Patent US3933665A successfully refreshed from Google Patents.
US3933665A
Expired / Lapsed
US
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Manufacture of an electrostatic toner material
Assignee: Agfa Gevaert NV
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Filing: 1974-01-18
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Granted: 1976-01-20
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Expires: 1994-01-18
Abstract
Abstract An electrostatic toner material for use in electrophotography consisting essentially of finely divided particles formed of a generally uniform mixture comprised of 5 to 15 % by weight of a colored material and 95 to 85 % by weight of resin mixture consisting essentially of: A. 40 to 60 % by weight of a polymer having at least 50% of the recurring units thereof constituted by at least one styrene monomer of the formula: ##EQU1## wherein R is hydrogen or methyl, and the balance of such recurring units derived from at least one alkyl methacrylate monomer wherein alkyl comprises 1-4 carbon atoms, B. 20 to 40 % by weight of a homopolymer of butyl acrylate or butyl methacrylate, or copolymers thereof with up to 80 % by weight of methyl acrylate or methyl methacrylate, and C. 5 to 20 % by weight of a polymeric plasticizer selected from polyvinyl butyral, polyethylene and co(vinyl acetate/ethylene). The electrostatic toner material consists of particles having a diameter between 1 and 30 microns.
Inventors
- 👤 Jozef Leonard Van Engeland
- 👤 Noel Jozef De Volder
- 👤 Daniel Maurice Timmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:49
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1132; G03G9/1137; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08726; G03G9/08728; G03G9/1135; G03G9/1136
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
163 words
A particulate composition of matter adapted for developing electrostatic images consisting essentially of finely divided particles comprising by weight 5 to 15 % of a colored material and 95 to 85 % of a resin mixture consisting essentially of: A. 40 to 60 % by weight of a polymer having about 50 % of the recurring units thereof derived from at least one styrene monomer of the formula: ##EQU6## wherein: R is hydrogen or methyl, and the balance of such recurring units derived from at least one alkyl methacrylate monomer wherein alkyl comprises 1-4 carbon atoms, B. 20 to 40 % by weight of a homopolymer of butyl acrylate or butyl methacrylate or a copolymer of butyl acrylate or butyl methacrylate with up to 80 % by weight of methyl acrylate or methyl methacrylate, and C. 5 to 20 % by weight of a polymeric plasticizer selected from polyvinyl butyral, polyethylene and co(vinylacetate/ethylene), said particles having a diameter between 1 and 30 microns.
Claim 2
Dependent Claim
163 words
A particulate composition of matter adapted for developing electrostatic images consisting essentially of finely divided particles comprising by weight 5 to 15 % of a colored material and 95 to 85 % of a resin mixture consisting essentially of: A. 40 to 60 % by weight of a polymer having about 50 % of the recurring units thereof derived from at least one styrene monomer of the formula: ##EQU6## wherein: R is hydrogen or methyl, and the balance of such recurring units derived from at least one alkyl methacrylate monomer wherein alkyl comprises 1-4 carbon atoms, B. 20 to 40 % by weight of a homopolymer of butyl acrylate or butyl methacrylate or a copolymer of butyl acrylate or butyl methacrylate with up to 80 % by weight of methyl acrylate or methyl methacrylate, and C. 5 to 20 % by weight of a polymeric plasticizer selected from polyvinyl butyral, polyethylene and co(vinylacetate/ethylene), said particles having a diameter between 1 and 30 microns.
Claim 3
Dependent Claim
14 words
A particulate composition of matter according to claim 1, wherein resin (A) is polystyrene.
Claim 4
Dependent Claim
62 words
A particulate composition of matter according to claim 1, wherein resin (A) comprises 50 to 60 % by weight of recurring units deriving from at least one styrene monomer of the formula: ##EQU7## wherein: R is hydrogen or methyl, and 50 to 40 % by weight of at least one alkyl methacrylate, wherein the alkyl group comprises 1 to 4 carbon atoms.
Claim 5
Dependent Claim
20 words
A particulate composition of matter according to claim 3, wherein resin (A) is a copolymer of styrene and isobutyl methacrylate.
Claim 6
Dependent Claim
22 words
A particulate composition of matter according to claim 3, wherein resin (A) is a copolymer of styrene, α-methyl styrene and isobutyl methacrylate.
Claim 7
Dependent Claim
18 words
A particulate composition of matter according to claim 1, wherein resin (B) is a homopolymer of n-butyl methacrylate.
Claim 8
Dependent Claim
28 words
A particulate composition of matter according to claim 1, wherein resin (B) is a copolymer of n-butyl methacrylate with up to 80 % by weight of methyl methacrylate.
Claim 9
Dependent Claim
29 words
A particulate composition of matter according to claim 1, wherein resin (B) is a copolymer of n-butyl methacrylate and methyl methacrylate in a ratio of 25-75 % by weight.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |