JPS6059145B2 - drafting film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drafting film that has excellent writing properties for water-based writing instruments.

Conventionally, polyester films are generally used as drafting films, and in order to improve the writing characteristics of the polyester films, the surface of the polyester film is usually subjected to sandplast treatment or etching treatment, or the polyester resin is coated with inorganic pigments. The so-called polyester film surface is matted by kneading the filler and then forming it into a film, or by providing a matte layer containing a matting agent such as glass powder, alumina powder, silica powder, or talc powder on the surface of the polyester film. .
However, although these polyester films have good writing properties for pencils and oil-based writing instruments, they have poor water-based writing properties, such as thick ink lines, ink smearing, and splatter, and problems with ink absorption. Due to its poor properties and slow drying time, there was a defect in that when the ink image was rubbed with one's hand, the area around the ink image became contaminated.

In order to eliminate the defects of the conventional drawing film, the present inventors have conducted various studies and as a result, by coating the surface of the plastic film with a protein-based polymer substance, the surface of the plastic film can be coated with IL1''11d-^fr. The present invention was developed based on the discovery that ink bleeding does not occur even when forming lines using the same technique.

That is, the present invention is a drafting film characterized in that a coating layer is provided on the surface of a plastic film using a coating material consisting of a protein-based polymer compound and a hardening agent. Plastic films used in the present invention include polyester,
These include polycarbonate, polyvinyl chloride, cellulose triacetate, polyolefin, etc., and polyester film is particularly preferred in consideration of dimensional stability and the like.

Further, the thickness of the film can generally range from about 30μ to about 300μ. Also, polyester films particularly suitable for use as drafting films of the present invention are polyester matte films rather than clear films.

The thickness of the film usually ranges from 30μ to 300μ. Examples of the protein-based polymer compound that is a component of the coating material of the present invention include gelatin, fiproin, casein, keratin, albumin, and globulin.

Examples of hardening agents include formaldehyde, acetaldehyde, glyoxal, epoxy compounds, halogen carboxaldehydes, chromium alum, and potassium bright bread. This hardening agent is added in an amount of 0.1 to 3% by weight based on the protein-based polymer compound.

In the present invention, when using a matte film coated with a matting agent, for example, the matting agent (glass powder,
Aqueous or non-aqueous coating material in which fine powder such as silica powder, clay powder, titanium oxide, and alumina powder with an average particle size of 1 to 50μ is dispersed in a synthetic resin has a coating layer of 5 after drying. Use a coating that has been applied to a thickness of about 10 μm and dried.

In addition, in the present invention, in order to adjust the coating material to be applied on the matte film or clear film, 2 to 3% by weight of the protein-based polymer compound and 0.1 to 4% by weight of the hardening agent are added.
A solution or dispersion of 66 to 97.9% by weight of water is used.

The coating material has a coating layer of 0.5 to 1.5μ after drying on the base film (matte film without clear film).
Apply the coating material using a gravure roll coater etc. so that The drafting film of the present invention is coated with a coating material consisting of a protein-based polymer compound and a hardening agent.
Even if you record lines with water-based ballpoint pens, water-based stamps, inks, etc., there will be no smudging, and since the ink has a moderate amount of absorbency, the ink dries quickly and cannot be rubbed off.

Therefore, the drafting film of the present invention is suitable for automatic drafting films used in high-speed automatic drafting machines. Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 A force tin 1 was applied to the surface of a polyester base film (75μ thick) on which a matte layer (5 to 10μ thick) had been provided in advance.
A coating material consisting of 0 parts by weight, 0.5 parts by weight of formalin, and 89.5 parts by weight of water was coated with a gravure roll coater at a coating speed of 20 TrI. 1mi
The coating was applied at a temperature of n and curing ζ was performed at 100° C. for 1 minute.

When drawing lines are recorded using water-based ink on the drawing film obtained in this way, the ink absorbs very well and the ink dries quickly, resulting in clear drawings that do not smear or be rubbed off. It was done. Example 2 8 parts by weight of gelatin, 0.4 parts by weight of glyoxal and 91.9 parts by weight of water were added to the surface of a polyester base film (thickness 75 μm) on which a matte layer had been previously provided. The coating material consisting of the weight part was applied with a gravure roll coater at a coating speed of 20Tr1,1" so that the film thickness after drying was 1μ, and
Curing was performed for 1 minute in (2018).

When the drawing film obtained in this way is recorded with water-based drawing ink, the ink absorbs very well and the ink dries quickly, so the ink does not smudge or rub off and is clear. A detailed drawing was obtained. Example 3 A coating material consisting of 1 part of albumin and 9 parts of water was applied to the surface of a polyester base film (thickness: 75 μm) on which a matte layer had been previously provided using a gravure roll coater so that the film thickness after drying was 1 μm. Coating was carried out at a coating speed of 207 nm for 1 minute, and curing was performed at 1000C for 1 minute.

When the drawing film obtained in this way is recorded with water-based drawing ink, the ink absorbs very well and the ink dries quickly, so the ink does not smear or rub off and is clear. A detailed drawing was obtained. Example 4 The surface of a polycarbonate film (thickness: 75 μm) was coated with 1 part by weight of tin, 0.5 parts by weight of formalin, and 89 parts by weight of water.
The coating material consisting of 5 parts by weight was coated with a gravure roll coater at a coating speed of 20TrL so that the film thickness after drying was 1μ.
It was coated with Imin and cured at 100° C. for 1 minute.

Claims (1)

[Claims] 1. A drafting film characterized in that a coating layer is provided on the surface of a plastic film using a coating material consisting of a protein-based polymer compound and a hardening agent.