US4296016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a polymeric electrolyte particularly for an electro-optical device
Assignee: ETS SA A SWISS CORP
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Filing: 1980-04-02
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Granted: 1981-10-20
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Expires: 2000-04-02
Abstract
Abstract In preparing an electrolyte comprising a mixture of poly[2-acrylamido-2-methyl-propanesulfphonic acid] and water in which a pigment is distributed substantially homogeneously, monomer of the formula CH 2 ═CH--CO--NH--C(CH 3 ) 2 --CH 2 --SO 3 H is first dissolved in water with a pigment suspended in it. A polymerization initiator, such as 2,2'-azo-bisisobutyronitrile, is added to the mixture and the polymerization reaction is carried out with agitation, at a temperature in the range from room temperature to 60° C. Finally, part of the water is evaporated from the viscous mass obtained, to give the desired mix. The pigmented electrolyte may be used in electro-optical devices such as electrochromic display cells.
Inventors
- 👤 Jean-Paul Randin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1523; G02F1/1525; C; C08; C08F; C08F120/00; C08F120/02; C08F120/52; C08F120/54; C08F120/58
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A method of preparing a proton polymeric electrolyte, particularly for an electro-optical device, which is a mixture of poly[2-acrylamido-methylpropanesulphonic acid] and water and containing pigment distributed substantially homogeneously, comprising forming a suspension of a said pigment in water, dissolving 5 to 50% by weight of a monomer of the formula ##STR2## or a salt thereof in the suspension, adding a polymerisation initiator to the mixture, carrying out the polymerisation reaction with agitation, and evaporating part of the water until the water content is less than 52% of the weight of the dry polymer, the pigment being present in the amount of 2 to 25% by weight of the dry polymer.
Claim 2
Independent Claim
110 words
A method of preparing a proton polymeric electrolyte, particularly for an electro-optical device, which is a mixture of poly[2-acrylamido-methylpropanesulphonic acid] and water and containing pigment distributed substantially homogeneously, comprising forming a suspension of a said pigment in water, dissolving 5 to 50% by weight of a monomer of the formula ##STR2## or a salt thereof in the suspension, adding a polymerisation initiator to the mixture, carrying out the polymerisation reaction with agitation, and evaporating part of the water until the water content is less than 52% of the weight of the dry polymer, the pigment being present in the amount of 2 to 25% by weight of the dry polymer.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 in which the temperature for the polymerisation reaction is in the range from room temperature to 60° C.
Claim 4
Dependent Claim
14 words
A method as claimed in claim 1 in which the polymerisation initiator is 2,2'-azobisisobutyronitrile.
Claim 5
Dependent Claim
31 words
A method as claimed in claim 1 in which the mix is purged with an inert gas, at least during the stage when the monomer is being dissolved in the suspension.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 1 in which said pigment is titanium dioxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |