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EP0186307A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Resin binder for toner composition

Assignee: Kao Corp
•
Filing: 1985-11-21
•
Granted: —
•
Expires: 2005-11-21
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Abstract

Abstract @ A novel resin is produced by polymerizing (a) styrene and/or a derivative thereof, (b) at least one monomer component selected from methacrylic acid, acrylic acid, a methacrylic ester and an acrylic ester, and (c) from 0.05 to 10 percent by weight, based on the total weight of the monomers, of a polybasic acid having 7 to 40 carbon atoms, an anhydride thereof or a lower (C1 to C6) alkyl ester thereof, the monomer component (b) containing at least one acrylic or methacrylic ester having hydroxyl or epoxy groups in at least equimolar amount to the component (c). The resin preferably has a softening point of 100 to 160°C and a glass transition temperature of 50°C or higher. It is useful as a binder resin for a toner composition.

Inventors

  • 👤 Kuniyasu C/O Wakayama Laboratory Kawabe
  • 👤 Norihiro C/O Wakayama Laboratory Hayashi
  • 👤 Shinichiro C/O Wakayama Laboratory Yasuda

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 06:14
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726; G03G9/08733; C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; G03G9/08706; G03G9/08708; G03G9/08711

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 102 words
A process for manufacturing a resin, which comprises the step of polymerizing (a) styrene and/or a derivate thereof, (b) at least one monomer component selected from methacrylic acid, acrylic acid, a methacrylic ester and an acrylic ester, and (c) from 0.05 to 10 percent by weight, based on the total weight of the monomers, of a polybasic acid having 7 to 40 carbon atoms, an anhydride thereof or a lower (Cl to C6) alkyl ester thereof, the monomer component (b) containing at least one acrylic or methacrylic ester having hydroxyl or epoxy group in at least equimolar amount to the component (c).
Claim 2
Dependent Claim 102 words
A process for manufacturing a resin, which comprises the step of polymerizing (a) styrene and/or a derivate thereof, (b) at least one monomer component selected from methacrylic acid, acrylic acid, a methacrylic ester and an acrylic ester, and (c) from 0.05 to 10 percent by weight, based on the total weight of the monomers, of a polybasic acid having 7 to 40 carbon atoms, an anhydride thereof or a lower (Cl to C6) alkyl ester thereof, the monomer component (b) containing at least one acrylic or methacrylic ester having hydroxyl or epoxy group in at least equimolar amount to the component (c).
Claim 3
Dependent Claim 52 words
A process as claimed in Claim 1, in which the polybasic acid (c) has the formula: in which R is an alkyl, alkylene, alkenylene or alkenyl group, each having 5 to 30 carbon atoms,and has at least one side chain having 3 or more carbon atoms, and n is zero or one.
Claim 4
Dependent Claim 14 words
A resin which has been obtained by the process as claimed in Claim 1.
Claim 5
Dependent Claim 25 words
A resin as claimed in Claim 3, which has a softening point of 100 to 160°c and a glass transition temperature of 50°c or higher.
Claim 6
Dependent Claim 26 words
A toner composition which comprises as a binder resin the resin which has been obtained by the process as claimed in Claim 1 and a colorant.
Claim 7
Dependent Claim 30 words
A toner composition as claimed in Claim 5, in which the resin binder has a softening point of 100 to 160°c and a glass transition temperature of 50°c or higher.

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