Low radio frequency loss, static dissipative adhesives

Patent metadata

Field	Value
Publication number	US-9410060-B2
Application number	US-201514610206-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Mar 4, 2009
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Low radio frequency loss, static dissipative adhesives are disclosed that have at most 2 percent by weight amorphous carbon dispersed in a cyanate ester resin. The adhesive has an electrical conductivity that dissipates static charge with an electrical resistivity of about 3.0×10 5 ohms to about 3.0×10 10 ohms, and low radio frequency loss with a dielectric constant of about 1.3 to about 1.7 and a loss tangent of at most 0.006 measured at 2 gigahertz.

First claim

What is claimed is:

1. An adhesive consisting essentially of:
greater than zero and at most 2 percent by weight amorphous carbon dispersed in a cyanate ester resin;
wherein the adhesive has an electrical conductivity that dissipates static charge, the electrical conductivity being an electrical resistance of about 3.0×10 5 ohms to about 3.0×10 10 ohms;
wherein the adhesive has low radio frequency loss, the low radio frequency loss being a dielectric constant of about 1.3 to about 1.7 and a loss tangent of at most 0.006 measured at 2 gigahertz;
wherein the amorphous carbon has an average particle size of less than 30 nm.

2. The adhesive of claim 1 wherein the amorphous carbon is carbon black.

3. The adhesive of claim 1 wherein the amorphous carbon has an average particle size of at most 25 microns.

4. The adhesive of claim 1 wherein the cyanate ester resin is a bisphenol-A-based cyanate ester resin.

5. The adhesive of claim 1 further comprising a solvent and/or a pigment.

6. The adhesive of claim 1 formulated as a liquid, paste or film.

7. The adhesive of claim 1 wherein the amorphous carbon comprises at most 1.5 percent by weight of the adhesive.

8. The adhesive of claim 1 wherein the amorphous carbon comprises at most 1 percent by weight of the adhesive.

9. The adhesive of claim 1 wherein the amorphous carbon comprises at most 0.5 percent by weight of the adhesive.

10. The adhesive of claim 1 wherein the amorphous carbon is present in a quantity sufficient to impart the adhesive with an electrical resistance of at most 10 9 Ohms.

11. The adhesive of claim 1 wherein the amorphous carbon is present in a quantity sufficient to impart the adhesive with an electrical resistance of at most 10 7 Ohms.

Assignees

• Boeing Co

Inventors

• Long Lynn Edward
• Moss Randall Jay

Classifications

• C09J179/00

  Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00 · CPC title

• C09J179/04

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors · CPC title

• C09J9/02 Primary

  Electrically-conducting adhesives · CPC title

• C08K3/04 Primary

  Carbon · CPC title