JPH0557118B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) This invention involves applying a pressure-sensitive adhesive that does not adhere under normal conditions to predetermined portions and surfaces of a continuous or single-piece printing sheet on which information is printed. Then, when using the printing sheet, for example, pressure-sensitive bonding is effective for use in various overlapping adhesives, such as for sealing printing sheets for envelopes, for binding printing sheets for binding after printing, etc. The present invention relates to a wearable print sheet.

(Prior art and its problems) Conventionally, pressure-sensitive adhesives have been used as adhesives for printing sheets, which do not adhere under normal conditions but are bonded by applying adhesive conditions for the adhesive. (Adhesion conditions 120-150Kg/
cm ² ), heat-sensitive adhesives (adhesive conditions around 120℃), and re-wetting adhesives are widely known, and heat-sensitive adhesives are particularly difficult to cause blocking for printing sheets. However, blocking occurs due to the temperature conditions, load, etc. during storage or transportation of sheets for printing forms that use heat-sensitive adhesives. Attempts have been made to improve the agent application pattern, but this has not yet completely prevented the blocking phenomenon.

Furthermore, in recent years, so-called non-impact printers have come into widespread use when printing information on various forms. When printing with an electronic printer that uses toner, which is a type of non-impact printer, the print is fixed using a heating method, which causes the adhesive applied to the printing sheet to soften. It had the disadvantage of easily causing various troubles.

Furthermore, since silicone oil is applied to the roll to prevent toner from transferring to the fixing roll in the printer, the silicone oil adheres to the surface of the adhesive, making normal adhesion impossible.

(Problem to be Solved) This invention eliminates the drawbacks of the conventional adhesive that does not adhere under normal conditions, and has excellent non-blocking properties, heat resistance, and abrasion resistance, and is suitable for various conditions of electronic printers. The present invention provides a pressure-sensitive adhesive printing sheet.

(Means for solving the problem) This is a printing sheet that is used by printing notification information and then adhering it with an adhesive that has been applied in advance. A pressure-sensitive adhesive is applied to the non-thermoplastic area, and this pressure-sensitive adhesive has oil-absorbing, non-thermoplastic fine particles with an average particle size of 1 to 20 μm dispersed therein. The conventional problems are solved by providing a printing sheet for pressure-sensitive adhesive, which is characterized in that the surface of the pressure-adhesive layer is formed with unevenness.

(Function) By adding oil-absorbing, non-thermoplastic fine particles with an average particle size of 1 to 20 μm to a pressure-sensitive adhesive that does not adhere under normal conditions, the surface of the adhesive layer becomes uneven due to the particles. Since it is formed,
When printing sheets are stacked and stored or transported, the surfaces of the sheets that are in contact with the surface of the adhesive or the surfaces of the adhesives do not come into close contact with each other due to the particles in the convex portions, resulting in good non-blocking properties. Also, when the printing sheet contacts the heating fixing drum of the printer during printing, the fine particles on the convex portion contact the fixing drum and feed the printing sheet, and the fine particles are heated. Since there is no plasticity, the fine particles are plasticized by heat and the adhesive does not come into direct contact with the heat-fixing drum, improving heat resistance and allowing smooth feed in the printer.

Furthermore, even when printing with a printer that uses silicone oil, the fine particles absorb the silicone oil, preventing it from adhering to the adhesive surface.
The adhesive properties of the adhesive can also be maintained well.

(Example) In this invention, the pressure sensitive adhesive applied to the printing sheet is an acrylic copolymer material, NBR,
Adhesives whose main ingredient is synthetic rubber such as SBR, preferably having an oil absorption of 75 ml/100 g or more, and non-thermoplastic fine particles with an average particle size of 20 μ (microns) or less are added. It is.

The fine particles that can be used have an average particle size of 1 to 1.
There are silica gel, activated clay, etc. that have a particle size of 20μ, and particles with a particle size of 1μ or less may have poor heat resistance and blocking resistance, and particles larger than 20μ may damage the printer, so the average particle size is Secondary crystalline silica gel fine particles with a diameter of 1 to 20 μm are suitable, and when fine particles of approximately 2 μm or less are used, they mainly perform the silicone oil absorption function.
In this case, 2μ, which has heat resistance and anti-blocking properties, is used.
When used together with the above-mentioned fine particles such as corn starch, the intended purpose can be achieved.

The pressure-sensitive adhesive applied to the pressure-sensitive adhesive printing sheet of the present invention was adjusted as follows.

Adjustment example 1 Cybinol X-10-954E (manufactured by Seiden Chemical Co., Ltd.) and Cyroid 404 (average particle size 10μ) (manufactured by Fuji Davison Chemical Co., Ltd.) were adjusted to 10:1.5 (wt%).

Adjustment example 2 Cybinol X-10-954E and Cyroid 244
(average particle size 3.5μ) was adjusted to 10:1.5 (wt%).

Adjustment example 3 Cybinol X-10-954E and Cyroid 244
(average particle size 3.5 μ) and cornstarch (manufactured by Nihon Shokuhin Kako Co., Ltd.) were adjusted to 10:1.5:0.5 (wt%).

Adjustment example 4 Cybinol
Adjust to.

Adjustment example 5 Crossren SK (manufactured by Takeda Pharmaceutical) and Thyroid 404
(average particle size 10 μ) was adjusted to 10:1 to 1.8 (wt%).

Adjustment example 6 Latex 636 (manufactured by Asahi Dow) and Thyroid 404 (average particle size 10μ) were adjusted to 10:1 to 1.8 (wt%).

Adjustment example 7 Crosslen SK72 and Thyroid 244 (average particle size
3.5μ) to 10:1 to 1.8 (wt%).

Adjustment example 8 Chlorens SK72 and Thyroid 244 (average particle size
3.5μ) and cornstarch (manufactured by Nihon Shokuhin Kako Co., Ltd.)
Adjusted to 10:1.5:0.6 (wt%).

Adjustment example 9 Latex 636 and activated clay (manufactured by Mizusawa Chemical Co., Ltd.)
10: Adjusted to 2-3 (weight%).

In addition, in the above-mentioned Examples, a thickener is used as necessary.

Each of the pressure-sensitive adhesives prepared as described above was applied uniformly to a printing sheet to a thickness of about 3 to 15 μm, and the following tests were conducted.

Load 300g/in a constant temperature bath at each temperature between 30℃ and 70℃
cm ² After being left for 1 hour, peeling was performed at 90° using a tensile tester, and the results showed that the peel strength was less than 2 g in all cases, and although the conditions were more severe than the storage conditions of stacked sheets for normal printing, there was no blocking caused by the adhesive. No phenomena were observed at all.

In addition, even when heated with a hot roll at 200°C to 240°C, the adhesive surface is uneven due to non-thermoplastic fine particles, and the fine particles prevent the adhesive surface from coming into direct contact with the hot roll, so even if the adhesive softens. Even if this phenomenon occurred, no adhesive was observed to adhere to the roll, no adhesive peeled off in an abrasion test with a load of 500g, and even when bonding with adhesive, the adhesive of the form was placed against each other at 120kg/cm The adhesive surface was made uniform by the pressure applied by the ordinary sealing machine ⁽²⁾ , and the adhesives were able to adhere firmly to each other, and various effects were confirmed, including good adhesion.

The pressure-sensitive adhesive printing sheet of the present invention is used as a trifold envelope form shown in FIG. 1 or a bound form shown in FIG. 2.

In addition, the same effect as above can be obtained when using an adhesive with higher or lower heat resistance than the adhesive used in the examples, or when using an adhesive that has the property of adhering under strong or weak pressure. It is.

(Effects of the Invention) As described above, the pressure-sensitive adhesive printing sheet of the present invention has oil-absorbing, non-thermoplastic fine particles with an average particle diameter of 1 to 20 μm protruding from the surface of the pressure-sensitive adhesive layer. Since it is formed in an uneven shape, when printing sheets are stacked during storage and transport, the adhesive itself does not come into direct contact with objects, so there is no blocking phenomenon caused by pressure-sensitive adhesives. The sheet for printing can be transferred smoothly and reliably to the printer during printing, and it has excellent heat and abrasion resistance during printing, and even after printing with an electronic printer, it also uses silicone oil. Even after printing with a printer, the adhesive properties of the adhesive are not impaired in any way, and the adhesive can be bonded using a predetermined pressure and heat and pressure.

Therefore, Special Publication No. 51-30830, Special Publication No. 51-46470
Tri-fold envelopes, double-fold envelopes, bi-fold envelopes, postcards, various notification forms, etc. disclosed in Japanese Utility Model Publication No. 55-26125, Utility Model Publication No. 49-35629, Utility Model Publication No. 49-40536, and other patent publications, etc. It is effective for pressure-sensitive adhesive printing sheets such as bound forms and window-perforated bifold envelopes, similar forms thereof, and other pressure-sensitive adhesive printing sheets.

[Brief explanation of the drawing]

FIG. 1 is a view showing the state in which the pressure-sensitive adhesive printing sheet of the present invention is used as an envelope form. FIG. 2 is a view showing the pressure-sensitive adhesive printing sheet of the present invention in a bound form. A...Pressure sensitive adhesive, B...Envelope form, C...Binding form.

Claims (1)

[Claims] 1. A printing sheet that is used by printing notification information and then adhering it with a pre-applied adhesive.The adhesive part of this printing sheet is coated with a pressure-sensitive adhesive that would not normally adhere. This pressure-sensitive adhesive has oil-absorbing, non-thermoplastic fine particles with an average particle size of 1 to 20 μm dispersed therein, and these fine particles form an uneven surface on the pressure-sensitive adhesive layer. A printing sheet for pressure-sensitive adhesive, which is characterized by: