JPH04308299A - Production of paper mixed with colored resin particle - Google Patents

Abstract

PURPOSE:To extremely simply form a spotted pattern having an excellent design on the surface of paper or a paper product. CONSTITUTION:A water-dispersible fiber material is dispersed into water to give a slurry of paper stock, into which liquid colored resin particles are suspended or dispersed and paper is made.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing paper mixed with colored resin particles, which is useful for applications requiring decorative or design properties.

0002

[Prior Art] Conventionally, paper or paper products used for purposes such as wallpaper, fusuma paper, lampshades, wrapping paper, and book covers have been required to have excellent decorative or design properties. , For this reason, patterns, figures, etc. are generally formed on the surface of the paper, and methods for forming patterns in this case include: (1) printing, and (2) adding colored particles to the paper stock slurry during paper manufacturing. , a method is known in which a particulate pattern-forming material such as a foil-like powder is dispersed, and then this is mixed and paper-sheeted to directly produce paper with a spotted pattern formed using the pattern-forming material.

[0003] Among the methods for forming patterns, figures, etc. mentioned above, the printing method (2) has the advantage of being able to easily form even complex patterns, and is currently the most commonly practiced method. There is a problem that a device for this purpose is required, leading to an increase in cost. On the other hand, the method (■) above does not require post-processing as in the case of (■), and pattern formation can be carried out at the same time as paper making.
This is an extremely economical method.

However, in the method (2) above, when colored particles are used as the pattern forming material, since the colored particles are solid particles, the mixed colored particles are exposed on the surface of the paper, impairing the smoothness of the paper surface. The problem is that it is easy to interfere. In particular, in order to obtain a speckled pattern with excellent design, it is preferable to use relatively large colored particles, but in this case, there is a problem that the smoothness further deteriorates, and therefore, the above At present, it is extremely difficult to produce patterned paper with excellent smoothness and design using the mixed papermaking method.

[0005] In this regard, even with the method (2) above, if a foil-like powder is used as the pattern-forming material, a relatively large spotted pattern can be formed without impairing the smoothness of the paper. It is not necessarily an advantageous method because it requires a complicated process to produce the powder.

[0006]

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned current situation, and aims to solve the above-mentioned problems particularly in the case of producing patterned paper by the method (ii) above. The object of the present invention is to provide a method for easily manufacturing paper with speckled patterns of arbitrary size through extremely simple steps without impairing the smoothness of the paper.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention involves making paper by suspending or dispersing liquid colored resin particles in a stock slurry made by dispersing water-dispersible fiber materials in water. The present invention relates to a method for producing paper mixed with colored resin particles, which is characterized by the following.

[0008] The present invention having the above structure is characterized in that liquid colored resin particles are used as the colored resin particles forming the spotted pattern, and these are mixed together with paper stock slurry. When particles are mixed,
The colored resin particles deform into a flat shape on the surface of the paper, forming a speckled pattern with excellent design without impairing the smoothness of the paper surface.

The water-dispersible fiber material used in the present invention is not particularly limited, and may be pulp or fiber commonly used in the paper manufacturing industry. Specific examples include wood, cotton, and straw. , pagus, hemp, jute,
Pulp or fibers manufactured from kozo, gampi, mitsumata, oak, etc., and waste paper pulp or fibers of these,
Alternatively, synthetic pulp etc. can be exemplified. Also,
These pulps or fibers can be dispersed or suspended in water according to a conventional method and used as a stock slurry.

The liquid colored resin particles used in the present invention include a liquid material obtained by mixing a synthetic resin solution or emulsion in an organic solvent with a coloring material such as a pigment or dye.
It is dispersed or suspended in the form of droplets in a paper stock slurry. Specifically, when the liquid material contains an organic solvent solution of a synthetic resin, a water-insoluble organic solvent is used. The particles thus formed are dispersed as liquid particles without being dissolved in the aqueous paper stock slurry,
In addition, when the liquid particles contain a synthetic resin emulsion, if at least the surface layer of the particles is made of a gelled material, it will not dissolve in the aqueous paper stock slurry and will be dispersed in a stable droplet state. can be done.

[0011] Since the liquid colored resin particles described above are used after being dispersed in an aqueous paper stock slurry, the liquid particles are preferably also aqueous. Therefore, in the present invention, a synthetic resin emulsion is included, It is preferable to use liquid particles whose surface layer is composed of a gelled material.

Gelation in liquid particles containing the synthetic resin emulsion refers to the combination of a hydrophilic colloid-forming substance such as polyvinyl alcohol and an insolubilizing agent (gelling agent) such as boric acid that can insolubilize the colloidal substance. agent)
This means that a kind of three-dimensional network structure is formed by the interaction of the two, and the gelation reaction occurs on the surface layer of the liquid particle containing the synthetic resin emulsion, and a gelation film is formed on the particle surface. It is formed. Therefore, liquid colored resin particles having at least a surface layer formed of a gelling film are prepared by mixing a liquid material containing a hydrophilic colloid-forming substance, a synthetic resin emulsion, and a coloring agent such as a pigment or dye in an aqueous medium containing a gelling agent. It can be prepared by mixing and dispersing in

The synthetic resin emulsion used for the liquid colored resin particles includes polyvinyl acetate, acrylic resin, polystyrene, polyacrylonitrile, Beova (branched fatty acid vinyl ester polymer), natural or synthetic rubber, or a copolymer thereof. Generally commercially available synthetic resin emulsions such as emulsions can be widely used.

Specific examples of colloid-forming substances that can be used in combination with the synthetic resin emulsion include cellulose derivatives, polyethylene oxide, polyvinyl alcohol, and natural polymer compounds (casein, starch, galactomannone, guar gum, locust bean gum, etc.). )
is preferably used, and specific examples of gelling agents used in combination with these colloid-forming substances include magnesium montmorillonite clay, sodium pentachlorophenol, tannic acid, titanium lactate, calcium chloride, boric acid or its salts, etc. .

The above-mentioned colloid-forming substance and gelling agent can be used alone or in a mixture of two or more, and the colloid-forming substance is usually used in an amount of 0.05 to 5% by weight based on the polymer of the synthetic resin emulsion. %, and if necessary, components such as a dispersant, thickener, film-forming aid, antifoaming agent, etc. can be used together with the colloid-forming substance.

The particle size of the liquid colored resin particles dispersed in the paper stock slurry is not particularly limited, but is
．． The particle diameter is preferably in the range of 0.05 to 10 mm. If the particle size is less than 0.05 mm, the particles are too small to be recognized as a speckled pattern, and in extreme cases, it is simply a pigment,
You will only be able to obtain the same level of coloring as if you colored it with a coloring agent such as dye. On the other hand, if the particle size is larger than 10 mm, it is difficult to control the particle size, and the particles tend to break in the stock slurry, causing problems such as pattern change.

[0017] The liquid colored resin particles may be made into liquid particles in advance and then added to the paper stock slurry, or a liquid substance may be added to the paper stock slurry and the particles may be mixed in the slurry by mechanical means such as stirring. It is also possible to make it . In addition, the particle size of the liquid particles can be controlled to any size by changing the viscosity and stirring speed of the liquid. For example, if the viscosity of the liquid is increased, the liquid particles will be larger, and the stirring speed will be increased. This can produce small liquid particles. At that time, in order to maintain the dispersion stability of the liquid particles, any dispersion stabilizer may be used in combination with the paper stock slurry.

In the present invention, only one type of liquid colored resin particles may be mixed in the paper stock slurry, but by using a plurality of colored particles with different tones, a multicolored spotted pattern is formed, and the particles By using a plurality of colored particles of different sizes, a pattern is formed that is a combination of large and small spots.Furthermore, the combination of these two adds variety to the spot pattern in addition to the multicolored color, creating an extremely decorative pattern. This method is particularly preferred in the present invention because a highly patterned paper can be obtained.

The method for producing the paper mixed with colored resin particles of the present invention is not a special method, and any conventional method can be used. Specifically, in the paper stock slurry containing the water-dispersible fiber material,
Paper with a spotted pattern is formed by dispersing the desired amount of the liquid colored resin particles, then making paper by an appropriate method such as machine or hand making, and if necessary, performing treatments such as pressing and dehydration, and drying. is obtained. Note that the amount of liquid colored resin particles mixed into the paper stock slurry can be set appropriately depending on the desired spotted pattern. For example, when attempting to form a dense spotted pattern, If it is desired to form a sparse spotted pattern by increasing the amount of the liquid colored resin particles mixed, it is sufficient to reduce the amount of the liquid colored resin particles mixed. Generally, the amount of liquid colored resin particles can range from 1 to 500 parts by weight per 100 parts by weight of pulp or fibers contained in the paper stock slurry.

[0020] Paper or paper products mixed with colored resin particles as described above have a speckled pattern with extremely excellent design properties, and can be used as wallpaper, sliding paper, lampshades, etc.
It can be suitably used for wrapping paper, book covers, and other applications requiring decorative or design properties.

[0021]

[Examples] The present invention will be explained in more detail below with reference to Examples.

(1) Preparation of gelling agent; 25 g of magnesium montmorillonite clay (4% dispersion in water), 5 g of ammonium biborate 5% aqueous solution, and 25 g of 1% sodium carboxymethyl cellulose aqueous solution were blended and mixed with stirring. After that, 45 g of water was further mixed.

(2) Preparation of red synthetic resin emulsion base; 38 g of acrylic resin emulsion (Nippon Acrylic Chemical Co., Ltd., Primal AC-34, non-volatile content 46%) and nonionic guar rubber derivative [Steinhall & Co. Hall & Co.
), Jaguar J2S1] 1.5% aqueous solution 28
．． A pigment dispersion liquid consisting of 15 g of red iron oxide pigment, 1 g of a dispersant (manufactured by Nippon Acrylic Chemical Co., Ltd., Orotane 731), and 17.5 g of water was added and mixed into the 5 g mixture.

(3) Preparation of liquid colored resin particles;
40 g of the gelling agent in 1) is mixed with 60 g of the red synthetic resin emulsion base in (2) above, and the particles formed by this red synthetic resin emulsion base have a particle size of 3.
Liquid colored resin particles were prepared by stirring gently until the particle size became ~5 mm.

(4) Production of mixed paper; 10 g of Kozo fiber,
Add 10 g of the liquid colored resin particles described in (3) above to a paper stock slurry consisting of 100 g of anti-settling agent and 5 kg of water, mix thoroughly, then form the paper using a 40-mesh wire mesh, and dehydrate by lightly pressing. The mixture was dried at 80° C. for 30 minutes to obtain paper mixed with colored resin particles.

[0026] The mixed paper obtained as described above has a red spotted pattern with excellent design properties, and also has
The smoothness of the paper surface was also excellent.

[0027]

[Effects of the Invention] The method for producing paper mixed with colored resin particles according to the present invention is a simple method that only involves mixing liquid colored resin particles in a paper stock slurry and then making paper.
It has the advantage that patterned paper can be produced extremely economically, and in addition, the patterned paper obtained has excellent smoothness and design, making it an extremely excellent method for producing patterned paper. ing.

Claims (3)

[Claims] 1. A method for producing colored resin particle-containing paper, which comprises suspending or dispersing liquid colored resin particles in a paper stock slurry prepared by dispersing a water-dispersible fiber material in water. 2. The liquid colored resin particles have a particle size of 0.
2. The method for producing paper mixed with colored resin particles according to claim 1, wherein the particle size is 0.05 to 10 mm. 3. The colored resin particles according to claim 1, wherein the liquid colored resin particles are composed of droplets containing an emulsion polymer and a coloring material, and at least a surface layer of the droplets is composed of a gelled material. Method for manufacturing mixed paper.