EP0254543A2
Expired / Lapsed
EP
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Electrostatic image developing toner
Assignee: Konica Minolta Inc
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Filing: 1987-07-21
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Granted: —
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Expires: 2007-07-21
Abstract
Abstract An electrostatic image developing toner comprising a block copolymer or graft copolymer as a binder component, said block or graft copolymer containing therein a crystalline polyester and, chemically combined therewith, an amorphous vinyl polymer having a functional group which is capable of forming a chemical bond with said crystralline polyester, said amorphous vinyl polymer having at least two peaks in its molecular weight distribution curve.
Inventors
- 👤 Kunio Akimoto
- 👤 Satoru Ikeuchi
- 👤 Yoshio Takizawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08786; G03G9/08788
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
An electrostatic image developing toner comprising a block copolymer or graft copolymer as a binder component, said block or graft copolymer containing therein a crystalline polyester and, chemically combined therewith, an amorphous vinyl polymer having a functional group which is capable of forming a chemical bond with said crystalline polyester, said amorphous vinyl polymer having at least two peaks in its molecular weight distribution curve.
Claim 2
Dependent Claim
65 words
An electrostatic image developing toner comprising a block copolymer or graft copolymer as a binder component, said block or graft copolymer containing therein a crystalline polyester and, chemically combined therewith, an amorphous vinyl polymer having a functional group which is capable of forming a chemical bond with said crystalline polyester, said amorphous vinyl polymer having at least two peaks in its molecular weight distribution curve.
Claim 3
Dependent Claim
39 words
The electrostatic image developing toner of Claim 1, wherein melting point of said crystalline polyester is within the range from 50 to 120°C and glass transition point of said amorphous vinylpolymer is within the range from 50 to 100°C.
Claim 4
Dependent Claim
44 words
The electrostatic image developing toner of Claim 1, wherein at least one peak molecular weight of said amorphous vinyl polymer resides within the range of 100,000 to 1,000,000 and at least one other peak molecular weight resides within the range of 2,000 to 20,000.
Claim 5
Dependent Claim
32 words
The electrostatic image developing toner of Claim 1, wherein said crystalline polyester has a weight average molecular weight of 5,000 to 50,000 and a number average molecular weight of 2,000 to 20,000.
Claim 6
Dependent Claim
29 words
The electrostatic image developing toner of Claim 1, wherein the proportion of said crystalline polyester with respect to the block or graft copolymer is 5 to 40% by weight.
Claim 7
Dependent Claim
27 words
The electrostatic image developing toner of Claim 1, wherein said toner comprises a wax having a softening point by ring and ball method of 60 to 150°C.
Claim 8
Dependent Claim
18 words
The electrostatic image developing toner of Claim 1, wherein said toner is covered with an inorganic fine powder.
Claim 9
Dependent Claim
33 words
The electrostatic image developing toner of Claim 7, wherein said inorganic fine powder has a primary average grain size of 5 to 500mµ and a BET surface area of 20 to 500 m²/g.
Claim 10
Dependent Claim
17 words
The electrostatic image developing toner of Claim 8, wherein said inorganic fine powder is a hydrohobic silica.
Claim 11
Independent Claim
105 words
A method of forming a toner image in electropphotography which comprises a step of formimg a toner image on a recording sheet and a step of fixing said toner image by bringing said toner image-bearing sheet into pressure contact with a heat roller, said toner comprising a block copolymer or graft copolymer as a binder component, said block or graft copolymer containing therein a crystalline polyester and, chemically combined therewith, an amorphous vinyl polymer having a functional group which is capable of forming a chemical bond with said crystalline polyester, said amorphous vinyl polymer having at least two peaks in its molecular weight distribution curve.
Claim 12
Independent Claim
105 words
A method of forming a toner image in electropphotography which comprises a step of formimg a toner image on a recording sheet and a step of fixing said toner image by bringing said toner image-bearing sheet into pressure contact with a heat roller, said toner comprising a block copolymer or graft copolymer as a binder component, said block or graft copolymer containing therein a crystalline polyester and, chemically combined therewith, an amorphous vinyl polymer having a functional group which is capable of forming a chemical bond with said crystalline polyester, said amorphous vinyl polymer having at least two peaks in its molecular weight distribution curve.
Claim 13
Dependent Claim
27 words
The method of Claim 10, wherein said heat roller has the surface, which is to be in contact with the toner image, made of a fluorinated polymer.
Claim 14
Dependent Claim
12 words
The method of Claim 11, wherein said fluorinated polymer is a teflon.
References Cited (Backward Citations)
No citation records indexed.
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