Patent US3976583A successfully refreshed from Google Patents.
US3976583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic developer liquid
Assignee: Hoechst AG
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Filing: 1973-12-19
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Granted: 1976-08-24
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Expires: 1993-12-19
Abstract
Abstract This invention relates to an electrophotographic developer liquid comprising a dispersion of a colored, viscous solution of polymers containing about 0.01 to 10 per cent by weight of water, calculated on the weight of polymers present, in an electrically insulating carrier liquid having a kauri-butanol value of less than about 30 and in which at least one of the polymers is sparingly soluble. The invention also relates to a process for the preparation of the novel electrophotographic developer liquid.
Inventors
- 👤 Heinz Herrmann
- 👤 Alfred Brechlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:00
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/125; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
An electrophotographic liquid dispersion developer for transferring a developed charge image from a photoconductor onto a paper comprising an electrically insulating carrier liquid, having a kauri-butanol value of less than about 30, in which is dispersed a solution containing a. a solvent organic liquid, which is miscible with the carrier liquid, b. a copolymer (A) of vinyl toluene or styrene with an acrylic acid ester which is soluble in the solvent and substantially insoluble in the carrier liquid, c. a copolymer (B) of butadiene with styrene, which is soluble in the solvent and in the carrier liquid, said copolymers (A) and (B) being present in an amount between about 30 and 70 percent by weight, calculated on the weight of solvent, d. a coloring material substantially insoluble in the carrier liquid, and e. water in an amount of about 0.01 to 10 percent by weight, calculated on the weight of copolymers A and B present.
Claim 2
Dependent Claim
155 words
An electrophotographic liquid dispersion developer for transferring a developed charge image from a photoconductor onto a paper comprising an electrically insulating carrier liquid, having a kauri-butanol value of less than about 30, in which is dispersed a solution containing a. a solvent organic liquid, which is miscible with the carrier liquid, b. a copolymer (A) of vinyl toluene or styrene with an acrylic acid ester which is soluble in the solvent and substantially insoluble in the carrier liquid, c. a copolymer (B) of butadiene with styrene, which is soluble in the solvent and in the carrier liquid, said copolymers (A) and (B) being present in an amount between about 30 and 70 percent by weight, calculated on the weight of solvent, d. a coloring material substantially insoluble in the carrier liquid, and e. water in an amount of about 0.01 to 10 percent by weight, calculated on the weight of copolymers A and B present.
Claim 3
Dependent Claim
33 words
A liquid dispersion developer according to claim 1 in which the amount of water is about 0.1 to about 2 percent by weight, calculated on the weight of copolymers A and B present.
Claim 4
Dependent Claim
26 words
A liquid dispersion developer according to claim 1 in which copolymer (B) is a copolymer consisting of 75 percent of butadiene and 25 percent of styrene.
Claim 5
Dependent Claim
159 words
A process for the preparation of an electrophotographic liquid dispersion developer for transferring a developed charge image from a photoconductor layer onto paper comprising dispersing in an electrically insulating carrier liquid having a kauri-butanol value of less than about 30, a solution containing a. a solvent organic liquid, which is miscible with the carrier liquid, b. a copolymer (A) of vinyl toluene or styrene with an acrylic acid ester, which is soluble in the solvent and substantially insoluble in the carrier liquid, c. a copolymer (B) of butadiene with styrene, which is soluble in the solvent and in the carrier liquid, said copolymers (A) and (B) being present in an amount between about 30 and 70 percent by weight, calculated on the weight of solvent, d. a coloring material substantially insoluble in the carrier liquid, and e. water in an amount of about 0.01 to 10 percent by weight, calculated on the weight of copolymers A and B present.
Claim 6
Dependent Claim
159 words
A process for the preparation of an electrophotographic liquid dispersion developer for transferring a developed charge image from a photoconductor layer onto paper comprising dispersing in an electrically insulating carrier liquid having a kauri-butanol value of less than about 30, a solution containing a. a solvent organic liquid, which is miscible with the carrier liquid, b. a copolymer (A) of vinyl toluene or styrene with an acrylic acid ester, which is soluble in the solvent and substantially insoluble in the carrier liquid, c. a copolymer (B) of butadiene with styrene, which is soluble in the solvent and in the carrier liquid, said copolymers (A) and (B) being present in an amount between about 30 and 70 percent by weight, calculated on the weight of solvent, d. a coloring material substantially insoluble in the carrier liquid, and e. water in an amount of about 0.01 to 10 percent by weight, calculated on the weight of copolymers A and B present.
Claim 7
Dependent Claim
31 words
A process according to claim 4 in which the amount of water is about 0.1 to about 2 percent by weight, calculated on the weight of copolymers A and B present.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |