JPS59131929A - Manufacture of photographic printing paper - Google Patents

Abstract

PURPOSE:To restrain occurrence of slime in a paper stuff, to prevent defective appearance and poor formation of the paper, and to obtain the superior photographic printing paper by adding a specified compd. to the paper material. CONSTITUTION:An intended purpose is achieved by adding to a paper stuff a thiazoline type compd. represented by structural formula ( I ) or (II) as a slime controller. An amt. of said compd. to be added depends upon a kind of pulp, kinds of paper strength enhancing agent and sizing agent, and amts. of them to be used, but the range of 10-200ppm of the solid material for paper making is preferable. Either of the continuous method of adding it together with the paper strength enhancing agent and a defoaming agent at the same time, and the intermittent impact addition method may be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing photographic paper, and more particularly to a method for producing photographic paper with less slime generation, which is characterized by adding a thiazoline compound to the paper stock. It is.

The slime that occurs in paper mills is made up of bacteria and filamentous fungi.

It is a viscous mass in which microorganisms such as yeast and algae and the metabolic substances produced by them are intertwined and accumulated, and many of them are
It is a colored amorphous object.

Quality problems caused by slime include: (1) Colored spots appear on the paper.

゛(2) Transparent spots appear on the paper surface (3) Deterioration of paper formation, clogging of wires and blankets 9, resulting in poor drainage and formation defects, etc. □ Especially for photographic printing If paper has transparent or colored spots on its surface or areas that impair its appearance, such as poor formation, it will have no commercial value.

In addition, as for operational problems, (1) Piece of paper, (2) Deterioration in blanket quality; 2. It causes things like.

Slime control is necessary because the trouble caused by slime is large and the damage it causes is enormous.

Microorganisms, which are the main cause of slime, are brought in by the water used, raw material pulp chemicals, etc., and it is difficult to prevent this.

An effective method for controlling slime is to use chemical agents to sterilize and inhibit the growth of microorganisms that have entered the paper manufacturing process.

Conventionally, various substances have been proposed for slime control agents, and the ingredients can be categorized into metal compound-based, chlorine compound-based oxidizing agents, organic nitrogen-sulfur-based, organic slime-control agents, and organic sulfur. There are threads, nitrofurans, etc.

However, most slime control agents, even though they have a slime control effect, have side effects such as excessive foaming during the process, impairing the hue and size of the product, and are dangerous to the human body. It has drawbacks such as giving a bad impression to the silver salt emulsion used as paper.

Therefore, an object of the present invention is to provide a process for producing photographic paper with excellent short-term cost using a slime control agent that does not have these drawbacks.

These objects of the present invention are achieved by a method for manufacturing photographic paper, which is characterized in that a thiazoline slime control agent represented by the following structural formula (1)-E7c is added to paper stock. It was done.

In carrying out the present invention, the amount of the compound of Structural Formula (1) or Structural Formula (If) to be added will vary depending on the type of bulb, degree of beating, paper strength enhancer, type of sizing agent, and amount added. , about 10 ppm to 200 ppm to paper solid content
The ppm range is wide. The addition method is a continuous addition method in which it is added continuously at the same time as a paper strength enhancer, antifoaming agent, etc.
Although there is an impact addition method 5 in which addition is performed intermittently, either addition method may be used.

A photographic paper sheet produced by the method of the present invention,
A method in which a photographic emulsion is applied directly onto paper, a method in which a coating layer such as baryta is provided and a photographic emulsion is applied thereon, or a synthetic resin layer such as polyolefin is extruded on one or both sides, or A photographic emulsion can be applied to a piece made by pasting it together.

According to the present invention, by adding a compound represented by the structural formula (11) or structure f(11) of thiazoline yarn to the paper stock as a slime control agent, (1) the paper stock and
It is possible to suppress the generation of slime during the manufacturing process, prevent defects in paper appearance and poor formation, and make it possible to produce excellent photographic paper.

(2) It is possible to produce a stable product without completely inhibiting the size effect of the internal size or changing the hue.

(3) Photographic paper with excellent photographic properties for silver salt emulsions can be produced.

Effects such as

EXAMPLE 9 The present invention will be explained in more detail with reference to Examples below.

Example 1 Kraft method hardwood powder (LBKP) jo wt% and hisulfite broad HL baroo) (LBS P l j
A 2% pulp slurry consisting of 0%
-, 2 2 7 m-j r /e /l/pu no 7
11-ness" is described in detail. ) 300ml
A paper stock with K adjustment was made. Stearin sodium drink o. After dissolving tg, adding all the ingredients and stirring thoroughly, p)l is ≠. Aluminum sulfate until crumbly
Total addition of Et-nium. A compound represented by structural formula (I) was added as a slime control agent to θ00 ml of this paper stock.

Using this stock, paper was made after the paper stock was leveled.

This is called sheet (1). The above paper stock (il-1 day 3
After being stored in an atmosphere of 0°C rO%, the paper stock is completely filtered (2, the filtrate is called liquid (1). The basis weight and thickness of the paper are 1309
7m2, /10μ.

Example 2 Paper and liquid were prepared in the same manner as in Example 1, except that a compound represented by structural formula (n) was used as a slime control agent. This is called sheet (2+, armpit (2)).

Comparative Example 1 Paper and liquid were prepared in the same manner as in Example 1, except that the nitrofuran-based compound nitrofurazone was used as the slime control agent. These are referred to as sheet (31) and liquid (31).

Comparative Example 2 Paper and liquid were prepared in the same manner as in Example 1 except that no slime control agent was used. See this) (4)
, liquid (4).

The effects on the size, whiteness, and complex salt emulsion of each sheet obtained are shown in Table 1, and the ninhydrin reaction of the tani liquid is shown in Table 1.

The permeability test is performed using the TAPPI standard test method (T-g≠/m-
The permeability of the photographic developer was tested based on the Cob Size Test of AO). That is, the weight of the developer permeated from the surface of the paper at 0.00711 vrL2 in 1.20 seconds was measured.

The alkaline sizing rate was measured using 70% hydroxide using the same method as the Stekecht sizing test of JIS-P-4/22.) The permeation rate of IJum was measured using thymol blue as a dye.

Whiteness 1ltJ T S -P -J' / 2 j (
It was measured based on the Hunter whiteness test method of D paper Oyohino e Rupu.

The test method for the effect on silver salt emulsions was to make a complete photographic paper using the prepared sheet, store it in an atmosphere of po℃ and tO% for 3 days, and then develop the prepared photographic paper without exposing it to light. The shadow 4iI on the complex salt emulsion was investigated by visually observing the change in hue.

10- Table 2 Ninhydrin reaction is a test method used for the qualitative determination of slime.

0.005 ml of a 1% aqueous solution of ninhydrin was added to 10 ml of Solution F, and the degree of discoloration of the liquid to reddish-purple was visually judged.

As seen in the results in Tables 7 and 7, sheet (1) and sheet (2) obtained by the method of the present invention have a large size effect.
Liquid (2) has no harmful effects, no decrease in whiteness, and no adverse effects on the complex salt emulsion.Liquid (2) is in good condition with no slime formation.

−／　l　− 212-

Claims (1)

[Claims] A method for producing photographic paper, the method comprising adding a thiazoline slime control agent represented by the following structural formula (1) or (1) to a paper stock.・