KR900003921B1 - Preparation of mat film for drawing - Google Patents

Abstract

coating polyvinyl butyral resin of formula (I) which has 200-700 of degree of polymn. and 50-70 mole % of degree of butylation, on the base film, and drying; coating a mat compsn. thereon; and drying at 130-170≰C for 2-5 min.. The mat compsn. is obtd. by dispesing 20-40 wt.% of mat agent w.r.t. 100 wt.% mixt. of water soluble resin and water insoluble resin. In formula, l:m:n is 6-7:1:2-3.

Description

Manufacturing method of matte film for drawing

The present invention relates to a manufacturing method of a mat film for drawing, and more particularly, by forming an adhesive layer between the support film and the mat layer, and at the same time using a mixture of a water-soluble resin and a water-resistant resin as the binder resin of the mat layer, The present invention relates to a manufacturing method of a mating film for drafting to improve the adhesion between the film and the mat layer and to greatly improve the writing ability of a pencil or a water-based ink for drawing.

Conventionally, in order to roughen the surface in order to impart handwriting on a synthetic resin film, a sand spray method, an emboss method (hereinafter referred to as a first method), organic Surface etching method using a solvent (hereinafter referred to as a second method), a mat composition prepared by dispersing a mat agent, inorganic and organic particles such as CaCO ₃ , SiO ₂ , TiO ₂ in a suitable binder resin material The method of apply | coating on a support film (henceforth 3rd method), etc. are known.

However, these conventional techniques have various problems that need to be improved, respectively. For example, in the first method, the writing ability of the pencil is good, but the writing ability of the fountain pen or the water-based ink for drawing is very poor, so that it is rubbed by hand after writing. When the ink is erased or smeared, the second method also lacks roughening of the synthetic resin film, so writing ability for pencils and drawing inks is insufficient, especially when etching harmful to the human body. There was a problem to use.

In order to solve such a problem, there is a third method as a proposed technique, but in this method, the physical properties of the processed mat film vary greatly according to the properties of the binder resin used to disperse the mat agent. Hydrophobic polymers such as UK Patent No. 1,047,697 using vinylidene chloride copolymers, UK Patent No. 3,353,958 using polymethylmethacrylate, and US Patent No. 3,627,563 using polyesters or polyesteramides. When the matte film is used as the resin material, the bonding force between the mat layer and the support film is relatively good, but there are many disadvantages such as poor writeability to the aqueous ink.

On the contrary, when a hydrophilic resin such as polyvinyl alcohol or gelatin is used as the binder resin, such as Japanese Patent Application No. 53-89169, the writing ability of the pencil and the aqueous ink for drawing is improved, but the adhesion between the support film and the mat layer is improved. When using a pencil with high hardness or rubbing too hard with an eraser, the matte layer may peel off from the supporting film, and in particular, when the mat film is left with each other overlapped under high temperature and high humidity conditions, the mat Since the film absorbs the surrounding moisture, there is a problem that blocking occurs.

Thus, the present invention is to solve the problems of the prior art at the same time excellent in the adhesive force between the mat layer and the support film and the writing ability to pencil and water-based ink, especially for drafting does not occur even under high temperature and high humidity conditions Its purpose is to provide a method for producing a matte film.

Hereinafter, the present invention will be described in detail.

The present invention is to apply a mat composition on the support film to produce a mat film for drafting, by applying a polyvinyl butyral (PVB) resin having a polymerization degree of 200 to 700 represented by the following general formula (I) on the support film After drying, the mat composition is applied thereon, and the mat composition is dispersed by dispersing 20 to 40% by weight of the mat agent with respect to 100% by weight of the mixture of water-soluble and water-resistant resins. It is a method for producing a draft matte film to be dried for 5 minutes.

In the above formula, 1: m: n is 6-7: 1: 1-2.

Hereinafter, the present invention will be described in more detail.

In the present invention, the adhesive layer formed in order to improve the adhesion of the support film wave mat layer is made of PVB resin represented by the general formula (I), wherein the resin has a polymerization degree of 200 to 700, If the degree of polymerization of the PVB resin is 200 or less, the softening point is too low to melt the adhesive layer at high temperature, on the contrary, if the degree of polymerization of the PVB resin is 700 or more, the adhesive force connecting the support film and the mat layer is weak. not. In addition, the adhesion strength of the PVB resin is also changed depending on the degree of butylation at the time of polymerization, the PVB resin used in the present invention is most suitable that the butylation degree is 50 to 70 mol%. If the degree of butylation of the PVB resin is 50 mol% or less, the adhesive strength with the support film is weak, and if the butylation degree is 70 mol% or more, the adhesive strength with the mat layer is weakened.

PVB resins that can be used as the adhesive layer of the matte film according to the present invention are currently commercially available in various products, for example, Esleck BL-1, BL-2, BL-3, BL- S, BX-L, BM-1, BM-2, BM-5, BM-S, etc. Among these, it is preferable to use Esleck BL-S or BM-S.

In this way, after the PVB resin is applied on the supporting film to form an adhesive layer, the adhesive layer may be dried and then coated on the mat. In the present invention, the mat layer that greatly influences the writing characteristics of the mat film may be a water-soluble resin. It is composed of a mat composition by dispersing a suitable mat agent in a mixture of water resistant resins. At this time, as the water-soluble resin, polyvinyl alcohol (PVA), starch, carboxyl methyl cellulose, methyl cellulose, sodium alginate, and the like may be used. It is good. On the other hand, when the water-soluble resin and the water-resistant resin is mixed, the amount of water-soluble resin is mixed to 7 to 15 times with respect to the water-resistant resin, preferably, the amount of the water-soluble resin is 8 to 10 times. If the amount of the water-soluble resin is less than 7 times, the writability for the aqueous ink becomes poor, on the contrary, if the amount of the water-soluble resin is 15 times or more, the water resistance may be poor.

On the other hand, in the present invention, as the mat agent, inorganic particles such as SiO ₂ , TiO ₂ , Al ₂ O ₃ , caolin, and the like are generally used. In this case, the inorganic particles may have a particle diameter of 0.1 to 10 μm. . In addition, when dispersing the above-mentioned mat agent in the resin mixture of the water-soluble resin and the water-resistant resin, the amount of the mat agent should be 20 to 40% by weight based on 100% by weight of the resin mixture, but the writing ability for pencil and drawing ink is improved. In order to control the hydrophilic ink, SiO ₂ having good writing characteristics is preferably used. In order to control the whiteness of the processed matt film, TiO ₂ may be mixed and used.

On the other hand, in the present invention, the support film corresponding to the main body on which the mat layer and the adhesive layer are formed may be a synthetic resin, for example, a polyethylene terephthalate film, which is conventionally used, and a method of applying the mat layer and the adhesive layer to the support film. In general, well-known gravure method or reverse method, or air knife method or BAR coating method may be used.

After forming the adhesive layer and the mat layer on the support film in this way, it is dried at a temperature of 130 ° C. to 170 ° C. for about 2 to 5 minutes and preferably for 3 minutes to complete the drawing mat film according to the present invention. .

When manufacturing the draft mat film according to the present invention by controlling the butylation degree and polymerization degree of the PVB resin used as the adhesive layer, the adhesion between the support film and the mat layer is excellent at the same time, especially the hydroxyl group and the mat remaining in the PVB resin Since the hydrophilic resin in the layer is molecularly bonded to each other, even if you use a pencil with high hardness or rub the mat film with an eraser slightly, there is no fear that the mat layer is peeled from the supporting film. In addition, by using a hydrophilic resin, not only the remarkability of the pencil and the water-based ink for drafting is remarkably improved, but also the water-resistant resin is added thereto, thereby preventing the blocking phenomenon even in a high temperature and high humidity atmosphere.

Hereinafter, examples of the present invention will be described.

Example 1

On the polyethylene terephthalate film having a thickness of 50 μm, an adhesive layer formed as follows was formed, but applied in a gravure manner so that the coating amount after drying was 2 g / m ² and dried at a temperature of 150 ° C. for 3 minutes.

10% by weight of polyvinyl butyl aldehyde (brand name: s lek BL-S, product of the Japan Tumimizu company)

Toluene / ethanol (1/1) ........................................ ................. 90 wt%

Applying the mat composition formed as follows on the adhesive layer formed in this way, and after drying it is applied in a gravure method so that the coating amount is 2.5g / m ² , and dried for 3 minutes at a temperature of 150 ℃ to prepare a mating film for drawing. .

Polyvinyl Alcohol (Japan, Oku Chemical, PVA-205) %

Melamine Resin (Japan, Samjeong Power, URAMIN P-6100) ................................. 5% by weight

SiO ₂ (Japan, FUJI-DAVISON, Syloid-65) .................................. .... 20 wt%

TiO ₂ (Canada, NL. Chem. Co. KRONOS CL220) ... 5% by weight

H ₂ O... … … … … … … … … … … … … Dilute the solids of the ingredients to 10%

Example 2

An adhesive layer is formed in the same manner as in Example 1, and a mat composition prepared as follows is coated thereon to prepare a mating film for drawing.

Polyvinyl Alcohol (PVA-105) ..................... 75 wt%

Urea Resin ... ....................................... 5 wt%

SiO ₂ (Syloid-66) ........................................ 20 wt%

H ₂ O ........................................................ Dilute to 10%

Comparative Example 1

On the polyethylene terephthalate film having a thickness of 50μm was applied to the following composition to prepare a drafting mat film.

gelatin… … … … … … … … … … … … … … … … … … … … … … … … … … … 87% by weight

SiO ₂ (Syloid-65)... … … … … … … … … … … … … … … … … … … … … … … 8.7% by weight

Waste play… … … … … … … … … … … … … … … … … … … … … … … … … … … … 4.3 wt%

H ₂ O... … … … … … … … … … … … … Dilute the solids of the ingredients to 10%

Comparative Example 2

On the polyethylene terephthalate film having a thickness of 50μm was applied to the following composition to prepare a drafting mat film.

Polyvinylidene chloride … … … … … … … … … … … … … … … … … … 20 wt%

SiO ₂ (Syloid-65)... … … … … … … … … … … … … … … … … … … … … … … 6% by weight

Chlorohexane… … … … … … … … … … … … … … … … … … … … … … … … … 34% by weight

Methyl ethyl ketone … … … … … … … … … … … … … … … … … … … … … … … 40 wt%

Comparative tests on adhesive strength, handwriting, blocking, and the like of the mat films prepared according to the above Examples and Comparative Examples were performed, and the results are shown in Table 1 below. At this time, the adhesive strength is a test of the adhesive strength between the mat layer and the support film by using a cellophane tape, the handwriting is a handwriting by CAD of Houston Instrument Co., Ltd. and then visually discriminated. The blocking phenomenon is according to JIS K-6842. Tested according to.

TABLE 1

As can be seen in Table 1, the mat film prepared according to the method of the present invention is superior to the support film and the mat layer compared to the mat film prepared according to the comparative example, for a pencil or a water-based ink for drawing It can be seen that not only the writing ability is good but also no blocking phenomenon occurs under high temperature and high humidity conditions.

Claims (4)

In preparing a mat film for drawing by applying a mat composition to a support film, polyvinyl dalbutyral represented by the following general formula (I) having a polymerization degree of 200 to 700 and a butylation degree of 50 to 70 mol% on the support film. After the resin is applied and dried, a mat composition is applied on the mat composition by dispersing 20 to 40 wt% of the mat agent based on 100 wt% of the mixture of the water-soluble resin and the water-resistant resin, and applying the mat composition. Method for producing a draft mat film, characterized in that the drying for about 2 to 5 minutes at a temperature of 130 to 170 ℃.

In the above equation, 1: m: n is 6 to 7: 1: 1 to 2-3. The method according to claim 1, wherein the mixture of the water-soluble resin and the water-resistant resin is mixed so that the amount of the water-soluble resin is 7 to 15 times with respect to the water-resistant resin. The method according to claim 2, wherein the mixture is a mixture of a water-soluble resin selected from polyvinyl alcohol, starch, carboxymethyl cellulose, methyl cellulose or sodium alginate and a water-resistant resin selected from melamine resin or urea resin. The method of claim 1, wherein the mat agent is characterized in that the inorganic particles of the particle size selected from SiO ₂ , TiO ₂ , A1 ₂ O ₃ or kaolin of 0.1 to 10μm.