Encapsulation process

Details Encapsulation process Encapsulation process

2000-11-27

2002-12-03

Acquah, Samuel A. (Department: 1711)

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

C428S402200, C428S402210, C428S402240, C428S206000, C106S031250, C106S031260, C106S031330, C106S031400, C524S801000, C264S004300, C264S004330

Reexamination Certificate

active

06488870

ABSTRACT:

BACKGROUND OF THE INVENTION
Microcapsules have a variety of uses. Various microencapsulation techniques are available to fabricate these microcapsules. New microcapsules and microencapsulation techniques are desired to expand the applications in which microencapsulation technology may be useful.
Conventional microcapsules and microencapsulation techniques are described in “Kirk-Othmer Encyclopedia of Chemical Technology,” Vol. 15, pp. 470-493 (3
rd
Edition 1981); Klaveness et al., U.S. Pat. No. 6,110,444; Jason et al., U.S. Pat. No. 5,540,927; Baker et al., U.S. Pat. No. 4,808,408.
The present microcapsules and microencapsulation technique may be used in the manufacture of components for display devices. Conventional display devices (some including microcapsules), components for display devices, and the manufacture of such display devices and their components are described in Sheridon, U.S. Pat. No. 5,604,027; Jacobson et al., U.S. Pat. No. 5,961,804; Jacobson et al., U.S. Pat. No. 5,930,026; Albert et al., U.S. Pat. No. 6,067,185; Crowley et al., U.S. Pat. No. 5,262,098; Sheridon, U.S. Pat. No. 5,344,594; and Stefik, U.S. Pat. No. 5,723,204.
SUMMARY OF THE INVENTION
The present invention is accomplished in embodiments by providing an encapsulation process comprising:
(a) forming an emulsion comprised of a continuous phase comprising a first liquid, a cationic material, and an anionic material, and a disperse phase comprising a plurality of droplets of a second liquid, wherein a number of the droplets includes therein one to five particles; and
(b) inducing complex coacervation of the cationic material and the anionic material to form a shell around each of the droplets.
There is also provided in embodiments an encapsulation process comprising:
(a) forming an emulsion comprised of a continuous phase comprising a first liquid, a cationic material, and an anionic material, and a disperse phase comprising a plurality of droplets of a second liquid, wherein a number of the droplets includes therein a single particle; and
(b) inducing complex coacervation of the cationic material and the anionic material to form a shell around each of the droplets.


REFERENCES:
patent: 4808408 (1989-02-01), Baker et al.
patent: 5262098 (1993-11-01), Crowley et al.
patent: 5344594 (1994-09-01), Sheridon
patent: 5540927 (1996-07-01), Jason et al.
patent: 5604027 (1997-02-01), Sheridon
patent: 5723204 (1998-03-01), Stefik
patent: 5930026 (1999-07-01), Jacobson et al.
patent: 5961804 (1999-10-01), Jacobson et al.
patent: 6067185 (2000-05-01), Albert et al.
patent: 6110444 (2000-08-01), Klaveness et al.
“Kirk-Othmer Encyclopedia of Chemical Technology,” vol. 15, pp. 470-493 (3rdEdition 1981).

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