JPS6064882A - Multi-strike ink ribbon - Google Patents

Abstract

PURPOSE:To obtain a film base multi-strike ink ribbon which has high printing density, excellent a sharpness, background contamination resistance and oil bleed resistance by using as components of ink layer metallic salt of lanolin alcohol ester trimellitate. CONSTITUTION:A multi-strike ink ribbon is constructed by forming an adhesive layer of polyurethane, acrylic resin in a thickness of several microns as required on a base material such as a thin polyester film having a thickness of approx. 7 microns, and providing an ink layer containing mainly resin, nonsoluble oil with resin, and colorant thereon. The metallic salt of lanolin alcohol ester trimellitate has worse solubility with resin and good dispersing stability and excellent wettability with colorant, thereby improving printing quality, and reducing good viscosity with solubility with other oil to improve the oil bleed property.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a multi-strike ink ribbon that is excellent in sharpness, dirt resistance, and striking resistance.

Prior Art In recent years, with the development of high-speed typewriters, word processors, etc., typewriter ribbons have replaced conventional fabric ribbons with film bases that can transfer and record high-quality images with clear characters and less background stains. Multi-strike ink ribbons began to be used.

Multi-strike ink ribbon has a sponge structure,
Typewriter is supplied only in one direction, and 6~
It was struck four times and rejected after one pass.

Regarding multi-strike ink ribbon
Publication No. 13426 or U.S. Special Agreement No. 2.820;71
No. 7 specification describes that it is made by mixing a vinyl chloride-vinyl acetate resin with a coloring substance such as vegetable oil and carbon black, which has poor compatibility, and applying the mixture. After that, in order to improve the performance and sharpness of letters, some added foaming agents (such as JP-B No. 47-51405), and others added low-volatile liquids (Toku-Kokoku No. 55-16525). Although such methods have been proposed, a ribbon with sufficient stackability, sharpness, and stain resistance (ink transfer does not occur simply by counting the recording paper) has not yet appeared. .

The resin of the ink layer is required to be strong against impact when struck (desirably no cracking or deformation) and to have good ink release properties. Used are bee-acetyl acetate copolymers or their blends with acrylic resins such as methyl methacrylate-butyl methacrylate copolymers, polyhynyl butyral, styrene-methyl methacrylate copolymers, and the like.

As disclosed in Japanese Patent Publication No. 35-13426, inks that use paste-like substances such as lanolin as a softening agent component in the ink layer have problems such as print density, sharpness, multi-strike property, stain resistance, etc. Print quality is good, but
Oil brinide (ribbon wrapped in a roll, 6
If it is stored at 0 to 70℃ for a day, oil will be added to the back side, and if it is released to a low temperature below room temperature, the unwinding torque will increase, and the back side will come into contact with the boss of each part of the cassette, causing one cassette to overflow. There is a problem in that it is confusing (that the load may cool down when doing so). However, if an oil with a low viscosity is used, on the other hand, the oil bleed will be improved, but the print quality (sharpness, multi-strike performance, stain resistance) will deteriorate, resulting in a situation where it is no longer practical.

Purpose The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a multi-strike ink ribbon with high print density and excellent sharpness, stain resistance and oil bleed resistance.

To +7 In order to achieve the above object, the present invention is characterized in that a metal salt of trimellitic acid lanolin alcohol ester is used as a component of the ink layer. The reason why the metal salt of trimellitic acid lanolin alcohol Nisdel achieves the purpose of the F9f stage is because it has poor compatibility with resins, good dispersion stability, and excellent wettability of the metal salt. This is thought to be because it improves printing quality and also improves oil bleed properties because it has good compatibility with other oils and can lower viscosity.

The multi-strike ink ribbon of the present invention consists of a film crystal phase, a contact 5M layer provided as necessary on the base material, and an ink layer whose main components are a resin, an oil with poor compatibility with the resin, and a coloring substance. Moreover, the oil contains a metal salt of trimellitic acid lanolin alcohol ester as an essential component.

In general, multi-strike ink cartridges are made of a thin polyester film with a thickness of about 7 μm, which is coated with linear polyester, vinyl acetate, polyester, etc., as needed.
1) Adhesion of vinyl, polyurethane, acrylic, etc., to a thickness of approximately μ, is applied on top of the adhesive, and then an ink containing resin, oil incompatible with fat, and colored material η is applied as the main ingredients. It is configured by providing. This ink layer has a sponge structure, and the ink consisting of oil and coloring substances is impregnated into the holes of the resin sponge.

If you apply pressure from the back, the ink will pop out and be transferred. Normally, the print density does not decrease much even if the ink ribbon is removed in the same place about 3 to 6 times, so it is different from the multi-strike ink ribbon.

The multi-strike ink ribbon of the present invention can be made by known methods. That is, it is produced by mixing and dispersing a resin, oil, coloring substance, a solvent for the resin, and if necessary a low-volatility solvent using a hole mill or the like, and then applying the mixture to a film base material and drying it. At this time, an adhesive layer made of polyester, polyurethane, polyvinyl acetate, polyvinyl chloride-vinyl acetate copolymer, or the like may be provided on the film base material, if necessary.

As the resin, conventionally known chloride-vinyl-acetate copolymers, polycarbonates, polyhinyl butyral, etc. can be used. In addition, the coloring substances include conventionally known black colorants such as carphone black, triiron tetroxide, and nigrosine bene;
Blue colorants such as cyanine blue, oil blue, and alkali blue, as well as iozole red, rose bengal, crystal violet, and brilliant green, can be used. Examples of the solvent include methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, etc. for vinyl chloride, vinyl acetate, and dichloroethane, tetrachloroethane, etc. for polycarbonate. Toluene is a low volatile solvent;
There are xylene and paraffin solvents (manufactured by Exxon, Isopar E, G, H, L, M, etc.).

The metal salt of trimellitic acid lanolin alcohol ester in the present invention is an ester of trimellitic acid and lanolin alcohol, and is obtained by neutralizing the unreacted carboxylic acid of trimellitic acid with a metal base. Lanolin alcohol is a higher alcohol having 13 to 36 carbon atoms, most of which are branched, especially with a sterol nucleus. Examples of metal salts include metal salts of sodium, potassium, calcium, magnesium, barium A, nitrogen, manganese, iron, nickel, cobalt, aluminum, and the like. In addition, known oils can be blended with the metal salt of trimellitic acid lanolin alcohol ester, and examples of such oils include vegetable oils such as linseed oil, soybean oil, rapeseed oil, castor oil, and peanut oil, whale oil, and lard. , Mlj oil such as beef tallow, mineral oil, vaseline, lanolin, lecithin, DOI), sodium alkylbenzenesulfonate, and the like. In addition, in the present invention, the oil containing the metal salt of trimellitic acid lanolin alcohol ester as an essential component has a viscosity of 2.
It is preferably 8000 cps or less at 5°C.

EXAMPLES Next, the present invention will be explained in more detail by way of examples as well as comparative examples, but the present invention is not limited thereto. In the examples, all parts are by weight.

Example 1 Mixture with fins Carbon black 5' (Printex L manufactured by Tegusa) Cyanine blue 2# Salt acetic acid copolymer 20" (V, C, C, VYHE manufactured by Tegusa) Methyl ethyl ketone 130 Toluene 20' The above components were dispersed in a ball mill for 24 hours, coated on a polyester film with a thickness of 7 μm to a dry film thickness of 15 μm, and dried to produce a ribbon.

Example 2 Carbon fluff 4 rt Alkali flu 61 Polycarbonate 18 # Methylene chloride 150 l Toluene 60 # The above components were dispersed in a ball mill for 15 hours, and a polyester resin (Vylon+2) was applied to a 6μ thick polyester film.
After applying the adhesive layer of 00) to a thickness of 20μ, the ink layer was
A ribbon was prepared by coating and drying.

Comparative Example 1 A ribbon was produced in the same manner as in Example 1 except that lanolin was used instead of the mixture of trimellitic acid lanolin alcohol ester and calcium salt liquid halafine.

The three types of ribbons produced in the above Examples and Comparative Examples were evaluated for print quality using a Ricoh printer RP-16 [ID, and an oil bleed test was also conducted. The results are listed in the table below.

In addition, the oil bleed test was performed at 6.65 rlj, 30c.
9 ribbons of rn length were stacked together and pressure was applied to I Kf / cm2, left at 60℃ for 1 day and night, taken out, left at 5℃ for 6 hours, took out the center ribbon, set it in a cassette, and tightened it. The load was measured with a gauge.

Print density Example background smudge sharpness Oil bleed example 1 1.05 Very good Very good 200f
#2 1.00 12Or Comparative Example 10.95 Good Good 600? Effects Since the multi-strike ink ribbon of the present invention contains a metal salt of trimellitic acid lanolin alcohol ester as a component of the ink layer, the pore size of the sponge structure and the viscosity of the ink are appropriate, and the printing quality (overstrikeability, printing density, Sharpness) and 1 ruby F properties are also good.

Patent applicant Rico Co., Ltd.

Claims (1)

[Claims] It consists of a film base material, an adhesive layer provided as necessary on the base material, and an ink layer containing a resin, an oil that is miscible with the resin, and a discoloration material as the production components, and an abrasive layer. A multi-strike ink ribbon whose signature is that oil is essential and contains gold S salt of trimellitic acid lanolin alcohol ester.