Capsule manufacture

Details Capsule manufacture Capsule manufacture

1982-04-20

1984-04-24

Lovering, Richard D.

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

42840221, B01J 1302

Patent

active

044446993

ABSTRACT:
A process is disclosed for performing encapsulation, en masse, by an in situ polymerization reaction to yield capsule wall material. The polymerization comprises a reaction between melamine and formaldehyde and/or polycondensation of monomeric methylol melamine or etherified methylol melamine, or a low molecular weight polymer thereof, in an aqueous vehicle and the reaction is conducted in the presence of negatively-charged, carboxyl-substituted polyelectrolyte material and certain salts, both dissolved in the vehicle. The disclosed encapsulation process permits the manufacture of microcapsules with more impermeable walls and/or lower capsule batch viscosities.

REFERENCES:
patent: 2312693 (1943-03-01), D'Alelio
patent: 2653921 (1953-09-01), Sulzer
patent: 3928272 (1975-12-01), Brancato et al.
patent: 4100103 (1978-07-01), Foris et al.
patent: 4233178 (1980-11-01), Fuchigami
patent: 4251386 (1981-02-01), Saeki et al.

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