JPS61127380A - Multiple-time usable lift-off tape - Google Patents

Abstract

PURPOSE:To permit many-time separating and erasing operations to be performed by using a plasticizer having plasticizing effect on polyamide resins for a lift-off layer to be provided for the surface of a base material. CONSTITUTION:A lift-off layer contains a rubbery resin and a plasticizer for a tackifier as the main component. The rubbery resin is a binder for fixing the tackifier to a base material, and the plasticizer has a plasticizing effect on the tackifier as the main component of the lift-off layer and also on the polyamide resin of blue ink for correctors. The preferred amount of the plasticizer is 0.5-20pts.wt. on the base of 10pts.wt. tackifier, more preferably 2-10pts. wt. If the amount of the plasticizer is too small, the blue ink of corrector is insufficiently plasticized and the erasing property of the ink is worsened. If the amount of the plasticizer is too much, the plasticization is overly made to cause the occurrence of transfer to recording papers when reused.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to lift-off tape. More specifically, the present invention relates to a lift-off tape that uses a collector ink ribbon to peel off and erase an impression formed on a recording paper by impact.

[Conventional technology]

Traditionally, impact typewriters have a lift and
An adhesive correction member having image releasability called off-tape is often used.

This tape is designed to peel off and transfer a silver image onto a lift-off tape by printing with an ordinary typewriter, and such a lift-off tape is disclosed in, for example, Japanese Patent Laid-Open No. 54-41941. , Japanese Patent Publication No. 50-1
This is detailed in JP22315 and the like.

[Problem that the invention seeks to solve]

- Conventionally, with this type of lift-off tape, the area that has been used once is covered with collector ink, so when the area is used again, this ink has a peeling force on the lift-off layer. At first, it was said that it could be used only - times because it could not be erased completely.

In view of these circumstances, it is an object of the present invention to make it possible to perform peeling and erasing multiple times even at locations where collector ink has adhered.

[Means for solving problems]

The lift-off tape of the present invention, which can be used many times, has a structure in which the plasticizer of the lift-off layer attached to the surface of the base material has a plasticizing effect on the polyamide resin.

[Action and effect of the invention]

With such a configuration, the present invention enables the collector ink attached to the lift-off layer to exhibit the effect of peeling off the printed image, thereby making it possible to use the print image many times.

To explain this in more detail, collector ink is made into a brittle film mainly composed of polyamide resin in order to maintain the removability of the printed image from the recording paper using lift-off tape. It is common that
When an image formed by such a collector ink is attached to the lift-off layer of the above structure during erasing, the ink becomes sticky due to the action of the plasticizer that has migrated therein. This will have the effect of peeling off the printed image.

The present invention enables the lift-off tape to be used multiple times, which was previously considered impossible, by virtue of the above-mentioned effects of the structure.

〔Example〕

Next, the present invention will be explained in more detail.

The lift-off layer in the lift-off tape of the present invention is a conventional lift-off layer containing a rubber-like resin and a tackifier as main components, and a plasticizer is added thereto.

The rubbery resin is a binder agent for fixing the tackifier to the base material.

The plasticizer may have a plasticizing effect on the tackifier, which is the main component of the lift-off layer, and may have a plasticizing effect on the polyamide resin of the collector ink. . Representative examples of plasticizers having such properties include oleic acid, isostearic acid, polyoxyethylene oleylamine, coconut oil fatty acid jetanolamide, polyoxyethylene lauryl ether, trimethylolpropane monoerucate, sorbitan monolaurate, Examples include tsurudo tansesquioleate, polyoxyethylene sorbitol 1, and tetraoleate. These plasticizers may be used alone or in combination of two or more.

When the plasticizer is used, it is preferably in the range of 0.5 to 20 parts, especially in the range of 2 to 10 parts, when the tackifier is 10 parts (by weight, the same applies hereinafter). If the amount of plasticizer used is too small, the collector ink that adheres to the lift-off layer and is peeled off from the recording paper will not be sufficiently plasticized.
Erasability by re-erasing deteriorates significantly. If the amount is too high, the collector ink that adheres to the lift-off layer and is peeled off from the recording paper may not be plasticized too much, and the plasticized collector ink may be transferred to the recording paper again when reused. .

Suitable examples of the rubbery resin include styrene-butadiene copolymer, polyester resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, and ethylene-vinyl acetate copolymer.

This rubbery resin is 1 to 10 parts based on 10 parts of the tackifier.
It is preferable to use 30 parts, especially in the range of 5 to 20 parts.

Suitable tackifiers include epoxy resins, polystyrene resins, acrylic resins, ketone resins, xylene resins, gum rosin, α-pinene resins, and the like alone or in mixtures of two or more thereof.

A non-volatile liquid may also be used to aid in plasticizing the tackifier. Examples of the nonvolatile liquid include various animal oils and mineral oils, dioctyl phthalate, tricresyl phosphate, dibutyl phthalate, butyl benzyl phthalate, polybutene, terpene low polymers, polybutadiene, and the like.

When the above-mentioned non-volatile liquid is used in combination, tackifier 10
It is used at a ratio of 10 parts or less, especially 1 to 5 parts.

A tack reducer, lubricant, etc. may be added to improve the runnability of the lift-off tape.

Examples of the tack reducing agent include various waxes, low molecular weight polyethylenes, and various non-staining powders, and examples of the lubricant include zinc molybdate, silicone resin, silicone oil, and scaly substances such as talc and mica powder. Examples include pigments.

The tackiness reducing agent is preferably used in an amount of 30 parts or less, and preferably 20 parts or less, per 10 parts of the rubbery resin.

Further, the lubricant is 30 parts or less per 10 parts of the rubbery resin,
It is preferable to use less than 20 parts.

Suitable substrates include films of polyester, nylon, vinylon, cellophane, polypropylene, polyethylene, and the like.

Next, the present invention will be explained with reference to Examples and Comparative Examples.

Examples 1 to 5 Each lift-off layer composition shown in Table 1 was uniformly kneaded using a ball mill, and then coated on a 38 micron thick polyester film, and the solvent was evaporated to form a 2.0 µm thick polyester film.
A 0 micron lift-off layer was formed, and the obtained film-like material was cut into a width of 7 m and a length of 6.5 m, and then wound around a predetermined spool.

Place the spool wound with the lift-off layer on a typewriter (
Canon AP 500) was used to conduct a test in which letters printed with a normal collector-pull ink ribbon mainly composed of polyamide resin were peeled off and erased.

When the erasing operation was repeated over the entire length of the lift-off tape, erasing performance was similar to that of the first erasing until about the fourth time. Further, after the fourth printing, minute ink powder remained on the recording paper, but this had almost no effect on the clarity of reprinting.

Comparative Example 1 Lift-off tapes were prepared in the same manner as in the above Examples, except that polybutadiene, which hardly or not plasticizes the polyamide resin, was used as the plasticizer in each composition in Table 1. When the erasability was examined in the same manner as in the test described above, it was found that the sharpness of reprinting in the second use was considerably inferior to that in the fourth use in each of the examples.

As is clear from this, the lift-off tape of the present invention can be used repeatedly many times, which was previously considered impossible.

[Margin below]

Claims (1)

[Claims] 1. A lift-off tape that can be used many times, and the plasticizer in the lift-off layer attached to the surface of the base material has a plasticizing effect on polyamide resin.