Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...
Patent
1991-03-05
1992-11-17
Lovering, Richard D.
Plastic and nonmetallic article shaping or treating: processes
Encapsulating normally liquid material
Liquid encapsulation utilizing an emulsion or dispersion to...
264 43, 264 432, 264 433, 42840221, 503215, B01J 1316, B01J 1320
Patent
active
051641267
ABSTRACT:
An improved process for producing by interfacial reaction, a high solids an aqueous slurry of microcapsules is disclosed. Typical interfacial reaction involves the steps of emulsifying an oil phase containing the material to be encapsulated plus an oil-soluble, film-forming polyisocyanate in a continuous aqueous phase containing an emulsifying polymer under high shear conditions until the desired droplet size is obtained and then, under low shear conditions, adding a polyamine solution followed by an elevated temperature reaction sufficient to complete hardening of the polyurea capsule walls. The improvement of the invention comprising the introduction of a reaction period at elevated temperature between emulsification and polyamine addition, said reaction period permitting capsules of 10 microns or less average diameter to be made at greater than 40% by weight solids without agglomeration or resultant excess viscosity.
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Hayford Donald E.
Kalishek Robert J.
Appleton Papers Inc.
Lovering Richard D.
Mieliulis Benjamin
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