US4565763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing toner
Assignee: Canon Inc
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Filing: 1983-05-26
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Granted: 1986-01-21
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Expires: 2003-05-26
Abstract
Abstract A process for producing a toner includes melt-blending at least a colorant and a polymer and finely pulverizing the resulting blend after cooling, wherein the polymer is a crosslinked resin having a ratio of weight-average molecular weight to number-average molecular weight (Mw/Mn) exceeding 4.0 and a melt index of 0.01-10 g/10 min. at 110° C. under a load of 10 Kg and the polymer is further crosslinked to form gel during the melt-blending. The toner thus obtained exhibits a good fixability without offset phenomenon over a wide temperature range.
Inventors
- 👤 Masaki Uchiyama
- 👤 Yasuo Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08793; G03G9/08795; G03G9/08797
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
85 words
A process for producing a toner by melt-blending at least a colorant and a polymer and finely pulverizing the resulting blend after cooling characterized in that said polymer is a crosslinked resin having a ratio of weight-average molecular weight to number-average molecular weight (Nw/Mn) exceeding 4.0 and a melt index of 0.01-10 g/10 min. at 110° C. under a load of 10 Kg, said polymer further crosslinked during the melt-blending, and the final gel content of said polymer after the melt-blending is lower than 50%.
Claim 2
Dependent Claim
85 words
A process for producing a toner by melt-blending at least a colorant and a polymer and finely pulverizing the resulting blend after cooling characterized in that said polymer is a crosslinked resin having a ratio of weight-average molecular weight to number-average molecular weight (Nw/Mn) exceeding 4.0 and a melt index of 0.01-10 g/10 min. at 110° C. under a load of 10 Kg, said polymer further crosslinked during the melt-blending, and the final gel content of said polymer after the melt-blending is lower than 50%.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the Mw/Mn ratio of the crosslinked polymer before the melt-blending is more than 10.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein the melt index of the crosslinked polymer before the melt-blending is 0.1-6 g/10 min. at 110° C. under a load of 10 kg.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the glass transition temperature of the polymer further crosslinked during the melt-blending is 50° C. or higher.
Claim 6
Dependent Claim
21 words
A process according to claim 1, wherein the weight-average molecular weight of the crosslinked polymer before melt-blending is at least 100,000.
Claim 7
Dependent Claim
22 words
A process according to claim 1, wherein the melt-blending is carried out at a temperature around the softening point of the polymer.
Claim 8
Dependent Claim
32 words
A process according to claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 has been prepared by a polymerization in the presence of a small amount of a polyfunctional monomer.
Claim 9
Dependent Claim
23 words
A process according to claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 has been prepared by a solution polymerization process.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein the crosslinking reaction during the melt-blending is thermally initiated.
Claim 11
Dependent Claim
19 words
A process according to claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 is an acrylic resin.
Claim 12
Dependent Claim
19 words
A process according to claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 is a polyester resin.
Claim 13
Dependent Claim
10 words
A toner prepared according to the process of claim 1.
Claim 14
Dependent Claim
25 words
A toner prepared according to the process of claim 1, wherein the Mw/Mn ratio of the crosslinked polymer for the melt-blending is more than 10.
Claim 15
Dependent Claim
34 words
A toner prepared according to the process of claim 1, wherein the melt index of the crosslinked polymer before the melt-blending is 0.1-6 g/10 Min. at 110° C. under a load of 10 Kg.
Claim 16
Dependent Claim
28 words
A toner prepared according to the process of claim 1, wherein the glass transition temperature of the polymer further crosslinked during the melt-blending is 50° C. or higher.
Claim 17
Dependent Claim
25 words
A toner prepared according to the process of claim 1, wherein the weight-average molecular weight of the crosslinked polymer before melt-blending is at least 100,000.
Claim 18
Dependent Claim
26 words
A toner prepared according to the process of claim 1, wherein the melt-blending is carried out at a temperature around the softening point of the polymer.
Claim 19
Dependent Claim
36 words
A toner prepared according to the process of claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 has been prepared by a polymerization in the presence of a small amount of a polyfunctional monomer.
Claim 20
Dependent Claim
27 words
A toner prepared according to the process of claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 has been prepared by a solution polymerization process.
Claim 21
Dependent Claim
19 words
A toner prepared according to the process of claim 1, wherein the crosslinking reaction during melt-blending is thermally initiated.
Claim 22
Dependent Claim
23 words
A toner prepared according to the process of claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 is an acrylic resin.
Claim 23
Dependent Claim
23 words
A toner prepared according to the process of claim 1, wherein the polymer having a Mw/Mn ratio exceeding 4.0 is a polyester resin.
References Cited (Backward Citations)
US4027080A
Cited
US4217406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |