초록 ▼

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 ce

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°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.

대표청구항 ▼

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 thermosett

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°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.