleated petroleum resin potassium salt and liquid paraffin to a paper together with a known surface sizing agent by a size press. At the same time, it is a water-repellent printing paper having both water repellency and slip resistance (static friction coefficient capable of normal printing) by strengthening drying conditions and keeping the water content immediately after production low. The water repellency of the water repellent printing paper of the present invention is R8 or more, and if it is less than R8, the water repellency is insufficient for applications intended for outdoor use in rainy weather.

The support mainly composed of pulp fibers is a raw material generally used for high quality paper, and a paper not coated with a size press obtained using a paper machine. That is, the base paper pulp may be either bleached or unbleached softwood or hardwood, and does not include the presence or absence of talc, calcium carbonate, or the like as a filler, and other paper strength enhancers, coloring dyes, internal sizing agents, and the like. You may. Usually, rice tsubo is about 35 to 300 g / m ² .

The water repellent containing maleic petroleum resin alkali salt and liquid paraffin as main components used in the present invention may be potassium maleate petroleum resin or sodium salt 70%.
90 to 90% by weight, 10 to 30% by weight of liquid paraffin mixed, melted or dissolved with an organic solvent, for example, 1 to 5% by weight of a nonionic emulsifier, polyoxyethylene steacryl ether, and tall oil fatty acid as a protective colloid agent Of 5 to 15% by weight, all of which are included in the total solid content, and emulsified and dispersed in water.

Impregnation of the water-repellent printing paper of the present invention with a water-repellent agent
The application amount is adjusted to an appropriate amount in the range of 0.1 to 1.0 g / m ² (one side) in terms of solid content and applied. Coating amount 0.1 g / m ²
If it is less than 1.0, the water repellency is insufficient, and if it exceeds 1.0 g / m ² , the coefficient of static friction becomes small and the printing workability deteriorates. The coefficient of static friction is 0.27 to 0.55, but if it is less than 0.27, there is a problem in terms of printing workability, such as paper slipping, and the paper supply pile of a printing machine is broken, and conversely, a value exceeding 0.55 Is difficult to achieve because a water repellent is applied, and a problem that several printing papers are simultaneously conveyed is not preferable.

In the present invention, in order to keep the coefficient of static friction low, the coating amount is low, and at the same time, in order to obtain high water repellency, the water content of the water repellent printing paper is dried after drying (immediately after production).
The content is adjusted to 5 to 3.5% by weight, but if it exceeds 3.5% by weight, it becomes difficult to increase the water repellency of the paper surface, and if it is less than 2.5% by weight, the load on the dryer increases. This is a problem in terms of equipment cost and energy cost.

The water-repellent printing paper is preferably subjected to a smoothing treatment after drying by using an on-machine calender, a super calender or the like. The surface Beck smoothness is preferably in the range of 35 to 100 seconds. If it is less than 35 seconds, it is difficult to use it as a printing paper in a wide range of applications. A value exceeding 100 seconds is an unnecessarily large value for printability. In addition, the load on the calendar increases, which is not preferable.

The water content of the water-repellent printing paper of the present invention after drying refers to the water content on the reel of the paper machine, and the total weight of the test piece of the water-repellent printing paper is used as a denominator, and the weight of the water content is used as the denominator. It is a numerical value obtained as a numerator. Measurement is JIS P
According to 8127.

The values of water repellency, Beck smoothness, and coefficient of static friction of the present invention are determined by JI after sampling a paper test piece.
It is a numerical value obtained by measuring after standing in a room of constant temperature and humidity according to SP8111 and reaching a steady state, and the paper moisture at the time of measurement is 5.5%.

[0016]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In addition,% and part show weight% and weight part unless there is particular notice.

Comparative Example The following chemicals were added to bleached kraft pulp made of 100% hardwood at the following ratios to prepare papermaking raw materials, and high quality paper was made using a known fourdrinier multi-cylinder paper machine. Further, the following water repellents are blended with the following surface sizing agents, and the solid content (solid content of only the water generating agent) is applied by a size press at 0.8 and 1.0 g / m ² (single-sided conversion), respectively, immediately after production. With a water content of 3.0 and 5.0% and a basis weight of 100
g / m ² , on-machine calendar processing and Beck smoothness 4
Paper of 0 seconds (target value) was obtained. The water repellency, the coefficient of static friction, the smoothness, and the printing workability of this paper were as shown in Table 1.

<Formulation of Papermaking Raw Material> LBKP 100 parts Sponge (wet paper strength enhancer, manufactured by Nippon PMC) 0.4 part Poristron (wet paper strength enhancer, Arakawa Chemical) 0.3-0.4 parts SPS (Sizing agent, manufactured by Arakawa Chemical) 0.26 to 0.3 parts Synthetic band (flocculant) 1.5 parts

<Surface sizing agent> PVA (manufactured by Kuraray Chemical) 49% Polymalon (manufactured by Arakawa Chemical) 4% Water repellent (any of the following-47%) * After diluting the above chemical with water, the above solid content weight ratio Mix with.

<Water repellent> Wax emulsion: Rastor SB manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Organic silicon derivative: TSW manufactured by Toshiba Silicone
831 Water repellent containing 84% maleated petroleum resin potassium salt and 16% liquid paraffin

However, the printing workability was evaluated according to the following criteria using a normal offset four-color machine. ○ No problem. △ When the packaging of the printing paper is opened and set in the printing machine, printing is possible although there is a slight slip at the boundary (serial) between the packaging units of the printing paper. × When the packaging of the printing paper is opened and set on the printing press, the boundary (sequence) of the printing paper packaging unit is largely slipped, and the set is disturbed and printing is impossible.

[0022]

[Table 1]

From Table 1, it can be seen that at a water content of 5.0% at the time of production, in order to obtain a water repellency of R8 or more, the coating amount is 0.8 g / m ^2.
Is required, in which case the coefficient of static friction is 0.15 to 0.5.
26, and the workability during printing deteriorated. Among the water repellents, the water repellent of the present invention has a relatively high coefficient of static friction, and the deterioration of printing workability is small.

(Example) Using a well-known fourdrinier multi-cylinder paper machine, blending papermaking raw materials according to the same formulation as in the comparative example, papermaking, and using a water-repellent agent to form a surface using the same formulation as in the comparative example. A sizing agent was prepared, and 0.3 to 1.0 g / m ² (one-sided conversion) was applied as a solid content of only a water repellent by a size press, and the water content immediately after production was set to 3.0 to 3.5%. , Basis weight 100g
/ M ² and a paper having a Beck smoothness of 40 seconds (target value). Table 2 shows the results of evaluating the water repellency, the coefficient of static friction, the smoothness, and the printing workability of the paper.

[0025]

[Table 2]

As is clear from Tables 1 and 2, the water repellency was increased with the same amount of the water repellent applied by reducing the water content during the production. That is, the water content at the time of manufacture was 4.0.
%, The coating amount of the water repellent must be 0.8 g / m ² or more in order to obtain a water repellency of R8 or more, so that the coefficient of static friction becomes small and the printing workability deteriorates. On the other hand, when the water content is 3.5% or less, the amount of the water repellent applied is 0.5 g.
/ M ² or less, the water repellency was R8 or more, the static friction coefficient was 0.32 to 0.45, and the printing workability was good.

[0027]

The water-repellent printing paper of the present invention has a large coefficient of static friction on the paper surface, has a printing workability comparable to that of ordinary printing paper, enables a wide range of printing, and has excellent water repellency for outdoor use. It can be used for a wide range of applications such as map paper, field paper, golf score cards, posters and labels.

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[Procedure amendment]

[Submission date] August 11, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method for producing a printing paper by impregnating or applying a water repellent containing a maleated petroleum resin alkali salt and liquid paraffin to a paper together with a known surface sizing agent by a size press. At the same time, it is a water-repellent printing paper having both water repellency and slip resistance (static friction coefficient capable of normal printing) by strengthening drying conditions and keeping the water content immediately after production low. The water repellency of the water repellent printing paper of the present invention is R8 or more, and if it is less than R8, the water repellency is insufficient for applications intended for outdoor use in rainy weather.

Claims (1)

[Claims] 1. A support comprising pulp fibers as a main component is impregnated or coated with a water repellent comprising a maleated petroleum resin alkali salt and liquid paraffin as a main component.
Water repellency based on R8 to R10 and JIS P81
47. A water-repellent printing paper characterized by having a static friction coefficient based on No. 47 of 0.27 to 0.55.