Pressure-resistant microcapsules with a polyamide shell and a po

Details Pressure-resistant microcapsules with a polyamide shell and a po Pressure-resistant microcapsules with a polyamide shell and a po

1981-05-29

1983-10-11

Lovering, Richard D.

Drug, bio-affecting and body treating compositions

Solid synthetic organic polymer as designated organic active...

Polymer from ethylenic monomers only

8526, 71DIG1, 252522A, 264 41, 42840221, 521128, A61K 950, A61K 958, B01J 1302

Patent

active

044092016

ABSTRACT:
What are disclosed are pressure-resistant microcapsules comprising a polyamide shell having therein a structural mass of a polyurethane-polyurea polymer and an encapsulated water-immiscible liquid phase, and methods for making the same by dispersing a water-immiscible liquid phase in an aqueous phase and subsequently or simultaneously admixing therewith an aqueous solution of a diamine or polyamine, said dispersed phase comprising a polyamide forming acid compound, diisocyanate or polyisocyanate or a prepolymer thereof, and an inert organic aprotic hydrophilizing agent.

REFERENCES:
patent: 3429827 (1969-02-01), Ruus
patent: 3577515 (1971-05-01), Vandegaer
patent: 3639306 (1972-02-01), Sternberg et al.
patent: 3796669 (1974-03-01), Kiritani et al.
patent: 3812056 (1974-05-01), De La Torriente et al.
patent: 4309213 (1982-01-01), Graber et al.

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