JPS60187673A - Manufacture of very thin vapor-deposited polyester film - Google Patents

Abstract

PURPOSE:To obtain a very thin vapor-deposited polyester film causing no breaking by successively laminating an oriented polyester film and a layer of a vapor- deposited metal on the surface of a polyolefin film as a support, slitting the resulting laminate, and continuously stripping the polyester film. CONSTITUTION:An oriented polyester film of 0.2-4.0mum thickness is closely laminated on at least one side of a polyolefin film as a support, and a metal such as Al is vapor-deposited on the polyester film to a prescribed thickness. The resulting laminate is slit to <=300mm. width of a film with a microslitter or the like so that the edges of the film have <=10mum unevenness, and the polyester film is continuously stripped from the support film. By this method a very thin vapor-deposited polyester film causing no breaking and suitable for use as a material for a capacitor is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention provides a method for manufacturing a film having a thickness of 0.2 to 4.0 μm and a wrinkle thickness of 0.
．． The present invention relates to a method for continuously and efficiently producing ultra-thin steamed bamboo polyester film having a thickness of 2 to 2.0 μm, more specifically, 0.2 to 1.0 μm. Such an ultra-thin vapor-deposited polyester film (J1) is particularly suitable for use in condensation.

[Prior art and its drawbacks]

A method of making an ultra-thin polyester film by peeling a polyester film from a laminated film formed by closely laminating a polyolefin film and a polyester film is described in Japanese Patent Application Laid-Open Nos. 58-5226, 58-136417, 57.
This is already known in Japanese Patent No. 176125 and the like. Also,
Japanese Unexamined Patent Publication No. 5 B-5226 also suggests a method in which a laminated film is vapor-deposited and then peeled off. However, in reality, an ultra-thin vapor-deposited polyester film is continuously peeled from a polyolefin support film.
When trying to obtain a long length of film, the film would easily break, making it difficult to make it into a real film.

[Purpose of the invention]

The object of the present invention is to provide a method that does not have the above-mentioned disadvantages, namely, to continuously peel an ultra-thin vapor-deposited polyester film from a poly-A lenoin support film without causing film breakage, and to provide an ultra-thin vapor-deposited polyester film that is free from the above drawbacks. The purpose of this article is to provide a method for producing polyester film.

(Structure of the Invention) In order to achieve the above object, the present invention has the following structure.
A vapor-deposited laminated film, in which an oriented polyester aluminum film with a thickness of 0.2 to 4.0 μm is closely laminated on one side, and a metal is deposited on the polyester film, is slitted. {The film is characterized by slitting it with a cutting device so that the film width is 300lTIm or less and the unevenness of the slit end surface is 10μ11 or less, and then the vapor-deposited polyester film is continuously peeled from the PolyA resin support film. This article outlines the method for producing ultra-thin vapor-deposited polyester film.

The vapor-deposited laminated film used in the present invention is a film in which a polyolefin and a polyolefin are adhered in an M layer, and a metal is vapor-deposited on the polyester. The laminated structure consists of three layers: poly-A renoin/polyester/vaporized metal layer.
A typical layer structure is a five-layer structure of vapor deposited metal layer/Vori 1 stell/Voriolefin/Vori 1 stell/vapor head metal layer, but it is not necessarily limited to these.

Such vapor-deposited laminated films are produced by coextruding polyA reflex and polyester to form a laminated unstretched film, which is stretched uniaxially or biaxially to give molecular orientation, and then heat treated to form an oriented laminated film. A common method is to make a polyester film and vaporize metal on the surface of this polyester film, but of course other methods may be used.

In the present invention, polyolefins include A-lefins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypylene, polybutene-1, poly-4-medylene-pentene-1, etc. It means a polymer, a copolymer, or a mixture thereof. Among these, particularly preferred for the present invention is a propylene-ethylene copolymer with a melting point of 100 to 140°C.
It consists of % and edge 1 non 2 to 20 times %,
Particularly desirable are those containing ethylene, which have a weight of 2.5 to 8.0 m
% of 1-copylene-1-tyrene random copolymer. This polymer may be a terpolymer in which a third copolymer component, such as butene-1, is further copolymerized within a range of 4K less than the ethylene-containing mold. This copolymer may also contain other poly-A reflexes, such as polyethylene and polybutene-1, within a range not exceeding 50% by weight.
may be mixed. In addition, in this copolymer,
Various known additives, such as antioxidants, antistatic agents,
A lubricant, a plasticizer, an anti-cocking agent, an ultraviolet absorber, or a pigment for neck color may be added. The polyolefin film used as the support may be oriented in the axial or biaxial direction, or may be a non-oriented film.

Next, polyester as used in the present invention refers to polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate 1-1, polyethylene bis(2-chlorophenoxy)ethane-4,4'-dicarboxylate, or cyclohexyl dimethanol. Polymers or copolymers having Esdel bonds as the main polymerization unit, such as condensation polymers of di7J carboxylic acid and di7J carboxylic acid, or copolymers or mixtures thereof. Among these, polyethylene terephthalate is particularly preferred in the present invention. Here, poly-1 ethylene terephthalate means 9 ethylene terephthalate units.
It accounts for 0 mol% or more. In other words,
Other molecular units such as ethylene isophthalate, butylene terephthalate, ethylene adipate, alkylene glycol, polyalkylene glycol, etc. may be copolymerized within a range not exceeding 10 mol %. This polyethylene terephthalate may contain known additives such as inorganic fine particles, coloring pigments, coloring inhibitors, and waxes. The polyester film constituting the present invention needs to have molecular orientation in one or two axes.

An unoriented polyester film is brittle, has poor continuous peeling, and has poor electrical properties. Furthermore, 0.2 to 1.0μ
There is a range of m suitable for the present invention. If it is thinner than this range, it will be difficult to continuously peel off -C using the method of the present invention. On the other hand, if the film is thicker than the upper 8d range, it is generally easy to peel it off continuously, so it is not necessary to use the method of the present invention.

The metal deposited on the polyester film is generally a low melting point metal such as aluminum, zinc, tin, or copper, but may also be a high melting point metal such as chrome, nickel, or titanium. As a deposition method, a known method such as a resistance heating deposition method, an electron beam heating deposition method, a sputtering method, or an ink-type ink method can be used.

The thickness of the metal film to be deposited is not particularly limited, but is usually O'. A range of 0.02 to 0.2 μm is preferred.

Now, in the following explanation, a brobylene-ethylene copolymer film (hereinafter referred to as PEC) with a melting point of 132°C will be used as a representative of polysubreflex film, and a polyethylene terephthalate film (hereinafter referred to as PEC) will be used as a representative of polyester film. This will be abbreviated as PET) and aluminum (hereinafter referred to as A [-]) as a representative of the vapor deposited metal layer, and a three-layer vapor deposited laminated film of PEC/PET/AL will be used as a representative example. From this film, the PET/A.L layer (Hfi layer) is continuously peeled off.
IIt! 1' is extremely difficult to remove, especially when the thickness of PET' is less than 1.0 μm, the film easily breaks and continuous peeling becomes impossible. The inventors have researched a method to facilitate this continuous peeling and have arrived at the present invention.One of the key points of the present invention is to change the width of the steamed laminated film before peeling. 300 m or less, preferably 200 mm or less, more preferably 100 mm or less, slit L-L, and then P.
ET,-'AL is to peel off the layer.

After narrowing the film width of the vapor-deposited laminated film with a slit in advance, one layer of PE King/At was peeled off to 11tll.
'tJ makes it difficult for the film to break and makes continuous peeling extremely easy. J5, the lower limit of the film width is not particularly limited, but if it is narrower than 5 mm,
This is not very desirable as the string will easily break <i>C1 for each person.

Another key point of the present invention is to reduce the unevenness of the slitted cut edge of the slit steamed top layer film to 1.
It is 0 μm or less, preferably 8 μm or less, more preferably 5 μm or less. If the unevenness of the edge of the film after being slipped becomes less than the above range, continuous peeling of the film becomes extremely difficult, and the film often breaks. Although there is no particular limit to the lower limit of the degree of unevenness, it is extremely difficult to make it 0.5 μm or less.

Slitting 1 - The method of keeping the unevenness of the edge of the cut film within a small range as described above is not particularly limited and may be performed by slitting using a well-known cutting device, but it is particularly preferable to use laser cutting. Slit J3 and addition 1 by light beam
Blade (Kinku, preferably a blade made of ceramics such as alumina ceramics, zirconia ceramics, silicon carbide ceramics, silicon nitride ceramics, etc.) The heating humidity is 100
= 300°C. Note that slitting with a particularly sharp shear cutter or slitting with a particularly sharp shear cutter may be used. In addition, film scraps whose unevenness is larger than the -V range can be heated with infrared rays or brought into contact with a heating roll, heating bar, etc. to reduce the u-C unevenness and keep it within the above range. Good too.

Now, in the present invention, an ultra-thin vapor-deposited polyester film is produced by continuously peeling off the PET/Yoshi-layer from the PEC layer as a support by the method described in -L. nip the phase with a nip roll, for example, a combination of a rubber coated roll and a metal coal, and remove the PE from the PEC layer at the nipped point.
If peeling is performed so that one layer of T/AI peels off, continuous peeling can be further facilitated. In other words, the starting point of σ8 for peeling between the PEC skin of the support film and the PET/Δ layer is placed at the nip part of the 1" block or immediately after the nip point (within 5 mm from the nip point). The PET/AL layer peeled off at the nip point of the nip roll is then run along the rolls on one side of the nip roll and then on the other roll.
J: Yes, if you transfer it to the loop or wind it directly. The winding tension of the PET/AL layer at this time is 3-30g.
It is preferable to keep it within the range of /(cm film width).

(Effect of Yoshimei] The present invention is "one), as it was" one), the M -A -piled layer film that is steamed by the polyester of the laminated film of the <Z -zed laminated film from Boli A Refin and Boli L Sedell, the film width after the film after the slit. 300mm or less, the unevenness of the slit end surface is 10μm
The method for manufacturing a super-deposited polyester film was made by slitting the polyester film as shown below, and then continuously peeling the vapor-deposited polyester film from the polyester resin support film to achieve good continuous peelability. , it is possible to obtain a sterile film with a very high thickness of vapor deposition without causing film breakage. In addition, since the peeled bamboo is J: thin, the resulting ultra-thin vapor-deposited polyester film has fewer insulation defects such as bottle balls, and is particularly suitable as a material for capacitors. You can wind up the obtained polar film to make a so-called wound capacitor, or you can stack many films and glue them together and cut out a capacitor from it to make a so-called laminated capacitor. can.

[Measurement and evaluation method]

1. Unevenness of the slit film edge The slit film edge was observed from directly above the film surface using an optical microscope with a magnification of 400 times. As unevenness on the film surface was observed, this was photographed and an additional 2.5 mm was added at the image printing stage.
Magnify x-C and measure the vertical distance in μm between the bottom of the deepest valley and the top of the highest mountain within a field of view.

This measurement is carried out over 30 fields of view on an arbitrary part of the film edge, and the vertical distance between the valley and the peak, which is calculated by 1q in each field, is summed, divided by 30 to obtain an average value, and this is used as the degree of unevenness.

2. Melting point of Volima Set 10 mg of Volima test t31 in the DSC,
Te of 0℃/min? The stomach was heated at a rate of temperature, and the humidity corresponding to the top of the endothermic peak accompanying melting was defined as the melting point.

J3, when two or more melting point peaks appeared, the temperature at the top of the height peak was taken as the melting point.

3. Evaluation method for continuous peelability: Set the slit vapor-deposited laminated film in an unwinding machine.
The film was run at a speed of L'U, 1011/min, and the vapor-deposited film layer was peeled off at a point in contact with one of the rolls, and the film was guided to another roll and wound up. In this test, the film that could be peeled off continuously for more than 500 m was rated as "best peeling", and the film that was cut over 100n+ in a length shorter than 500 m was rated as "1" peeling.
If the film is cut off at less than
Although it is practically necessary to have the best releasability, a normal level can be used depending on the application.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on Examples.

Example 1 <Production method of vapor-deposited laminated film> PEc (measured at 25°C in an orthochloric acid solution Saleta limit rL!1 degree 0.60) J5J: and PEc (melting point 1
30°C) pellets were fed in separate extrusions to 280°C.
Melt extrusion at °C, both melts were combined in Ll gold and molded with a die to form P E 'I-/r' E C
It was made into a sheet-like sheet consisting of three layers of /PET-. This was wound around a cooling drum with a surface temperature of 30°C and solidified by cooling to produce an unstretched laminated sheet.
The film was heated to 105°C, stretched 3.5 times in the width direction, once cooled, heated again to 105°C, stretched 5.0 times in the width direction, and then raised to 190°C. Then, it was heat treated for 5 seconds in a tensioned state, then slowly cooled, and then wound up while removing static electricity with a static eliminator.PET/P
A laminated film consisting of three layers of IEC/PE1 was obtained. The total thickness of this film was 15 .mu.InC, of which the thickness of each P-layer was 0.5 .mu.m. Is this laminated Noilum inside a resistance heating type fish neck machine? 0.06% aluminum on the PIE1 film surface.
Steamed to a thickness of 11 μm Δ:. Steamed? TV4W
The total width of J Finolem was 500 mm r:.

The evaporated top corner film obtained was 1:1
The film was slit to a width of 50 mm using a slitter. The slit is made by one ray of carbonic acid, and the uneven surface of the IC film is slit.
was set to 2 μ■. From this film, iWPE 'I-
Continuous peeling of the Noilum layer. Peeling over 500m (no film breakage occurred at all, "Peeling II")
II Bamboo Best”.

Example 2 Instead of slitting with the laser beam used in Example 1, a sharp ceramic blade was used to slit the film, and the unevenness of the slit film end face was set to 4 μm. This film also had the best peelability.

Comparative Example 1 The bust of Example 2 was changed only to the film width of 4. 50m
When the test was carried out under exactly the same conditions, the distance was 80 m.
! l. The film broke at the point where it was removed, resulting in "poor peelability".

Comparative Example 2 By changing the degree of sharpness of the ceramic blade in Example 2, the unevenness of the slit film edge was 12 μm.
I made a film of m. When the continuous releasability of this film was evaluated, film breakage occurred near 5OII1, and it was found to be "poor releasability."

Example 3 The vapor-deposited laminated film produced in Example 1 was
It was slit to 0 mm. The slitting was performed with a sharp <1 ceramic blade, and the unevenness of the slit film was set to 5 μm. This film is transferred to a pair of nibs 121- consisting of a combination of a metal roll and a rubber coated roll.
The vaporized@PET film was peeled off from the P[C film of the support at the nipped portion. The peeled vapor-deposited PET film was run along a metal roll, and the PEC film was run along a rubber gol on the opposite side, and each was guided to a separate winder and wound up. At this time, the winding tension of the vapor-deposited PE film was 6 g.
/(am frame width). The winding speed was 30 m/min from 10 m/min in the continuous peelability evaluation method described above.
Although continuous peeling was performed at a speed of 1000 m/min, the film did not break at all, and it was possible to continuously wind up the Kyokuden Neck PET film for more than 1000 m.

This ultra-thin vapor-deposited PEI film had few pinholes and was extremely excellent as a material for condensation.

Special κ′1 applicant Toray Industries, Inc. d

Claims (1)

[Claims] A support film made of polyester polyolefin is closely laminated with an oriented polyester film having a thickness of 0.2 to 4.0 μm, and the polyester film is A vaporized laminated film on which a metal is vapor-deposited <4 is slit with a sea urchin cutting machine so that the film width after slitting is 300 mm or less and the unevenness of the slit is 10 μm or less. A. Vapor deposition from lenoin support film]. Continuously separate the sudel fills
1. A method for producing an ultra-thin vapor-deposited polyester film, which is characterized in that it leaks.