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TEST FOR MEASURING ADHESION OF DEPOSITED METAL LAYER TO A POLYMER SUBSTRATE

IP.com Disclosure Number: IPCOM000025676D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 133K

Publishing Venue

Xerox Disclosure Journal

Abstract

No previously available, simple, reliable standard test has been found that can measure in a reproducible manner the adhesive strength of a deposited metal coating to a flexible substrate. For example, ASTM test B533-79 is particularly difficult to perform. Another test involving the cementing of an aluminum billet to a metal coating deposited on a substrate and measuring the force necessary to remove the billet and cemented metal coating from the underlying substrate proved cumbersome and did not provide reproducible results.

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XEROX DISCLOSURE JOURNAL

TEST FOR MEASURING ADHESION OF DEPOSITED METAL LAYER TO A POLYMER SUBSTRATE
John A. Bergfjord

Proposed Classification
U.S. C1.73/150A Int. C1. GOlb 28/08

Volume 12 Number 2 March/April 1987 67

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TEST FOR MEASURING ADHESION OF DEPOSITED METAL LAYERTO A POLYMER SUBSTRATE (Cont'd)

No previously available, simple, reliable standard test has been found that can measure in a reproducible manner the adhesive strength of a deposited metal coating to a flexible substrate. For example, ASTM test B533-79 is particularly difficult to perform. Another test involving the cementing of an aluminum billet to a metal coating deposited on a substrate and measuring the force necessary to remove the billet and cemented metal coating from the underlying substrate proved cumbersome and did not provide reproducible results.

A successful testing device has been assembled and is illustrated in the accompanying diagram. In conducting the test, a 9 inch by 12 inch sheet of polymer substrate bearing a continuous deposited metal layer was coated with a 15 micrometer layer of polymer film cast from a solvent. The polymer film comprised a mixture of 99 percent polycarbonate resin to give the polymer film strength and 1 percent by weight of a polyester to promote adhesion of the polymer film to the metal surface. The polymer was applied as a coating solution of 10 percent by weight polymer mixture in methylene chloride solvent. The polymer solution was evenly deposited on the surface of the metal layer using a 4.5 mil wet gap Bird coating bar which was moved over the surface of the metal layer at a constant speed. After allowing the solvent to flash off for about 10 minutes, the sample was placed in a 100°C oven for about 30 to 60 minutes. Upon removal, the sample was cut into narrow 8 inch by 1/2 inch strips. A segment 20 of cast polymer/metal layer was stripped from a corresponding segment 30 the polymer substrate for a distance of 4 inches. A razor blade facilitated initiation of separation for stripping. As shown the attached diagram, the narrow sample strip 40 was mounted to a
0.05 inch thick aluminum backing plate 50...