JPH03366Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to nameplates for thermosetting resin molded products.
In particular, it relates to a name plate for a circuit breaker with an overcurrent protection device made of phenolic resin or polyester resin.

[Technical field of invention]

Conventionally, aluminum vapor-deposited polyester film has been used as nameplates for breakers.

However, thermosetting resins such as phenolic resins emit ammonia, formalin gas, water vapor, etc., while polyester resins emit aromatic gases, so a polyester nameplate is attached to the breaker. Then, the gas generated from the breaker would accumulate between the breaker surface and the nameplate, causing problems such as the nameplate swelling or peeling off due to the gas pressure.

Therefore, an alternative nameplate has been proposed in which a porous material, such as paper, is bonded to the metal-deposited surface of a polyester film, and an adhesive is applied to this paper surface to attach it to the breaker. Utility Model Publication No. 56-32357), this nameplate states that the drawbacks of the prior art can be overcome by allowing the gas generated from the thermosetting resin to escape laterally through the paper surface.

However, such nameplates have the disadvantage that interlayer adhesive strength is poor, and when the attached nameplate is peeled off, the intervening paper is torn, making it impossible to use it again.

In addition, the gas generated from the thermosetting resin is exhausted laterally through the paper layer, resulting in a long exhaust path, and therefore the problem of nameplate swelling and peeling still remains. Ta.

Particularly in large nameplates, the drawback of lateral gas release through the paper becomes more apparent, and it has therefore been impossible to interpose paper in large nameplates.

[Purpose of invention]

The present invention solves the above-mentioned conventional drawbacks, and can prevent the nameplate from swelling and peeling by discharging the gas generated from the thermosetting resin in the thickness direction of the nameplate, and also prevents delamination. The purpose is to provide a nameplate that is not available.

[Structure of the idea]

The present invention to achieve the above object consists of a biaxially stretched polypropylene film A, and an ethylene-propylene copolymer film B or a polyethylene film C laminated on at least one side of the film A, and the surface of the film A is printed. has a layer,
100 to 1000 on the surface of film B or film C
It is characterized in that a metal vapor deposited layer is formed with a thickness of 1.5 Å, and an adhesive is applied on the metal vapor deposited layer.

Hereinafter, the present invention will be explained based on the drawings.

In FIG. 1, numeral 1 indicates a breaker, which is made of thermosetting resin, such as phenolic resin or polyester resin.

A nameplate 2 is pasted on the breaker 1, on which rating information indicating the contents of the breaker, etc. are shown.

FIG. 2 shows a first embodiment of the nameplate 2, in which an ethylene-propylene copolymer film B4 is laminated on at least one side of a biaxially stretched polypropylene film A3, a metal vapor deposited layer 5 is provided on the film B4, and an adhesive layer 5 is provided on the film B4. The agent 6 is applied, and the printing 8 is applied to the surface of the film A3.

FIG. 3 shows a second embodiment of the nameplate 2, which is the same as the first embodiment except that a polyethylene film C7 is laminated on at least one side of a biaxially stretched polypropylene film A3.

Here, the polypropylene constituting the biaxially stretched polypropylene film A3 used in the present invention is not particularly limited, but usually has an isotactic index II of 85% or more,
It is preferably 90% or more, and the melt index MI at 230°C is 0.1 to 50 g/10 minutes, especially 1 to 20 g/10 minutes.
A duration of 10 minutes is preferred.

As the second component other than propylene, for example, ethylene, butene, hexene, maleic anhydride, etc. may be copolymerized in random, block or graft copolymerization, but in view of the spirit of the present invention, homopolymers are preferred.

Note that polypropylene contains known additives such as crystal nucleating agents, antioxidants, heat stabilizers, slip agents, antistatic agents, antiblocking agents, fillers,
It may also contain a viscosity modifier, a coloring inhibitor, and the like.

As the ethylene-propylene copolymer film B4, a film containing 50% by weight or more of ethylene-propylene copolymer, which is a polymer mainly composed of random and block copolymers, is used, and α-olefin polymers such as polyethylene and polypropylene are used. You can also blend them.

The content of the ethylene component is preferably 0.5 to 50% by weight, and in the case of a blend, the content of the ethylene component refers to the total ethylene content of the ethylene-propylene random copolymer, ethylene-propylene block copolymer, and polyethylene.

50% by weight when blending polypropylene
Exceeding this is not preferable because the adhesion of the metal vapor-deposited film decreases.

As the polyethylene film C7, films such as low-density polyethylene, high-density polyethylene, and linear low-density polyethylene are used, and the density is
A range of 0.91 to 0.96 is preferred.

If blending other polyolefins, 20
It is preferably less than % by weight.

The surface roughness of the ethylene-propylene copolymer film B or polyethylene film C is preferably Ra of 0.20 to 1.5 μm in order to have a matte appearance, and Ra of 0.12 μm or less to have a mirror-like appearance. is preferred.

Note that Ra refers to center line average roughness (cutoff value 0.25 mm) and is based on JIS B 060.

To adjust Ra to 0.20 to 1.5 μm, an embossing method or a method of adding inorganic particles may be used, but it is more preferable to use the ethylene-polypropylene block copolymer shown below.

B. It is a block copolymer with an ethylene component of 5 to 50% by weight and the rest being propylene as the main component, and 100 to 50% by weight.
Items with three or more melting peaks at 165℃.

(b) It is a block copolymer with an ethylene component of 5 to 50% by weight and the other main component being propylene, with a melting peak of 126°C or higher and lower than 140°C, and 140°C or higher and lower than 160°C.
The heat of fusion H at each peak has one point each below.
1. H2 satisfies 0.3≦H1/(H1+H2)≦0.7.

If the relationship between the ethylene component, H1, and H2 is outside of the above range for either a or b,
This results in drawbacks such as poor erasability, unevenness in unevenness, poor appearance, and reduced adhesion to metal vapor deposited films.

To make Ra 0.12μm or less, ethylene component 1
Preferably, ~15% by weight of ethylene-propylene random copolymer or polyethylene is used, preferably 2-10% by weight.

If the ethylene component of the ethylene-propylene random copolymer is less than 1% by weight, preferably less than 2% by weight, the adhesion to the metal vapor deposited film will decrease, and if it exceeds 15% by weight, preferably 10% by weight, the surface gloss will decrease. and the appearance deteriorates.

Incidentally, if the crystallization rate is increased by adding a nucleating agent, etc., the surface glossiness can be further improved.

When polyethylene is used, specular gloss can be obtained, but if the density exceeds 0.93, smoothness tends to deteriorate.

In this invention, polypropylene film A/
The thickness of the ethylene-propylene copolymer film B or the two-layer laminated film of the polypropylene film A/polyethylene film C is 8 to 8.
The thickness of film B and film C are both 0.5 to 10 μm.

The metal vapor deposited layer 5 refers to a vapor deposited metal layer, and the metal is not particularly limited, but aluminum is preferable. Further, the vapor deposition method is not particularly limited, and an electric heating fusion vapor deposition method, an ion beam vapor deposition method, a sputtering method, an ion plating method, or the like can be used.

The surface of the laminated film has been subjected to corona discharge treatment,
It is better to perform surface treatment such as acid treatment or fire treatment for activation, and in this case, it is preferable to perform corona discharge treatment in nitrogen gas or a mixed gas of nitrogen and carbon dioxide.

The adhesive 6 is not particularly limited, but pressure-sensitive adhesives are often used.

As the pressure sensitive adhesive, acrylic ester type adhesives are generally used.

The thickness of the metal vapor deposition layer 5 is usually 100 to 1000 Å.
and preferably 200 to 700 Å.

If the thickness is less than 100 Å, preferably less than 200 Å, the light reflectance decreases, the film becomes transparent, the metallic luster decreases, and a blackish appearance becomes undesirable.

Moreover, if it exceeds 1000 Å, preferably 700 Å, gas permeability deteriorates, causing swelling, peeling, etc.

The printed layer 8 may be provided by either partial printing (letters, patterns, etc.) or full-surface printing, or may be provided by multicolor overlapping printing.

In order to make the print look more beautiful and to improve its abrasion resistance, the print layer may be coated with a transparent resin or a film may be laminated thereon.

The printing ink is not particularly limited either, and any ink such as gravure, offset, UV, etc. may be used. Furthermore, an anchor coat layer may be provided on the surface of the film A in order to improve printing ink adhesion.

In manufacturing the nameplate of the present invention, polypropylene is melted at a resin temperature not exceeding 320°C, preferably 200-300°C, while ethylene-propylene copolymer or polyethylene is melted at a resin temperature of
An unstretched two-layer laminate film is produced by melting at a temperature not exceeding 300°C, preferably 200°C, coextruding from a die and casting onto a cooling drum.

Next, the cast film is biaxially oriented to obtain a biaxially stretched laminated film.

As a method for imparting orientation, known methods such as roll stretching, rolling, tenter stretching, disk stretching, belt stretching, and combinations thereof can be used.

[Effect of idea]

As described above, according to the present invention, the ethylene-propylene copolymer film B or the polyethylene film C is laminated on at least one side of the biaxially stretched polypropylene film A, and the surface of the film A has a printing layer. Since a metal vapor deposition layer is formed on the surface of film B or film C to a thickness of 100 to 1000 Å, and an adhesive is applied onto this metal vapor deposition layer, the following effects can be achieved.

B. Since polypropylene film with high breathability is used, gas generated from thermosetting resin molded products can be easily discharged.

Therefore, the nameplate of the present invention does not swell or peel off unlike conventional plates, and can be used for a long period of time.

(b) With the nameplate of the present invention, gas generated from the thermosetting resin molded product can be discharged in the thickness direction of the nameplate.

Therefore, it is not related to the size of the nameplate,
It is possible to manufacture large nameplates, for which peeling has traditionally been a problem.

C. Since the metal vapor deposition layer is formed of ethylene-propylene copolymer or polyethylene, it has strong adhesion, and even when the nameplate of the present invention is peeled off from a thermosetting resin molded product, delamination does not occur and it is easy to do so. can be reused.

Note that the terms used in the present invention will be explained below.

(1) Isotactic Index II A sample film (Wmg) is cut into approximately 1 cm square pieces, placed in a Soxhlet extractor, and extracted with boiling n-heptane for 12 hours.

Next, take out this sample and heat it at 80℃ and 100mmHg.
After vacuum drying for 2 hours, the weight is measured.

If its weight is W' (mg), the isotactic index is calculated by the following formula.

Isotactic Index (%) = 100 x W'/W (2) Melt Index MI Measured at 230°C according to ASTM D-1238-57T.

(3) Vertex of melting peak Perkin-Elmer differential scanning calorimeter model
So-called second-run melting occurs when a 5 mg sample is heated to 280°C at a heating rate of 20°C/min, held for 5 minutes, cooled at the same rate, and heated again using the DSC-2 model. Take a curve.

(4) Heat of fusion Examples are shown in FIGS. 4 and 5.

Among the melting peaks, the melting peak on the low temperature side is P
1. The melting peak on the high temperature side is P2. Also,
The apex of each melting peak, that is, the minimum point of the peak, is defined as A and B, and the temperatures at the apex are Tm1 and Tm1, respectively.
Let it be Tm2.

Next, we will explain how to calculate the heat of fusion at the first peak P1 in Figure 4.
Indicated by First, the starting point T1 and the ending point T2 of the absorption are connected by a straight line (broken line C in FIG. 4) to form a baseline.

The intersection of the extrapolation line of the linear part in the first half of the peak and the baseline is T5, the intersection of the extrapolation line of the linear part of the latter half of the peak with the baseline is T6, and the area of the part surrounded by the peak, extrapolation line, and baseline (shaded part) is is the heat of fusion H1. Similarly, the heat of fusion H2 at the second peak P2 is determined.

However, as shown in FIG. 5, the first peak P1
The end point T2 and the start point T3 of the second peak P2 overlap to form one point D, and if it deviates from the baseline C connecting T1 and T4, the intersection with the baseline C drawn perpendicularly from point D is set as T9. The area is determined by regarding the line connecting the second half (the first half of the peak in the case of the second peak P2) straight line portion and T9 as an extrapolation line.

Examples of the present invention will be described below.

〔Example〕

Example 1 Melt index (MI) 1.0 at 230°C, II 95
% polypropylene, MI 3.0, ethylene content
An ethylene-propylene block copolymer polymerized with 20% by weight and 80% by weight of propylene component so that the apex of the DSC melting peak was at three points of 124°C, 145°C, and 159°C was coextruded with a two-layer die. Wrap it around a cooling drum at ℃, form it into a sheet, and roll it vertically.
It was sequentially biaxially stretched 4.5 times at 130°C and 10 times in the transverse direction at 155°C, and heat set at 160°C.

Then, a corona discharge treatment was performed to obtain a film of 50 μm (polypropylene layer: 48 μm, copolymer layer: 2 μm). The wetting tension on the surface of this film is 36 on both sides.
dyne/cm, and the surface roughness Ra of the copolymer layer is
It had a diameter of 0.28 μm and had excellent erasing properties.

Approximately 400 Å of aluminum was deposited on the surface of the copolymer layer of this film using a vacuum deposition method, and gravure printing was performed on the opposite side (polypropylene layer).

Furthermore, an adhesive was applied to the aluminum vapor-deposited surface to create a nameplate with an eraser luster.

The nameplate created as described above was attached to the molded case (made of phenolic resin) of the electromagnetic contactor and left at 80℃ and 95%RH for 16 hours, but no swelling or peeling of the nameplate was observed. Ta.

Further, although the nameplate was pasted on the molded case and peeled off three times, no delamination phenomenon was observed in the vapor deposited layer or the like.

Comparative Example 1 The nameplate obtained in Example 1 was created with the vapor-deposited side and the printed side reversed (vapor-deposited side: polypropylene layer, printed side: ethylene-propylene copolymer layer).

A pasting test was conducted in the same manner as in Example 1.

Although no swelling or peeling was observed on the nameplate,
When the nameplate was peeled off, delamination occurred between the metal vapor deposited layer and the film.

Comparative Example 2 A nameplate was created in the same manner as in Example 1 using a 25 μm polyethylene terephthalate film.
When this nameplate was subjected to a pasting test in the same manner as in Example 1, swelling and peeling phenomena occurred.

Comparative Example 3 400 Å of aluminum was vacuum-deposited on one side of a 25 μm polyethylene terephthalate film, gravure printing was performed on the other side, and then aluminum was deposited on the other side.
A nameplate was created by laminating 20 g/m ² tissue paper and then applying adhesive on top of it.

When this nameplate was subjected to a pasting test in the same manner as in Example 1, swelling and peeling phenomena were observed in some parts.

Furthermore, when the nameplate was peeled off, delamination occurred in the paper part.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a breaker with a nameplate attached, Fig. 2 is an enlarged sectional view showing the first embodiment of the invention, Fig. 3 is an enlarged sectional view showing the second embodiment of the invention, and Fig. 4 is an enlarged sectional view showing the second embodiment of the invention. 5 and 5 are diagrams showing examples of melting curves of ethylene-propylene copolymers. 2... Nameplate, 3... Biaxially stretched polypropylene film, 4... Ethylene-propylene copolymer film, 5... Metal vapor deposition layer, 6... Adhesive layer, 7
...Polyethylene film, 8...Printing layer, P1
...melting peak on the low temperature side, P2...melting peak on the high temperature side, H1...heat of fusion of the melting peak on the low temperature side, H
2...Heat of fusion at the high temperature side melting peak.

Claims (1)

[Scope of utility model registration request] A biaxially stretched polypropylene film A, and an ethylene film laminated on at least one side of the film A.
It consists of a propylene copolymer film B or a polyethylene film C, and has a printing layer on the surface of the film A, and a metal vapor deposited layer with a thickness of 100 to 1000 Å is formed on the surface of the film B or film C, and the metal A nameplate for thermosetting resin molded products that is characterized by having an adhesive coated on the vapor deposited layer.