Harold G Boston

US Patent:

55021565, Mar 26, 1996

Filed:

Jul 28, 1994

Appl. No.:

8/282849

Inventors:

Anne K. St. Clair - Poquoson VA
Stephen A. Ezzell - Woodbury MN
Larry T. Taylor - Blacksburg VA
Harold G. Boston - Newport News VA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

C08G 7310
B05D 506
B32B 2700

US Classification:

528353

Abstract:

Disclosed is a thermally-stable SnO. sub. 2 -surfaced polyimide film wherein the electrical conductivity of the SnO. sub. 2 surface is within the range of about 3. times. 10. sup. -3 to about 1. times. 10. sup. -2 ohms. sup. -1,. Also disclosed is a method of preparing this film from a solution containing a polyamic acid and SnCl. sub. 4 (DMSO). sub. 2.

US Patent:

52180778, Jun 8, 1993

Filed:

Aug 26, 1991

Appl. No.:

7/750158

Inventors:

Anne K. St. Clair - Poqouson VA
Harold G. Boston - Hampton VA
J. Richard Pratt - Fayetteville NC

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

C08G 7310
C08G 6926
C08G 802

US Classification:

528188

Abstract:

A high-temperature stable, highly optically transparent-to-colorless, low dielectric linear aromatic polyimide is prepared by reacting an aromatic diamine with 3,3'bis(3,4-dicarboxyphenoxy)diphenylmethane dianhydride in an amide solvent to form a linear aromatic polyamic acid. This polyamic acid is then cyclized to form the corresponding polyimide, which has the following general structural formula: ##STR1## wherein Ar is any aromatic or substituted aromatic group, and n is 10-100.