Metal-coated hollow microspheres
AssigneePaper Applications International, Inc.
InventorFrederick A. Wright
Life of this patent
Estimating the term…
Abstract
A process for preparing a metal-coated hollow microsphere comprising the combination of steps of: (a) vigorously admixing a major quantity of hollow cenospheres/microspheres with a thermo-setting binder adhesive until the cenospheres are wet-out; (b) slowly adding metal flakes to the thus wet-out cenospheres of step (a) until the wet-out cenospheres are fully coated with the metal flakes; (c) binding the metal flakes to the said wet-out cenospheres by slowly increasing the temperature of the metal coated wet-out cenospheres from step (b), the temperature being raised up to about 350.degree. F.; and (d) the metal-coated cenospheres of step (c) are intermittently admixed in the absence of any further heating until dry. The dry product is ready for packaging.
Claims20
A process for preparing metal-coated hollow microspheres comprising the combination of steps of:
- (a) vigorously admixing a major quantity of hollow microspheres with a thermosetting binder adhesive until said microspheres are wet-out, said hollow microspheres having an average particle size diameter ranging from about 60 microns to about 180 microns;
- (b) slowly adding metal flakes to the thus wet-out microspheres from step (a) until said wet-out microspheres are coated with said metal flakes;
- (c) applying heat and slowly increasing the temperature of the metal-coated microspheres from step (b) up to about 350.degree. F. to thereby cure said binder and bind said metal flakes to said microspheres;
- and
- (d) intermittently mixing-agitating the metal-coated microspheres from step (c) in the absence of any further heating until said metal-coated microspheres are dry.
A process for preparing metal-coated hollow microspheres comprising the combination of steps of:
- (a) vigorously admixing a major quantity of hollow microspheres having an average particle size diameter ranging from about 60 microns to about 180 microns with about 3 to about 6 weight percent, based on the weight of the final product, of a thermosetting binder adhesive comprising an organo functional silane and a copolymerizable monomer, until said microspheres are wet-out;
- (b) slowly adding metal flakes to the thus wet-out microspheres from step (a) until said wet-out microspheres are coated with said metal flakes, said metal flakes having an average particle size of about 6 microns to about 10 microns;
- (c) applying heat and slowly increasing the temperature of the metal-coated microspheres from step (b) up to about 350.degree. F. to thereby cure said binder and bind said metal flakes to said microspheres;
- and
- (d) intermittently mixing-agitating the metal-coated microspheres from step (c) in the absence of any futher heating, until said metal-coated microspheres are dry.
Metal-coated hollow microspheres obtained by:
- (a) vigorously admixing a major quantity of hollow microspheres having an average particle size diameter ranging from about 60 microns to about 180 microns, with about 3 to about 6 weight percent, based on the weight of the final product, of a thermosetting binder adhesive, said adhesive comprising an organo functional silane and a copolymerizable monomer, until said microspheres are wet-out;
- (b) adding metal flakes to the thus wet-out microspheres from step (a) until said wet-out microspheres are coated with said metal flakes, said metal flakes having an average particle size of about 2 microns to about 10 microns;
- (c) applying heat and slowly increasing the temperature of the metal-coated microspheres from step (b) until a temperature of up to about 350.degree. F. is reached to thereby cure said binder and bind said metal flakes to said microspheres;
- and
- (d) intermittently admixing-agitating the metal-coated microspheres from step (c) in the absence of further heating until said metal-coated micrspheres are dry after which said metal-coated microspheres are recovered as product.
Metal-coated hollow microspheres, comprising non-conductive hollow microspheres having an average particle size diameter ranging from about 60 microns to about 180 microns, metal flakes substantially coating individual said hollow microspheres, said metal flakes having an interior surface bound to an exterior surface of a hollow microspheres by a thermosetting binder adhesive.
Dependencies are inferred from the claim text.