Source: http://www.google.com/patents/US7646103?dq=4393663
Timestamp: 2017-05-22 17:47:23
Document Index: 39248512

Matched Legal Cases: ['Application No. 2002', 'Application No. 200410098297', 'Application No. 2003', 'Application No. 03023536', 'Application No. 05', 'Application No. 05005884', 'Application No. 2003', 'Application No. 2003', 'Application No. 2003', 'Application No. 2003', 'Application No. 200402611']

Patent US7646103 - Dicing/die-bonding film, method of fixing chipped work and semiconductor device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA dicing/die-bonding film including a pressure-sensitive adhesive layer (2) on a supporting base material (1) and a die-bonding adhesive layer (3) on the pressure-sensitive adhesive layer (2), wherein a releasability in an interface between the pressure-sensitive adhesive layer (2) and the die-bonding...http://www.google.com/patents/US7646103?utm_source=gb-gplus-sharePatent US7646103 - Dicing/die-bonding film, method of fixing chipped work and semiconductor deviceAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7646103 B2Publication typeGrantApplication numberUS 11/369,931Publication dateJan 12, 2010Filing dateMar 7, 2006Priority dateOct 15, 2002Fee statusPaidAlso published asCN1497703A, CN100358126C, EP1411547A2, EP1411547A3, US7060339, US8178420, US8586415, US20050046042, US20060148131, US20100093155, US20120088333Publication number11369931, 369931, US 7646103 B2, US 7646103B2, US-B2-7646103, US7646103 B2, US7646103B2InventorsTakeshi Matsumura, Masaki MizutaniOriginal AssigneeNitto Denko CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (93), Non-Patent Citations (25), Referenced by (11), Classifications (46), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetDicing/die-bonding film, method of fixing chipped work and semiconductor device
US 7646103 B2Abstract
A dicing/die-bonding film including a pressure-sensitive adhesive layer (2) on a supporting base material (1) and a die-bonding adhesive layer (3) on the pressure-sensitive adhesive layer (2), wherein a releasability in an interface between the pressure-sensitive adhesive layer (2) and the die-bonding adhesive layer (3) is different between an interface (A) corresponding to a work-attaching region (3 a) in the die-bonding adhesive layer (3) and an interface (B) corresponding to a part or a whole of the other region (3 b), and the releasability of the interface (A) is higher than the releasability of the interface (B). The dicing/die-bonding film is excellent in balance between retention in dicing a work and releasability in releasing its diced chipped work together with the die-bonding adhesive layer.
This is a divisional application of U.S. patent application Ser. No. 10/678,855, field Oct. 3, 2003 now U.S. Pat. No. 7,060,339, which claims priority to Japanese Patent Application No. 2002-299930, filed Oct. 15, 2002, and the disclosure of which is herein incorporated by reference in its entirety.
By this method, however, there are the cases where the adhesive layer achieving retention for the dicing step and releasability for a subsequent step in good balance is hardly formed. For example, when a large chipped work of 10 mm×10 mm or more is to be obtained, its area is so great that the chipped work cannot be easily picked up with a general die bonder.
An object of the present invention is to provide a dicing/die-bonding film comprising a pressure-sensitive adhesive layer on a supporting base material and a die-bonding adhesive layer arranged in a releasable manner on the pressure-sensitive adhesive layer, which is excellent in balance between retention in dicing a work and releasability in releasing its diced chipped work together with the die-bonding adhesive layer.
The dicing/die-bonding film (1) of this invention comprises a pressure-sensitive adhesive layer (2) on a supporting base material (1) and a die-bonding adhesive layer (3) in a releasable manner on the pressure-sensitive adhesive layer (2). In the pressure-sensitive adhesive layer (2), the adhesion of regions (2 a, 2 b) corresponding to the work-attaching region (3 a) and the other region (3 b) respectively in the die-bonding adhesive layer (3) is designed such that the adhesion of the pressure-sensitive adhesive layer (2 a) is lower than the adhesion of the pressure-sensitive adhesive layer (2 b). That is, the pressure-sensitive adhesive layer (2 b) adheres suitably to the adhesive layer (3) during dicing step or expanding step, to prevent the adhesive layer (3) from being released from the pressure-sensitive adhesive layer (2). On the other hand, the pressure-sensitive adhesive layer (2 a) can be easily released. Accordingly, a dicing/die-bonding film capable of easy release and pickup of a large chip of 10 mm×10 mm or more obtained as diced chipped work without inferior dicing can be obtained. Thus, the dicing/die-bonding film (1) according to this invention well balances retention during dicing step and releasability during pickup step.
The dicing/die-bonding film (2) of this invention comprises a pressure-sensitive adhesive layer (2) on a supporting base material (1) and a die-bonding adhesive layer (3) arranged as a work-attaching region (3 a) in a releasable manner on a part of the pressure-sensitive adhesive layer (2). The pressure-sensitive adhesive layer (2) is designed such that the adhesion of the region (2 a) corresponding to the work-attaching region (3 a) and the adhesion of the other region (2 b) satisfy the relationship: the adhesion of the pressure-sensitive adhesive layer (2 a) is lower than the adhesion of the pressure-sensitive adhesive layer (2 b). That is, the pressure-sensitive adhesive layer (2 a) can be easily released. On the other hand, a wafer ring can be stuck on the pressure-sensitive adhesive layer (2 b) and fixed such that it is not released during dicing step and expanding step. Accordingly, a dicing/die-bonding film capable of easy release and pickup of a large chip of 10 mm×10 mm or more obtained as diced chipped work without inferior dicing can be obtained. Thus, the dicing/die-bonding film (2) according to this invention well balances retention during dicing step and releasability during pickup step.
FIG. 1 is an example of a sectional view of the dicing/die-bonding film (1) of the present invention.
Hereinafter, the dicing/die-bonding film of the present invention is described by reference to the drawings. FIGS. 1 and 2 are sectional views of the dicing/die-bonding film (1) of this invention that comprises a pressure-sensitive adhesive layer (2) on a supporting base material (1) and a die-bonding adhesive layer (3) on the pressure-sensitive adhesive layer (2).
The die-bonding adhesive layer (3) can be formed from a usual die adhesive. The die adhesive is preferably an adhesive that can be formed into a sheet. Preferable examples of the die adhesive include die adhesives made of thermoplastic or thermosetting resins. The die adhesives can be used alone or more in combination thereof. The die-bonding adhesive layer is preferably a layer that can stick to a work such as a semiconductor wafer or to a dicing ring at 70° C. or less. The die-bonding adhesive layer is more preferably a layer that can stick at ordinary temperatures.
In the dicing/die-bonding film (1), the adhesion of the pressure-sensitive adhesive layer (2) to the die-bonding adhesive layer (3) is designed such that the adhesion of the pressure-sensitive adhesive layer (2 a) is lower than the adhesion of the pressure-sensitive adhesive layer (2 b). On the basis of the adhesion (90° peel value, peel rate 300 mm/min.) at ordinary temperature (23° C.), the adhesion of the pressure-sensitive adhesive layer (2 a) is preferably not higher than 0.5 N/20 mm, more preferably 0.01 to 0.42 N/20 mm, still more preferably 0.01 to 0.35 N/20 mm from the viewpoint of retention of a wafer or recovery of formed chips. On the other hand, the adhesion of the pressure-sensitive adhesive layer (2 b) is preferably about 0.5 to 20 N/20 mm. Even if the pressure-sensitive adhesive layer (2 a) has low peel adhesion, the adhesion of the pressure-sensitive adhesive layer (2 b) can prevent chips from being scattered, and can demonstrate sufficient retention for processing of wafers.
Hereinafter, this invention is described in more detail by reference to the Examples. In the following description, “parts” refers to parts by weight. For irradiation with ultraviolet rays, an ultraviolet (UV) irradiation unit (NEL UM-110 (Nitto Seiki Co., Ltd.) was used.
Preparation of a Die-Bonding Adhesive Layer
The components shown in Table 1 below, that is, epoxy resin, phenol resin, acrylic rubber, silica and a curing accelerator were compounded in the ratios shown in the table to prepare compositions for die-bonding adhesives (A) to (C), and each composition was mixed with and dissolved in toluene. The mixed solution was applied onto a polyester film (separator) treated with a releasing agent. Then, the polyester film coated with the mixed solution was dried at 120° C. to remove the toluene, whereby each of the die-bonding adhesive layers A to C of 20 μm in thickness in the B-stage on the polyester film were obtained.
<Epoxy resin (a1)> is bisphenol A type epoxy resin (epoxy equivalent, 186 g/eq.; viscosity, 10 Pa·s/25° C.), <Epoxy resin (a2)> is triphenol methane type epoxy resin (epoxy equivalent, 170 g/eq.; softening point, 80° C.; viscosity, 0.08 Pa·s/150° C.), <Phenol resin> is novolak type phenol resin (hydroxyl group equivalent, 104 g/eq.; softening point, 80° C.; viscosity, 0.1 Pa·s/150° C.), <Acrylic rubber> (Mooney viscosity: 50), <Spherical silica> Average particle diameter, 1 μm; maximum particle diameter, 10 μm, and <Curing accelerator> is triphenylphosphine. Example 1
(Preparation of a Radiation-Curing Acrylic Pressure-Sensitive Adhesive)
A dicing/die-bonding film was prepared in the same manner as in Example 1 except that the die-bonding adhesive (B) was used in place of the die-bonding adhesive (A) in Example 1.
A dicing/die-bonding film was prepared in the same manner as in Example 3 except that the die-bonding adhesive layer (C) was used in place of the die-bonding adhesive (B) in Example 3.
A dicing/die-bonding film was prepared in the same manner as in Example 3 except that the die-bonding adhesive layer (A) was used in place of the die-bonding adhesive (B) in Example 3.
Only a wafer-attaching region of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive film (A) obtained in Example 1 was irradiated with UV rays in a total dose of 500 mJ/cm2 to give a film having the pressure-sensitive adhesive layer whose wafer-attaching region had been cured by UV rays. Then, the above die-bonding adhesive layer (A) was transferred onto the wafer-attaching region of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive film (A), to give a dicing/die-bonding film.
Only a wafer-attaching region of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive film (B) obtained in Example 3 was irradiated with UV rays in a total dose of 500 mJ/cm2 to give a film having the pressure-sensitive adhesive layer whose wafer-attaching region had been cured by UV rays. Then, the above die-bonding adhesive layer (C) was transferred onto the wafer-attaching region of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive film (B), to give a dicing/die-bonding film.
A dicing/die-bonding film was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive layer in the pressure-sensitive adhesive film (A) was not irradiated with UV rays.
A dicing/die-bonding film was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive layer on the t pressure-sensitive adhesive film (A) was not irradiated with UV rays, and also that the die-bonding adhesive layer (A) after being transferred onto the pressure-sensitive adhesive layer was irradiated with 500 mJ/cm2 UV rays.
The pressure-sensitive adhesive film used in each example was irradiated in the side of the supporting base material with UV rays (500 mJ/cm2) and cut into rectangular strips of 10 mm in width. Separately, the die-bonding adhesive layer used in each example was stuck onto a 6-inch silicon wafer (ground surface #2000) placed on a hot plate at 40° C. Thereafter, the pressure-sensitive adhesive film (10 mm in width) was stuck onto the die-bonding adhesive layer at room temperature (23° C.) and left for 30 minutes in a room-temperature atmosphere, and the adhesion of the pressure-sensitive adhesive film when peeled off at a peel angle of 90° in a thermostat chamber at 23° C. was measured (stress rate of the pressure-sensitive adhesive film, 300 mm/min.). However, the pressure-sensitive adhesive film used in Comparative Example 1 was measured for adhesion without irradiation with UV rays. The pressure-sensitive adhesive film used in Comparative Example 2 was irradiated with UV rays after attachment to the die-bonding adhesive layer.
The pressure-sensitive adhesive film used in each of the Examples and Comparative Examples was cut into rectangular strips of 10 mm in width. Separately, the die-bonding adhesive layer used in each of the Example and Comparative Examples was stuck onto a 6-inch silicon wafer (ground surface #2000) placed on a hot plate at 40° C. Thereafter, the pressure-sensitive adhesive film (10 mm in width) was stuck onto the die-bonding adhesive layer at room temperature (23° C.) and left for 30 minutes in a room-temperature atmosphere, and the adhesion of the pressure-sensitive adhesive film when peeled off at a peel angle of 90° in a thermostat chamber at 23° C. was measured (stress rate of the pressure-sensitive adhesive film, 300 mm/min.).
The region, on which a wafer was not stuck, of the dicing/die-bonding film obtained in each of the Examples and Comparative Examples was irradiated in the side of the supporting base material with UV rays (500 mJ/cm2) and then cut into rectangular strips of 10 mm in width. The dicing/die-bonding film (10 mm in width) was stuck onto a dicing ring (2-6-1 (Disco)) and a wafer (ground surface #2000) at 23° C. (room temperature) and then left in a room-temperature atmosphere for 30 minutes, and the adhesion of the pressure-sensitive adhesive film when peeled off at a peel angle of 90° in a thermostat chamber at 23° C. was measured (stress rate of the dicing/die-bonding film, 300 mm/min.).
Each of the pressure-sensitive adhesive films A and B was irradiated in the side of the supporting base material with UV rays (500 mJ/cm2) and then cut into rectangular strips of 10 mm in width. Thereafter, the pressure-sensitive adhesive film (100 mm width) was stuck onto an SUS304 plate (#2000 polishing) at room temperature (23° C.) and left for 30 minutes in a room-temperature atmosphere, and the adhesion of the pressure-sensitive adhesive film when peeled off at a peel angle of 90° in a thermostat chamber at 23° C. was measured (stress rate of the pressure-sensitive adhesive film, 300 mm/min.).
Each of the pressure-sensitive adhesive films A and B was cut into rectangular strips of 10 mm in thickness. Thereafter, the pressure-sensitive adhesive film (10 mm) was stuck onto an SUS304 plate (#2000 polishing) at room temperature (23° C.) and left for 30 minutes in a room-temperature atmosphere, and the adhesion of the pressure-sensitive adhesive film when peeled off at a peel angle of 90° in a thermostat chamber at 23° C. was measured (stress rate of the pressure-sensitive adhesive film, 300 mm/min.).
A mirror wafer of 0.15 mm in thickness with a circuit pattern formed thereon, obtained by grinding the back of a semiconductor wafer having a diameter of 8 inches, was used. The separator was released from the dicing/die-bonding film, and the mirror wafer was contact-bonded by pressing a roller at 40° C. to the exposed adhesive layer and then subjected to full-dicing into 1×1 mm square chips. Whether the chip scattering during dicing was examined. In this procedure, none of the dicing/die-bonding films in the Examples and Comparative Examples caused failure such as chips scattering during dicing.
Full-dicing was carried out in the same manner as described above except that the size of the square chips was changed into 5×5 mm, 10×10 mm, and 15×15 mm respectively. Thereafter, the silicon chips (chipped wafer) were picked up in a system for raising the side of the supporting base material by a needle. “o” was given to successful pickup, and “x” was given to unsuccessful pickup.
Chip size: arbitrary (1×1 mm to 15×15 mm square)
Dicing/1 × 1 mm
Dicing/5 × 5 mm
Dicing/10 × 10 mm
Dicing/15 × 15 mm
None of the dicing/die-bonding films in the Examples and the Comparative Examples showed failure in dicing. All chips could be well picked up from the dicing/die-bonding films in the Examples, while in Comparative Example 1, 10×10 mm square and 15×15 mm square chips could not be picked up, and in Comparative Example 2, 5×5 mm square, 10×10 mm square and 15×15 mm square chips could not be picked up. As is evident from the these test results, the dicing/die-bonding film having a pressure-sensitive adhesive layer between a supporting base material and an adhesive layer wherein the adhesion between the adhesive layer and the pressure-sensitive adhesive layer is lower in the wafer-attaching region than in the other region (region onto which a wafer is not stuck) has the adhesion thereof to a dicing ring without failure in dicing, and chips of various sizes can be picked up well.
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No. 29/225,424, for the period of Dec. 1, 2007-Aug. 19, 2008.21Japanese Office Action issued on the related Japanese Patent Application No. 2003-431690, dated Jun. 26, 2007.22Japanese Office Action issued on the related Japanese Patent Application No. 2003-431690, dated Oct. 30, 2007.23Japanese Patent Office Action issued on the related Japanese Patent Application No. 2003-431690, dated Jan. 18, 2007.24Notification of Reasons for Refusal issued on the related Japanese Patent Application No. 2003-152659, dated Sep. 27, 2006.25Written Opinion issued by the Austrian Patent Office on the related Singapore Patent Application No. 200402611-8, dated Apr. 13, 2007.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8178420 *Dec 14, 2009May 15, 2012Nitto Denko CorporationDicing/die-bonding film, method of fixing chipped work and semiconductor deviceUS8586415 *Dec 14, 2011Nov 19, 2013Nitto Denko CorporationDicing/die-bonding film, method of fixing chipped work and semiconductor deviceUS8617928Dec 16, 2008Dec 31, 2013Nitto Denko CorporationDicing/die bonding filmUS8692389Dec 22, 2010Apr 8, 2014Nitto Denko CorporationDicing tape-integrated film for semiconductor back surfaceUS20090209089 *Feb 17, 2009Aug 20, 2009Shuuhei MurataDicing die-bonding filmUS20100093155 *Dec 14, 2009Apr 15, 2010Takeshi MatsumuraDicing/die-bonding film, method of fixing chipped work and semiconductor deviceUS20100233409 *Oct 30, 2008Sep 16, 2010Katsuhiko KamiyaDicing die-bonding filmUS20110053346 *Dec 24, 2008Mar 3, 2011Nitto Denko CorporationDicing/die bonding filmUS20110104873 *Dec 16, 2008May 5, 2011Nitto Denko CorporationDicing/die bonding filmUS20110156280 *Dec 22, 2010Jun 30, 2011Nitto Denko CorporationDicing tape-integrated film for semiconductor back surfaceUS20120088333 *Dec 14, 2011Apr 12, 2012Takeshi MatsumuraDicing/die-bonding film, method of fixing chipped work and semiconductor device* Cited by examinerClassifications U.S. Classification257/782, 257/783, 257/620International ClassificationH01L21/301, H01L21/58, H01L21/78, H01L21/00, H01L21/68, C09J5/00Cooperative ClassificationY10T428/218, Y10T428/2848, Y10T428/28, H01L24/29, H01L2924/01006, C09J2201/36, H01L2924/01005, H01L2924/01033, C09J2433/00, H01L2924/01029, H01L2221/68327, C09J7/02, H01L2924/01004, H01L2224/8385, C09J2201/606, H01L2924/01013, H01L2924/01015, H01L24/83, H01L2924/01027, H01L2924/01019, H01L2924/01016, H01L2924/3025, H01L2924/07802, H01L21/6836, H01L24/27, H01L2224/2919, H01L2224/274, H01L2924/01079, H01L2924/01074, H01L2924/01082, H01L2224/83191, H01L2924/01047, C09J2205/31, C09J2203/326, H01L2924/0665, C09J2201/61, H01L2924/10253Legal EventsDateCodeEventDescriptionDec 28, 2010CCCertificate of correctionMay 10, 2011CCCertificate of correctionMar 11, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services