JPH0727174Y2 - Seat for overhead projector - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an OHP sheet used for an overhead projector (hereinafter abbreviated as OHP) that projects characters and figures on a screen.

<Prior Art> In recent years, OHP has been actively used in conferences and lectures. A conventional OHP sheet is used for OHP by forming an image on a transparent support by handwriting, copying by a copying machine, thermal transfer recording by a word processor or the like, ink jet recording or the like.

However, there is a recent demand for diversification of uses for OHP sheets.For example, after forming an image on an OHP sheet and using it at a conference, etc., it can be saved as a document, or the image information on the OHP sheet can be copied. Is often used for other purposes. However, conventional OHP
Since transparency is required for the sheet for printing, a transparent plastic film is usually used, so it is transparent and difficult to read when viewing it as a document, so it is inconvenient to divert the OHP sheet once imaged to another application. Met. In addition, when the image is formed on the OHP sheet, it is a plastic film, so that the fixing of the image is poor, and when the image portion is rubbed, there is a problem that it becomes dirty or the image is removed and disappears.

<Problems to be Solved by the Invention> In view of the above circumstances, the present invention has excellent image forming characteristics, and is a document after copying an OHP sheet on which an image is formed or after using it as an OHP sheet. The present invention provides an OHP sheet which is easy to handle when it is stored as.

<Means for Solving the Problems> In the present invention, an image forming layer is provided on one surface of a transparent support, and an opaque support is laminated on the other surface of the transparent support via a removable adhesive layer. It is a sheet for overhead projectors.

The transparent support used in the present invention includes polyester, polyethylene, polypropylene, polyvinyl chloride,
Examples thereof include transparent films such as cellulose triacetate, but the present invention is not limited to these, and any sheet-like material having transparency and strength and flexibility that does not hinder practical use can be used.

The image forming layer is provided on one surface of the transparent support, and when directly recorded on the transparent support by various recording methods such as a copying machine, thermal transfer and ink jet, the fixability of the recorded image is sufficient. It is provided in order to eliminate the drawback that it is not obtained, and if it is rubbed, it becomes dirty and the image comes off, and it has the function of fixing and holding the image. The image forming layer, for example, various resins such as urethane resins, silicone resins, polyester resins, vinyl chloride-vinyl acetate resins and the like, silica, clay, talc, kaolin, calcium carbonate, within a range that does not impair transparency.
An air knife coating method, roll coating method, wire bar coating method, spray coating of a coating solution in which pigments such as aluminum silicate, aluminum oxide and zinc oxide are dispersed or dissolved in a solvent such as water, alcohol, toluene, methyl ethyl ketone and cyclohexane. Method, a fountain coating method, or the like, is applied and dried on a transparent support.

The releasable pressure-sensitive adhesive layer has pressure-sensitive adhesiveness and removability with respect to the stacking facing surface. Such properties can be obtained by using a re-peelable pressure-sensitive adhesive which is used for applications such as a re-peelable pressure-sensitive adhesive label, a masking tape, an office temporary fitting tape and the like. Among such pressure-sensitive adhesives, for example, acrylic polymers, acrylic copolymers, emulsion type adhesives such as natural rubber, and room temperature curable silicone rubber can be preferably used. The removable pressure-sensitive adhesive layer is prepared by using the pressure-sensitive adhesive as described above in a suitable solvent (water, methanol,
A transparent support and / or opaque coating solution prepared by dispersing or dissolving it in ethanol, toluene, methyl ethyl ketone, ethyl acetate, etc.) using a coating machine such as an air knife coater, roll coater, wire bar coater, spray coater or fountain coater. It can be provided by coating on one surface of the support and drying. In addition,
The coating amount is preferably ² to 30 g / m ² . As described above, the removable pressure-sensitive adhesive layer is provided on at least one of the transparent support and the opaque support, and it may be appropriately selected depending on the use as an OHP sheet.

The opaque support in the present invention is not particularly limited in terms of material and color tone as long as it is a sheet, and may be colorless and transparent. For example, various types of paper such as writing paper, printing paper, wrapping paper, thin paper, polyethylene, polypropylene and the like, which are mixed with filler as necessary, laminated, coated, synthetic paper, polyethylene,
Various white plastic films such as polypropylene and polyethylene terephthalate, mixed paper, non-woven fabric, various cloths,
Examples include leather. It is preferable that the opaque support is a white type in consideration of visual observation of the image and reading of the image in a copying machine, and in particular, the reflectance (JIS K-7105
5.5) is preferably 50% or more.

As described above, in the OHP sheet of the present invention, the image forming layer 2 is provided on one surface of the transparent support 1 as shown in FIG. 1, and the opaque support 4 is laminated via the removable adhesive layer 3. It has a configured configuration. Here, the removable pressure sensitive adhesive layer 3 may be located between the transparent support 1 and the opaque support 4, and therefore, in the manufacturing process, after the removable pressure sensitive adhesive layer is provided on one side of the transparent support 1, the opaque support is provided. The body 4 may be adhered, or conversely, the transparent support 1 may be adhered after the removable adhesive layer is provided on one surface of the opaque support 4.

The OHP sheet of the present invention has the above-mentioned structure, and after forming a desired image on the image forming layer by a copying machine, a printer, etc., the opaque support is peeled and removed, and only the transparent support side is OHP. Can be used for. Further, after use in OHP, it can be again attached to an opaque support and stored, and such peeling adhesion can be repeated as necessary.

Since the OHP sheet of the present invention is used for image formation by a copying machine or the like and for using OHP by peeling off the opaque support, it may be subjected to antistatic treatment. preferable. To perform antistatic treatment, in a transparent support or an opaque support, at least one of the two supports may contain an antistatic agent, or the surface of the transparent support or opaque support may be charged. This is done by coating an antistatic agent, and in the image forming layer or the releasable pressure-sensitive adhesive layer, by blending an antistatic agent in each layer forming coating liquid. Examples of the antistatic agent include phosphoric acid ester-based and fatty acid ester-based antistatic agents, and various cationic, anionic, and nonionic antistatic agents can be appropriately selected and used.

Further, in the OHP sheet of the present invention, the surface of the image forming layer can be easily identified when forming an image, for example,
Marks such as symbols, letters, and figures can be printed on the OHP sheet image forming layer, transparent support, removable adhesive layer, part of the opaque support without affecting the image, or by OHP.
It is practically effective to provide a part of the working sheet with a mark such as a notch so as to distinguish between the image forming surface and the opaque support surface which is the opposite surface.

<Embodiment> Next, the present invention will be described with reference to an embodiment. In addition, all the parts showing the composition represent parts by weight.

Example 1 A heat-treated polyester film (PT-100G, manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 100 μm was used as a transparent support, and a coating solution having the following composition was applied to one surface of the polyester film and dried to obtain a layer thickness. A 2 μm image forming layer was provided.

Next, on the other surface of the transparent support, an acrylic copolymer pressure-sensitive adhesive (AB-417, manufactured by Showa High Polymer Co., Ltd.) was applied and dried to form a re-peelable pressure-sensitive adhesive layer having a coating amount of 8 g / m ^2. Provided. A 125 μm thick white film (U2-125 manufactured by Teijin Ltd.) is attached as an opaque support to the surface of the removable adhesive layer, and the OHP of the present invention is attached.
A sheet was prepared.

Example 2 The coating step of the removable pressure-sensitive adhesive layer in Example 1 was changed,
An OHP sheet of the present invention was produced in exactly the same manner except that the removable pressure-sensitive adhesive layer was first provided on the opaque support side and then the transparent support was bonded to the other surface.

Example 3 Instead of the acrylic copolymer adhesive in Example 2, silicone rubber (Silbot 30 manufactured by Dow Corning) was used.
The OHP sheet of the present invention was produced in exactly the same manner except that 0A & B) was used.

Example 4 An antistatic layer having a coating amount of 2 g / m ² by coating and drying an antistatic agent (SAT-5, manufactured by Nippon Pure Chemical Co., Ltd., solid content 1%) on one surface as an opaque support in Example 1. Of the present invention except that the other surface of the opaque support is bonded to the surface of the removable pressure-sensitive adhesive layer of the transparent support by using
A sheet for OHP was produced.

After cutting the OHP sheets obtained in Examples 1 to 4 to A4 size, a toner image was formed on the image forming layer surface of the OHP sheet using a commercially available electrophotographic copying machine. A good image having abrasion resistance that can withstand even was obtained. When the opaque support of these OHP sheets was peeled off and the transparent support on which the image was formed was put on a commercially available OHP, a good image was obtained on the screen. this
When the sheet used for OHP was attached to the opaque support once removed, an OHP sheet as an easy-to-read document similar to general documents was obtained. Further, when this OHP sheet was copied using a commercially available electrophotographic copying machine, a good copy without fog was obtained at the same level as a copy of a general document.

<Effect of the Invention> The OHP sheet of the present invention is used for OHP because it has a structure in which an opaque support is laminated on a transparent support provided with an image forming layer via a removable adhesive layer, and integrated. Sometimes it is integrated with a removable adhesive layer, so the opaque support can be easily removed and only the transparent support part can be used as an OHP sheet, and after use with OHP, it is re-attached to the opaque support. It has an excellent effect that it can be made into a very easy-to-read stored document by integrating them.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of the OHP sheet of the present invention. 1 ... Transparent support, 2 ... Image forming layer, 3 ... Removable adhesive layer, 4 ... Opaque support.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-178291 (JP, A) JP-A-57-107880 (JP, A) JP-A-57-14091 (JP, A) Actual development Sho-57- 81177 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An image forming layer is provided on one surface of a transparent support, and an opaque support is laminated on the other surface of the transparent support via a removable adhesive layer. Seat for overhead projector.