EP0643336A2
Expired / Lapsed
EP
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Binder resin for toner and positively chargeable toner containing the same
Assignee: Kao Corp
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Filing: 1994-09-01
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Granted: —
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Expires: 2014-09-01
Abstract
Abstract The positively chargeable toner includes a binder resin and a coloring agent, the binder resin including (a) a resin (1) capable of forming a matrix in the toner, the resin (1) being a hybrid resin of a polyester resin and a vinyl resin; and (b) a resin (2) capable of forming a domain dispersed in the matrix formed by the resin (1), the resin (2) being a vinyl resin having a positive charge functional group. This positively chargeable toner has a good evenness of chargeability and a high charging-up speed with a small proportion of a reversely charged toner upon triboelectric charging. Moreover, in a heat roller fixing method, fixing at a low temperature can be performed without using an offset inhibiting liquid.
Inventors
- 👤 Shin-Ichi Sata
- 👤 Yasuhiro Hidaka
- 👤 Katsutoshi Aoki
- 👤 Hiroyuki Kawaji
- 👤 Masayuki Maruta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:36
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08726; G03G9/08728; G03G9/08742; G03G9/08755; G03G9/08784; G03G9/08791; G03G9/097; G03G9/09733; G03G9/09741
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A binder resin for a toner comprising: (a) a resin (1) capable of forming a matrix in the toner, said resin (1) being a hybrid resin of a polyester resin and a vinyl resin; and (b) a resin (2) capable of forming a domain dispersed in the matrix formed by the resin (1), said resin (2) being a vinyl resin having a positive charge functional group.
Claim 2
Dependent Claim
52 words
The binder resin according to claim 1, wherein said resin (1) is obtainable by a process comprising the step of concurrently carrying out a condensation polymerization and an addition polymerization in one reaction vessel using monomers for polymerizing polyester resins, monomers for polymerizing vinyl resins, and a compound reacting with both monomers.
Claim 3
Dependent Claim
24 words
The binder resin according to claim 1 or 2, wherein the vinyl resin in the resin (1) comprises one or more styrene monomer components.
Claim 4
Dependent Claim
24 words
The binder resin according to claim 2, wherein said compound reacting with both monomers is selected from fumaric acid, acrylic acid, and methacrylic acid.
Claim 5
Dependent Claim
28 words
The binder resin according to any of claims 1 to 4, wherein the amount of the polyester resin in said resin (1) is 51 to 95% by weight.
Claim 6
Dependent Claim
29 words
The binder resin according to any of claims 1 to 5, wherein said vinyl resin having a positive charge functional group comprises monomer components of polystyrene or styrene-acrylic copolymer.
Claim 7
Dependent Claim
27 words
The binder resin according to any of claims 1 to 6, wherein said positive charge functional group is a nitrogen-containing functional group or a phosphorus-containing functional group.
Claim 8
Dependent Claim
44 words
The binder resin according to any of claims 1 to 7, wherein said vinyl resin having a positive charge functional group is obtainable by a process comprising the step of copolymerizing monomers of a vinyl resin with a nitrogen-containing monomer or a phosphorus-containing monomer.
Claim 9
Dependent Claim
40 words
The binder resin according to claim 8, wherein said nitrogen-containing monomer or said phosphorus-containing monomer is selected from N,N-dialkylaminoalkyl (meth)acrylates, N,N-dialkylaminoalkyl (meth)acrylamides, N-vinyl compounds, vinylpyridine, morpholinoethyl (meth)acrylate, (meth)acryloyloxyethyl trimethyl ammonium chloride, (meth)acryloylaminopropyl trimethyl ammonium chloride, allyltriphenylphosphonium bromide, and allyltriphenylphosphonium chloride.
Claim 10
Dependent Claim
31 words
The binder resin according to any of claims 1 to 9, wherein the blending ratio (parts by weight) of the resin (1) to the resin (2) is from 99/1 to 50/50.
Claim 11
Dependent Claim
20 words
A positively chargeable toner comprising a binder resin of any one of claims 1 to 10, and a coloring agent.
Claim 12
Dependent Claim
59 words
The positively chargeable toner according to claim 11, further comprising a compound having the following general formula (I) and/or (II): wherein R₁, R₂, R₃, and R₄, which may be identical or different, independently represent an alkyl group, an alkoxy group, an aryl group, or an allyl group, each of which may form a ring; and A⁻ represents an anion.
References Cited (Backward Citations)
No citation records indexed.
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