JP2000272273A - Mat film for drawing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a fouling due to a rubbing of lead pencil lines by laminating a mat layer formed of a mat agent comprising a polyol resin of a specified composition, an isocyanate prepolymer and a synthetic resin particle at least on one surface of a mat film for drawing. SOLUTION: This mat film for drawing is formed by laminating a mat layer comprising a polyol resin, an isocyanate prepolymer, and a mat agent on one surface of a plastic film. In this case, the polyol resin to be used is prepared of a resin of which the major components are two components of an acryl polyol resin and a polyurethane polyol resin. Then, a composition wherein the two component based polyol resin and the mat agent of a synthetic resin particle are combined, is crosslinked and solidified by the isocyanate prepolymer, and the mat layer is formed. By this constitution, a fouling of lead pincil lines is reduced, and at the same time, a difference is conspicuously expressed in the density of respective drawn lines by lead pencils of different hardnesses.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing mat film, and more particularly to a drawing mat film excellent in pencil writing performance when a drawing is prepared by a manual operation on a drafting desk.

[0002]

2. Description of the Related Art Recently, drafting matte films have been used in mechanical and non-artificial working environments such as drawing by a high-speed multi-pen plotter using a signal input from a CPU. There is still a great deal of artificial work on the desk by designers, surveyors and other drafters. In such an artificial drafting operation, drawing with a pencil is an operation that is performed on a regular basis, like the aqueous and oil-based ink pens.

[0003] Lines drawn by a pencil on a drafting mat film are rubbed by workers' hands, arms, worn clothes, etc. in drafting work performed by humans, and drawing is performed. Dirt and darkening will be left on areas that are not covered. A matte film for drafting with dirt and darkening is not only bad in appearance,
In the next step, the original of the second original such as PPC or diazo copy may be obtained. At this time, the unpainted portion on the drafting mat film is stained with the second original.
This will adversely affect the original drawing, such as soiling. In view of the above, a matte film for drafting, which is less contaminated by rubbing of a pencil drawing or the like, is desired.

On the other hand, for pencils used in a matting film for drafting, pencil cores (including mechanical pencil cores) having hardnesses of 6B to 8H are used.

When a drawing creator such as a architect or surveyor draws a drawing, a dotted line, a dashed line, a colored pencil, etc. are used to distinguish lines inside and outside a building or a structure, drawing lines such as a near view and a distant view, and characters. In addition to the use, the discrimination is also made based on the density of the drawing line. The density of the drawing line is determined depending on the hardness of the pencil.

When a drafting matte film is used as a manuscript for the second original drawing of diazo copy, the drafting creator gives intention to each density of each drawing, despite the intention of each drawing. If the density difference is small, the intention of each image line on the drawing does not appear in the second original drawing by diazo copy. Conversely, if the density difference between each object is large, the intention of each object is
Appears in the 2nd original drawing of diazo copy. Under such circumstances, there is a demand for a drawing mat film in which when drawing with a pencil on the drawing mat film, an effective difference appears in the image density of each drawing line depending on the pencil hardness.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and reduces contamination due to rubbing of a pencil drawing and draws with each pencil hardness when drawing with a pencil. It is an object of the present invention to obtain a matting film for drafting in which an effective difference is found in the image density of each image.

[0008]

Means for Solving the Problems As a matting film for drafting of the present invention for solving the above-mentioned objects, at least one surface of a plastic film is provided with at least a polyol resin,
A matting film for drafting in which a mat layer composed of an isocyanate prepolymer and a matting agent is laminated, wherein the polyol resin is mainly composed of two components of an acrylic polyol resin and a polyurethane polyol resin, and the matting agent Are synthetic resin particles.

The drawing mat film of the present invention is
A mixture of two or more kinds of synthetic resin particles having different particle diameters is used as the matting agent.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The matting film for drawing according to the present invention includes:
At least one surface of a plastic film is laminated with a mat layer composed of at least a polyol resin, an isocyanate prepolymer, and a matting agent.

The plastic film used in the present invention includes polyester film, polycarbonate film, acrylic resin film, vinyl chloride resin film,
Various types such as polypropylene film, polyethylene film, polyamide film, nylon film, polyethylene naphthalate film and triacetyl cellulose film can be used, but when used for the 2nd original drawing etc., dimensional stability and transparency are required Therefore, a polyester film is particularly preferable.

The thickness of these plastic films varies slightly depending on the purpose of use, but generally ranges from 25 to 200.
About μm is appropriate.

The mat layer to be laminated on the plastic film is formed by coating a composition comprising at least a polyol resin, an isocyanate prepolymer and a matting agent with a matting layer coating solution obtained by appropriately adding a diluting solvent and additives. It is formed by this.

[0015] The polyol resin used here is mainly composed of two components, an acrylic polyol resin and a polyurethane polyol resin.

Accordingly, the present invention provides a matte layer formed by crosslinking and curing a composition obtained by combining the two-component polyol resin and a matting agent of synthetic resin particles with an isocyanate prepolymer, whereby the pencil image is rubbed. The contamination can be reduced, and an effective difference can be found between the densities of the image lines drawn by the respective pencil hardnesses, so that excellent pencil writing properties can be obtained.

Such an acrylic polyol resin is a copolymer of a hydroxyl group-containing compound and another polymerizable compound, and becomes a polyurethane resin by crosslinking and curing with an isocyanate prepolymer, and has a hydroxyl value of 15 to 15.
It is preferably 55, more preferably 25 to 45.

Examples of the hydroxyl group-containing compound constituting such an acrylic polyol resin include hydroxy (meth) acrylate and N-hydroxyalkyl (meth) acryl alkyd, and other polymerizable compounds include
Unsaturated acids such as (meth) acrylic acid, itaconic acid, maleic acid, crotonic acid and anhydrides thereof, esters of acryl or methacrylic acid, styrene derivatives, organic nitrile acids, organic vinyl esters and the like.

The other polyurethane polyol resin is a copolymer in which a hydroxyl group-containing compound is cross-linked and cured by an isocyanate prepolymer to have a urethane bond in a main chain and a hydroxyl group at a terminal, and further comprises an isocyanate prepolymer. A polyurethane resin is obtained by crosslinking and curing with a resin having a hydroxyl value of 15 to 55, more preferably 25 to 45.

Examples of the hydroxyl group-containing compound constituting such a polyurethane polyol resin include ethylene glycol, diethylene glycol, triethylene glycol, butylene glycol, 1,3-butanediol, and the like.
1,4-butanediol, neopentyl glycol,
Examples include low molecular weight diols and triols such as 1,6-hexanediol, glycerin, trimethylolpropane, and hexanetriol.

The mixing ratio of the acrylic polyol resin and the polyurethane polyol resin is adjusted so that the equivalent ratio of the hydroxyl group of the acrylic polyol resin to the hydroxyl group of the polyurethane polyol resin is 2: 8 to 8: 2, preferably 3: 2. 7 to 7: 3 is desirable. By making the acrylic polyol resin more than 2: 8, the solvent resistance and quick drying property of the coating film can be increased, and by making the polyurethane polyol resin more than 8: 2, the flexibility of the coating film can be increased. Can be obtained, and the stain resistance due to the rubbing of the pencil drawing can be improved.

In addition to these acrylic polyol resins and polyurethane polyol resins, a total of 10
0 parts by weight, if it is in the range of 25 parts by weight or less, thermosetting resin such as other polyol resin, cellulose derivative, vinyl resin, acetal resin, polystyrene resin,
It is also possible to add a thermoplastic resin such as a polyamide resin.

Examples of the isocyanate prepolymer for crosslinking and curing these acrylic polyol resins and polyurethane polyol resins include xylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPD).
I) and aliphatic, alicyclic, and araliphatic isocyanate prepolymers such as tetramethylxylylene diisocyanate. XDI and HDI are particularly preferably used in combination. By using these XDI and HDI together, the solvent resistance, quick drying property and pencil writing property of the coating film can be further improved.

The mixing ratio of the isocyanate prepolymer and the polyol resin is equivalent ratio (NCO / OH).
0.5 to 1.5, preferably 0.7 to 1.3 is adopted.

The matting agent used in the present invention is preferably synthetic resin particles such as polymethyl methacrylate, polystyrene, polyurethane, benzoguanamine, silicone, etc., and particularly those having a true spherical shape are preferably used. In this way, the matte agent of the synthetic resin particles is added to the polyurethane resin coating film obtained by crosslinking and curing the acrylic polyol resin and the polyurethane polyol resin with the isocyanate prepolymer, and the matte layer is formed. Contamination can be reduced, and an effective difference can be seen in each image density drawn by each pencil hardness, and excellent pencil writing performance can be obtained.

Here, in order to further improve the pencil writing property, it is effective to make the particle size distribution of the synthetic resin particles mixed in the coating film into a particle size distribution having peaks at two or more particle sizes. is there. Such a particle size distribution having a peak at two or more types of particle sizes is preferably such that the number of particles other than the peak particle size is as small as possible. It is preferable that the distribution is made. Therefore, in order to obtain such a particle size distribution, it is carried out by mixing and using two or more kinds of synthetic resin particles having different particle sizes with synthetic resin particles having a very uniform particle size distribution. It is possible.

The particle size of the synthetic resin particles is 0.5 to
10 μm, preferably 1 to 5 μm is employed. The amount of the synthetic resin particles to be added to the total of 100 parts by weight of the acrylic polyol resin and the polyurethane polyol resin is 5 to 150 parts by weight, preferably 10 to 100 parts by weight.

Further, inorganic particles can be added to the matting agent as long as the average primary particle size is smaller than the particle size used for the synthetic resin particles. Examples of such inorganic particles include alumina, amorphous silica, crystalline silica, titanium dioxide, talc, calcium carbonate, magnesium carbonate, barium sulfate, zirconium oxide, and the like. The amount of the inorganic particles to be added is preferably within a range of 60 parts by weight or less based on 100 parts by weight of the synthetic resin particles.

By adding the inorganic particles in this manner, the erasability and re-writability of an object written with a pencil can be improved, the gloss of the mat layer can be suppressed, and the blocking resistance can be improved. Will be able to

As described above, the mat layer is prepared by adding a dispersant, a leveling agent and other additives and a diluting solvent to the composition composed as described above to prepare a mat layer coating solution. It can be formed by applying a coating method.

Examples of such diluting solvents include ketones (eg, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone), esters (eg, methyl acetate, ethyl acetate, butyl acetate, glycol acetate, monoethyl acetate), aromatic hydrocarbons (eg, Those which do not contain a hydroxyl group such as benzene, toluene and xylene are preferred.

The thickness of the thus obtained mat layer is 3 to 15 μm, preferably 5 to 10 μm.

In the matting film for drawing according to the present invention, the matte layer may be subjected to a surface treatment in order to improve the adhesiveness between the water-based and oil-based ink pens and the ink.
It is also effective to provide an undercoat layer in order to improve the adhesion between the mat layer and the plastic film.

[0034]

Embodiments of the present invention will be described below.
Note that “parts” and “%” are based on weight unless otherwise specified.

Example 1 A 50 μm-thick polyethylene terephthalate film (Lumirror S14: Toray Industries, Inc.) was subjected to a corona discharge treatment on one surface, and then a mat layer coating solution a having the composition shown in Table 1 was applied to the corona discharge treatment surface. Then, by drying, a mat layer having a dry coating thickness of about 7 μm was formed, and a matting film for drafting of the present invention was produced.

Example 2 The procedure of Example 1 was repeated, except that the mat layer coating liquid a was changed to the mat layer coating liquid b having the composition shown in Table 1 to form the mat layer. A matting film for drafting of the present invention was produced.

[Comparative Examples 1 to 3] Example 1 was repeated except that the mat layer coating liquid a was changed to the mat layer coating liquids c to e having the compositions shown in Table 1 to form the mat layer. In the same manner as in the above, a matte film for drafting was produced.

In Table 1, polyol resin A is an acrylic polyol resin (Acridic A-814 (solid content 50%: hydroxyl value 17.5): Dainippon Ink and Chemicals, Inc.), and polyol resin B is a polyurethane polyol resin. (Takelac E-550 <50% solids: hydroxyl value 2
0>: Takeda Pharmaceutical Company Limited, isocyanate prepolymer C is xylene diisocyanate (Takenate D-110)
N (solid content 75%: NCO% 11.5>: Takeda Pharmaceutical Company Limited), isocyanate prepolymer D is hexamethylene diisocyanate (Bernock DN-955 <solid content 7
5%: NCO% 6.5>: Dainippon Ink and Chemicals, Inc.)
The matting agent E is made of silicone resin particles (Tospearl 130)
<Particle size 3 μm>: Toshiba Silicone Co., Ltd., matting agent F is silicone resin particles (Tospearl 120 <Particle size 2 μm>):
Toshiba Silicone Co., Ltd., matting agent G is crystalline silica (Crystalite FM-1 <average primary particle size 1.48 μm>):
Tatsumorisha), matting agent H is amorphous silica (Sylysia 35)
0 <average primary particle size 1.8 μm>: Fuji Silysia Chemical Ltd.), matting agent I was titanium dioxide (Typure R-70)
0 <average primary particle size 0.27 μm>: DuPont).

[0039]

[Table 1]

Table 1 shows the evaluation results of the matte film for drafting obtained as described above with respect to pencil writing property and diazo copy suitability. Each evaluation was performed as follows.

[Pencil Writability] Concentration: A line was drawn with a constant load using a pencil lead of HB, 2H, or 4H, and the density of the image was measured with a microdensitometer (no filter: Sakura Microdensi) for each pencil hardness. It was measured with a tomometer PDM-5). The difference between the HB concentration and the 4H concentration measured in this way was taken as the concentration difference. -Stain resistance: Draw a line with a constant load using a 2H pencil lead, rub the line with a constant load with a cotton cloth, and visually evaluate the degree of contamination of the undrawn portion. The good ones were marked with “○” and the bad ones were marked with “×”.

[Diazo copy suitability]
A manuscript was obtained by drawing a line with a constant load using a pencil lead of B, 2H, or 4H, and each image density difference in the second original drawing by each diazo copy was visually evaluated. ◎ ”, good ones“ ○ ”, bad ones“ × ”, and particularly bad ones“ xx ”.

[0043]

[Table 2]

As is clear from Table 2, the matte films for drafting of Examples 1 and 2 exhibited excellent results in both pencil writing properties and diazo copy suitability. In particular, in Example 2, since two types of silicone resin particles were mixed and used as the synthetic resin particles, a particularly excellent result was obtained in the density difference in pencil writing properties and diazo copy suitability.

On the other hand, the matting film for drafting of Comparative Example 1 used only the polyurethane polyol resin as the polyol resin, so that there was no problem with the stain resistance, but almost no difference could be obtained in the concentration difference. Almost no difference in density was obtained in diazo copy suitability. Since the drawing mat film of Comparative Example 2 used only the acrylic polyol resin as the polyol resin, and the matting film of the Comparative Example 3 did not use synthetic resin particles, the density difference and the stain resistance were low. , And diazo copy suitability were inferior.

[0046]

According to the drawing mat film of the present invention, a mat layer obtained by crosslinking and curing an acrylic polyol resin and a polyurethane polyol resin to which a matting agent of synthetic resin particles is added with an isocyanate prepolymer is provided on at least one surface of a plastic film. By laminating, it is possible to reduce contamination due to rubbing of pencil objects and obtain a matte film for drafting in which there is an effective difference in the density of each object drawn according to each pencil hardness.

Claims (2)

[Claims] 1. A matting film for drafting comprising a mat layer composed of at least a polyol resin, an isocyanate prepolymer, and a matting agent laminated on at least one surface of a plastic film, wherein the polyol resin is an acrylic polyol resin and a polyurethane polyol resin. Wherein the matting agent is a synthetic resin particle, and wherein the matting agent is a synthetic resin particle. 2. A matting film for drawing according to claim 1, wherein two or more kinds of synthetic resin particles having different particle diameters are mixed and used as said matting agent.