US4486524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing electrostatic latent images comprising a resin having specified molecular weight parameters
Assignee: Konica Minolta Inc
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Filing: 1981-11-13
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Granted: 1984-12-04
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Expires: 2001-11-13
Abstract
Abstract The present application relates to a novel toner for developing electrostatic latent images. The toner contains a colorant and a resin wherein the resin contains at least one particular type of polymer which has a Mw/Mn ratio of from 3.5 to 40 wherein the Mn value is about between 2,000 and 30,000.
Inventors
- 👤 Yasuyuki Fujisaki
- 👤 Minoru Takahashi
- 👤 Hiroshi Ogawara
- 👤 Hirozo Funaki
- 👤 Ryubun Seimaya
- 👤 Yutaka Yamada
- 👤 Makoto Tomono
- 👤 Noriyoshi Tarumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:24
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A toner for developing electrostatic latent images which comprises a resin, said resin containing at least 60% by weight, based on the weight of said resin, of at least one polymer selected from the group consisting of (a) a copolymer of an aromatic vinyl monomer with at least one other α-methylene aliphatic monocarboxylic acid ester and (b) a copolymer of β-Methylene aliphatic monocarboxylic acid ester, said polymer having a weight average molecular weight (Mw)/number average molecular weight (Mn) ratio of from 3.5 to 40 wherein the number average molecular weight (Mn) is between about 2,000 and about 30,000.
Claim 2
Dependent Claim
98 words
A toner for developing electrostatic latent images which comprises a resin, said resin containing at least 60% by weight, based on the weight of said resin, of at least one polymer selected from the group consisting of (a) a copolymer of an aromatic vinyl monomer with at least one other α-methylene aliphatic monocarboxylic acid ester and (b) a copolymer of β-Methylene aliphatic monocarboxylic acid ester, said polymer having a weight average molecular weight (Mw)/number average molecular weight (Mn) ratio of from 3.5 to 40 wherein the number average molecular weight (Mn) is between about 2,000 and about 30,000.
Claim 3
Dependent Claim
16 words
The toner of claim 1, wherein said Mw/Mn ratio is between about 4.0 and about 30.
Claim 4
Dependent Claim
20 words
The toner of claim 1, wherein said polymer has a softening point of from about 100° to about 170° C.
Claim 5
Dependent Claim
13 words
The toner of claim 1, wherein said aromatic vinyl monomer is a styrene.
Claim 6
Dependent Claim
12 words
The toner of claim 4, wherein said aromatic vinyl monomer is styrene.
Claim 7
Dependent Claim
32 words
The toner of claim 1, wherein said -methylene aliphatic monocarboxylic acid ester is at least one monomer selected from the group consisting of an acrylic acid ester and a methacrylic acid ester.
Claim 8
Dependent Claim
20 words
The toner of claim 1, wherein said polymer has a glass transformation point of about 20° to about 120° C.
Claim 9
Dependent Claim
17 words
The toner of claim 1, wherein said copolymer is at least 30 mole % aromatic vinyl monomers.
Claim 10
Dependent Claim
9 words
The toner of claim 1 further comprising a colorant.
Claim 11
Dependent Claim
11 words
The toner of claim 9, wherein said colorant is carbon black.
Claim 12
Dependent Claim
94 words
A toner for developing electrostatic latent images which comprises a resin, said resin containing at least 60% by weight, based on the weight of said resin, of at least one polymer selected from the group consisting of polystyrene, styrene-butyl methacrylate copolymers, methyl methacylate-butyl methacrylate copolymers, styrene-vinyl toluene copolymers, styrene-acrylonitrile copolymers, styrene-ethylhexyl acrylate copolymers, styrene-lauryl methacrylate copolymers and styrene-methyl methacrylate-butyl methacrylate copolymers, said polymer having a weight average molecular weight (Mw)/number average molecular weight (Mn) ratio of from 3.5 to 40 wherein the number average molecular weight (Mn) is between about 2,000 and about 30,000.
Claim 13
Dependent Claim
94 words
A toner for developing electrostatic latent images which comprises a resin, said resin containing at least 60% by weight, based on the weight of said resin, of at least one polymer selected from the group consisting of polystyrene, styrene-butyl methacrylate copolymers, methyl methacylate-butyl methacrylate copolymers, styrene-vinyl toluene copolymers, styrene-acrylonitrile copolymers, styrene-ethylhexyl acrylate copolymers, styrene-lauryl methacrylate copolymers and styrene-methyl methacrylate-butyl methacrylate copolymers, said polymer having a weight average molecular weight (Mw)/number average molecular weight (Mn) ratio of from 3.5 to 40 wherein the number average molecular weight (Mn) is between about 2,000 and about 30,000.
Claim 14
Dependent Claim
74 words
A toner for developing electrostatic latent images which comprises a resin, said resin containing at least 60% by weight, based on the weight of said resin, of at least one polymer selected from the group consisting of styrene-methyl methacrylate-butyl methacrylate copolymers, said polymer having a weight average molecular weight (Mw)/number average molecular weight (Mn) ratio of from 3.5 to 40 wherein the number average molecular weight (Mn) is between about 2,000 and about 30,000.
Claim 15
Dependent Claim
74 words
A toner for developing electrostatic latent images which comprises a resin, said resin containing at least 60% by weight, based on the weight of said resin, of at least one polymer selected from the group consisting of styrene-methyl methacrylate-butyl methacrylate copolymers, said polymer having a weight average molecular weight (Mw)/number average molecular weight (Mn) ratio of from 3.5 to 40 wherein the number average molecular weight (Mn) is between about 2,000 and about 30,000.
References Cited (Backward Citations)
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JPS49101032A
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |