EP0573705A1
Expired / Lapsed
EP
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Toner resin composition and process for preparing same
Assignee: Mitsubishi Chemical Corp
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Filing: 1992-05-12
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Granted: —
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Expires: 2012-05-12
Abstract
Abstract A toner resin composition comprising 5 to 40% by weight of a polyester (A) having a weight average molecular weight of 3,000 to 20,000 and 50 to 95% by weight of a styrene-acrylic copolymer (B). The styrene-acrylic copolymer (B) is comprised of 10 to 25% by weight of a high molecular weight polymer (B1) having a weight average molecular weight of 500,000 to 1,100,000 and 75 to 90% by weight of a low molecular weight polymer (B2) having a weight average molecular weight of 5,000 to 100,000. The high molecular weight polymer (B1) is comprised of a styrene component (b-1) and an acrylic ester and/or methacrylic ester component (b-2). The low molecular weight polymer (B2) is comprised of a styrene component (b-1), an acrylic ester and/or methacrylic ester component (b-2), 0.3 to 3 parts by weight, per 100 parts of the total weight of said component (b-1) and component (b-2), of an α -methyl styrene dimer (b-3) and 0.5 to 30 parts by weight, per 100 parts by weight of said polyester (A), of a glycidyl methacrylate component (b-4).
Inventors
- 👤 Hirokazu Ito
- 👤 Masahiro Itoh
- 👤 Motoshi Inagaki
- 👤 Syuji Takahiro
- 👤 Keiji Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 14:22
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08786; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08742; G03G9/08755; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/109
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
181 words
A toner resin composition comprising 5 to 40% by weight of a polyester (A) having a weight average molecular weight of 3,000 to 20,000 and 60 to 95% by weight of a styrene-acrylic copolymer (B), wherein said styrene-acrylic copolymer (B) is comprised of 10 to 25% by weight of a high molecular weight polymer (B1) having a weight average molecular weight of 500,000 to 1,100,000 and 75 to 90% by weight of a low molecular weight polymer (B2) having a weight average molecular weight of 5,000 to 100,000, said high molecular weight polymer (B1) is comprised of a styrene component (b-1) and an acrylic ester and/or methacrylic ester component (b-2), and said low molecular weight polymer (B2) is comprised of a styrene component (b-1), an acrylic ester and/or methacrylic ester component (b-2), 0.3 to 3 parts by weight, per 100 parts of the total weight of said component (b-1) and component (b-2), of an α -methyl styrene dimer (b-3) and 0.5 to 30 parts by weight, per 100 parts by weight of said polyester (A), of a glycidyl methacrylate component (b-4).
Claim 2
Dependent Claim
34 words
A composition as set forth in claim 1, which has a glass transition temperature of 40 to 68°C, a softening point of 100 to 160°C and an acid value of 0.1 to 10 mgKOH/g.
Claim 3
Dependent Claim
60 words
A composition as set forth in claim 1 or 2, wherein said polyester (A) has a structure originating in a divalent carboxylic acid component (a-1), 0.2 to 0.7 mole, per mole of said divalent carboxylic acid, of an aromatic diol component (a-2) and 0.3 to 0.8 mole, per mole of said divalent carboxylic acid, of an aliphatic diol component (a-3).
Claim 4
Dependent Claim
40 words
A composition as set forth in claim 3, wherein said divalent carboxylic acid component (a-1) is selected from the group consisting of maleic acid, fumaric acid, itaconic acid, cyclohexane dicarboxylic acid, terephthalic acid, isophthalic acid, adipic acid and sebacic acid.
Claim 5
Dependent Claim
41 words
A composition as set forth in claim 3 or 4, wherein said aromatic diol component (a-2) is selected from the group consisting of bis-phenol A, bis-phenol S, bis-phenol F, hydrogenated bis-phenol A, polyoxypropylene-(n)-polyoxyethylene-(n')-2,2-bis(4-hydroxyphenyl)propane, polyoxypropylene-(n')-2,2-bis(4-hydroxyphenyl)propane, polyoxyethylene-(n)-2,2-bis(4-hydroxyphenyl)propane and polyoxypropylene-(n)-hydroxone (where 2≦n and n'≦6).
Claim 6
Dependent Claim
43 words
A composition as set forth in any of claims 3, 4 or 5 wherein said aliphatic diol component (a-3) is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, 1,2-butanediol, 1,3-butanediol, cyclohexane dimethanol and neopentyl glycol.
Claim 7
Dependent Claim
47 words
A composition as set forth in any preceding claim, wherein said polyester (A) has a weight average molecular weight of 3,000 to 20,000, an acid value of 0.5 to 10 mgKOH/g, a glass transition temperature of 40 to 68°C and a softening temperature of 80 to 160°C.
Claim 8
Dependent Claim
109 words
A composition as set forth in any preceding claim, wherein said styrene-acrylic copolymer (B) is comprised of a styrene component (b-1), an acrylic ester and/or methacrylic ester component (b-2), an α -methyl styrene dimer (b-3) and a glycidyl methacrylate component (b-4) in amounts, per 100 parts of the total weight of said component (b-1) and component (b-2), of 50 to 90 parts by weight of said component (b-1), 10 to 50 parts by weight of said component (b-2) and 0.3 to 3 parts by weight of said dimer (b-3) and 0.5 to 30 parts by weight, per 100 parts by weight of said polyester (A), of said component (b-4).
Claim 9
Dependent Claim
38 words
A composition as set forth in any preceding claim, wherein said styrene component (b-1) is selected from the group consisting of styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, p-n-butylstyrene, p-tert-butylstyrene, p-n-hexylstyrene, p-n-octylstyrene, p-n-nonylstyrene, p-n-decylstyrene, p-n-dodecylstyrene, p-phenylstyrene and 3,4-dichlorostyrene.
Claim 10
Dependent Claim
58 words
A composition as set forth in any preceding claim, wherein said acrylic ester and/or methacrylic ester component (b-2) is selected from the group consisting of ethyl acrylate, methyl acrylate, n-butyl acrylate, isobutyl acrylate, propyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, ethyl methacrylate, methyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, propyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate.
Claim 11
Dependent Claim
77 words
A composition as set forth in any preceding claim, wherein the ratio of the amounts of said styrene component (b-1) to said acrylic ester and/or methacrylic ester component (b-2) is such that the amount of the component (b-1) is 50 to 90 parts by weight and the amount of the component (b-2) is 10 to 50 parts by weight with respect to 100 parts by weight of the total amounts of the component (b-1) and component (b-2).
Claim 12
Dependent Claim
31 words
A composition as set forth in any preceding claim, wherein said styrene-acrylic copolymer (B) has a glass transition temperature of 40 to 68°C and a softening point of 100 to 160°C.
Claim 13
Dependent Claim
279 words
A toner resin composition comprising: 5 to 40% by weight of a polyester (A) having a structure originating in a divalent carboxylic acid component (a-1), 0.2 to 0.7 mole, per mole of said divalent carboxylic acid, of an aromatic diol component (a-2) and 0.3 to 0.8 mole, per mole of said divalent carboxylic acid, of an aliphatic diol component (a-3) and having a weight average molecular weight of 3,000 to 20,000, an acid value of 0.5 to 10 mgKOH/g, a glass transition temperature of 40 to 68°C and a softening temperature of 80 to 160°C; and, 60 to 95% by weight of a styrene-acrylic copolymer (B) formed by using a styrene component (b-1), an acrylic ester and/or methacrylic ester component (b-2), an α -methyl styrene dimer (b-3) and a glycidyl methacrylate component (b-4) in amounts, per 100 parts of the total weight of said component (b-1) and component (b-2), of 50 to 90 parts by weight of said component (b-1), 10 to 50 parts by weight of said component (b-2) and 0.3 to 3 parts by weight of said dimer (b-3) and 0.5 to 30 parts by weight, per 100 parts by weight of said polyester (A), of said component (b-4); wherein said styrene-acrylic copolymer (B) is comprised of 10 to 25% by weight of a high molecular weight polymer (B1) having a weight average molecular weight of 500,000 to 1,100,000 and 75 to 90% by weight of a low molecular weight polymer having a weight average molecular weight of 5,000 to 100,000, and has a glass transition temperature of 40 to 68°C, a softening point of 100 to 160°C and an acid value of 0.1 to 10 mgKOH/g.
Claim 14
Dependent Claim
216 words
A process for preparing a toner resin composition comprising a polyester (A) a styrene-acrylic copolymer (B) wherein said styrene-acrylic copolymer (B) is comprised of 10 to 25% by weight of a high molecular weight polymer (B1) having a weight average molecular weight of 500,000 to 1,100,000 and 75 to 90% by weight of a low molecular weight polymer (B2) having a weight average molecular weight of 5,000 to 100,000, which process comprises of the steps of, subjecting 10 to 25% by weight of a styrene component (b-1) and an acrylic ester and/or methacrylic ester component (b-2) to form an emulsion of a high molecular weight polymer (B1) having a weight average molecular weight of 500,000 to 1,100,000 to emulsion polymerization, and adding, to the obtained emulsion, 5 to 40% by weight of a polyester (A) having a weight average molecular weight of 3,000 to 20,000 and at least a styrene component (b-1), an acrylic ester and/or methacrylic ester component (b-2), 0.3 to 3 parts by weight, per 100 parts of the total weight of said component (b-1) and component (b-2), of an α -methyl styrene dimer (b-3) and 0.5 to 30 parts by weight, per 100 parts by weight of said polyester (A), of a glycidyl methacrylate component (b-4), and subjecting the mixture to suspension polymerization.
Claim 15
Dependent Claim
23 words
A process according to claim 14, wherein the emulsion polymerization is carried out in the presence of an emulsifier and a polymerization initiator.
Claim 16
Dependent Claim
20 words
A process according to claim 15, wherein the emulsifier is selected from nonionic and anionic hydrophilic emulsifiers and lipophilic emulsifiers.
Claim 17
Dependent Claim
53 words
A process according to claim 16, wherein the emulsifier is used in an amount of 0.2 to 4 parts by weight and the polymerization initiator is used in an amount of 0.1 to 0.4 part by weight, per 100 parts by weight of the total amounts of the component (b-1) and component (b-2).
Claim 18
Dependent Claim
20 words
A process according to claim 17, wherein the emulsion polymerization is carried out at a temperature of 65 to 75°C.
Claim 19
Dependent Claim
16 words
A process according to claim 15, wherein the emulsifier is selected from reactive surface active agents.
Claim 20
Dependent Claim
53 words
A process according to claim 19, wherein the emulsifier is used in an amount of 0.1 to 2 parts by weight and the polymerization initiator is used in an amount of 0.1 to 0.4 part by weight, per 100 parts by weight of the total amounts of the component (b-1) and component (b-2).
Claim 21
Dependent Claim
20 words
A process according to claim 20, wherein the emulsion polymerization is carried out at a temperature of 65 to 75°C.
Claim 22
Dependent Claim
28 words
A process according to claim 14, wherein the suspension polymerization is carried out in the presence of deionized water, a dispersant, a polymerization stabilizer and a polymerization initiator.
Claim 23
Dependent Claim
55 words
A process according to claim 22, wherein the dispersant is used in an amount of 0.05 to 1 part by weight and the polymerization initiator is used in an amount of 3 to 10 parts by weight, per 100 parts by weight of the total amounts of the component (b-1), component (b-4) and polyester (A).
Claim 24
Dependent Claim
20 words
A process according to claim 23, wherein the suspension polymerization is carried out at a temperature of 70 to 98°C.
References Cited (Backward Citations)
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