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United States Patent 5,317,058
Dougherty, et. al.May 31, 1994

Microwave-absorbing materials containing polar icosahedral molecular units and methods of making the same

Inventors: Dougherty; Thomas K. (Playa Del Rey, CA); Harris; Norman H. (Newhall, CA); Chow; James R. (Alhambra, CA); Pierce; Brian M. (Moreno Valley, CA); Whelan; David A. (Chatworth, CA).
Assignee: Hughes Aircraft Company (Los Angeles, CA).
Appl. No.: 870,023
Filed: Apr. 17, 1992

Intl. Cl.:C08G 63/91; C08G 79/08; C08F 8/00; C08F 4/52;
U.S. Cl.:525/64.; 523/137.;
Field of Search:4;5

References Cited

U.S. Patent Documents
3,109,031Oct., 1963Goldstein 260/606 .5
3,201,377Aug., 1965Green et al. 528/ 4
3,637,589Jan., 1972Kwasnik et al. 528/ 4
3,699,024Oct., 1972Klingen et al. 526/239
3,816,380Jun., 1974Reed, Jr. 526/239
3,850,820Nov., 1974Korshak et al. 528/ 4
4,001,191Jan., 1977Reed, Jr. 526/239
4,235,987Nov., 1980Peters 528/ 4
5,172,278Dec., 1992Tutt 359/361

Other References

Primary Examiner: Michl; Paul R.
Assistant Examiner: Yoon; Tae H.


A microwave-absorbing material composed of blends of polar icosahedral molecular units with a variety of host matrices, or with polymers with the units covalently bonded in a pendant manner to the polymer chain. Both blends and polymers must impart a high degree of orientational mobility to the units so that they can absorb microwave radiation. These materials employ orientationally mobile, polar icosahedral molecular units as the source of dielectric loss at microwave frequencies. Examples of these units are the polar carboranes (ortho- and meta-carborane), polar carboranes with electronegative and/or electropositive substitutes, and polar "buckminsterfullerenes."

3 Claims, 12 Drawing Figures

Government Interest

This invention was made with Government support under Contract N00019-88-C-0208 awarded by the Department of the Navy. The Government has certain rights in this invention.

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