Leo A Roos

US Patent:

51642840, Nov 17, 1992

Filed:

Nov 19, 1991

Appl. No.:

7/794773

Inventors:

James J. Briguglio - Balboa CA
Leo Roos - Laguna Beach CA
Clancy P. Crooks - Cypress CA
Samuel W. Shoemaker - San Bernardino CA

Assignee:

Morton International, Inc. - Chicago IL

International Classification:

G03C 1112

US Classification:

430258

Abstract:

A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board. With heat, vacuum and mechanical pressure, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, partially conforming the photoimageable composition layer to the contours thereof. Within about 60 seconds and with the photoimageable composition layer still heated, the cover sheet is peeled away, leaving the top coat as a protective covering over the photoimageable composition layer. Removal of the cover sheet allows the photoimageable composition layer to fully conform to the contours of the printed circuit board. Immediately thereafter, the circuit board is cooled to about ambient temperature or below.

US Patent:

48943142, Jan 16, 1990

Filed:

Nov 16, 1988

Appl. No.:

7/273757

Inventors:

Robert Barr - Huntington Beach CA
Leo Roos - Laguna Beach CA
Lawrence Crane - Tustin CA

Assignee:

Morton Thiokol, Inc. - Chicago IL

International Classification:

G03C 168
G03C 170

US Classification:

430281

Abstract:

Photoinitiator compositions are disclosed which contain 3,3'-carbonyl bis(7-diethylaminocoumarin); an alkyl ester of a p-dialkylamino benzoic acid; and either camphorquinone or a 2,4,5-triphenylimidazolyl dimer. Photoinitiators are also provided which contain 3,3'-carbonyl bis(7-diethylaminocoumarin); an alkyl ester of a p-dialkylamino benzoic acid; camphorquinone and a 2,4,5-triphenylimidazolyl dimer. These latter photoinitiators are particularly useful in photopolymerizable compositions which are polymerized by exposure to visible laser light.

US Patent:

49435132, Jul 24, 1990

Filed:

Oct 7, 1988

Appl. No.:

7/255579

Inventors:

Melvin A. Lipson - Newport Beach CA
Thomas P. Carter - Laguna Beach CA
James G. Shelnut - Lake Forest CA
Leo Roos - Laguna Beach CA

Assignee:

Morton Thiokol, Inc. - Chicago IL

International Classification:

G03C 190
G03C 168

US Classification:

430260

Abstract:

A photoimageable composition of the negative acting type which includes a binder polymer which contains carboxyl groups is provided with a metal chelate in which the coordination number of the metal is 2 or higher. When the photoimageable composition is coated as a layer on a dry film, the metal chelate reacts with the carboxyl groups of the polymer, releasing a metal ion which bridges carboxyl groups of two or more polymer molecules. This bridging reduces cold flow of the photoimageable composition layer of the dry film.

US Patent:

48897906, Dec 26, 1989

Filed:

Feb 26, 1988

Appl. No.:

7/160895

Inventors:

Leo Roos - Laguna Beach CA
Fredrick J. Axon - Worsley, GB2
James J. Briguglio - Newport Beach CA

Assignee:

Morton Thiokol, Inc. - Chicago IL

International Classification:

G03C 1112

US Classification:

439258

Abstract:

A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board with a minor portion of the area of the photoimageable composition layer tacked to the printed circuit board. The cover sheet is peeled away. With heat and vacuum, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, conforming the photoimageable composition layer to the contours thereof and leaving the top coat as a protective covering over the photoimageable composition layer. The photoimageable composition layer is exposed to patterned actinic radiation, developed and cured to form a hard, permanent solder mask.

US Patent:

52139450, May 25, 1993

Filed:

Jul 25, 1991

Appl. No.:

7/735507

Inventors:

Leo Roos - Laguna Beach CA
Fredrick J. Axon - Manchester, GB2
James J. Briguglio - Newport Beach CA

Assignee:

Morton International, Inc. - Chicago IL

International Classification:

G03C 178

US Classification:

430270

Abstract:

A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board with a minor portion of the area of the photoimageable composition layer tacked to the printed circuit board. The cover sheet is peeled away. With heat and vacuum, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, conforming the photoimageable composition layer to the contours thereof and leaving the top coat as a protective covering over the photoimageable composition layer. The photoimageable composition layer is exposed to patterned actinic radiation, developed and cured to form a hard, permanent solder mask.

US Patent:

49923544, Feb 12, 1991

Filed:

Oct 28, 1988

Appl. No.:

7/264472

Inventors:

Frederick J. Axon - Manchester, GB2
James J. Briguglio - Newport Beach CA
Amedeo Candore - Bodio Lomnago, IT
Lawson Lightfoot - Chesire, GB2
Clancy P. Crooks - Cypress CA
Leo Roos - Laguna Beach CA

Assignee:

Morton International, Inc. - Chicago IL

International Classification:

G03C 1112

US Classification:

430258

Abstract:

A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board with a minor portion of the area of the photoimageable composition layer tacked to the printed circuit board. The cover sheet is peeled away. With heat and vacuum, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, conforming the photoimageable composition layer to the contours thereof and leaving the top coat as a protective covering over the photoimageable composition layer. The photoimageable composition layer is exposed to patterned actinic radiation, developed and cured to form a hard, permanent solder mask.