JPH0254255A - Laminated element and method of preventing bleeding thereof - Google Patents

Abstract

PURPOSE:To prevent bleeding from the end part of a photosensitive layer during taking up and preserving and to improve preservation stability by coating the end part of a roll with a sheet-shaped desiccating agent. CONSTITUTION:After a photosensitive film 2 formed with the photosensitive layer is wound on a cylindrical winding core 1, the roll end part of the laminated element is coated with the sheet-shaped desiccating agent 3. The photosensitive film having the photosensitive layer refers to the film obtd. by forming the photosensitive layer on a plastic film such as polyester film. A photosensitive resin compsn. consisting of, for example, a film property imparting polymer, ethylenic unsatd. compd. and initiator which generates a free group by active rays, etc., are used for the sheet-shaped desiccating agent resin. The bleeding of the photosensitive layer from the roll end part of the laminated element is effectively prevented in this way.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a laminate element in which a photosensitive layer is prevented from bleeding out, and a method for preventing bleeding of a photosensitive layer. In a laminate element in which a photosensitive film coated on a film and dried is wound around a core, oozing of the photosensitive layer from the end of the element is prevented during storage and oozing of the photosensitive layer 1
The present invention relates to a method for preventing 2.

(Prior art) A photosensitive film, a so-called dry film, used in the production of printed wiring boards, etc., is a film in which a resin component in the form of a μm film dissolved in a solvent is applied onto a support film with a thickness of 10 to 50 mm. The photosensitive layer is prepared by drying to remove the solvent and further laminating 20 to 50 layers of cover film as required. This kind of photosensitive film is made of plastic.

For cores made of paper, etc. with an outer diameter of 30 to 300ffIIr+.

It is stored as a roll-shaped laminate element wound up with a length of 30 to 200 m. When used, if there is a cover film, it is removed and the photosensitive layer is thermocompression bonded onto the substrate. Since this photosensitive layer needs to adhere well to the substrate, it is flexible and sticky at room temperature. In addition, the photosensitive layer is fluid even at room temperature, and after bonding the photosensitive layers to a thickness of 2 atn, a disk shape of 20 rrn pi was punched out and used as a test piece. Apply a load of 5 to 9 on the test piece 4,
The test piece exhibits fluidity such that the change in thickness when left at 30° C. for 15 minutes is 200 μm or more. 5 in FIG. 4 is a dial gauge. Therefore, the photosensitive layer tends to flow at room temperature, and if stored at room temperature, it will seep out from the end face of the roll, and the glabella will adhere to the end of the roll, making it impossible to unwind the roll during use.

Even if rewinding is possible, there is a problem in that the rewinding workability is significantly deteriorated.

Conventionally, the method for solving this problem was to heat the laminate element at a low temperature of 5 to 15 degrees Celsius and a temperature of 60 degrees or less: 5! , - 1 degree Celsius is known, but it is difficult to maintain low temperature and low humidity during transportation as a product, and some users may not be able to store it under these conditions.

In Maku U.S. Patent No. λ867.153.

As a method for preventing the photosensitive layer from bleeding out from the edges of a roll-shaped laminate element, a method is disclosed in which photopolymerization is carried out at the edges. Although this technology can certainly prevent bleeding, it increases the number of steps and increases product cost.Moreover, the photopolymerized portion at the edge is thermocompressed to the substrate, and it peels off from the substrate during the development process. There was a drawback that it caused adverse effects such as re-adhesion to the center of the substrate.

Further, in US Pat. No. 15,639, a basic monomer such as alkyl acrylamide is copolymerized with a binder polymer in a photosensitive layer.

Techniques have been disclosed for preventing the photosensitive layer from oozing out from the edges. However, since this method also copolymerizes a basic monomer, there are practical problems such as a decrease in stability during storage of the film and limitations on properties such as developability.

(Problems to be Solved by the Invention) An object of the present invention is to provide a laminate element with good storage stability, which prevents bleeding from the edges of the photosensitive layer during storage after winding up 9 rolls.

(Means for solving problems) The present inventors created a film on which a photosensitive layer was formed.

In a laminate element wound around a cylindrical core,
As a result of intensive research into the seepage of the photosensitive layer from the roll ends, we found that the seepage of the photosensitive layer from the roll ends is particularly influenced by the winding pressure of the roll, storage temperature, and moisture in the air. I found it. That is, as the photosensitive layer at the end of the roll absorbs moisture in the air, local plasticization is rapidly promoted and the photosensitive layer oozes out.

Therefore, it was discovered that by covering the roll ends with a desiccant, it is possible to prevent the photosensitive layer from seeping out from the roll ends, leading to the present invention.

The present invention provides nine laminate elements in which a photosensitive film on which a photosensitive layer is formed is wound around a cylindrical core, and the ends of the roll are covered with a sheet desiccant; The present invention relates to a method for preventing bleeding of a photosensitive layer covered with a desiccant.

The sheet desiccant used in the present invention includes calcium chloride, silica gel, and molecular sieves.

Disperse, impregnate, apply and dry a desiccant or water-absorbing agent such as saccharides, especially saccharides with high osmotic pressure, or water-absorbing resins, into moldable materials such as natural celluloses, 2 synthetic celluloses, glass cloth, or nonwoven fabric, or These desiccants are made by sandwiching water-absorbing agents with these moldable materials.

In addition, vinylon film, polyester film, polyethylene film,
A polypropylene film, a Teflon film, a nonwoven fabric, etc. may be bonded together. 7-T-shaped desiccant.

As long as the desiccant is in the form of a sheet, there are no particular restrictions on its manufacturing method, materials, etc.

I-day desiccant made by Japan Low Temperature Drying Industry■, Showa Denko△ ■Manufactured by Bichitoshito, etc.

In the present invention, as shown in FIG.
By covering the roll end of the laminate element with a sheet-like desiccant 3 as shown in FIG. 3) and FIGS. 3a and 3b, as shown in FIG.

The photosensitive film having a photosensitive layer in the present invention refers to a film obtained by forming a photosensitive layer on a plastic film such as a polyester film, polyethylene film, polyglopylene film, or Teflon film. There are particular restrictions on photosensitive resins, such as - film-like polymers known for their aggregation;
A photosensitive resin composition comprising an ethylenically unsaturated compound and an initiator that generates free radicals by actinic radiation is used.

(Effects of the Invention) The present invention effectively prevents the photosensitive layer from seeping out from the roll ends of the laminate element.

Next, an example will be explained.

Example 1 Acrylic polymer with film properties as photosensitive layer.

A photosensitive film containing an ethylenically unsaturated compound and an initiator that generates free radicals by actinic radiation, and is coated and dried on a polyethylene terephthalate film.

The fluidity of the photosensitive layer of PHT883AF-50 (manufactured by Hitachi Chemical Co., Ltd., resin layer thickness 50 μm) was measured using a blast meter shown in FIG. 4, and the fluidity after 15 minutes at 30° C. was 200 μm. This photosensitive film has a 50 μm thick photosensitive layer on a 20 μm thick polyester film.

Further, a 35 μm thick polyethylene film was laminated on top of the photosensitive film, making it a three-layer photosensitive film. Cut this film into a width of 120m't - 3301m1.
Place the end of the laminate on the ozo III vinyl chloride vibrator.
(Fig. 1) was stored in a constant temperature and humidity chamber at 30°C, 90% R, H, and the storage stability was investigated.
The photosensitive layer oozed out from the end of the roll after 5 days, but in the case of laminate element B, there was no oozing 17 of the photosensitive layer even after 5 days. The fluidity was measured using a plastometer as follows: The photosensitive layer was peeled off from the support film, and 20 layers were stacked to a thickness of 2 m without air bubbles, and a test piece was punched out using a dumbbell-shaped punching sheet of Mnl. .

Next, the blast meter and test piece were left in a constant temperature room at 30°C for 10 minutes, and then set as shown in Figure 4. A load of 5 to 9 was applied to the test piece, and the thickness of the test piece was measured after 15 minutes. The amount of change in thickness was read from a dial gauge, and the amount of change in thickness after 15 minutes was determined as fluidity.

[Brief Description of the Drawings] Fig. 2 is an external view of a conventional laminate element. Figures 3a and 3b are front and side views of the sheet desiccant. FIG. 1 is a schematic diagram of the external appearance of a laminate element according to the present invention, and FIG. 4 is a schematic diagram showing a method for measuring fluidity using a blastometer. Explanation of symbols 1... Core 2... Photosensitive film 3
,...Sheet desiccant 4...Test piece 5...Dial gauge filling Figure 1 and Figure 2 Agent Patent attorney Hikoa Wakabayashi 37 Written amendment to Figure 4 procedures (voluntary) 1986 9 Month 308 2 Name of the invention Laminate element and method for preventing its oozing 3 Person making the amendment 1 Relationship with cattle Patent applicant name (44
5) Hitachi Chemical Co., Ltd. 4 Agent 5, Detailed explanation of the invention and brief explanation of the drawings in the specification subject to amendment, Drawing 6, Contents of the amendment 1) Page 3, line 7 of the specification of the application 2) From the 3rd line to the 2nd line from the bottom of the 3rd page, "Photosensitive layer oozes out"
I have corrected the statement to "bleeding of the photosensitive layer." 3) In the first line of page 4, the text ``k seepage'' has been corrected to ``bleed out''. 4) On page 4, line 9 K, the text ``bleeding J'' has been corrected to ``bleeding''. 5) In the 5th line from the bottom of the 4th line, change "K oozing" to "
I corrected it to ``ooze''. 6) On page 9, lines 5 to 9, ``Figure 2 is an external view of a conventional laminate element, Figures 3 a and b are a front view and side view of a sheet desiccant, and Figure 1 is an external view of a conventional laminate element. 4 is a schematic diagram illustrating a method for measuring fluidity using a plastometer." FIG. 2 is an external view of a conventional laminate element, FIGS. 3a and 3b are front and side views of a sheet desiccant, and FIG. 4 is a schematic diagram showing a method of measuring fluidity using a blast meter. ” I am corrected. We will correct the drawing as attached. Above is the first power chart section.

Claims (1)

[Scope of Claims] 1. A laminate element in which a photosensitive film on which a photosensitive layer is formed is wound around a cylindrical core, and the ends of the roll are covered with a sheet-like desiccant. 2. A method for preventing oozing of a photosensitive layer, which comprises covering the roll end of a laminate element in which a photosensitive film on which a photosensitive layer is formed is wound around a cylindrical core with a sheet desiccant.