Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-10-06
2003-04-29
Sellers, Robert E. L. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C257S789000, C257S793000, C438S127000, C523S211000, C525S508000, C525S533000
Reexamination Certificate
active
06555602
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an epoxy resin-based composition for semiconductor encapsulation which exhibits a low viscosity at a temperature as relatively low as 80° C. or lower and is excellent particularly in dischargeability and coatability as well as storage stability, a semiconductor device prepared by using the epoxy resin-based composition and a process for the production of the semiconductor device.
BACKGROUND OF THE INVENTION
In order to encapsulate semiconductors at TAP (Tape Automated Bonding) process, COB (Chip On Board) process, etc., a liquid encapsulating medium has heretofore been used. Such a liquid encapsulating medium is used at room temperature (25° C.). By means of a dispenser or through printing process, semiconductor elements are encapsulated with such a resinous medium to produce semiconductor devices. As such a liquid encapsulating medium there has been generally known an epoxy resin composition comprising a liquid epoxy resin, an acid anhydride-based liquid curing agent, an ordinary curing accelerator and a silica powder.
The foregoing liquid encapsulating medium comprises an acid anhydride-based curing agent as a curing agent and thus can be easily liquefied and fairly discharged and applied. However, the foregoing liquid encapsulating medium is disadvantageous in that it exhibits a high hydroscopicity under high humidity conditions and thus shows a deteriorated reliability in humidity resistance. Further, the foregoing liquid encapsulating medium normally stays liquid and thus exhibits a poor storage stability. Accordingly, the foregoing liquid encapsulating medium shows a drastic resin in viscosity or liable to sedimentation of silica powder during storage at room temperature and thus needs to be frozen to solid or otherwise stored in a special manner.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a resin composition from semiconductor encapsulation which has a long pot life and is excellent not only in storage stability but in dischargeability and coatability, a semiconductor device encapsulated with the resin composition for semiconductor encapsulation and a process for the production of the semiconductor device.
The foregoing object of the invention will become apparent from the following detailed description and examples.
The foregoing object of the invention is accomplished with the first essence of the invention which lies in a resin composition for semiconductor encapsulation comprising the following components (A) to (D), having a viscosity as measured at 25° C. of 700 Pa•s or higher or being solid at 25° C. and having a viscosity as measured at 80° C. of 500 Pa•s or lower:
(A) an epoxy resin;
(B) an acid anhydride-based curing agent;
(C) a latent curing accelerator; and
(D) an inorganic filler.
The second essence of the invention lies in a semiconductor device comprising a semiconductor element provided on a wiring circuit board with a plurality of connecting electrode portions interposed therebetween, the gap between the wiring circuit board and the semiconductor element being sealed with an encapsulating resin layer, wherein the encapsulating resin layer is formed by the foregoing resin composition for semiconductor encapsulation.
The third essence of the invention lies in a process for the production of a semiconductor device comprising a semiconductor element provided on a wiring circuit board with a plurality of connecting electrode portions interposed therebetween, the gap between the wiring circuit board and the semiconductor element being sealed with an encapsulating resin layer, which comprises filling the gap between the wiring circuit board and the semiconductor element with the foregoing resin composition for semiconductor encapsulation, and then curing the resin composition to form the encapsulating resin layer.
The fourth essence of the invention lies in a semiconductor device comprising a semiconductor element provided on a wiring circuit board, the wiring circuit board and the semiconductor element being electrically connected to each other, the semiconductor element being encapsulated by an encapsulating resin layer in such an arrangement that the semiconductor element is incorporated therein, wherein the encapsulating resin layer is formed by the foregoing resin composition for semiconductor encapsulation.
The fifth essence of the invention lies in a process for the production of a semiconductor device comprising a semiconductor element provided on a wiring circuit board, the wiring circuit board and the semiconductor element being electrically connected to each other, the semiconductor element being encapsulated by an encapsulating resin layer in such an arrangement that the semiconductor element is incorporated therein, which comprises placing a semiconductor element on the wiring circuit board, electrically connecting the wiring circuit board and the semiconductor element to each other, supplying the foregoing resin composition for semiconductor encapsulation onto the wiring circuit board on the semiconductor element side thereof, and then curing the resin composition for semiconductor encapsulation to form the encapsulating resin layer.
The sixth essence of the invention lies in a semiconductor product comprising a semiconductor device having a resin encapsulation layer formed with a plurality of connecting electrode portions interposed therebetween, the semiconductor device being provided on a mounting board with the wiring circuit board of the semiconductor device being opposed to the mounting board and the gap between the mounting board and the semiconductor device being sealed with an encapsulating resin layer, wherein the encapsulating resin layer is formed by the foregoing resin composition for semiconductor encapsulation.
The seventh essence of the invention lies in a process for the production of a semiconductor device, which comprises a step of forming a resin layer made of the foregoing resin composition for semiconductor encapsulation on the protruding electrode portion side of a semiconductor wafer having a plurality of semiconductor elements with protruding electrode portions formed thereon to a predetermined thickness in such an arrangement that at least the forward end of the protruding electrode portions is exposed to the exterior of the resin layer, and a step of cutting the semiconductor wafer having a resin layer formed thereon to individual semiconductor elements.
The eighth essence of the invention lies in a process for the production of a semiconductor device, which comprises a step of supplying the resin composition for semiconductor encapsulation onto the whole of a plurality of semiconductor elements provided on a matrix wiring circuit board having individual circuits formed thereon to form a resin layer with the semiconductor elements being incorporated therein, and a step of cutting the matrix wiring circuit board having a resin layer formed thereon with the semiconductor elements being incorporated therein together with the resin layer to every semiconductor element.
The ninth essence of the invention lies in a process for the production of a semiconductor device, which comprises a step of forming a resin layer made of the foregoing resin composition for semiconductor encapsulation on the protruding electrode portion side of a semiconductor wafer having a plurality of semiconductor elements with protruding electrode portions formed thereon to a predetermined thickness, a step of cutting the semiconductor wafer having a resin layer formed thereon to individual semiconductor elements, and a step of contact-bonding a wiring circuit board and the semiconductor element thus cut under heating with the resin layer side of the semiconductor element and the wiring circuit board being opposed to each other so that the two components are electrically connected to each other and the resin layer is melted and cured to form an encapsulating resin layer between the semiconductor element and the wiring circuit board, thereby en
Harada Tadaaki
Hosokawa Toshitsugu
Nitto Denko Corporation
Sellers Robert E. L.
Sughrue & Mion, PLLC
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