Stauffer Chemical Company

National Starch and Chemical Investment Holding Corporation

National Starch and Chemical Corporation

Investment Holding Corporation

Joseph A Aurichio

Gregory M Sheyon

Jagadish C Goswami

Paul D Fisher

Joseph R Zingaro

A conductive die attach tape is described which allows for mounting of diced semiconductor chips thereon, followed by removal of the chip with an adherent conductive adhesive, and the mounting of the chip/adhesive combination in a chip carrier preparatory to the wire bonding operation.

Conductive die attach tape

The bonding of semiconductor chips to a substrate is described wherein the first step involves the bonding of a tacky, curable and partially cured chip bonding adhesive, which is releasably supported on a support film, to the surface of the chip intended to be bonded to the substrate. The second step involves the further partial heat curing of the adhesive to convert it to a non-tacky state so that the adhesive will not undesirably stick during handling and storage operations. Thereafter, the chip with its adherent adhesive can be mounted to a substrate at elevated temperature to convert the adhesive to a more tacky state. The final step involves the curing of the adhesive after it has been used to bond the chip to the substrate.

Method of bonding a semiconductor chip to a substrate

A dicing film to support semiconductor wafers as they are diced into individual chips comprises a support film (e.g., of thermoplastic polymer), a release layer on one side of the film, and a pattern of conductive adhesive attached to the release layer for bonding to the wafer or wafers. The release layer allows for separation of the chip/conductive adhesive combination from the support film. Preferably, the adhesive is covered by a removable release liner prior to mating of the wafer and adhesive.

Carrier film with conductive adhesive for dicing of semiconductor wafers

The present invention is a tape product suitable for use in the protection of semiconductor devices from alpha-particles. The product comprises a heat resistant support film, a pressure sensitive adhesive layer on one side of the support film, a least one alpha-particle protector member formed of a plastic material capable of protecting the semiconductor device releasably supported on the pressure sensitive adhesive, and a layer of heat resistant adhesive bonded to the plastic material on its side lying opposite to the side bonded to the pressure sensitive adhesive. Preferably, a primer layer lies between the heat resistant support film on the pressure sensitive adhesive to insure that clean removal of the support film and pressure sensitive adhesive from the surface of the alpha-particle protector member. In order to aid in this removal the surface of the alpha-particle protector member facing the pressure sensitive layer is also coated with a release coating. The product is used by bonding the heat resistant adhesive side of the transfer tape product to one or more die patterns on a semiconductor wafer and by then stripping the support film and pressure sensitive adhesive from the top surface of the applique after the applique.

Alpha-particle protection of semiconductor devices

A novel adhesive exhibiting low outgassing upon exposure to high temperatures is disclosed. The instant adhesive comprises: (a) a soluble polyimide resin, (b) a solvent for said polyimide resin, (c) an epoxy resin, (d) a cross-linking agent reactive with the polyimide solvent of (b), and (e) a catalyst which accelerates the reaction between (b) and (d). Optionally, the adhesive may also contain a conductive material. A process for making the adhesive is also disclosed.

Thermally stable adhesive comprising soluble polyimide resin and epoxy

The present invention is a die attach film which is adapted for adhesive mounting to a dicing frame. The film contains a support film, a curable die bonding adhesive releasably mounted on the support film which is adapted to receive semiconductor wafer, semiconductor die, and the like, and adhesive means to bond the support film to a dicing frame. In one embodiment the adhesive means comprise pressure sensitive adhesive means on the support film itself adjacent the portions designed to contact the dicing frame. In another embodiment, the adhesive means comprise a larger tacky film bonded to the bottom of the support film for the die attach film.

Adhesively mountable die attach film

Semiconductor chips, which have been diced, can be removed from the conductive adhesive/polymer support film holding them, without leaving residual adhesive on the film if the wafer/adhesive support film laminate is heated prior to the dicing step. The heating step increases the release characteristics between the adhesive and film.

Removal of semiconductor wafers from dicing film

A novel adhesive exhibiting low outgassing upon exposure to high temperature is disclosed. The instant adhesive comprises: (a) a soluble polyimide resin, (b) a solvent for said polyimide resin, (c) a tackifier, (d) an epoxy resin, (e) a hardener for said epoxy resin, (f) a catalyst which catalyzes the reaction between the epoxy and hardener, (g) a cross-linking agent reactive with the polyimide solvent of (b), (h) a catalyst which accelerates the reaction between (b) and (g), and (i) a filler material. Optionally, the adhesive may also contain a conductive material. A process for making the adhesive is also disclosed.

Thermally stable adhesive

A process for coating a material, e.g. a vinyl material, to improve its wear resistance and the coated article produced thereby is disclosed. The coating comprises an interpolymer comprising from about 50-95% by weight polyvinyl chloride and from about 5-50% by weight of an acrylate dissolved in an organic solvent.

Vinyl chloride interpolymer coating composition

A process for coating a material, e.g. a vinyl material, to improve its wear resistance and the coated article produced thereby is disclosed. The coating comprises an interpolymer comprising from about 50-95% by weight polyvinyl chloride and from about 5-50% by weight of an acrylate.

Growing community of inventors

Anderson, SC, United States of America

Joseph A Aurichio