Patent US4058470A successfully refreshed from Google Patents.
US4058470A
Expired / Lapsed
US
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Liquid developer composition for lithographic masters
Assignee: AB Dick Co
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Filing: 1975-10-24
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Granted: 1977-11-15
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Expires: 1995-10-24
Abstract
Abstract A liquid developer for treatment to convert a latent electrostatic image to an ink receptive, water repellent, oleophilic image for use in the production of multiple copies by lithographic technique in which, in addition to the toner particles and organic solvent, the developer contains a polyvinyl acetate as a binder and a hydrophobic colloidal silica in the ratio of 1 part silica to 1.5 to 4 parts binder whereby the oleophilic properties of the image are markedly improved.
Inventors
- 👤 Elia P. Moschovis
- 👤 John L. Gilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:14
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/13; G03G9/131; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A liquid developer composition for treatment to convert a latent electrostatic image to one that is ink receptive, water repellent and hydrophobic for use in the production of multiple copies by lithographic techique, the improvement which, in addition to the ink receptive, water repellent, oleophilic toner particles and a liquid aliphatic organic solvent having a resistivity in excess of 10 10 ohms-cm consists essentially of the improvement wherein a resinous binder component is present which consists of a polyvinyl acetate resin and a hydrophobic colloidal silica present in combination with the polyvinyl acetate resin in the ratio of 1 part by weight of the hydrophobic colloidal silica to 1.5 to 4 parts by weight of the polyvinyl acetate.
Claim 2
Dependent Claim
118 words
A liquid developer composition for treatment to convert a latent electrostatic image to one that is ink receptive, water repellent and hydrophobic for use in the production of multiple copies by lithographic techique, the improvement which, in addition to the ink receptive, water repellent, oleophilic toner particles and a liquid aliphatic organic solvent having a resistivity in excess of 10 10 ohms-cm consists essentially of the improvement wherein a resinous binder component is present which consists of a polyvinyl acetate resin and a hydrophobic colloidal silica present in combination with the polyvinyl acetate resin in the ratio of 1 part by weight of the hydrophobic colloidal silica to 1.5 to 4 parts by weight of the polyvinyl acetate.
Claim 3
Dependent Claim
35 words
A liquid developer as claimed in Claim 1 in which the materials are present in the ratio of 1 part by weight of colloidal silica to 1 to 3 parts by weight of polyvinyl acetate.
Claim 4
Dependent Claim
27 words
A liquid developer as claimed in Claim 1 in which the polyvinyl acetate is present in an amount within the range of 0.02 to 1.0% by weight.
Claim 5
Dependent Claim
27 words
A liquid developer as claimed in Claim 1 in which the polyvinyl acetate is present in an amount within the range of 0.03 to 0.7% by weight.
Claim 6
Dependent Claim
28 words
A liquid developer as claimed in Claim 1 which contains in addition a rosin or rosinate in an amount within the range of 0.02 to 0.08% by weight.
Claim 7
Dependent Claim
26 words
A liquid developer as claimed in claim 1 which contains in addition a dispersant in an amount within the range of 0.0002 to 0.02% by weight.
Claim 8
Dependent Claim
36 words
A liquid developer as claimed in claim 1 which contains in addition an oil selected from the group consisting of a paraffin oil and a mineral oil present in an amount up to 0.02% by weight.
Claim 9
Dependent Claim
60 words
A liquid developer as claimed in claim 1 which includes in addition an amine derivative selected from the group consisting of an aliphatic amine containing 3 to 18 carbon atoms, an aromatic amine, and a heterocyclic amine, in which the amine derivative is present in an amount within the range of 0.0018 to 0.03% by weight of the developer composition.
Claim 10
Dependent Claim
56 words
A liquid developer as claimed in claim 1 which includes in addition an amine derivative selected from the group consisting of an aliphatic amine containing 3 to 18 carbon atoms, an aromatic amine, and a heterocyclic amine, in which the amine derivative is present in an amount within the range of 0.003 to 0.015% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |