US4845005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry developer composition comprising polymer binder resin and colorant
Assignee: Kao Corp
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Filing: 1983-12-30
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Granted: 1989-07-04
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Expires: 2003-12-30
Abstract
Abstract A dry developer composition for electrophotography is disclosed capable of retaining a positive charge and comprises a binder resin and a colorant, the binder resin being a polymer obtained by polymerizing, in a suspension, (A) 98 to 99.95 parts by weight of a hydrophobic copolymerizable monomer and (B) 0.05 to 2.0 parts by weight of a tertiary amino group-containing copolymerizable monomer having the formula (1): ##STR1## in which R1 is hydrogen or methyl, X is --COO-- or --CONH--, R2 and R3 are each an alkyl having 1 to 4 carbon atoms or an aryl and n is an integer of 1 to 4, in the presence of (C) 0.5 to 5.0 parts by weight of an azonitrile polymerization initiator.
Inventors
- 👤 Masao Niki
- 👤 Zenbei Meiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:14
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08726; G03G9/08728
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A dry developer composition for electrophotography capable of accepting a positive charge comprising a binder resin and a colorant, wherein said binder resin comprises a polymer obtained by polymerizing, in a suspension, (A) 98 to 99.95 parts by weight of a hydrophobic copolymerizable monomer and (B) 0.05 to 2.0 parts by weight of a tertiary amino group-containing copolymerizable monomer having the formula (1): ##STR5## in which R 1 is hydrogen or methyl, X is --COO-- or --CONH-- R 2 and R 3 are each an alkyl having 1 to 4 carbon atoms or an aryl and n is an integer of 1 to 4, in the presence of (C) 0.5 to 5.0 parts by weight of an azonitrile polymerization initiator.
Claim 2
Dependent Claim
120 words
A dry developer composition for electrophotography capable of accepting a positive charge comprising a binder resin and a colorant, wherein said binder resin comprises a polymer obtained by polymerizing, in a suspension, (A) 98 to 99.95 parts by weight of a hydrophobic copolymerizable monomer and (B) 0.05 to 2.0 parts by weight of a tertiary amino group-containing copolymerizable monomer having the formula (1): ##STR5## in which R 1 is hydrogen or methyl, X is --COO-- or --CONH-- R 2 and R 3 are each an alkyl having 1 to 4 carbon atoms or an aryl and n is an integer of 1 to 4, in the presence of (C) 0.5 to 5.0 parts by weight of an azonitrile polymerization initiator.
Claim 3
Dependent Claim
28 words
A dry developer composition as in claim 1, in which up to 2 parts by weight of said hydrophobic copolymerizable monomer has been replaced by a crosslinking agent.
Claim 4
Dependent Claim
43 words
A dry developer composition as in claim 1, in which said hydrophobic copolymerizable monomer (A) has a solubility in water of not higher than 1.0 wt. % or a solubility of water in said monomer (A) is not higher than 1.0 wt. %.
Claim 5
Dependent Claim
29 words
A dry developer composition as in claim 1, in which R 2 and R 3 in the formula (1) are each an alkyl having 2 to 4 carbon atoms.
Claim 6
Dependent Claim
46 words
A dry developer composition as in claim 1, in which said azonitrile polymerization initiator (C) has a group of the formula (2) attached to the azo group. ##STR6## in which R and R' are each an alkyl or alkoxy both having 1 to 5 carbon atoms.
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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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |