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Laser Removal of Polymer Coating

IP.com Disclosure Number: IPCOM000091121D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hawkins, CR: AUTHOR [+2]

Abstract

Laser radiation, in the presence of oxygen, is used to remove polymer coatings from metal parts. For example, the use of an O(2) envelope during CO(2) laser irradiation produces gaseous by-products. Thus, the clean removal is permitted of the conformal PARYLENE C* coating from metal contacts of gold and nickel, precluding the necessity of subsequent mechanical removal. In the absence of oxygen, charring occurs.

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Laser Removal of Polymer Coating

Laser radiation, in the presence of oxygen, is used to remove polymer coatings from metal parts. For example, the use of an O(2) envelope during CO(2) laser irradiation produces gaseous by-products. Thus, the clean removal is permitted of the conformal PARYLENE C* coating from metal contacts of gold and nickel, precluding the necessity of subsequent mechanical removal. In the absence of oxygen, charring occurs.

A Coherent Radiation Laboratories CO(2) Model 40 laser yielding approximately 100 watts is used. The following laser parameters are effective: Lens: LS-O5

Focal distance: 10 inches

Spot size: .040 in. diameter

Current: 150 milliamperes

Gas pressure: 15 m mu Hg

Pulse length: 15-150 msecond.

The CO(2) radiation of 10.6 mu wavelength is suited for this method. The PARYLENE C is at least 80% absorptive to the radiation and the gold is essentially 0% absorptive permitting preferential attack of the PARYLENE C. *Trademark of Union Carbide Corp.

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