JPS5982480A - 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 relates to a method for dyeing resin as a main monomer component.

Hydroquine mech acrylate position 1 fat is. Hydroxyl group?
Due to its molecular structure, it is characterized as a resin that is insoluble in water but has extremely high heat absorption and water swelling properties. Since then, this resin has been processed into films, membranes, molded products, etc., and several applications have been developed that take advantage of its unique properties. These are the tl. It can be dyed depending on the purpose. Naturally, there arises a need to provide both types of marks such as characters and pictures. However, due to the characteristics of this i1 fat, it is used in an atmosphere of water or steam, so it is impossible to print with ordinary oil-based ink. Even if the image can be printed and dyed, the resin will swell with water, so the image will not be dyed and will be eluted.

Here are some examples of what has been attempted in the past. For example, when it is brought into contact with a water-based dye solution such as hydroxy methacrylate resin, it is easily dyed and a clear pattern can be obtained. If you keep it in water for a long time, the dye will gradually elute and lli! ii@
disappears. In addition, if you print on the surface of this (support) 1 product with a general ink containing dissolved or dispersed dyes, pigments, binder resins, etc. in an oil-based solvent, it may be temporarily (even if you can print clearly) If stored for a long time, the adhesive strength of the ink will weaken, and the printed image will gradually become sticky.As in the above example, when printing or dyeing a hydroquine methacrylate resin product, it is normal to think about it. It has become clear that methods that utilize the adhesive strength of ink and methods that simply dye the resin are inappropriate.

The present invention has been achieved as a result of intensive research in consideration of this point, and its gist is to provide a dyeing method for resins in which hydroxyethyl methacrylate or 1F machoht is the main monomer component. This dyeing method is characterized by exposing a desired part of the resin to light using a photosensitive water-soluble resin, and is an extremely effective method that fundamentally overcomes the drawbacks of the conventional method, and is the basis of this invention. As a result of the treatment, the dye is entangled within the polymer network structure of the resin, and even when the resin is swollen with water, it does not run out, making it possible to form an extremely stable dyed side.

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

First of all, it is a water-soluble vat dye leuco type, and this dye 'l'! -As you know, bat dyeing costs ¥4k.

Il'L as it is with a water-bathable compound as a sulfonate.
There are dyes that cause oxidation reactions. Such photosensitive water-soluble vat dye leuco bodies include l, or, for example, 5o.
lubi I 1sed vat yel low 3
, 4.7.8°Red 1.2J'10, BIue
2, 5, 8, Black 1.4.6, etc.

When a staining liquid or ink containing this dye is brought into contact with the abrasion resistant material, the dye penetrates into the resin due to its affinity. This resin is then exposed to light that is absorbed by the dye that has penetrated into it.

The water insolubilization of the dye and the coloring reaction occur within the clear resin,
Very stable images are formed. Staining solution.

In addition to this dye, a stabilizer and additives for improving printability are appropriately added to water to form an ink.

Examples will be explained below.

<Example 1> Transparent film made of 2-hydroxyethyl methacrylate resin 1. Vandt dye Anthorazole 04G (soluble in
Hoechst Co., Ltd.) aqueous solution (A degree 60!//p) for 10 minutes.
a), s and sodium nitrite (concentration approx. o, s g/B)
When immersed in a solution dissolved in water (coloring bath) for 15 minutes,
The film could be uniformly dyed blue. Thereafter, the film was thoroughly washed with water to wash away the dye from the subsequent reaction.

When image (8) is projected onto this transparent film through a transparent original from a 2 kVi mercury lamp, a clear blue image is formed.
It was. Thereafter, the film was sufficiently boiled in hot water to elute the dye *8+ in the non-image area. In order to examine the dyeability of the film dyed by this method, the film was boiled in boiling water for several hours (fastness test).

It was confirmed that strong dyeing was achieved without the color becoming light. In addition, when dyeing was carried out in the same manner using other photosensitive water-soluble vat dye leuco bodies, similar results were obtained.

<Example 2> A soft contact lens processed from cross-linked 2-hydroxyethyl methacrylate resin was immersed in physiological saline to swell. After removing this lens and removing water from the surface, apply 6 parts of soluble vat dye Anthrazol Pink 16B (manufactured by Hoechst), 16 parts of glycerin,
The letters were printed with a porous, sponge rubber stamp impregnated with an ink consisting of 14 parts of water. Thereafter, when this lens was exposed to planocrite (light intensity 2, WΔ) for about 1 minute, clear red letters developed. This dyed letter It sufficiently withstood the same fastness test as in Example 1.

<Example 3> An ink having the composition shown in Example 2 was applied to a predetermined portion near the periphery of the lens shown in Example 2. Then applied J
When a character image was projected for about 2 minutes through a transparent negative original from a 2 kW mercury lamp onto the area where the image was exposed, clear red characters appeared. The lens was then immersed in warm water, and the uncolored parts of the lens were eluted. The dyed letter stripes thus formed satisfactorily withstood the same fastness test as in Example 1.

In Examples 2 and 3, similar results were obtained using other photosensitive Mizumachi d-type bat-dyed leuco bodies.

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

Claims (1)

[Claims] (1) Hydroxyethyl methacrylate polymer or t'Lf In the dyeing method for the resin that is the main monomer component, the desired part of the resin is not exposed to absorbing light that has photosensitivity. Characteristic dyeing method. (2. In claim 1, after infiltrating into a desired position of a soft contact lens made of a hydroxy methacrylate resin, an ink containing a photosensitive water-soluble vat dye and a leuco compound, ?
A dyeing method characterized by exposing to light absorbed by a water-soluble vat dye leuco body.