Solid electrolyte particles comprising MAg4I5

Details Solid electrolyte particles comprising MAg4I5 Solid electrolyte particles comprising MAg4I5

2000-05-23

2002-05-07

Lovering, Richard D. (Department: 1712)

Compositions

Electrolytes for electrical devices

C423S463000, C424S401000, C429S318000, C430S567000

Reexamination Certificate

active

06383405

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a composition comprising MAg
4
I
5
, wherein M is a monovalent cation, in the form of anisotropic crystalline particles; a process for preparing MAg
4
I
5
; an emulsion comprising MAg
4
I
5
in an organic solvent, a photothermographic element comprising an emulsion layer comprising MAg
4
I
5
in the form of anisotropic particles; and a method of forming a stable aqueous dispersion of MAg
4
I
5
.
BACKGROUND OF THE INVENTION
MAg
4
I
5
(wherein M is a monovalent cation) is a high ionic conductivity solid electrolyte. Conventional MAg
4
I
5
preparation methodology involves the dissolution of MI in molten AgI. Stoichiometric amounts of MI and AgI are ground then melted in an alumina crucible above 560° C., in flowing argon, then cooled to room temperature. The resulting ingot is then ground by ball milling for several hours to produce MAg
4
I
5
in powder form.
Commonly assigned, copending application Ser. No. 08/939,465, filed Sep. 29, 1997, now abandoned, discloses an AgI based photothermographic imaging system that utilizes the controlled decomposition of MAg
4
I
5
in acetone as the process to generate an imaging material. The MAg
4
I
5
reagent disclosed in the '465 application is generated by the above described conventional preparation methodology. This process requires high temperatures and numerous process steps. It would be desirable to produce the MAg
4
I
5
by a simpler method.
As discussed in the '465 application, MAg
4
I
5
can be used to generate light sensitive AgI for use in a photothermographic element. In preparing photothernographic elements as described in the '465 application, an organic solvent is used for forming the light sensitive imaging layer. It would be desirable to be able to use water as the solvent in preparing a photothermographic element. However, MAg
4
I
5
is unstable in water. It would be desirable to provide a stable aqueous composition containing MAg
4
I
5
.
PROBLEM TO BE SOLVED BY THE INVENTION
It is desirable to provide a simpler method of preparing MAg
4
I
5
without high-temperature processing or ball milling. It would also be desirable to prepare MAg
4
I
5
dispersed in an organic solvent medium, which may contain a binder, for use in preparing an imaging layer of a photothermographic element. It is also desirable to prepare MAg
4
I
5
in powder form which can be directly dispersed in an organic solvent. Further, it would be desirable to provide a stable aqueous composition comprising MAg
4
I
5
for a variety of uses including use in a photographic or photothermographic element.
SUMMARY OF THE INVENTION
One aspect of this invention comprises a composition comprising MAg
4
I
5
, wherein M is a monovalent cation, in the form of anisotropic crystalline particles.
Another aspect of this invention comprises a process for generating particles of MAg
4
I
5
, wherein M is a monovalent cation, which comprises dissolving AgI and MI in a polar solvent followed by precipitating particles of MAg
4
I
5
by adding the solution to a nonpolar solvent.
Yet another aspect of this invention comprises an emulsion comprising MAg
4
I
5
, wherein M is a monovalent cation, in an organic solvent.
Still another aspect of this invention comprises a photothermographic element containing at least one emulsion layer comprising MAg
4
I
5
, wherein M is a monovalent cation, in the form of anisotropic crystalline particles.
A further aspect of this invention comprises a method for preparing a stable aqueous emulsion of MAg
4
I
5
, wherein M is a monovalent cation, which method comprises forming a saturated solution of water and a solute and then adding MAg
4
I
5
to the saturated solution.
ADVANTAGEOUS EFFECT OF THE INVENTION
This invention provides:
(1) anisotropic crystalline particles of MAg
4
I
5
, where M is a monovalent cation;
(2) an alternative to high temperature processing to make MAg
4
I
5
, where is a monovalent cation;
(3) a method of precipitating MAg
4
I
5
, where M is a monovalent cation, articles in organic solvent;
(4) a method of forming fine particles of MAg
4
I
5
, where M is a monovalent cation, without ball milling;
(5) a procedure for stabilizing fine particles of MAg
4
I
5
, where M is a monovalent cation, in aqueous environments; and
(6) a photothermographic element containing anisotropic crystalline particles of MAg
4
I
5
.


REFERENCES:
patent: 3519404 (1970-07-01), Argue et al.
patent: 3708729 (1973-01-01), Berger
patent: 3719612 (1973-03-01), Johnston
patent: 3719746 (1973-03-01), Johnston
patent: 3870522 (1975-03-01), Moisar et al.
patent: 4002479 (1977-01-01), Susuki et al.
patent: 4094684 (1978-06-01), Maskasky
patent: 4147551 (1979-04-01), Finnicum et al.
patent: 4180402 (1979-12-01), Andreev et al.
patent: 4636461 (1987-01-01), Becker et al.
patent: 4692400 (1987-09-01), Kumashiro et al.
patent: 4879904 (1989-11-01), Shaw et al.
patent: 5244783 (1993-09-01), Chang
patent: 6120984 (2000-09-01), Blanton et al.
Co-pending application Ser. No. 08/939,465 (our Docket No. 72286) filed Sep. 29, 1997, entitled Photothermographic Elements, Inventors Dankosh et al.

Affiliated with

Also associated with

Rating

Solid electrolyte particles comprising MAg4I5 does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid electrolyte particles comprising MAg4I5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid electrolyte particles comprising MAg4I5 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2845794