JPH0713989B2 - Spacer tape and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a spacer tape, particularly a spacer tape useful for tape automated bonding used for resin sealing of electronic parts such as ICs and the like. The present invention relates to a manufacturing method thereof.

(Prior Art) Resin encapsulation of electronic parts such as ICs is performed by placing ICs on a tape for automated bonded bonding (hereinafter abbreviated as TAB) tape consisting of a heat-resistant resin film or a cross tape. The potting resin is coated on this, and this resin is cured by heating, but this resin is protected by avoiding contact with the IC, potting resin, lead wires, etc. on the TAB tape. In order to do embossing on both ends of the resin film in the longitudinal direction, or stack the TAB tape using a spacer tape that has holes at both ends of the resin film at equal intervals and pins are put out here, A TAB product in which a plurality of ICs, etc. are coated with potting resin at the same time, and the TAB tape and spacer tape are wound up in a reel shape and the resin is cured in a dryer. The method is carried out as to manufacture.

(Problems to be solved by the invention) However, when this spacer tape is used repeatedly, when the spacer tape is repeatedly deformed due to repeated stress changes and heating, the spacer tape is initially present. Since the electronic components such as ICs on the TAB tape that were normally held come into contact with each part due to the deformation of the spacer tape, the disadvantage of deforming the potting resin occurs, and the TAB tape is also stressed. There is a drawback that troubles occur, and this also has the problem that the gas generated when the potting resin is cured causes the electronic components mounted on the TAB tape to be discolored. .

(Means for Solving the Problems) The present invention relates to a spacer tape which can solve such disadvantages, and it is a strip-shaped upper and lower surfaces of both ends of a continuous heat-resistant resin film or cloth tape in the longitudinal direction. The silicone rubber of the present invention is laminated on the upper surface and / or the lower surface of the silicone rubber, and preferably a convex portion or a concave portion is formed substantially at right angles to the longitudinal direction. It is characterized by:

That is, the present inventors have variously studied the acquisition of a spacer tape that is not deformed even by repeated use, and as a spacer tape used for laminating a TAB tape, silicone rubber is used in the longitudinal direction of a heat-resistant resin film or a cloth tape. Silicone rubber has excellent heat resistance and cold resistance if it is used by bonding the upper and lower surfaces of both ends in a strip shape, so even if it is heated repeatedly at about 150 ° C to cure the potting resin, this will deteriorate. Silicone rubber does not deform even after long-term use because silicone rubber has excellent compression set characteristics.Since the silicone rubber has flexibility, it can be wound into a reel and is resistant to chemicals. Since it has excellent properties, the reliability of TAB manufacturing is improved when it is used as a spacer in TAB manufacturing. When the potting resin is cured, the band-shaped silicone rubber used here has a convex portion or a concave portion formed on its upper surface and / or lower surface, preferably substantially at right angles to its longitudinal direction. It is confirmed that the generated gas can be discharged to the outside of the system through the gap formed by this uneven portion, so that it is possible to prevent accidents such as discoloration of electronic parts, and the structure of this spacer tape and its manufacturing method. To complete the present invention.

This will be described in more detail below.

(Operation) The spacer tape of the present invention relates to a spacer tape for TAB, which is formed by bonding band-shaped silicone rubber to the upper and lower surfaces of both ends of a heat-resistant resin film or cloth tape in the longitudinal direction.

The film or tape which is the base material of the spacer tape of the present invention is used for transporting the TAB tape and curing the potting resin, and therefore, for sealing the electronic components such as IC on the TAB tape. Can withstand repeated curing conditions such as curing temperature and time of potting resin used, and vulcanization conditions (temperature,
Films made from heat-resistant resins such as polyimide, polyetherimide, polyethersulfone, polyetheretherketone, polysulfone, glass cloth tape, etc., because they are required to withstand time) Or tape. Also, the film tape as the base material has a width of 35 to 70 mm and a thickness of 50 because it is used for transporting TAB tape.
˜250 μm, and the length may normally be several tens to 300 m.

The spacer tape of the present invention is a film as the base material,
A strip of silicone rubber is attached to the upper and lower surfaces of both ends of the tape in the longitudinal direction. And R is an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, an alkenyl group such as a vinyl group or an allyl group, an aryl group such as a phenyl group or a tolyl group, or a group bonded to this carbon atom. With the same or different carbon atoms selected from halogen atoms, chloromethyl groups in which some or all of the hydrogen atoms are substituted with cyano groups, 3,3,3-tolufluoropropyl groups, cyanoethyl groups, etc.
.About.10, preferably an unsubstituted or substituted monovalent hydrocarbon group having 1 to 8 carbon atoms, consisting essentially of a linear diorganopolysiloxane in which a is a positive number from 1.98 to 2.05 at 25.degree. Uses a silicone rubber compound that has a practical strength by using diorganopolysiloxane raw rubber with a measured viscosity of 1,000,000 cS or more as the base polymer and adding fumed silica, hydrous silica, etc. as a reinforcing material filler to this However, it is preferable that the organic group of the diorganopolysiloxane contains an alkenyl group such as a vinyl group necessary for crosslinking.

Also, this silicone rubber compound is made into a band-shaped tape by extrusion molding or the like, and it is attached to both ends of the above-mentioned film tape for TAB tape transportation, but since this one must be vulcanized and cured, Examples of vulcanizing agents include benzoyl peroxide, monochlorobenzoyl peroxide, p-methylbenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butyl perbenzoate, dicumyl peroxide and 2,5-bis-. (T-Butylperoxy) -2.5-dimethylhexane, 2,5-bis (t-butylperoxy)
Dicarbonates such as -2,5-dimethylhexyne, dimyristyl peroxycarbonate and dicyclododecyl peroxydicarbonate, t-butyl monoperoxycarbonates, the following formula (However, in the formula, R ¹ is a monovalent hydrocarbon group having 3 to 10 carbon atoms.) 1 of low-temperature decomposable organic peroxides such as compounds represented by
One or two or more kinds are usually added in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the above-mentioned diorganopolysiloxane, or the above diorganopolysiloxane contains an alkenyl group such as a vinyl group in the molecule. In this case, as a curing agent, an organohydrogenpolysiloxane having at least two hydrogen atoms (≡SiH) bonded to a silicon atom in the molecule and platinum or a platinum compound as a curing catalyst are added. The composition may be allowed to crosslink in an addition reaction.

Examples of the organohydrogen polysiloxane include those represented by the general formula (In the formula, R ² is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms similar to R described above, b and C are respectively positive numbers, and b + C is 1.0 to 3.0) An organohydrogenpolysiloxane having at least two silicon-hydrogen bonds in the molecule represented by (R ² is an alkyl group such as a methyl group, an ethyl group, a propyl group or a butyl group, an aryl group such as a phenyl group or a tolyl group) Group or a 3,3,3-trifluoropropyl group is preferable).
The organohydrogenpolysiloxane as the curing agent for the addition reaction contains at least two silicon-hydrogen bonds (≡Si-H) that react with the alkenyl groups in the above-mentioned diorganopolysiloxane as the base polymer. However, the degree of polymerization is preferably 300 or less.
Further, it may have any of the conventionally known linear structure, cyclic structure and branched chain structure, and the addition amount thereof is based on the alkenyl group amount (mol number) in the diorganopolysiloxane. The ≡Si-H bond is 50 to 300 in molar number.
The amount may be in the range of%.

As the curing catalyst, for example, platinum black, alumina,
Solid platinum supported on a carrier such as silica, chloroplatinic acid, a complex of chloroplatinic acid and an olefin or vinyl siloxane, a catalyst for the addition reaction of platinum or a platinum-based compound exemplified by an alcohol solution of chloroplatinic acid. The addition amount may be 0.5 to 500 ppm, preferably 2 to 200 ppm, based on the total amount of the diorganopolysiloxane and the organohydrogenpolysiloxane.

This spacer tape is taken up together with the TAB tape when coating potting resin on electronic parts such as ICs, and then rewound for reuse. At this time, observe a charge of several thousand volts. As a countermeasure against this static electricity, carbon black, various metal powders, metal oxides, and other conductivity-imparting agents are usually added to electrically insulating silicone rubber with a volume resistivity (ρ) of 10 ¹⁴ Ω · cm or more. Then, the volume resistivity thereof is lowered to 10 ¹ to 10 ¹⁰ Ω · cm, and the conductive composition is preferably prepared.

The production of the spacer tape of the present invention using this silicone rubber compound is carried out by accommodating the above-mentioned heat-resistant resin film or cloth tape with the head of the extruder while applying the above-mentioned unvulcanized silicone rubber compound to both ends of the film or cloth tape. Width about 5mm, height about 1 on the top and bottom of the part
It can be extruded into a strip of ~ 2 mm and then passed through a hot air oven to vulcanize this silicone rubber for hot air vulcanization. In this case, it is necessary to bond the silicone rubber to the film or cloth tape, but it is difficult to bond the silicone rubber to other substances. It is necessary to apply it beforehand or add an adhesiveness-imparting agent to the unvulcanized silicone rubber. In addition, this spacer tape is manufactured by extruding only a silicone rubber compound into a band with a predetermined size using an extruder, vulcanizing it, and then curing it at room temperature on the upper and lower surfaces of both ends of a heat-resistant resin film or cloth tape. You may make it adhere | attach by sticking the liquid silicone rubber composition etc. which have a property as an adhesive agent.

The strip-shaped silicone rubber is provided with a convex portion or a concave portion on its surface, preferably at a right angle to the longitudinal direction, in order to discharge the gas generated when the potting resin is cured as described above. The protrusions or depressions may be formed by attaching a band-shaped silicone rubber to the heat-resistant resin film and then forming the protrusions or depressions when the silicone rubber is unvulcanized. After providing the convex portion or the concave portion sandwiching the roller, the curing may be performed as described above. Next, this will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of the spacer tape of the present invention, and FIG. 2 is a longitudinal sectional view thereof. FIG. 1 (a) is a heat-resistant resin film 1 having a flat belt-shaped silicone rubber 2 bonded to the upper and lower surfaces of both end portions in the longitudinal direction, and FIG. FIG. 2 (a) illustrates an example in which the recesses 3 formed at right angles are bonded together.
Is A of the spacer tape of the present invention shown in FIG.
2B is a longitudinal sectional view taken along line A, and FIG. 2B to FIG.
(B) is a vertical cross-sectional view taken along line BB of the one having a convex portion or a concave portion shown in FIG. (C) is one in which a concave portion is formed on the upper surface of the band-shaped silicone rubber 2 and the flat band-shaped silicone rubber is bonded on the upper surface of the heat-resistant resin film 1 and on the lower surface.
(D) is a band-shaped silicone rubber having a convex portion provided on the upper surface and is bonded to the upper and lower surfaces of a heat-resistant resin film,
(E) is a flat plate-shaped belt-shaped silicone rubber on the lower surface in FIG.

Further, FIG. 3 shows a TAB manufacturing process using the spacer tape of the present invention, FIG. 3 (a) uses the spacer tape shown in FIG. 1 (a), and FIG. ) Is a vertical cross-sectional view of the one using the spacer tape shown in FIG. 1 (b). According to this, since the silicone rubber has excellent heat resistance and compression set characteristics, the TAB tape is shown. For transporting and curing potting resin 1
Since the silicone rubber does not deform even when heated to 50 ° C or higher, this spacer tape has the advantage that it can be used for a long period of time. However, since the gas generated during the curing of the potting resin is easily removed to the outside of the system, it is possible to prevent the disadvantage that the target electronic component is discolored by this gas.

(Examples) Next, examples of the present invention will be given. In the examples, parts are parts by weight.

Example 1 Silicone rubber compound KE164U [trade name of Shin-Etsu Chemical Co., Ltd.] 100 parts, acetylene black [trade name of Denki Kagaku Co., Ltd.] 18 parts, methylhydrogen polysiloxane 1.4 parts, chloroplatinic acid 0.1 % Unisolated silicone rubber compound was prepared by kneading with a two-roll mill to which 1.0 part of an isopropanol solution was added.

On the other hand, as a heat-resistant resin film, width 35 mm, thickness 125 μm
Prepare a 100 m roll of polyimide film apical [trade name of Kanegafuchi Chemical Industry Co., Ltd.], and apply a 5 mm width primer on both upper and lower sides of its longitudinal direction. X-65-196 [Shin-Etsu Chemical Co., Ltd. ) Product name] was applied.

Then, insert this primer-treated film into the upper nipple holder of a crosshead type 40mmφ extruder, and extrude the above silicone rubber compound with it about 5mm wide and 2mm high. After bonding it to the upper and lower surfaces of both ends of the film in the longitudinal direction, 170 ℃
It is vulcanized by passing a linear velocity of 1 m / min through a hot-air furnace having a total length of 1 m held in the above, and wound on a take-up winder in a reel shape, as shown in FIG. A spacer tape as shown in FIG. 2 (a) was manufactured.

The physical properties of the silicone rubber 2 vulcanized under the above conditions are hardness (JI
S) 60, tensile strength 60kg / cm ² , elongation 400%, volume resistivity 1
× is 10 ¹⁵ Ω · cm, the silicone rubber was sufficiently well bonded to the film.

Next, this spacer tape was wound together with a TAB tape and resin-encapsulated for carrying electronic parts, coating this electronic part with potting resin, and repeatedly using it for curing the resin. There were no abnormalities such as deterioration, deformation and peeling of the cloth tape and silicone rubber, and no electrification was observed when the spacer tape and TAB tape were unwound.

Example 2 100 parts of silicone rubber compound KE164U [trade name of Shin-Etsu Chemical Co., Ltd.], 18 parts of acetylene black [trade name of Denki Kagaku Co., Ltd.], 1.4 parts of methylhydrogen polysiloxane, chloroplatinic acid An unvulcanized silicone rubber compound was prepared by kneading with a two-roll mill, to which 1.0 part of an isopropanol solution containing 0.1% was added.

On the other hand, as a heat-resistant resin film, width 35 mm, thickness 125 μm
Prepare a 300 m roll of polyimide film apical [trade name of Kanegafuchi Chemical Industry Co., Ltd.], and apply a 5 mm wide primer on both upper and lower sides of its longitudinal direction X-65-196 [Shin-Etsu Chemical Co., Ltd. ) Product name] was applied.

Then, insert this primer-treated film into the upper nipple holder of a crosshead type 40mmφ extruder, and with it, extrude the above silicone rubber compound with a width of about 5mm and a height of about 1.5mm on each of the upper and lower surfaces. After molding and adhering this to the upper and lower surfaces of both ends in the longitudinal direction of the film, it is sandwiched in a roller having a convex portion in the longitudinal direction in an unvulcanized state and rotated to provide a concave portion in the unvulcanized silicone rubber, Then put this in a hot air furnace with a total length of 1 m for 200
It is vulcanized by passing a linear speed of 1.5 m / min at ℃ and wound on a take-up winder in a reel shape to give a second cross section.
A spacer tape having a shape as shown in FIG.

Next, this spacer tape was wound up together with the TAB tape to transport the electronic parts to prevent resin, covering the electronic parts with potting resin, and repeatedly used for curing the resin. 7
Deterioration or deformation of the rubber or cloth tape and silicone rubber,
There are no abnormalities such as peeling, and the spacer tape and TA
No charge was observed when the tape was unwound, and when this was used, the gas generated when the potting resin was cured was externally cured by removal from the recess provided in the silicone rubber. By doing so, we were able to prevent the accident of discoloration of electronic parts.

(Effects of the Invention) The present invention relates to a spacer tape, particularly to a spacer tape that is useful for carrying a TAB tape and curing a potting resin, which is a continuous heat-resistant resin film or cloth tape as described above. A belt-shaped silicone rubber laminated on the upper and lower surfaces of both ends in the longitudinal direction.
Alternatively, the lower surface is provided with a convex portion or a concave portion substantially at right angles to the longitudinal direction. According to this, even when this is used for transporting a TAB tape and curing a potting resin, 1 ) Silicone rubber is heat resistant,
Since it has excellent cold resistance, it will not deform even if it is repeatedly used at a temperature of 150 ° C or higher due to hardening of the potting resin. 2) Silicone rubber has excellent compression set characteristics, so it will be used for a long time 3) Silicone rubber tape has flexibility, so it can be wound into a reel and has excellent chemical resistance, so the reliability of TAB products obtained by this method is improved. If this silicone rubber is made conductive by adding a conductivity-imparting agent to make it have a volume resistivity of 10 ¹⁰ to 10 ¹⁰ Ω · cm, electrostatic damage that occurs during tape rewinding in the TAB process is given. It is also possible to prevent the occurrence of the above, and if the band-shaped silicone rubber has a convex portion or a concave portion as described above, it can be used for sealing electronic parts. Since the gas generated when the coating resin is cured can be effectively removed from the convex portion or the concave portion to the outside, the disadvantage that the electronic component is colored by this gas can be completely prevented. Is given.

[Brief description of drawings]

FIG. 1 is a perspective view of a spacer tape according to the present invention. FIG. 1 (a) shows a flat belt-shaped silicone rubber used, and FIG. 1 (b) shows a belt-shaped silicone having a recess 3 formed on its upper surface. The one used, FIG. 2 shows this vertical cross-sectional view, and FIG. 2 (a) shows the spacer tape A of FIG. 1 (a).
2B is a longitudinal sectional view taken along line A, and FIG. 2B to FIG.
BB line longitudinal sectional views of various shapes of the spacer tape of FIG.
The figure shows a vertical cross-sectional view of the TAB manufacturing process using the spacer tape of the present invention, and FIG. 3 (a) is the one using the spacer tape shown in FIG. 1 (a), FIG. b) uses the spacer tape shown in FIG. 1 (b). 1 ... Heat-resistant resin film 2 ... Silicone rubber 3 ... Recessed or convex

Claims (5)

[Claims] 1. A spacer tape comprising a heat-resistant resin film or a cloth tape, and a band-shaped silicone rubber bonded to the upper and lower surfaces of both ends in the longitudinal direction. 2. A belt-shaped silicone rubber has an upper surface and / or
Alternatively, the spacer tape according to claim 1, wherein the lower surface has a convex portion or a concave portion. 3. An extruding machine is used to extrude a heat-resistant resin film or cloth tape and an unvulcanized silicone rubber together, and the extruded silicone rubber is vulcanized with hot air. A method for manufacturing a spacer tape according to item 1. 4. The method for producing a spacer tape according to claim 1, wherein a vulcanized molded product of silicone rubber is bonded to a heat-resistant resin film or cloth tape with an adhesive. 5. The method for producing a spacer tape according to claim 3, wherein a primer is applied to the heat-resistant resin film or cloth tape, or an adhesive aid is added to the silicone rubber to adhere the silicone rubber to the film or tape.