JPH01141041A - Easily adhesive sheet for notice board - Google Patents

Abstract

PURPOSE:To ensure the recovery of a shape after folding and to enable sufficient durability to be held even under humid condition, by laminating a fire retardant PVC foamed layer, a barrier layer, and a binder layer fixing a fine globular adhesive, successively. CONSTITUTION:A sheet consists of a fabric base layer 1, a fire retardant PVC foamed layer 2, two barrier layers 3, 4, and a binder layer 6 fixing fine globular adhesive 5. The fabric layer 1 made of a knitted fabric, a woven fabric, or an unwoven fabric has sufficient durability under humid condition. The fire retardant PVC foamed layer 2 formed on the layer 1 contains 40-100 parts of a plasticizer and 0-20 parts of a flame retarder adjustant per 100 parts (pts.wt.) of a vinyl chloride resin, imparts flexibility to the whole sheet, and forms a sheet substrate with the fabric base layer 1. The barrier layers 3, 4, for example, made of a polyurethane resin and a polyamide resin prevent the migration of a plasticizer for softening a PVC in the PVC foamed layer 2. The globular adhesive 5 and the binder layer 6, which are laminated on the barrier layer 4, can be made of a general material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a light adhesive bulletin board sheet, and more particularly to a light adhesive bulletin board sheet that has a soft touch and retains sufficient functionality even under wet conditions.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION Light-adhesive bulletin boards are capable of attaching paper and film-like objects such as documents, photographs, and drawings with moderate adhesive strength and retaining them for a certain period of time. Paper-pulling paper etc. (The demand for it is increasing in various fields. By the way,
As shown in FIG. 2 of the accompanying drawings, currently known sheets for such bulletin boards are made of cardboard 11 or the like as a base material, on which is formed a binder layer 13 on which fine spherical adhesive 12 is fixed. It is something. Although this known sheet has a very simple structure and poses no particular problem in terms of application, retention, and peeling for the intended purpose, it has a very hard surface and is difficult to touch under wet conditions. When left unused, the paper base is often torn and stains such as stains occur. Moreover, when it is bent, it takes on a shape and cannot be used as a product.

Therefore, it has become desirable to develop a light adhesive bulletin board sheet that is soft to the touch and maintains its functionality even under wet conditions. Furthermore, it is necessary for safety to make the sheet flame retardant.

In order to provide a sheet that satisfies these demands, the inventors of the present invention conducted extensive research and found that a flame-retardant PvC foam layer was provided on the base fabric layer to increase the flexibility of the entire sheet.
Then, by providing a barrier 11'1 to prevent the plasticizer in the PVC foam layer from migrating to the surface, and laminating a binder layer on which a fine spherical adhesive is fixed, the desired sheet can be obtained. They discovered this and completed the present invention.

Structure and Effects of the Invention Namely, the present invention provides a light adhesive bulletin board characterized in that a flame retardant PVC foam layer, a barrier layer, and a binder layer to which a fine spherical adhesive is fixed are sequentially laminated on a base fabric layer. It provides sheets.

Hereinafter, the light adhesive bulletin board sheet of the present invention will be specifically explained based on the accompanying drawings.

The sheet of the present invention shown in FIG. 1 includes a base fabric layer 1, flame-retardant PVC;
The foam layer 2 consists of two barrier layers 3, 4 and a binder layer 6 on which a microspherical adhesive 5 is fixed. The base fabric layer 1 is for preventing expansion and contraction of the entire sheet, and is made of knitted fabric, woven fabric, nonwoven fabric, etc., and has sufficient durability under humid conditions. In addition, the flame-retardant PVC foam layer 2 formed on the layer 1 contains 100 parts (parts by weight, the same applies hereinafter) of vinyl chloride resin (straight and copolymer resin with a degree of polymerization p=soo~2000). 40 to 100 parts of a plasticizer, for example, a phosphoric acid ester type (0 to 30 parts) as a flame retardant imparting plasticizer, and a polyester type (molecular ff 180) as a plasticizer with low migration properties.
0 or more) or mixed with or alone with trilimellitic acid type, phthalic acid type (things with large molecular weight, such as DUP, DIDP%DINP, DNP, etc.), flame retardant auxiliary agent 0
~20 parts, for example, a foam layer (thickness 0.2 to 1.2
in), imparts flexibility to the entire sheet, and constitutes the sheet base material together with the base fabric layer 1.

A blending example of foam layer 2 is shown below.

PVC resin (manufactured by Kanebuchi Chemical Industry ■, Kanevinyl Paste P
SH-20, P=1300)---100 parts TCP (tricresyl phosphate)-1-20 parts TOTN [
tri(2-ethylhexyl) trimellitate)
-1-40 parts antimony dioxide
-1-5 parts blowing agent -m
-3 parts foaming aid ---1,5 parts stabilizer -1-5 parts filler
-1-20 parts The barrier layer 3.4 is:
For example, it is made of polyurethane resin (layer 3 in the figure) or polyamide resin (layer 4 in the figure), and prevents migration of the plasticizer for softening the PVC in the PVC foam layer 2.

When the plasticizer migrates to the binder layer 6 on the surface, it damages the analgesic 6 and the microspherical adhesive 5, causing them to become softened and inactivated, and the apparent adhesion strength increases or decreases, resulting in the phenomenon of so-called "paper sticking" or decreased adhesive strength. wake up

In the illustration, two barrier layers 3.4 are provided;
One or two or more barrier layers may be used, typically with a total thickness ranging from 0.01 to 0.1+rm.

The microspherical adhesive 5 and binder layer 6 laminated on the barrier layer 4 may be composed of ordinary materials. Manufactured by Olivine B
PW4960), and as the binder layer 6, polyacrylic acid resin (for example, Tienaru LR-170 manufactured by Mitsubishi Rayon ■) can be used. Adhesive i￥
IJ5 adheres to adherends by point adhesion and has high cohesive strength, so there is no paper tearing. Note that in order to improve the adhesiveness between the barrier layer and the binder layer 6, a separate adhesive layer (not shown) may be provided.

The sheet of the present invention, which has the above structure, has a soft touch because the entire sheet is flexible, and does not retain its shape even when bent, and the base material has considerable strength, so it It maintains sufficient durability under various conditions, and is also advantageous in terms of safety because it is flame retardant. As shown in the figure, in order to protect the adhesive surface, a releasable plastic film (for example, a polyethylene film with a thickness of about 50 μm) 7 is preferably attached.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the sheet of the present invention, and a second
The figure is a sectional view showing an example of a conventional sheet, which includes a base fabric layer, 2: a flame-retardant PVC foam layer, 3 and 4: barrier layers, 5: microspherical adhesive I, and 6: a binder layer. Patent applicant: Sunstar Giken Co., Ltd. Representative Patent attorney: Seihaku Bo and 1 other person Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A light adhesive bulletin board sheet, characterized in that a flame-retardant PVC foam layer, a barrier layer, and a binder layer fixed with a microspherical adhesive are sequentially laminated on a base fabric layer.