Browse Prior Art Database

Vapor Primed and Deposited Conformal Coating

IP.com Disclosure Number: IPCOM000088812D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Clark, RJ: AUTHOR

Abstract

It is known that the use of certain trialkoxysilanes can significantly improve the adhesion of polymer to glass and metals. The key factors in the degree of improvement are uniformity of priming and coverage, prevention of corrosion of the adherend surface, chemical compatibility of process between the adherend, coupling agent and adherents. In this recommended process, both the silane [N(beta-aminoethyl) gamma amino-propyltrimethoxysilane] and the conformal coating materials can be vapor-deposited simultaneously to prevent any unwanted contamination from occurring.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 1 of 1

Vapor Primed and Deposited Conformal Coating

It is known that the use of certain trialkoxysilanes can significantly improve the adhesion of polymer to glass and metals. The key factors in the degree of improvement are uniformity of priming and coverage, prevention of corrosion of the adherend surface, chemical compatibility of process between the adherend, coupling agent and adherents. In this recommended process, both the silane [N(beta-aminoethyl) gamma amino-propyltrimethoxysilane] and the conformal coating materials can be vapor-deposited simultaneously to prevent any unwanted contamination from occurring. The uniqueness of this process is that the silane additive has a slightly lower vaporization temperature than that of the parylene dimers, thus the process is self priming, which switches to a copolymer structure and finally to a pure polymer structure as the temperature in the vaporizing chamber climbs to its preset conditions. The conformal coating process is as follows: 1) Mix the parylene and the silane additive in a ratio ranging 10:1 to 14:1. 2) Place the mixed material as a charge into vaporizer chamber. 3) Evacuate the complete coating system until base line pressure stabilizes at approximately 49 microns. 4) Heat the mixture. Vaporizer temperature will range from 135 Degrees C to 195 Degrees C. 5) The rate of fractional distillation is monitored and controlled through the measurement of pressure increases. The monitor is physically located between the pyrolysis chamber...