Source: http://www.google.com/patents/US7429522?dq=6514640
Timestamp: 2017-12-16 06:22:44
Document Index: 603655872

Matched Legal Cases: ['Application No. 2003', 'Application No. 200410098297', 'Application No. 2003', 'Application No. 03023536', 'Application No. 2003', 'Application No. 2003', 'Application No. 2003', 'Application No. 2003', 'Application No. 200402611']

Patent US7429522 - Dicing die-bonding film - Google Patents
A dicing die-bonding film has a supporting substrate, an adhesive layer formed on the supporting substrate, and a die-bonding adhesive layer formed on the adhesive layer, and further has a mark for recognizing the position of the die-bonding adhesive layer. It is possible to provide a dicing die-bonding...http://www.google.com/patents/US7429522?utm_source=gb-gplus-sharePatent US7429522 - Dicing die-bonding film
Publication number US7429522 B2
Application number US 11/947,727
Also published as CN1638092A, CN100490119C, EP1548821A2, EP1548821A3, US7309925, US20050139973, US20080088036
Publication number 11947727, 947727, US 7429522 B2, US 7429522B2, US-B2-7429522, US7429522 B2, US7429522B2
Inventors Takeshi Matsumura, Masayuki Yamamoto
Patent Citations (71), Non-Patent Citations (16), Referenced by (27), Classifications (62), Legal Events (3)
US 7429522 B2
This application is a divisional application of U.S. patent application Ser. No. 11/012,998, filed Dec. 15, 2004, which claims priority to Japanese Patent Application No. 2003-431690, filed Dec. 26, 2003. This application also is related to U.S. patent application Ser. No. 10/678,855, filed Oct. 3, 2003, now issued U.S. Pat. No. 7,060,339; U.S. patent application Ser. No. 11/369,931, filed Mar. 7, 2006; U.S. patent application Ser. No. 10/849,414, filed May 19, 2004; U.S. patent application Ser. No. 11/671,982, filed Feb. 6, 2007; U.S. patent application Ser. No. 29/225,423, filed Mar. 16, 2005, now issued U.S. Pat. No. D549189; U.S. patent application Ser. No. 29/225,424, filed Mar. 16, 2005; and U.S. patent application Ser. No. 11/082,112, filed Mar. 16, 2005.
The pressure-sensitive adhesive layer (2) can be designed to have the portions (2 a and 2 b), which correspond to the work-attaching area (3 a) of the die-bonding adhesive layer (3) and the area (3 b) other than the area (3 a), in such a manner that the adhesive force of the pressure-sensitive adhesive layer portion (2 a) to the die-bonding is adhesive layer (3) is smaller than that of the pressure-sensitive adhesive layer portion (2 b) to the layer (3). In other words, the pressure-sensitive adhesive layer portion (2 b) bonds to the adhesive layer (3) to an appropriate extent at the time of dicing or expanding, so that the pressure-sensitive adhesive layer (2) is not peeled from the adhesive layer (3). On the other hand, the pressure-sensitive adhesive layer portion (2 a) makes easy peeling possible. Therefore, no dicing poorness is given to even a large-sized chip having a larger size than a size of 10 mm×10 mm. The obtained dicing die-bonding film is a dicing die-bonding film making it possible to easily peel and pick up the resultant chip-form work obtained after the dicing. As described above, the dicing die-bonding film (1) of the invention has a good balance between holding power at the time of dicing and other times and peelability at the time of picking-up.
The dicing die-bonding film of the present invention can be made into a structure having the pressure-sensitive adhesive layer (2) on the supporting substrate (1) and the die-bonding adhesive layer (3) which is peelable formed as the work-attaching area (3 a) on a portion of the pressure-sensitive adhesive layer (2). The pressure-sensitive adhesive layer (2) can be designed to have the portion (2 a) which corresponds to the work-attaching area (3 a) and the other portion (2 b) in such a manner that the adhesive force of the pressure-sensitive adhesive layer portion (2 a) is smaller than that of the pressure-sensitive adhesive layer portion (2 b). In other words, the pressure-sensitive adhesive layer portion (2 a) makes easy peeling possible. On the other hand, a wafer ring can be bonded to the pressure-sensitive adhesive layer portion (2 b). This can be fixed thereto so that this is not peeled at the time of dicing or expanding. Therefore, no dicing poorness is given to even a large-sized chip having a larger size than a size of 10 mm×10 mm. The obtained dicing die-bonding film is a dicing die-bonding film making it possible to easily peel and pick up the resultant chip-form work obtained after the dicing. As described above, the dicing die-bonding film of the invention has a good balance between holding power at the time of dicing and other times and peelability at the time of picking-up.
The die-bonding adhesive layer 3 can be formed from an ordinary die-bonding adhesive. The die-bonding adhesive is preferably a die-bonding adhesive which can be made into a sheet form. A specific example of the die-bonding adhesive is preferably a die-bonding adhesive made of a thermoplastic resin or a thermosetting resin. The die-bonding adhesive may be made of one or more selected from die-bonding adhesives. The die-bonding adhesive layer 3 is preferably a layer which can be stuck onto the semiconductor wafer 4 at 70° C. or lower, more preferably a layer which can be done at room temperature.
The marks 5 are position-recognizing points for deciding, when the semiconductor wafer 4 is attached and stuck onto the dicing die-bonding film 10, the position to which the wafer 4 is to be attached and stuck. In the present embodiment, the marks 5 are each made of a colored layer. The marks 5 are arranged on portions of the supporting substrate 1 from which the pressure-sensitive adhesive layer 2 and the die-bonding adhesive layer 3 are removed. This makes it possible that when the semiconductor wafer 4 is attached and stuck onto the dicing die-bonding film 10, the generation of a positional slippage thereof is prevented to improve the yield. In the present embodiment, the marks 5 are composed of marks 5 a (for example, a size of 5 mm×10 mm) and a mark 5 b (for example, a size of 5 mm×20 mm). The marks 5 a are arranged on line A-A passing through the central point of the die-bonding adhesive layer 3 (diameter: 210 mm) having a circular planar shape. In FIG. 1( a), the mark 5 b is arranged below the die-bonding adhesive layer 3. The shortest distances between the marks 5 a and the die-bonding adhesive layer 3 and between the mark 5 b and the layer 3 are 35 mm and 10 mm, respectively. The marks 5 are preferably arranged at positions of the dicing die-bonding film 10 which are not to be attached to a mount frame (not illustrated) for the following reason: mount frames are generally transparent; therefore, if the marks 5 are arranged at the position to which a mount frame is to be attached, the position is not easily detected. It is also preferable that the marks are arranged at positions of the dicing die-bonding film 10 remaining even after the mount frame, which is used in a mounting step, is formed. The planar shapes of the marks 5 are not particularly limited, and the sizes thereof are not particularly limited, as long as the marks make it possible that the positions thereof are recognized. The marks may be appropriately modified within the scope not departing from the claims.
In the present embodiment, the pressure-sensitive adhesive layer 2 can be designed to have portions 2 a and 2 b in such a manner that the peelability of the pressure-sensitive adhesive layer 2 from the die-bonding adhesive layer 3 satisfies the following relationship: the peelability of an interface (A) corresponding to a work-attaching area 3 a is larger than the peelability of an interface (B) corresponding to other area 3 b than the area 3 a (see FIG. 2). The pressure-sensitive adhesive layer portion 2 a corresponds to the work-attaching area 3 a of the die-bonding adhesive layer 3, and the pressure-sensitive adhesive layer portion 2 b corresponds to the area 3 b other than the area 3 a.
The pressure-sensitive adhesive layer 2 may be designed in such a manner that the peelability of an interface (B′) between a mount-frame-attaching area 3 b′ and an pressure-sensitive adhesive layer portion 2 b′ formed correspondingly to this area 3 b′ satisfies the following relationship: the peelability of the interface (A) is larger than the peelability of the interface (B′) (see FIG. 3). In the pressure-sensitive adhesive layer 2 illustrated in FIG. 2, the entire portion other than the pressure-sensitive adhesive layer portion 2 a constitutes the pressure-sensitive adhesive layer portion 2 b. However, in the case illustrated in FIG. 3, a part of area other than the pressure-sensitive adhesive layer portion 2 a may be made to the pressure-sensitive adhesive layer portion 2 b. The pressure-sensitive adhesive layer 2 may be designed to have 2 a and 2 b in such a manner that the adhesive force of a portion 2 a corresponding to the work-attaching area 3 a and that of other portion 2 b than the portion 2 a satisfy the following relationship: the adhesive force of the pressure-sensitive adhesive layer portion 2 a is smaller than that of the pressure-sensitive adhesive layer portion 2 b. The adhesive used to form the pressure-sensitive adhesive layer 2 illustrated in FIGS. 2 to 4 is not limited to any especial kind. The adhesive is preferably a radial ray curable adhesive capable of making a difference between the adhesive force of the pressure-sensitive adhesive layer portion 2 a and that of the pressure-sensitive adhesive layer portion 2 b easily. About the radial ray curable adhesive, the adhesive force thereof can easily be lowered by an increase in the crosslinking degree thereof by irradiation with radial rays such as ultraviolet rays. Accordingly, the adhesive force of the pressure-sensitive adhesive layer portion 2 a can easily be made remarkably lower by curing the radial ray curable adhesive layer in accordance with the work-attaching area 3 a. Since the adhesive layer 3 or 3 a is attached to the cured pressure-sensitive adhesive layer portion 2 a, the adhesive force of which is lowered, the interface between the pressure-sensitive adhesive layer portion 2 a and the adhesive layer area 3 a has a property that the portion 2 a and the area 3 a are easily peeled therein from each other when the semiconductor chip is picked up. On the other hand, the portion which is irradiated with no radial ray has a sufficient adhesive force, so as to constitute the pressure-sensitive adhesive layer portion 2 b.
In each of the dicing die-bonding films 6 and 7 illustrated FIGS. 2 and 3, the pressure-sensitive adhesive layer portion 2 b made of the non-cured radial ray curable adhesive is stuck onto the adhesive layer 3 so that the holding power necessary when the semiconductor wafer is diced can be kept. In such a way, radial ray curable adhesive can support the die-bonding adhesive layer 3 for sticking/fixing a chip-form work (a semiconductor chip or the like) onto a substrate, chip-form work, or some other object (referred to as an semiconductor element) with good balance between bonding and peeling. In a dicing die-bonding film 8 illustrated in FIG. 4, a pressure-sensitive adhesive layer portion 2 b makes it possible to fix a wafer ring and others. The pressure-sensitive adhesive layer 2 is formed to make the adhesive force of the pressure-sensitive adhesive layer portion 2 a smaller than that of the pressure-sensitive adhesive layer portion 2 b. In each of the dicing die-bonding films 6 and 7 illustrated FIGS. 2 and 3, the peelability of the interface (A) is made larger than that of the interface (B) regarding the adhesive force to the adhesive layer 3. In the dicing die-bonding film 8 as illustrated in FIG. 4, the adhesive force of the pressure-sensitive adhesive layer portion 2 a is made smaller than that of the pressure-sensitive adhesive layer portion 2 b in connection with, for example, a SUS 304 plate (#2000 polished) as an object to which a chip is to be stuck/fixed.
About the adhesive force of the pressure-sensitive adhesive layer 2 to the die-bonding adhesive layer 3 in each of the dicing die-bonding films 6 and 7 as illustrated in FIGS. 2 and 3, the adhesive force of the pressure-sensitive adhesive layer portion 2 a is designed to be smaller than that of the pressure-sensitive adhesive layer portion 2 b. The adhesive force (90° peeling value at a peeling speed of 300 mm/minute) of the pressure-sensitive adhesive layer portion 2 a at room temperature (23° C.) is preferably 0.5 N/20 mm or less, more preferably from 0.01 to 0.42 N/20 mm, even more preferably from 0.01 to 0.35 N/20 mm from the viewpoints of the fixing and holding power of the wafer, the collecting power of chips produced, and others. The adhesive force of the pressure-sensitive adhesive layer portion 2 b is preferably from about 0.5 to 20 N/20 mm. Even if the pressure-sensitive adhesive layer portion 2 a has a low peeling adhesive force, the generation of chip-scattering or the like can be suppressed by the adhesive force of the pressure-sensitive adhesive layer portion 2 b so that a sufficient holding force for wafer-processing can be exhibited.
In Embodiment 1, the case that colored layers made of ink or the like are used as the marks has been described. However, the present invention is not limited to this case.
The position where the marking adhesive film 21 is formed is on any portion of a pressure-sensitive adhesive layer 2 except the portion where a die-bonding adhesive layer 3 is formed, the rear face of a supporting substrate 1, or between the supporting substrate 1 and the pressure-sensitive adhesive layer 2. The planer shape thereof is a rectangle of 5 mm×10 mm size. However, the planer shape of the film 21 is not particularly limited. The size thereof is not particularly limited if the position thereof can be recognized.
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GB2340772A Title not available
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JP2003206468A Title not available
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JPH01268131A Title not available
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U.S. Classification 438/462, 438/458, 257/E21.596, 257/E21.525, 438/401, 257/E21.505, 257/E23.179, 438/113, 257/620, 257/E21.599, 438/114, 257/797, 438/110
International Classification H01L21/768, H01L21/44, H01L21/301, H01L21/58, C09J201/00, H01L21/46, H01L21/68, H01L21/78, H01L21/66, H01L21/52, C09J7/02, H01L23/544, H01L21/76
Cooperative Classification H01L2924/014, H01L2924/01033, H01L2924/01079, H01L2924/01016, H01L21/6836, H01L2924/01015, H01L2223/54453, H01L24/83, H01L2924/01005, H01L2223/5442, H01L2924/3025, H01L24/27, H01L2224/274, H01L2924/01027, H01L22/20, H01L23/544, H01L2224/8385, H01L2221/68327, H01L2224/83191, H01L2924/01082, H01L2924/01029, H01L2924/01047, H01L2924/01074, H01L2924/01013, H01L2924/07802, H01L2924/19043, H01L2924/01006, H01L2224/2919, H01L2924/0665, H01L2223/54426, H01L24/29
European Classification H01L21/683T2, H01L24/27, H01L22/20, H01L24/83, H01L23/544