JPS5982477A - Dyeing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention 11 relates to a method for dyeing hydroquine methacrylate resin or a resin containing this as the main monomer component.

Hydroxy methacrylate resin '+'! Although it is insoluble in water due to its molecular structure containing hydroxynore groups, it is characterized as a resin with extremely excellent hygroscopicity and water-swellability. Traditionally, this resin has been used as a film,
Several applications have been developed that take advantage of this property by processing it into films, molded products, etc.

These masohzoh characters can be dyed depending on the purpose.

Naturally, it is necessary to print both images such as pictures. However, due to the characteristics of this resin, it must be used in an atmosphere of water or steam, so it is impossible to print with ordinary oil-based inks, and it is impossible to print with water-based inks or even water-based inks. Even if printing and dyeing can be done using a dyeing solution, the resin swells with water and will not be dyed but eluted.

To give an example of what has been attempted in the past, for example, when it comes into contact with a water-soluble dye solution such as hydroxymethacrylate resin, it is easily dyed and clear images can be obtained, but if it is kept in water for a long time, the dye gradually dissolves. Then, the image disappears. In addition, if you print on the surface of the garment with a general ink in which dyes, pigments, binders, etc. are dissolved and dispersed in an oil-based brightening agent, even if the print is clear for a time,
When stored in water for a long time, the adhesive strength of the ink weakens, and the printed image gradually becomes thinner. As in the above example, when printing or dyeing hydroxy methacrylate resin products, the commonly thought method of using adhesive chips of ink or method I, which involves simply dyeing tree manure, are inappropriate. It became clear that

The present invention was created as a result of intensive research with this point in mind.
The gist of this method is to infiltrate a desired part of arsenic resin with a photosensitive tetrazolium salt, and then expose the resin to light absorbed by the photosensitive tetrazolium salt. There are dyeing methods with different characteristics,
This is an extremely effective method that fundamentally overcomes the drawbacks of the conventional method, and the basis of this invention is the underwater treatment, which allows the dye to become tangled within the polymer network structure of the resin. Even when swollen with water, it is easy to print out (flow) and can form extremely stable dyed images.

Next, a more specific explanation of the present invention will be given.

First, the photosensitive tetrazolium salts are water-soluble and have a strong affinity for the hydroxy methacrylate resin.

When a dye solution or ink containing this salt is brought into contact with the resin, it will penetrate into the resin. In this state, it is colorless, but when the resin impregnated with the tetrazolium salt is then exposed to ultraviolet light, a water-insoluble 70,000 lumazane dye is generated in the resin, and a stable dyed image can be formed. There are many types of photosensitive tetrazolium salt IC derivatives on the market, but two representative examples are:
．． 3.5-Tri Phenyl tetrazo
lium Chloride, TetrazolRe
d, Tetrazolium Violet, Te
trazolium Purple.

N1tro Blue Tetrazolium
Soft contact lenses have recently attracted attention as an application example of 0-hydroxy methacrylate resins.

This is because this resin is optimal as a contact lens material because it is soft and hydrophilic even when swollen in water, and there is no discomfort when it is deposited inside the eye. Since the curvature and lens power of these contact lenses differ depending on the user, a code and number must be displayed near the periphery of the lens to distinguish them. Moreover,
This display 1. It is necessary to measure the curvature and degree in the same state as in actual use, that is, in a state sufficiently swollen in water, and then immediately after the measurement, in a state in which the material is sufficiently swollen in water. Furthermore, the printed markings displayed must not disappear during the lens installation process, or even during the sterilization process by boiling in boiling water several times. The printing method of the present invention is extremely effective for printing under such special conditions.

Examples will be described below.

11 ≦ 2: → ~ 4° bow ke C toe int, - too. . −
÷−1
[ノ,1;ノf41
Grip ← Anti-aggregation 1'--"- <Example 2> Film lQ2 uniformly coated on a triacetate film base made of 2-hydroxyethyl methacrylate resin
, 3.5- Immerse in a 20% aqueous solution of triphenyltetrathulium chloride for about 15 minutes (pre-soak), and remove stiffness.
After removing the solution from the surface, a transparent original was passed through a 2 kW mercury lamp onto the transparent film for 5 minutes.
When projected for a minute, a clear red side [elephant] was formed. Thereafter, this film was immersed in hot water to elute the tetrazolium salt in the non-image area. In order to investigate the dyeing properties of the film dyed using this method, the film was boiled in boiling water for several hours (fastness test), but it was confirmed that the color did not fade and the dyeing was strong. It was. still.

When other photosensitive tetrazolium salts were dyed in the same manner, similar results were obtained.

patent applicant Toppan Printing Co., Ltd. Representative Kazuo Suzuki

Claims (1)

[Claims] Then, a photosensitive tetrazolium salt is infiltrated into the desired part of the fat, and then the fat is washed. A dyeing method characterized by exposure to light absorbed by a photosensitive tetrazolium salt.