Browse Prior Art Database

Double Drop EPD Coating Process

IP.com Disclosure Number: IPCOM000082670D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ciancanelli, JM: AUTHOR [+2]

Abstract

An electrophoretic polymer deposition (EPD) process can be utilized to provide good coating around and under a chip mounted on a module. The modules are processed in an upright position in the following steps. 1. Place a small drop of the polymer bath that has been diluted to a viscosity of about 20-35 centipoise on the chip. Capillary forces will draw the liquid under the chip. 2. Place a larger drop of the polymer bath that has been thickened to a viscosity of about 100 centipoise on the chip. The second drop surrounds the first drop. 3. Apply a DC potential of about 3-4 volts and about 3-6 ma from the module pins to the second drop. 4. Rinse. 5. Air dry for about 10 minutes. 6. Allow the film to form for about two hours at about 80-85 degrees C. 7. Cure for about 20 minutes at about 140 degrees C.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Double Drop EPD Coating Process

An electrophoretic polymer deposition (EPD) process can be utilized to provide good coating around and under a chip mounted on a module. The modules are processed in an upright position in the following steps. 1. Place a small drop of the polymer bath that has been diluted to a viscosity of about 20-35 centipoise on the chip. Capillary forces will draw the liquid under the chip. 2. Place a larger drop of the polymer bath that has been thickened to a viscosity of about 100 centipoise on the chip. The second drop surrounds the first drop. 3. Apply a DC potential of about 3-4 volts and about 3-6 ma from the module pins to the second drop. 4. Rinse. 5. Air dry for about 10 minutes. 6. Allow the film to form for about two hours at about 80-85 degrees C. 7. Cure for about 20 minutes at about 140 degrees C.

1