EP0206606A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid developer for electrostatic latent image
Assignee: Toray Industries Inc
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Filing: 1986-06-09
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Granted: —
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Expires: 2006-06-09
Abstract
Abstract The present invention relates to a liquid developer for electrostatic latent image, comprising the following components (a), (b) and (c) which are dispersed in an electrical resistive aliphatic hydrocarbon solvent: (a) a non-gel copolymer which as a whole is insoluble in the solvent and which consists essentially of a copolymer segment soluble in the solvent and a polymer segment insoluble in the solvent, the solvent-soluble copolymer segment containing as main monomer components an alkyl acrylate or an alkyl methacrylate and a cycloalkyl acrylate or a cycloalkyl methacrylate and/or an aralkyl acrylate or an aralkyl methacrylate, and the solvent-insoluble polymer segment containing vinyl acetate as a main monomer component; (b) a coloring agent; and (c) a dispersant. The liquid developer for electrostatic latent image of the present invention does not change in print density and is used effectively in electrophotography, for example, in wet copiers and printers, and in electrostatography, for example, in facsimile and electrostatic plotters. Particularly, it is suitable for multicolor printing.
Inventors
- 👤 Tsuneyuki Kondo
- 👤 Yasuhiro Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 19:44
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/133; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
125 words
A liquid developer for electrostatic latent image, comprising the following components (a), (b) and (c) which are dispersed in an electrical resistive aliphatic hydrocarbon solvent: (a) a non-gel copolymer which as a whole is insoluble in said solvent and which consists essentially of a copolymer segment soluble in said solvent and a polymer segment insoluble in said solvent, said solvent-soluble copolymer segment containing as main monomer components (i) at least one monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates and (ii) at least one monomer selected from the group consisting of cycloalkyl acrylates, cycloalkyl methacrylates, aralkyl acrylates and aralkyl methacrylates; and said solvent-insoluble polymer segment containing vinyl acetate as a main monomer component; (b) a coloring agent; and (c) a dispersant.
Claim 2
Dependent Claim
125 words
A liquid developer for electrostatic latent image, comprising the following components (a), (b) and (c) which are dispersed in an electrical resistive aliphatic hydrocarbon solvent: (a) a non-gel copolymer which as a whole is insoluble in said solvent and which consists essentially of a copolymer segment soluble in said solvent and a polymer segment insoluble in said solvent, said solvent-soluble copolymer segment containing as main monomer components (i) at least one monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates and (ii) at least one monomer selected from the group consisting of cycloalkyl acrylates, cycloalkyl methacrylates, aralkyl acrylates and aralkyl methacrylates; and said solvent-insoluble polymer segment containing vinyl acetate as a main monomer component; (b) a coloring agent; and (c) a dispersant.
Claim 3
Dependent Claim
127 words
A liquid developer for electrostatic latent image for multicolor printing, comprising the following components (a), (b) and (c) which are dispersed in an electrical resistive aliphatic hydrocarbon solvent: (a) a non-gel copolymer which as a whole is insoluble in said solvent and which consists essentially of a copolymer segment soluble in said solvent and a polymer segment insoluble in said solvent, said solvent-soluble copolymer segment containing as main monomer components (i) at least one monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates and (ii) at least one monomer selected from the group consisting of cycloalkyl acrylates, cycloalkyl methacrylates, aralkyl acrylates and aralkyl methacrylates; and said solvent-insoluble polymer segment containing vinyl acetate as a main component; (b) a coloring agent; and (c) a dispersant.
Claim 4
Dependent Claim
127 words
A liquid developer for electrostatic latent image for multicolor printing, comprising the following components (a), (b) and (c) which are dispersed in an electrical resistive aliphatic hydrocarbon solvent: (a) a non-gel copolymer which as a whole is insoluble in said solvent and which consists essentially of a copolymer segment soluble in said solvent and a polymer segment insoluble in said solvent, said solvent-soluble copolymer segment containing as main monomer components (i) at least one monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates and (ii) at least one monomer selected from the group consisting of cycloalkyl acrylates, cycloalkyl methacrylates, aralkyl acrylates and aralkyl methacrylates; and said solvent-insoluble polymer segment containing vinyl acetate as a main component; (b) a coloring agent; and (c) a dispersant.
Claim 5
Dependent Claim
51 words
A liquid developer as set forth in Claim 1 or Claim 2, wherein said electrical resistive aliphatic hydrocarbon solvent is an aliphatic hydrocarbon having an electrical resistivity not smaller than 10 9 n.cm, a dielectric constant not larger than 3 and a boiling point in the range of 68° to 250°C.
Claim 6
Dependent Claim
30 words
A liquid developer as set forth in any preceding claim, wherein said aliphatic hydrocarbon solvent is an aliphatic hydrocarbon having a boiling point in the range of 100° to 200°C.
Claim 7
Dependent Claim
36 words
A liquid developer as set forth in any preceding claim, wherein said non-gel copolymer which as a whole is insoluble in said solvent has a weight average molecular weight in the range of 5,000 to 50,000.
Claim 8
Dependent Claim
33 words
A liquid developer as set forth in any preceding claim, wherein said solvent-soluble copolymer segment and said solvent-insoluble polymer segment are in the proportions of 25-60% by weight and 75-40% by weight, respectively.
Claim 9
Dependent Claim
82 words
A liquid developer as set forth in any preceding claim, wherein said solvent-soluble copolymer segment consists essentially of : (i) at least one monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates; (ii) at least one monomer selected from the group consisting of cycloalkyl acrylates, cycloalkyl methacrylates, aralkyl acrylates and aralkyl methacrylates; and (iii) another vinyl compound, said components (i), (ii) and (iii) being in the proportions of 40-80% by weight, 20-60% by weight and 0-20% by weight, respectively.
Claim 10
Dependent Claim
55 words
A liquid developer as set forth in any one of Claims 1 to 6, wherein said solvent-soluble copolymer segment consists essentially of: (A) at least one monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates; and (B) at least one monomer selected from the group consisting of cycloalkyl acrylates and cycloalkyl methacrylates.
Claim 11
Dependent Claim
23 words
Liquid developer as set forth in any preceding claim, wherein the alkyl group in said component (i) has 3 to 20 carbon atoms.
Claim 12
Dependent Claim
20 words
A liquid developer as set forth in any preceding claim, wherein said component (ii) is cyclohexyl acrylate or cyclohexyl methacrylate.
Claim 13
Dependent Claim
24 words
A liquid developer as set forth in any one of Claims 1 to 9, wherein said component (ii) is benzyl acrylate or benzyl methacrylate.
Claim 14
Dependent Claim
30 words
A liquid developer as set forth in any preceding claim, wherein the vinyl acetate content of said solvent-insoluble polymer segment is in the range of 50 to 100% by weight.
Claim 15
Dependent Claim
43 words
A liquid developer as set forth in Claim 12, wherein said solvent-insoluble polymer segment is a copolymer of vinyl acetate with at least one monomer selected from alkyl acrylates and alkyl methacrylates, the vinyl acetate content being not less than 50% by weight.
Claim 16
Dependent Claim
26 words
A liquid developer as set forth in Claim 13, wherein the alkyl group of said alkyl acrylates or alkyl methacrylates has 1 to 20 carbon atoms.
Claim 17
Dependent Claim
31 words
A liquid developer as set forth in any preceding claim wherein said dispersant is at least one member selected from the group consisting of metal naphthenates, metal octylates and metal stearates.
Claim 18
Dependent Claim
15 words
A liquid developer as set forth in Claim 15, wherein said dispersant is aluminum stearate.
Claim 19
Dependent Claim
21 words
A liquid developer as set forth in Claim 1, said developer being for electrostatic latent image obtained by an electrostatic plotter.
Claim 20
Dependent Claim
23 words
A liquid developer as set forth in any preceding claim, said developer being for electrostatic latent image obtained by a color electrostatic plotter.
References Cited (Backward Citations)
No citation records indexed.
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