Source: http://www.google.com/patents/US7780811?ie=ISO-8859-1
Timestamp: 2015-01-31 16:55:47
Document Index: 459586922

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

Patent US7780811 - Dicing die-bonding film, method of fixing chipped work and semiconductor device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe dicing die-bonding film of this invention 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), wherein a releasability in an interface between the pressure-sensitive adhesive layer (2)...http://www.google.com/patents/US7780811?utm_source=gb-gplus-sharePatent US7780811 - Dicing die-bonding film, method of fixing chipped work and semiconductor deviceAdvanced Patent SearchPublication numberUS7780811 B2Publication typeGrantApplication numberUS 11/671,982Publication dateAug 24, 2010Filing dateFeb 6, 2007Priority dateMay 29, 2003Fee statusPaidAlso published asCN1574286A, CN100337322C, EP1482546A2, EP1482546A3, US7449226, US20040241910, US20070137782Publication number11671982, 671982, US 7780811 B2, US 7780811B2, US-B2-7780811, US7780811 B2, US7780811B2InventorsTakeshi Matsumura, Masaki Mizutani, Sadahito MisumiOriginal AssigneeNitto Denko CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (108), Non-Patent Citations (35), Referenced by (3), Classifications (57), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetDicing die-bonding film, method of fixing chipped work and semiconductor deviceUS 7780811 B2Abstract The dicing die-bonding film of this invention 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), 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 the whole of the other region (3 b), and the releasability of the interface (A) is higher than the releasability of the interface (B). According to this invention, there can be provided a dicing die-bonding film excellent in balance between retention in dicing a work and releasability in releasing its diced chipped work together with the die-bonding adhesive layer.
1. A method of fixing a chipped work, comprising:
providing a dicing die-bonding film comprising a radiation-curable pressure sensitive adhesive layer formed on a supporting base material and a die-bonding adhesive layer on the pressure sensitive adhesive layer, wherein the die-bonding adhesive layer is arranged as a work-attaching region on a part of the pressure-sensitive adhesive layer, wherein
wherein the adhesion of said region of the pressure-sensitive adhesive layer corresponding to the work-attaching region is lower than the adhesion of said other region of the pressure-sensitive adhesive layer;
pressing a work onto the work-attaching region of the die-bonding adhesive layer in the dicing die-bonding, thereby attaching the whole area of a face of the work to the work-attaching region attached which is larger than the whole area of the work face;
pressing a dicing ring onto said other region of the pressure-sensitive adhesive layer, thereby attaching the dicing ring to the pressure-sensitive adhesive layer while fitting the work-attaching region within the inner diameter of the dicing ring;
dicing the work into chips;
releasing the chipped work together with the die-bonding adhesive layer from the pressure-sensitive adhesive layer; and
fixing the chipped work to a semiconductor element via the die-bonding adhesive layer.
2. The method of fixing the chipped work according to claim 1, wherein the ratio of adhesion of said region of the pressure-sensitive adhesive layer corresponding to the work-attaching region relative to the adhesion of said other region of the pressure-sensitive adhesive layer is 42.2-60:1.
3. The method of claim 1, wherein the pressure sensitive adhesive layer is not irradiated between said pressing a work step and said releasing step.
4. A method for producing a semiconductor device, comprising the steps of:
providing a dicing die-bonding film comprising a supporting base material, a pressure-sensitive adhesive layer and a die-bonding adhesive layer, wherein said pressure-sensitive adhesive layer is interposed between said supporting base material and said die-bonding adhesive layer, wherein a surface area of said die-bonding adhesive layer is configured to be larger than a face area of a work to be attached to said die-bonding adhesive layer
pressing said work onto said die-bonding adhesive layer;
pressing a dicing ring onto a pressure-sensitive adhesive layer so that said die-bonding adhesive layer is held within the inner diameter of said dicing ring;
dicing said work into chips;
releasing said chipped work together with said die-bonding adhesive layer from said pressure-sensitive adhesive layer; and
fixing said chipped work to a semiconductor element via said die-bonding adhesive layer to produce a semiconductor device.
5. The method of claim 4, wherein the pressure sensitive adhesive layer is not irradiated between said pressing a work step and said releasing step.
6. The method according to claim 4, wherein the step of preparing a dicing die-bonding film comprises forming said die-bonding adhesive layer by using a thermosetting die adhesive.
7. The method according to claim 4, wherein said die-bonding adhesive layer is non-conducting. Description
This is a divisional of U.S. patent application Ser. No. 10/849,414, filed May 19, 2004, which claims priority to Japanese Patent Application No. 2003-152659, field May 29, 2003, the disclosure of which is incorporated herein by reference in its entirety.
For example, when the face of work (W) is circular with diameter (m1), the work-attaching region (3 a) is designed to be circular with diameter (m2) satisfying the relationship m2>m1. The width difference (m2−m1) is suitably determined depending on the size of the work face (B), and when the diameter of the work face is 1 to 12 inches (about 300 mm), the width difference is preferably designed to be usually 0.1 mm or more, particularly 0.5 mm or more. In relationship with the inner diameter (m3) of the dicing ring (WR), the work-attaching region (3 a) is designed to satisfy the relationship m3>m2. The difference (m3−m2) is not particularly limited, but is preferably 5 mm or more, more preferably 10 mm or more. When the work (W) is attached to the work-attaching region (3 a), the outer periphery width difference(s) between the whole outer periphery of the work-attaching region (3 a) and the whole outer periphery of the work face is preferably nearly uniform along the whole outer periphery. That is, the work is preferably attached such that the outer periphery width difference (s)≈(m2−m1)/2.
The acrylic polymer is, for example, an acrylic polymer using one or more monomer components selected from alkyl (meth)acrylates (for example, C1-30 alkyl, particularly C4-18 linear or branched alkyl esters such as methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, s-butyl ester, t-butyl ester, pentyl ester, isopentyl ester, hexyl ester, heptyl ester, octyl ester, 2-ethyl hexyl ester, isooctyl ester, nonyl ester, decyl ester, isodecyl ester, undecyl ester, dodecyl ester, tridecyl ester, tetradecyl ester, hexadecyl ester, octadecyl ester, eicosyl ester etc.) and cycloalkyl(meth)acrylates (for example, cyclopentyl ester, cyclohexyl ester etc.). The (meth)acrylates refer to acrylates and/or methacrylates, and in this meaning, (meth) is used throughout in this invention.
For the purpose of improving cohesiveness and heat resistance, the acrylic polymer may contain units corresponding to other monomer components copolymerizable with the above (meth)acrylates and cycloalkyl esters. Such monomer components include, for example, carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl (meth)acrylate, carboxypentyl(meth)acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid; acid anhydride monomers such as maleic anhydride and itaconic anhydride; hydroxyl group-containing monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate and (4-hydroxymethylcyclohexyl)methyl (meth)acrylate; sulfonic acid group-containing monomers such as styrenesulfonic acid, allylsulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid and sulfopropyl (meth)acrylate, (meth)acryloyloxy naphthalene sulfonic acid; phosphate group-containing monomers such as 2-hydroxyethylacryloyl phosphate; and acrylamide, acrylonitrile etc. One or more of these copolymerizable monomer components can be used. The amount of these copolymerizable monomers is preferably 40% or less by weight based on the total monomer components.
The pressure-sensitive adhesive can suitably use an external crosslinking agent for increasing the number-average molecular weight of the acrylic polymer etc. as the base polymer.
A specific means of an external crosslinking method includes a method of reacting monomers by adding a crosslinking agent such as polyisocyanate compound, epoxy compound and aziridine compound, melamine-based crosslinking agent. When the external crosslinking agent is used, the amount of the crosslinking agent used is suitably determined according to balancing with the base polymer to be crosslinked and the use of the pressure-sensitive adhesive. Generally, the external crosslinking agent is compounded in an amount of preferably 5 parts or less by weight, more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the base polymer. If necessary, the pressure-sensitive adhesive may include various kinds of conventional additives such as tackifier, antioxidants etc.
For curing with UV rays etc., the radiation-curing pressure-sensitive adhesive is blended with a photopolymerization initiator. The photopolymerization initiator includes, for example, α-ketol compounds such as 4-(2-hydroxyethoxy)pheny(2-hydroxy-2-propyl)ketone, α-hydroxy-α,α′-dimethyl acetophenone, 2-methyl-2-hydroxypropiophenone and 1-hydroxycyclohexyl phenyl ketone; acetophenone compounds such as methoxy acetophenone, 2,2-dimethoxy-2-phenyl acetophenone, 2,2-diethoxy acetophenone and 2-methyl-1-[4-(methylthio)-phenyl]-2-morpholinopropane-1; benzoin ether compounds such as benzoin ethyl ether, benzoin isopropyl ether and anisoin methyl ether; ketal compounds such as benzyl dimethyl ketal; aromatic sulfonyl chloride compounds such as 2-naphthalene sulfonyl chloride; optically active oxime compounds such as 1-phenone-1,1-propanedione-2-(o-ethoxycarbonyl)oxime; benzophenone compounds such as benzophenone, benzoylbenzoic acid and 3,3′-dimethyl-4-methoxy benzophenone; thioxanthone compounds such as thioxanthone, 2-chlorothioxanthone, 2-methyl thioxanthone, 2,4-dimethyl thioxanthone, isopropyl thioxanthone, 2,4-dichlorothioxanthone, 2,4-diethyl thioxanthone and 2,4-diisopropyl thioxanthone; camphor quinone; halogenated ketones; acyl phosphinoxides; and acyl phosphonates. The amount of the photopolymerization initiator blended is for example 0.05 to 20 parts by weight based on 100 parts by weight of the base polymer such as acrylic polymer constituting the pressure-sensitive adhesive.
As the method of forming the pressure-sensitive adhesive layer (2 a), mention is made of a method wherein the radiation-curing pressure-sensitive adhesive layer (2) is formed on the supporting base material (1), and a region corresponding to the work-attaching region (3 a) is cured by partial irradiation with radiations, to form the pressure-sensitive adhesive layer (2 a). The partial irradiation with radiations can be carried out via a photomask having a pattern corresponding to the region (3 b, etc.) other than the work-attaching region (3 a). Mention is also made of a method of curing the pressure-sensitive adhesion layer by spot irradiation with UV rays. Formation of the radiation-curing pressure-sensitive adhesive layer (2) can be carried out by transferring the layer arranged on a separator to the supporting base material (1). The radiation-curing pressure-sensitive adhesive layer (2) arranged on the separator may be subjected to partial curing radiations.
Production Example (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.
region with UV rays
After attachment
SUS304 (N/10 mm)
the dicing ring
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