JPS6182328A - Composition for magnetic recording - Google Patents

Abstract

PURPOSE:To suppress the fogging effect of a sulfur compd. to be exerted to a photosensitive material by incorporating a material having large affinity to the sulfur compd. into a compsn. to be used for forming a magnetic recording layer provided in combination with the photosensitive material. CONSTITUTION:The material having large affinity to at least the sulfur compd. is compounded with the compd. contg. the magnetic material for forming the magnetic recording layer in the stage of forming the magnetic recording layer integrally with the photosensitive material or in contact with or proximity to said material such as a disk film provided with a photographic film 2 and a magnetic recording ring 3. The embodiment of the material having large affinity of the sulfur compd. is exemplified by the hydroxide of the group IA, group IIA and group IIIA element of periodic table (e.g., sodium hydroxide, magnesium hydroxide), the oxide of the group IIA and group IIB elements (e.g.; calcium oxide) an the carbonate of the IA-group and IIA-group elements (e.g.; sodium bicarbonate), etc.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a magnetic recording nail polish W composition, and more specifically, a magnetic recording layer provided integrally with, in contact with, or in close proximity to a photographic light-sensitive material. The present invention relates to a magnetic recording composition used to form a magnetic recording composition.

BACKGROUND OF THE INVENTION In recent years, disk film systems have emerged in which each frame of photographic film for photographing is arranged on the same circumference.

An example of a disc film is shown in FIG. In this example,
In this example, the magnetic recording ring 3 is arranged inside the magnetic recording ring 3.
It is integrally manufactured by injection molding with a display part 4 on which a frame number of 15 is displayed to constitute a support member, and around it is fitted a photosensitive material 2 consisting of a core part 2b and a photographing part 2a of 15 frames in this example. It is worn.

The disc film support member to which the photosensitive material is mounted is a front cover 6 and a back cover 7 connected by a hinge 8 shown in FIG.
It is housed in a case 5 consisting of a disc film cartridge.

Here, the ring 3 is a magnetic recording medium on which printing conditions are recorded.

Recording and reproduction on the ring 3 is performed by a code recording, detection and reproduction method using a magnetic head using a code formed by a combination of 11o+1 and 11o+1.

Ivy.

Conventionally, iron oxide powder has been used as the magnetic particles of the ring 3, but this is manufactured using iron sulfate as a raw material, and the manufacturing method thereof is based on the following reaction.

(1) Fe, 0. Particle manufacturing method: Fe50. + 2NH, (OH)-Fe(oH)2+
(NH4)28643Fe (OH)2 +Na O
H+HNO3-Fe3O4+NaNo2+ 4H20(
2) Production method of Fe, 03 particles: FeSO4・7H20→FeSO4・H20+6H2o
(about 400'C)2F'eso4・H2O-Fe20
s+SO2+SO3+2H20 (dry method) Fe 804
+ 2RDH→E'e (OH2) + I% 80
42FeSO, + I02 +3H20-1-Fe20
3H1(2o + 2H28042H2SO4+2Fe
-2Fe, SO, +2H2 (wet method), i.e., the sulfur compound produced in the above reaction (80X; 803.5o2)
(Sono et al. KI (281[, tranru)) is mixed as an impurity into the obtained Fe50. powder or Fe2O3 powder, although it is a trace amount.

The present inventor investigated magnetic recording ring gold-biased disk films using iron oxide powder as a magnetic material, and found that capri I found my master.

C. Purpose of the Invention The present invention was made in view of the above circumstances, and the purpose is to provide a magnetic recording composition that does not have an adverse effect (particularly fogging phenomenon) on photographic light-sensitive materials. As gold.

2. Structure of the invention, that is, the present invention is a magnetic recording layer that is used to form a magnetic recording layer that is provided integrally with, in contact with, or in close proximity to a photographic light-sensitive material, and that contains at least a substance that has a high affinity for sulfur compounds. It relates to a composition for use. Here, the above-mentioned "magnetism" means a property that easily reacts with a sulfur compound and can convert this compound into another compound, or a property that can trap a sulfur compound.

Substances that have a high affinity with the above-mentioned sulfur compounds include hydroxides of elements in Groups IA, IIA and I of the Periodic Table of Elements, oxides of elements in Groups IIA and IIB, and oxides of elements in Groups IA and IIA. Substances consisting of one or more selected from the group consisting of carbonates of elements are suitable, and the mode of inclusion of these substances in the composition is such that their powders are mixed with magnetic particles. Alternatively, it may be in a state where it is adsorbed on the surface of the magnetic particles.

E, Example Experimental Example 1 NaOH, Ca(OH),, Mg(OH)2, AJ! ,
(OH)3, NaCO3, CaCOs, MgC0,,
3 powders of NaHCO3, Cab, MgO or ZnO
Magnetic Fe50. 0.5 g of powder was cut into a length of 12 cIrL along with a 35 mm color film of A and SA 400, and the volume was 50 mj! Store it in a metal can, seal it, and
It was kept at 5°C for 7 days. Each of the above films was taken out, subjected to wedge exposure, and the fog density of the sample obtained by predetermined development was measured using a transmission densitometer using a filter corresponding to each photosensitive layer. The fog density of the same type of film that was not subjected to the above treatment was used as a blank (reference value: zero), and when the difference from this blank was evaluated, no difference was found.

Experimental Example 2 Magnetic Fe, O, powder produced from iron sulfate was mixed with NaOH
1Ca(OH),,Mg(OH)2 or An(
When the same test as in Experimental Example 1 was conducted using the powder that had been immersed for 10 minutes in an aqueous solution of OH) 3 for 10 minutes and then washed and dried, there was no difference from the blank. ,Ta.

Experimental Example 3 NaOH, Ca(OH),..., Mg(OH)2, Aj!
(OH)3, Na2CO3, CaCOs, MgCO
3. A pellet-like sample with a diameter of 3 m + 1 and a length of 3 mm was used, which was injection molded by dispersing NaHCO3, Cab, MgO, or ZnO powder (particle size 0.1 μm to 0.1 mm) in polystyrene resin. , others are the same as in Experimental Example 1 above.
When the same test as in 1 was conducted, there was no difference from the blank.

For comparison, a similar test was carried out by placing only magnetic Fe50° powder made from iron sulfate and a film in a can, and the difference from the blank was +0.12 for the blue-light photosensitive layer;
Green photosensitive layer +0.09, red photosensitive layer +0.06
Met.

From the above experimental results, hydroxides of elements in Groups IA, ■A, and 1■A of the Periodic Table of Elements, oxides of elements in Groups A and ■B, and elements in Groups IA and HA. It can be understood that a substance selected from the group consisting of carbonates has the effect of suppressing fogging caused by sulfur compounds.-1, the above substances can be used in combination.

Next, specific examples of the present invention will be described.

A disk body 15 having the magnetic recording ring 3 and the display section 4 shown in FIG.
H), , MgO, ZnO1Kl-ICO, or CaC
0.0,0.0 particles (average particle size 10 μm) were blended with magnetic Fe3O4 powder made from iron sulfate, and the mixed powder was dispersed in a polystyrene resin with a coefficient of 10 and injection molded. As shown in an enlarged view in FIG. 3, it was fitted onto the film 2 to form a disk film.

When the fog density of each of these disk films was measured by sensitometry, it was found that each of the constituent layers was substantially O. For comparison, similar measurements were made on a conventional disc film in which the powder was not blended into the disc body, and the fog density was found to be 0 when the blue-sensitive layer was 0.
．． 88, 0.38 for the green photosensitive layer, and O for the red photosensitive layer. It is desired that the fog density is 0.03 or less for each color, and in conventional disk films, the fog density exceeds this value. On the other hand, in the disc film using the composition according to the present invention,
In all examples, the fog density is substantially O for each color, and the fog phenomenon caused by magnetic particles is completely suppressed.

In the composition of the present invention, the content of the substance having high affinity with the sulfur compound described above is 0.1 to 100 parts by weight, more preferably 1 to 1 part by weight, based on 100 parts by weight of the magnetic particles. desirable. Outside this range, if the amount of the above substances decreases, it tends to be difficult to obtain the anti-fogging effect, and if the amount increases, the magnetic material ratio in the components decreases, which tends to cause deterioration of the magnetic properties. When kneaded, it tends to become mechanically fragile. Regarding the content form of the above-mentioned substance, if it is in granular form, the particle size is 0.1 to 100.
It is desirable to set it to μm.

In addition, by containing the substance according to the present invention, it is also possible to suppress corrosion of a mold used for injection molding or the like.

Moreover, instead of the magnetic recording ring 3, a magnetic recording medium of an appropriate shape can be provided at an appropriate position of the case 5 shown in FIG. It is also possible.

The above embodiments are all examples in which the present invention is applied to a disc film, but in addition, as shown in FIG. 4, for example, as shown in FIG. It goes without saying that the same effect as described above can be obtained even if the present invention is applied to the provided movie film 21.

In the above example, Fe3O4f is used for the magnetic particles. The magnetic particles may be Fe, 03 particles or iron powder, but Fe50. In this respect, Fe3O4 particles are suitable for use in a composition provided integrally with a black film support member because of their black color. Further, the substance having a high affinity for sulfur compounds used in the present invention may have other effects in addition to the above-mentioned effects on sulfur compounds.

As described in detail, the magnetic recording composition according to the present invention includes:
Since it contains at least a substance that has a high affinity for sulfur compounds, the fogging effect of sulfur compounds on photographic materials is suppressed.

[Brief explanation of drawings]

Figure 1 is a plan view of the disc film, and Figure 2 is a developed view of the case that houses the disc film. 3 and 4 show embodiments of the present invention, in which FIG. 3 is a cross-sectional view of a disc film, and FIG. 4 is a plan view of a movie film provided with a recording strip area. In addition, in the symbols shown in the drawings, 2.12...lI@film 3...fist/magnetic recording medium ring 4...stand/display section 5...case 13...recording strip area 15 . . . Disc body 21 . . . Movie film.

Claims (1)

[Claims] 1. A magnetic recording composition that is used to form a magnetic recording layer that is provided integrally with, in contact with, or in close proximity to a photographic material, and that contains at least a substance that has a high affinity for sulfur compounds.