JPS61201095A - Antistatic laminate material and its production - 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 "Field of Industrial Application" This invention relates to an antistatic laminate material suitable for packaging and interior materials for objects and places where static electricity generation, mold, and bacteria should not be attached, and the production thereof. It is about the method.

"Conventional technology" Traditionally, packaging materials for electronic parts have been made of vapor-deposited plastics, such as those in which a plastic film is vapor-deposited on metal and then an extruded polyethylene laminate for heat sealing is placed on the vapor-deposited layer side of the film. Film-based materials are used.

In addition, as packaging materials and interior materials for objects and places that require static electricity removal and mold resistance, we have applied chemicals such as anti-glaze removers and mold prevention agents to films and sheet-like members, and 3!
l! A cloth material is used.

"Problems to be Solved by the Invention" First of all, the conventional packaging materials for electronic components mentioned above are mainly made of glass film, so they have the disadvantage of being weak against piercing force (tearing force) (and easily tearing). The conductive layer is vapor-deposited nickel/I/lWI, which is close to a metal film and has high heat conductivity, so when heat-sealing, heat conduction from the cooler to the packaging material is rapid, making it difficult to control heating during sealing, and In addition, it is difficult to achieve a clean seal with heat sealing, and the stoichiometry of having to heat seal in two or three times at a somewhat low temperature is also a problem.
No matter how thin the vapor-deposited layer is, it becomes a rough surface, which has the disadvantage of poor transparency and difficulty in confirming the contents.

In addition, for packaging materials and interior materials mixed with or coated with static electricity removers or antifungal agents, the desired static electricity removal performance,
Not only does it fail to provide antifungal performance, but because it uses chemicals, its antifungal ability has a short lifespan, and its range of use is limited in terms of safety.

This invention was made in view of the above circumstances, and can easily perform heat sealing without being easily torn by piercing force (tearing force), and can ensure transparency. The object of the present invention is to provide an antistatic laminate material that can exhibit high antistatic performance and antifungal performance without using chemicals, and a method for producing the same.

"Means for Solving the Problems" The antistatic packaging material according to the present invention includes
A conductive paper made by impregnating a paper made of copper or natural fibers with a copper compound such as sulfuric acid steel or copper, or a conductive paper made of fibers fixed with a copper compound and a heat-melting resin. It is extruded and laminated into a film or sheet.

As mentioned above, the antistatic packaging material of the present invention is made of synthetic wood IJ.
Since the base material is a paper-like material (nonwoven fabric) made of K or natural fibers, it has high durability against external forces such as tearing force, tensile force, and piercing force.

The conductive substance in the conductive fiber that serves as the base material is a copperized figurine, and it is fixed in the fiber, so there is no risk of expiration or the danger of the drug itself, as with miliary coating. High static electricity removal effect can be obtained.

Furthermore, the copper component in conductive fibers is uniformly distributed and fixed in the fibers, and although it has high conductivity, it does not increase heat conductivity. Therefore, the heat-melt resin to be laminated should be one that is easy to heat-seal. For example, with this laminate material, it is easier to control the heat for heat sealing, and it will be possible to seal neatly with one heat seal.Also, the paper-like material used to obtain conductivity should have a basis weight of 5 to 209/2.
ml is preferable; therefore, the fiber density in the paper-like material is low, and there is sufficient space between each fiber, and the laminated film or sheet-like hot-melt resin is transparent, so it can be used as a packaging material. can provide sufficient transparency to confirm the contents.

In addition, as mentioned above, this laminate material has an antistatic effect, and does not attract dust that is a nest of bacteria and mold due to static electricity. Because of this, it can exhibit extremely strong antibacterial and antifungal effects.

Furthermore, since this laminate material is based on a fiber paper product, it has high folding durability, and since the surface of this paper product is coated with a hot-melt resin, it has good water resistance.

In addition, in the anti-power pole laminate material of this invention, one paper-like material is manufactured (sheet-formed) by a wet method, so the length of the conductive fiber is preferably 7 to 30 cm, and the aspect ratio is preferably 300 or more. The blending amount for paper-like products is 3~
20 wt% is desirable.

This is because if the aspect ratio is 300 or more and the length is 7111 or less, the fibers will become too thin and papermaking will be difficult.On the other hand, if the aspect ratio is 30m or more, the fibers will become too thick and it will be difficult to disperse the fibers during papermaking. This is because the properties of the nonwoven fabric deteriorate, making it difficult to produce a high-quality nonwoven fabric. The reason why the aspect ratio is set to 600 or more is that if the aspect ratio is 300 or less, the contact density between the fibers decreases, and even if the copper compound is impregnated with this peroxide, the desired conductivity (surface electrical resistance value 10 Ω or less) cannot be obtained. The reason why the amount of conductive paper is set at 3 to 2 wtl is that if it is less than 3 yt%, the antistatic performance of the product will be below the desired value.
This is because if it exceeds t%, the transparency of the product will decrease, making it difficult to read the contents of the package, for example.

Examples of this invention will be shown below.

"Example" As conductive resin fibers, acrylic fibers having lengths and aspect ratios shown in Table 1 were impregnated with sulfuric acid steel. A mixture of polyethylene and polypropylene was used as the hot-melt resin. The conductive resin fibers were formed into paper having the unit weight (g/ze) shown in Table 1 to prepare conductive paper-like materials.

A film of C9/r is coated with a heat-melting resin on this conductive paper-like material.
rl) to obtain film-like laminate materials (Examples 1 to 6).

[Table 1] Weight of each laminate material obtained: 97 m: ), thickness (n
(amount of conductive paper material (fwt%)), surface specific electrical resistance (Ω・), frictional charging voltage (vp relative humidity 40%RH)
When the Sf/Il fabric) was measured, the results shown in Table 2.3 were obtained.

As can be seen from Fit 2.3, Examples 1 to 6 showed significantly better values for all measurement items, confirming the high performance of the antistatic laminate material of the present invention. did it.

[Table 2] [Table 3] In the above example, a sheet of conductive paper was extruded and laminated with hot-melt resin, but depending on the application, a sheet of conductive paper could be laminated by extrusion. It may also be laminated by sandwiching two extruded layers of a resin with a high melting point and a resin with a low melting point.In this way, a packaging material that has a smooth surface and can be easily heat-sealed can be created. You can get it.

Furthermore, if a thick laminate material is obtained by, for example, providing multiple layers of extruded polyvinyl chloride layers and conductive fiber layers, static electricity, dust, mold, etc. will become a problem in electronic equipment rooms and pharmaceutical storage rooms. It can be used as interior materials such as flooring materials. Moreover, by thermoforming the above-mentioned thick-walled laminate material into a container of a predetermined shape, it is also possible to obtain a container with excellent static electricity removal properties.

"Effects of the Invention" As explained above, the antistatic laminate material according to the present invention is made by impregnating a thin paper-like material made of synthetic resin or natural fiber with a copper compound such as copper chloride. It is made by extrusion laminating a heat-melting resin onto a flexible paper-like material.
It does not tear easily due to piercing force, has high antistatic performance, can be easily heat-sealed, and has transparency. It is ideal as a packaging material for pharmaceuticals and sanitary materials that are susceptible to mold and bacteria, and as an interior material for storage areas for electronic devices and pharmaceuticals.

Claims (7)

[Claims] (1) An antistatic laminate material comprising a paper layer made of conductive fibers and a heat-melt resin layer integrally extruded and laminated to the paper layer. (2) The antistatic laminate material according to claim 1, wherein the conductive fibers have a length of 7 to 30 mm and an aspect ratio of 300 or more. (3) The antistatic laminate material according to claim 1 or 2, wherein the amount of conductive fibers contained in the entire laminate material is 3 to 20 wt%. (4) A method for producing an antistatic laminate material, which comprises extrusion laminating a hot-melt resin onto a paper-like material made of conductive fibers and integrating the same into a film or sheet. (5) The basis weight of the paper-like material made of conductive fibers is 5 to 20 g/
The method for producing an antistatic laminate material according to claim 4, wherein the antistatic laminate material is m^2. (6) The method for producing an antistatic laminate material according to claim 4 or 5, wherein the conductive fibers have a length of 7 to 30 mm and an aspect ratio of 300 or more. (7) The method for producing an antistatic laminate material according to any one of claims 4 to 6, characterized in that the blending amount of the conductive fiber is 3 to 20 wt%.