US4599291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic suspension developer of block copolymer reacted with mercaptan
Assignee: Agfa Gevaert AG
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Filing: 1985-03-20
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Granted: 1986-07-08
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Expires: 2005-03-20
Abstract
Abstract The suspension developer contains, in an electrically-insulating carrier liquid, a pigment and a block copolymer comprising a block of polymerized vinylaromatic compounds and a block of polymerized dienes the double bonds of which have been partially or completely reacted with alkyl mercaptans. The developer is distinguished by its high dispersion stability, small particle size and uniform particle size distribution.
Inventors
- 👤 Wolfgang Podszun
- 👤 Josef Witte
- 👤 Herman Uytterhoeven
- 👤 John Goossens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:30
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/133; C; C08; C08F; C08F8/00; C08F8/34; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
Electrostatographic suspension developer containing, in an electrically-insulating carrier liquid having a volumetric resistance of at least 10 9 Ohm.cm and a dielectric constant below 3, a dispersed pigment, and from 10-50% by weight based on the quantity of pigment of a block copolymer, comprised of: (a) a block of polymerized vinylaromatic compounds and (b) a block of polymerized C 4 -C 6 -dienes, wherein the vinyl double bonds are completely or partially reacted with alkyl mercaptans.
Claim 2
Dependent Claim
76 words
Electrostatographic suspension developer containing, in an electrically-insulating carrier liquid having a volumetric resistance of at least 10 9 Ohm.cm and a dielectric constant below 3, a dispersed pigment, and from 10-50% by weight based on the quantity of pigment of a block copolymer, comprised of: (a) a block of polymerized vinylaromatic compounds and (b) a block of polymerized C 4 -C 6 -dienes, wherein the vinyl double bonds are completely or partially reacted with alkyl mercaptans.
Claim 3
Dependent Claim
33 words
Suspension developer according to claim 1, wherein the block copolymer comprises (a) a polystyrene block; and (b) a polybutadiene block wherein the vinyl double bonds are partially or completely reacted with alkyl mercaptans.
Claim 4
Dependent Claim
66 words
Suspension developer according to claim 1, characterised in that the mass proportion of diene in the block copolymer which is reacted with alkyl mercaptans is from 20 to 80%, the polydiene block contains from 25 to 95% of vinyl double bonds and the molar mass of the block copolymer on which the reaction with alkyl mercaptans is based amounts to 10 3 to 5×10 5 g/mol.
Claim 5
Dependent Claim
29 words
Suspension developer according to claims 1 and 2, characterised in that from 5 to 100% of the vinyl double bonds of the polybutadiene block are reacted with alkyl mercaptans.
Claim 6
Dependent Claim
25 words
Suspension developer according to claim 4, characterised in that the alkyl mercaptans contain a straight- or branched-chain alkyl group having 4 to 20 carbon atoms.
Claim 7
Dependent Claim
19 words
Suspension developer according to claim 1, characterised in that it contains a control substance for regulating the electric charge.
Claim 8
Dependent Claim
13 words
Suspension developer according to claim 6, characterised in that it contains zinc-mono-(2-butyl)octyl phosphate.
References Cited (Backward Citations)
US3900412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |