US4797344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated toner having shell with first vinyl polymer with Mn of 2000-225000 and second vinyl polymer with Mn of 1000-15000
Assignee: Canon Inc
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Filing: 1986-09-24
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Granted: 1989-01-10
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Expires: 2006-09-24
Abstract
Abstract An encapsulated toner is provided by coating core particles with an outer shell. The outer shell comprises, as predominant components thereof, vinyl polymers A and B of different molecular weights. More specifically, the ratio of the number-average molecular weight of the vinyl polymer A (Mn A ) to that of the vinyl polymer B (Mn B ) is in the range of 2 to 15. The vinyl polymers A and B respectively have a ratio of weight-average molecular weight to number-average molecular weight of 5 or less. Because of these specific molecular weight characteristics of the shell-constituting polymers, the durability and triboelectric charging characteristics of the encapsulated toner are improved. These effects are enhanced particularly when inorganic fine particles are attached to embedded in the surface or surface layer of the core particles.
Inventors
- 👤 Toshiaki Nakahara
- 👤 Ichiro Ohsaki
- 👤 Hisayuki Ushiyama
- 👤 Masashi Kiuchi
- 👤 Masuo Yamazaki
- 👤 Yasuhide Goseki
- 👤 Hisayuki Ochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:01
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726; G03G9/08728; G03G9/093; G03G9/09307; G03G9/09314; G03G9/09321; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
164 words
An encapsulaed toner for developing electrostatic images, comprising microcapsules comprising: a core particle and an outer shell coating the core particle; the outer shell comprising a mixture having predominant components of a vinyl polymer A comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 2,000-225,000 and a vinyl polymer B comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 1,000-15,000 of different number-average molecular weights; the ratio of the number-average molecular weight of the vinyl polymer A (Mn A ) to that of the vinyl polymer B (Mn B ) being in the range of 2 to 15; the vinyl polymers A and B respectively having a ratio of weight-average molecular weight to number-average molecular weight of 5 or less and the weight ratio of the vinyl polymer A to the vinyl polymer B being in the range of 1:4 to 10:1.
Claim 2
Dependent Claim
164 words
An encapsulaed toner for developing electrostatic images, comprising microcapsules comprising: a core particle and an outer shell coating the core particle; the outer shell comprising a mixture having predominant components of a vinyl polymer A comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 2,000-225,000 and a vinyl polymer B comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 1,000-15,000 of different number-average molecular weights; the ratio of the number-average molecular weight of the vinyl polymer A (Mn A ) to that of the vinyl polymer B (Mn B ) being in the range of 2 to 15; the vinyl polymers A and B respectively having a ratio of weight-average molecular weight to number-average molecular weight of 5 or less and the weight ratio of the vinyl polymer A to the vinyl polymer B being in the range of 1:4 to 10:1.
Claim 3
Dependent Claim
31 words
The encapsulated toner according to claim 1, wherein said copolymer has a copolymerization ratio of the styrene monomer to the tertiary amino groupcontaining monomer in the range of 1:0.01 to 1:0.5.
Claim 4
Dependent Claim
22 words
The encapsulated toner according to claim 1, wherein the ratio Mn A /Mn B is in the range of 3 to 10.
Claim 5
Dependent Claim
29 words
The encapsulated toner according to claim 1, wherein said core particle comprises inorganic fine particles attached to or embedded in the surface or surface layer of the core particles.
Claim 6
Dependent Claim
31 words
The encapsulated toner according to claim 4, wherein said inorganic fine particles have a specific surface area of 50-400 m 2 /g according to the BET method by N 2 adsorption.
Claim 7
Dependent Claim
16 words
The encapsulated toner according to claim 5, wherein said inorganic fine particles are silica fine particles.
Claim 8
Dependent Claim
24 words
The encapsulated toner according to claim 1, wherein said core particle comprises a soft solid material showing pressure-fixability, and a colorant or magnetic powder.
Claim 9
Dependent Claim
18 words
The encapsulated toner according to claim 7, wherein said core particle has a volume-average particle size of 5-20μ.
Claim 10
Dependent Claim
15 words
The encapsulated toner according to claim 7, wherein said soft solid material comprises a wax.
Claim 11
Dependent Claim
24 words
The encapsulated toner according to claim 7, wherein said soft solid material comprises a reaction product between an amino group-containing monomer and a wax.
Claim 12
Dependent Claim
21 words
The encapsulated toner according to claim 10, wherein said amino group-containing monomer is dimethylaminoethyl methacrylate, and said wax is paraffin wax.
Claim 13
Dependent Claim
27 words
The encapsulated toner according to claim 1, wherein said outer shell comprises the vinyl polymers A and B in a proportion of 60 wt. % or more.
Claim 14
Dependent Claim
62 words
The encapsulated toner according to claim 1, wherein said core particle comprises inorganic fine particles attached to or embedded in the surface or surface layer of the core particle, said outer shell comprises the vinyl polymers A and B in a proportion of 60 wt. % or more, and said outer shell has been formed by phase separation from an organic phase.
Claim 15
Dependent Claim
28 words
The encapsulated toner according to claim 13, wherein said core particle comprises a reaction product between paraffin wax and dimethylaminoethyl methacrylate, polyethylene wax, paraffin wax and carnauba wax.
Claim 16
Dependent Claim
31 words
The encapsulated toner according to claim 14, wherein said core particle has been coated with the outer shell comprising the vinyl polymers A and B respectively comprising a styrene-dimethylaminoethyl methacrylate copolymer.
Claim 17
Dependent Claim
19 words
The encapsulated toner according to claim 1, wherein the vinyl polymer A has a number-average molecular weight of 4,000-100,000.
Claim 18
Dependent Claim
19 words
The encapsulated toner according to claim 16, wherein the vinyl polymer A has a number-average molecular weight of 15,000-30,000.
Claim 19
Dependent Claim
19 words
The encapsulated toner according to claim 1, wherein the vinyl polymer B has a number-average molecular weight of 3,500-15,000.
Claim 20
Dependent Claim
19 words
The encapsulated toner according to claim 18, wherein the vinyl polymer B has a number-average molecular weight of 3,000-12,000.
Claim 21
Dependent Claim
180 words
A process for producing an encapsulated toner, comprising: dissolving, in an organic solvent, a shell material comprising a mixture having predominant components of a vinyl polymer A comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 2,000-225,000 and a vinyl polymer B comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 1,000-15,000 of different number-average molecular weights; the ratio of the number-average molecular weight of the vinyl polymer A (Mn A ) to that of the vinyl polymer B (Mn B ) being in the range of 2 to 15; the vinyl polymers A and B respectively having a ratio of weight-average molecular weight to number-average molecular weight of 5 or less and the weight ratio of the vinyl polymer A to the vinyl polymer B being in the range of 1:4 to 10:1, dispersing solid core particles in the resulting organic solution, and subjecting the resulting dispersion to phase separation in order to obtain the encapsulated toner.
Claim 22
Dependent Claim
180 words
A process for producing an encapsulated toner, comprising: dissolving, in an organic solvent, a shell material comprising a mixture having predominant components of a vinyl polymer A comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 2,000-225,000 and a vinyl polymer B comprising a copolymer of a styrene monomer and a tertiary amino group-containing vinyl monomer having a number-average molecular weight of 1,000-15,000 of different number-average molecular weights; the ratio of the number-average molecular weight of the vinyl polymer A (Mn A ) to that of the vinyl polymer B (Mn B ) being in the range of 2 to 15; the vinyl polymers A and B respectively having a ratio of weight-average molecular weight to number-average molecular weight of 5 or less and the weight ratio of the vinyl polymer A to the vinyl polymer B being in the range of 1:4 to 10:1, dispersing solid core particles in the resulting organic solution, and subjecting the resulting dispersion to phase separation in order to obtain the encapsulated 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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |