Hollow microspheres

Details Hollow microspheres Hollow microspheres

1979-12-13

1981-12-01

Lindsay, Jr., Robert L.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

126450, 428403, 428407, 521 54, 521 57, 521136, B32B 516, B32B 900, B32B 1508

Patent

active

043037321

ABSTRACT:
Hollow glass microspheres made from a low heat conductivity glass composition containing a high vacuum and a thin metal coating deposited on the inner wall surface of the microspheres are described. The hollow glass microspheres are used to make superior insulation materials in the construction of highly efficient solar energy collectors.
The hollow glass microspheres can also be made to contain a thin transparent or reflective metal coating deposited on the inner wall surface of the microspheres by adding to the blowing gas small dispersed metal particles and/or gases of organo metal compounds and decomposing the organo metal compounds.
The hollow glass microspheres can be made from low heat conductivity glass compositions. The microspheres can be used to make improved insulation materials and composites and insulating systems.
The hollow glass microspheres can be used as filler materials in plastics, in plastic foam compositions and in concrete and asphalt compositions.
The hollow glass microspheres can also be made in the form of filamented glass microspheres with a thin glass filament connecting adjacent glass microspheres.

REFERENCES:
patent: 948541 (1910-02-01), Coleman
patent: 1871792 (1932-08-01), Horsfield
patent: 3186812 (1965-06-01), Pfaender
patent: 3325341 (1967-06-01), Shannon
patent: 3607169 (1971-09-01), Coxe
patent: 3615972 (1971-10-01), Morehouse et al.
patent: 3769770 (1973-11-01), Deschamps et al.
patent: 4033324 (1977-07-01), Eckels
Materials Engineering "Microspheres Cut Costs, Improve Properties of Plastics" pp. 58, 59 4-1975.
Chemical Engineering, "Microencapsulation" pp. 177, 178 12/1967.

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