US4764447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous type resin dispersion and electrophotographic developer containing said resin
Assignee: Ricoh Co Ltd
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Filing: 1986-07-08
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Granted: 1988-08-16
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Expires: 2006-07-08
Abstract
Abstract This invention relates to a non-aqueous type resin dispersion obtained by polymerizing a polymerizable composition containing at least monomer A represented by the general formula (I), ##STR1## (wherein, R 1 represents --H or --CH 3 , X represents --COOC n H 2n+1 or --OCOC n H 2n+1 , and n represents an integer of 6-20), monomer B represented by the general formula (II), ##STR2## (wherein, R 2 and R 3 represent --H or --CH 3 and m represents an integer of 1-20), and monomer C having a carboxyl group or a glycidyl group in the presence of a polymerization initiator in an aliphatic hydrocarbon solvent.
Inventors
- 👤 Kazuo Tsubuko
- 👤 Shinichi Kuramoto
- 👤 Kayoko Nagai
- 👤 Makoto Okawara
- 👤 Hajime Takanashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:07
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/10; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1812; G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
A liquid developer for electrophotography characterized by containing a colorant and a non-aqueous type resin dispersion obtained by polymerizing a system containing at least monomer A which has the formula (I), ##STR8## wherein R 1 is --H or --CH 3 , X is --COOC n H 2n+1 or --OCOC n H 2n+1 , and n is an integer of 6-20; monomer B which has the formula (II), ##STR9## wherein R 2 and R 3 are --H or --CH 3 and m is an integer of 1-20, and monomer C which has a carboxyl group or a glycidyl group, in the presence of a polymerization initiator in an aliphatic hydrocarbon solvent, wherein the weight ratio of monomer A:monomer B:monomer C is 50-95:1-25:1-25.
Claim 2
Dependent Claim
121 words
A liquid developer for electrophotography characterized by containing a colorant and a non-aqueous type resin dispersion obtained by polymerizing a system containing at least monomer A which has the formula (I), ##STR8## wherein R 1 is --H or --CH 3 , X is --COOC n H 2n+1 or --OCOC n H 2n+1 , and n is an integer of 6-20; monomer B which has the formula (II), ##STR9## wherein R 2 and R 3 are --H or --CH 3 and m is an integer of 1-20, and monomer C which has a carboxyl group or a glycidyl group, in the presence of a polymerization initiator in an aliphatic hydrocarbon solvent, wherein the weight ratio of monomer A:monomer B:monomer C is 50-95:1-25:1-25.
Claim 3
Dependent Claim
20 words
The liquid developer as claimed in claim 1, wherein said non-aqueous type resin dispersion further contains a polymerizable monomer D.
Claim 4
Dependent Claim
29 words
The liquid developer as claimed in claim 2, wherein the weight ratio of the copolymer comprising monomer A, monomer B and monomer C to the monomer D is 50-95:5-50.
Claim 5
Dependent Claim
55 words
The liquid developer as claimed in claim 2, wherein said monomer D is selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl methacrylate, propyl acrylate, n-butyl methacrylate, iso-butyl methacrylate, vinyl acetate, vinyl toluene, styrene, p-chlorostyrene, divinylbenzene, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, dimethylamino ethylmethacrylate, acrylonitrile, vinylpyrrolidone, vinylpyridine and dimethylaminomethyl methacrylate.
Claim 6
Dependent Claim
31 words
The liquid developer as claimed in claim 1, wherein said non-aqueous type resin dispersion further contains at least one member selected from the group consisting of powdery silica, wax and polyolefin.
Claim 7
Dependent Claim
31 words
The liquid developer as claimed in claim 3, wherein said non-aqueous type resin dispersion further contains at least one member selected from the group consisting of powdery silica, wax and polyolefin.
Claim 8
Dependent Claim
28 words
The liquid developer as claimed in claim 1, wherein said monomer A is stearyl methacrylate, said monomer B is ##STR10## and said monomer C is glycidyl propyl methacrylate.
Claim 9
Dependent Claim
36 words
The liquid developer as claimed in claim 2, wherein said monomer A is lauryl acrylate, said monomer B is ##STR11## said monomer C is methacrylic acid and glycidyl acrylate and said monomer D is vinyl acetate.
Claim 10
Dependent Claim
36 words
The liquid developer as claimed in claim 2, wherein said monomer A is lauryl methacrylate, said monomer B is ##STR12## said monomer C is methacrylic acid and glycidyl acrylate and said monomer D is ethyl acrylate.
Claim 11
Dependent Claim
21 words
The liquid developer as claimed in claim 9, wherein said monomer B is ##STR13## and said monomer D is dimethylamino ethylmethacrylate.
Claim 12
Dependent Claim
33 words
The liquid developer as claimed in claim 2, wherein said monomer A is stearyl methacrylate, said monomer B is ##STR14## said monomer C is acrylic acid and said monomer D is methyl methacrylate.
Claim 13
Dependent Claim
14 words
The liquid developer as claimed in claim 9, wherein said monomer B is ##STR15##
Claim 14
Dependent Claim
176 words
A non-aqueous resin dispersion obtained by copolymerizing (1) a monomer A having the formula (I) ##STR16## wherein R 1 is --H or --CH 3 , X IS --COOC n H n+1 or --OCOC n H 2n+1 , and n is an integer of 6 to 20, (2) a monomer B having the formula (II) ##STR17## wherein R 2 and R 3 are --H or --CH 3 , and m is an integer of 1 to 20, and (3) a monomer C which has a carboxyl group or a glycidyl group, in the presence of a polymerization initiator, in an aliphatic hydrocarbon solvent, to obtain a copolymer; and then grafting said copolymer with a monomer D selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl methacrylate, propyl acrylate, n-butyl methacrylate, iso-butyl methacrylate, vinyl acetate, vinyl toluene, styrene, p-chlorostyrene, divinylbenzene, diethyleneglycol dimethacrylate, trimethylolpropane trimethacrylate, dimethylaminoethyl methacrylate, acrylonitrile, vinylpyrrolidone, vinylpyridine and dimethylaminomethyl methacrylate, the weight ratio of monomer A/monomer B/monomer C being 50-95/1-25/1≧25 and the weight ratio of said copolymer/monomer D being 50-95/5-50.
Claim 15
Dependent Claim
176 words
A non-aqueous resin dispersion obtained by copolymerizing (1) a monomer A having the formula (I) ##STR16## wherein R 1 is --H or --CH 3 , X IS --COOC n H n+1 or --OCOC n H 2n+1 , and n is an integer of 6 to 20, (2) a monomer B having the formula (II) ##STR17## wherein R 2 and R 3 are --H or --CH 3 , and m is an integer of 1 to 20, and (3) a monomer C which has a carboxyl group or a glycidyl group, in the presence of a polymerization initiator, in an aliphatic hydrocarbon solvent, to obtain a copolymer; and then grafting said copolymer with a monomer D selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl methacrylate, propyl acrylate, n-butyl methacrylate, iso-butyl methacrylate, vinyl acetate, vinyl toluene, styrene, p-chlorostyrene, divinylbenzene, diethyleneglycol dimethacrylate, trimethylolpropane trimethacrylate, dimethylaminoethyl methacrylate, acrylonitrile, vinylpyrrolidone, vinylpyridine and dimethylaminomethyl methacrylate, the weight ratio of monomer A/monomer B/monomer C being 50-95/1-25/1≧25 and the weight ratio of said copolymer/monomer D being 50-95/5-50.
Claim 16
Dependent Claim
21 words
The liquid developer as claimed in claim 1 in which said monomer B is selected from the group consisting of ##STR18##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |