US3980576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid toner compositions as used in development powders
Assignee: Pitney Bowes Inc
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Filing: 1975-01-10
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Granted: 1976-09-14
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Expires: 1995-01-10
Abstract
Abstract Developer powders are disclosed which use a resinous binder comprising a combination of thermoplastic resins based on a copolymer comprising a styrene and an acrylate or methacrylate selected from the group including butyl, isobutyl, ethyl, propyl and isopropyl, which copolymer is combined with vinyltoluene-butadiene. These developer powders have a melt index of 20 to 30, a melting point of 75°-100°C and a dielectric constant of 4 to 5.
Inventors
- 👤 Bheema Rao Vijayendran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:03
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08726; G03G9/08728; G03G9/08737
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
47 words
A solid toner for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a coloring agent, and b. a polymeric blend composed of 10-60% prepolymerized copolymer of vinyltoluene-butadiene and 40-90% of a prepolymerized copolymer selected from the group consisting of styrene-acrylate and styrene-methacrylate.
Claim 2
Dependent Claim
47 words
A solid toner for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a coloring agent, and b. a polymeric blend composed of 10-60% prepolymerized copolymer of vinyltoluene-butadiene and 40-90% of a prepolymerized copolymer selected from the group consisting of styrene-acrylate and styrene-methacrylate.
Claim 3
Dependent Claim
20 words
The solid toner of claim 1 wherein said coloring agent is selected from the group consisting of pigments and dyes.
Claim 4
Dependent Claim
13 words
The solid toner of claim 2 wherein said pigment is a carbon black.
Claim 5
Dependent Claim
17 words
The solid toner of claim 2 wherein the quantity of said coloring agent is 1 to 8%.
Claim 6
Dependent Claim
53 words
A solid toner for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a coloring agent, and b. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-methacrylates and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said methacrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 7
Dependent Claim
53 words
A solid toner for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a coloring agent, and b. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-methacrylates and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said methacrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 8
Dependent Claim
17 words
The solid toner of claim 5 wherein the quantity of coloring agent is 1-16% of the toner.
Claim 9
Dependent Claim
53 words
A solid toner for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a coloring agent, and b. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-acrylate and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said acrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 10
Dependent Claim
53 words
A solid toner for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a coloring agent, and b. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-acrylate and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said acrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 11
Dependent Claim
17 words
The solid toner of claim 7 wherein the quantity of coloring agent is 1-16% of the toner.
Claim 12
Dependent Claim
54 words
A development powder for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a solid triboelectrically chargeable carrier particle; b. a coloring agent, and c. a polymeric blend composed of 10-60% prepolymerized copolymer of vinyltoluene-butadiene and 40-90% of a prepolymerized copolymer selected from the group consisting of styrene-acrylate and styrene-methacrylate.
Claim 13
Dependent Claim
54 words
A development powder for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a solid triboelectrically chargeable carrier particle; b. a coloring agent, and c. a polymeric blend composed of 10-60% prepolymerized copolymer of vinyltoluene-butadiene and 40-90% of a prepolymerized copolymer selected from the group consisting of styrene-acrylate and styrene-methacrylate.
Claim 14
Dependent Claim
12 words
The development powder of claim 1 wherein said carrier particles are iron.
Claim 15
Dependent Claim
20 words
The solid toner of claim 1 wherein said coloring agent is selected from the group consisting of pigments and dyes.
Claim 16
Dependent Claim
13 words
The solid toner of claim 2 wherein said pigment is a carbon black.
Claim 17
Dependent Claim
66 words
A development powder for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a solid triboelectrically chargeable carrier particle; and b. a solid toner comprising: 1. a coloring agent, and 2. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-methacrylate and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said methacrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 18
Dependent Claim
66 words
A development powder for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a solid triboelectrically chargeable carrier particle; and b. a solid toner comprising: 1. a coloring agent, and 2. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-methacrylate and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said methacrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 19
Dependent Claim
20 words
The development powder of claim 13 wherein the quantity of said solid toner is 0.5 to 5% of the powder.
Claim 20
Dependent Claim
16 words
The development powder of claim 14 wherein said coloring agent comprises 1-16% of said solid toner.
Claim 21
Dependent Claim
65 words
A development powder for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a solid triboelectrically chargeable carrier particle; b. a solid toner comprising: 1. a coloring agent, and 2. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-acrylate and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said acrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 22
Dependent Claim
65 words
A development powder for use in electrostatic printing to develop latent electrostatic images, the combination comprising: a. a solid triboelectrically chargeable carrier particle; b. a solid toner comprising: 1. a coloring agent, and 2. a polymeric blend composed of 40-90% prepolymerized copolymer of styrene-acrylate and 10-60% prepolymerized copolymer of vinyltoluene-butadiene, said acrylate being selected from the group consisting of butyl, isobutyl, ethyl, propyl and isopropyl.
Claim 23
Dependent Claim
19 words
The development of claim 16 wherein the quantity of said solid toner is 0.5 to 5% of the powder.
Claim 24
Dependent Claim
16 words
The development powder of claim 17 wherein said coloring agent comprises 1-16% of said solid toner.
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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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |