JPS60204387A - Thermal transfer type film ribbon - Google Patents

Abstract

PURPOSE:To provide the titled film ribbon prevented from sticking or slipping, wherein a thermally transferrable ink layer is provided on one side of a film base, and a sticking-preventing layer comprising a styrene-butadiene copolymer as an effective constituent is provided on the other side. CONSTITUTION:The thermally transferrable ink layer is provided on one side of the film base (e.g., a polyester film base), and the sticking-reventing layer comprising a styrene-butadiene copolymer as an effective constituent is provided on the other side to obtain the desired film ribbon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal transfer type film ribbon having a stick prevention plate on the other side of a film base material.

Conventionally, in this type of thermal transfer film ribbon, silicone resin is applied to the surface of the film base material on the side where the thermal head slides in order to prevent the thermal head (a phenomenon in which the film base material melts and adheres (generally referred to as stick)). ,
Alternatively, a layer of resin containing an abrasive material such as G1 fluororesin powder (hereinafter referred to as the "stick prevention layer") is provided, but this stick prevention layer has extremely good pickling properties, so it actually prevents slipping. This has the drawback of causing a feed delay when driving the ribbon.

This is because it was thought that it would be better to reduce the frictional resistance as much as possible, since the phenomenon of sticks is apparently similar to poor feeding due to high frictional resistance.

The present invention departs from such conventional technical common sense and forms a stick prevention layer using as an active ingredient a material selected from among materials that are considered to have high frictional resistance. Prevents slippage +L
L, which is characterized by ensuring good feeding of the ribbon.

As a result of numerous experiments, the present inventors surprisingly found that
By incorporating styrene-butadiene copolymer, which has been widely recognized as being easily softened by heat and having high surface friction resistance, as an active ingredient in the anti-stick layer, it prevents not only stick but also slip. Find out the scales that will ensure good feeding of the ribbon,
This led to the completion of the present invention.

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

Examples 1 to 27 A coating liquid for an anti-stick layer having the composition shown in the following table was applied to the other side of a 6 micron thick polyester film substrate (one side of which was provided with a normal heat transferable ink layer) and dried. A stick prevention layer was formed.

The amounts of each substance shown in the following table are parts by weight when the total amount of the dry anti-stick layer is 10 parts by weight.

When the thermal transfer film ribbon obtained in each of the above Examples was used to print with a thermal transfer printer (Xerox P6 printer) at a speed of 8 lines/second in A4 size short width, no stick or slip was observed.
Further, powder falling did not occur even with w4Il powder gold powder.

Comparative Example 1 Instead of the stick prevention layer of the above example, a stick prevention layer made only of silicone resin (coating after drying 11.5
g7. When the same printing test 1 as in the above example was carried out using the thermal transfer type film ribbon formed with t),
Slip occurred in the ribbon wound into a roll, causing printing and line spacing to expand and contract in the feeding direction of the recording paper.

Comparative Example 2 A thermal transfer mold in which a stick prevention layer (coating amount after drying: 1 o/m'') was formed by dispersing 2 parts by weight of fluororesin powder in 8 areas of nitrocellulose in place of the stick prevention layer of the above example. When a printing test similar to that of the above example was conducted using a film ribbon, slipping occurred as in Comparative Example 1, and fluororesin powder adhered to the natural head, resulting in missing G in printing.

The anti-stick layer in the present invention may be composed of only styrene-butadiene copolymer, or styrene-butadiene copolymer.
Various additives may be added to the butadiene copolymer in order to impart or improve other performance without impairing the above-mentioned effects of the butadiene copolymer.

As the styrene-butadiene copolymer, one having a bound styrene content in the range of 5 to 65% by weight can be used, and two or more copolymers having different bound styrene content may be used as a mixture.

Additives that can be used in the present invention include, in addition to those mentioned above, extender pigments such as carbon black, silica, calcium carbonate, and white carbon, and surfactants such as sodium lauryl sulfate, which are effective in further reducing wear of the nurse head. Also, metal powder and the like are effective in improving thermal conductivity to the ink layer. Also,
Conventional antistatic agents may also be blended, which is effective in eliminating various printing hindrances caused by static electricity charging the film ribbon. When using powdered additives, those with an average particle size of about 0.1 to 50 microns are suitable. The various additives mentioned above may be used alone or in combination of two or more.

When the above-mentioned additives are blended into the styrene-butadiene copolymer, the proportion of the styrene-butadiene copolymer depends on the type of additive, but the coating rate after drying of the anti-stick layer is 1i.
The effect can be sufficiently exhibited even at about 0.5 parts by weight per 10 parts by weight, but it is especially recommended to use 2M parts or more, especially 5 parts by weight or more, from the viewpoint of preventing both stick and slip more fully. preferred.

In addition to the above-mentioned solvents, any solvent for preparing the coating solution for the anti-stick layer may be used without particular limitation as long as it dissolves the styrene-butadiene copolymer.

Coating of anti-stick layer I (coating amount after drying, same below)
is preferably about 1 to 0.0111/, among which 0
．． It is best to set it at 5 to 0.05 o/-.

When the coating amount exceeds 10%, the frictional resistance against the thermal head tends to become large, especially when the coating amount exceeds 1.5%.
When iJ/- is exceeded, a phenomenon similar to that of staining often appears. However, this tendency can be alleviated by incorporating the additives shown in the above examples, and it is possible to obtain a product that does not cause such problems even with a coating amount of about 5 g/W11. In addition, the application amount is 0.5Q.
/vl or less, the curling of the ribbon is reduced,
This is preferable because it prevents irregular winding when winding the ribbon into a pancake shape or roll shape and failure to feed the ribbon from the ribbon cassette case. On the other hand, the application amount is 0.01
If the coating amount is less than 0.05 o/m'', the stick prevention effect will be lost.If the coating amount is 0.05 o/m'' or more, the coating amount can be easily stabilized, so that the production yield can be improved.

In addition to the above, film base materials with a thickness of 1 to 2
A suitable thickness is about 5 microns, preferably 2 to 10 microns, and suitable materials include polycarbonate, a resin film such as triacetylcellulose-silon, or cellophane.

Claims (1)

[Claims] 1. A thermal transfer film ribbon comprising a film base material having a thermal transfer ink layer on one side and a stick prevention layer containing a styrene-butadiene copolymer as an active ingredient on the other side.