Compositions – Solids with solution or dispersion aids
Patent
1994-04-12
1996-07-02
Lovering, Richard D.
Compositions
Solids with solution or dispersion aids
75255, 102334, 252305, 252587, 342 3, 428403, C09K 300, B22F 102, B32B 1502
Patent
active
055319300
ABSTRACT:
Infrared, visible or mm. radiation is screened by an aerosol comprising flakes (0.03-0.3.times.1.5-20 microns) of aluminum metal composition, having a mass extinction coefficient of at least 4.5 m.sup.2 /g in respect of infrared radiation and at least 3.5 m.sup.2 /g in respect of visible radiation. The invention includes also the flakes per se, and formulations containing them, the flakes being additionally characterized by the facts that the amount of manufacturing process additive with which they are coated has been reduced to between 0 and 2.5 weight percent, and that they have a bulk density at least 0.5, preferably at least 1.5 g/cc. The reduction in the coating additive may be achieved by modifying the amount of additive used in the manufacturing process, or by treating the conventionally manufactured flakes with solvents to reduce the amount of coating additive to the desired level. Compressing the thus-treated flakes increases bulk density, with no significant reduction in the mass extinction coefficient.
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Karton Yishai
Kleiman Moshe
Israel Institute for Biological Research
Lovering Richard D.
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