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US4665011A
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Electrostatographic suspension developer having a block copolymer containing aromatic vinyl compounds and dienes reacted with mercaptan
Assignee: Agfa Gevaert AG
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Filing: 1986-08-22
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Granted: 1987-05-12
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Expires: 2006-08-22
Abstract
Abstract New block copolymers containing (a) a block of from 5 to 100 parts by weight polymerized, basic, nitrogen-containing aromatic vinyl compounds and from 0 to 95 parts by weight polymerized, nitrogen-free aromatic vinyl compounds and (b) a block of polymerized C 4 -C 6 dienes containing 25 to 95% lateral double bonds which are completely or partly reacted with alkylmercaptans. are suitable for improved suspension developers.
Inventors
- 👤 Wolfgang Padszun
- 👤 Josef Witte
- 👤 Carlhans Suling
- 👤 John Goossens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:18
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/133; C; C08; C08F; C08F297/00; C08F297/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
An electrostatographic suspension developer containing a dispersed pigment and a block copolymer in an electrically insulating carrier liquid having a volume resistance of at least 10 9 ohm.cm and a dielectric constant below 3, characterized in that the block copolymer contains: (a) a block of from 5 to 100 parts by weight polymerized, basic, nitrogen-containing aromatic vinyl compounds and 0 to 95 parts by weight polymerized, nitrogen-free aromatic vinyl compounds and (b) a block of polymerized C 4 -C 6 dienes containing 25 to 95% lateral double bonds which are completely or partly reacted with alkylmercaptans.
Claim 2
Dependent Claim
96 words
An electrostatographic suspension developer containing a dispersed pigment and a block copolymer in an electrically insulating carrier liquid having a volume resistance of at least 10 9 ohm.cm and a dielectric constant below 3, characterized in that the block copolymer contains: (a) a block of from 5 to 100 parts by weight polymerized, basic, nitrogen-containing aromatic vinyl compounds and 0 to 95 parts by weight polymerized, nitrogen-free aromatic vinyl compounds and (b) a block of polymerized C 4 -C 6 dienes containing 25 to 95% lateral double bonds which are completely or partly reacted with alkylmercaptans.
Claim 3
Dependent Claim
56 words
A suspension developer as claimed in claim 1, characterized in that the block copolymer contains (a) a block of from 5 to 100 parts by weight polymerized vinylpyridine and from 0 to 95 parts by weight polymerized styrene and (b) a polybutadiene block of which the vinyl double bonds are completely or partly reacted with alkylmercaptans.
Claim 4
Dependent Claim
31 words
A suspension developer as claimed in claim 1 or 2, characterized in that the suspension developer additionally contains a Bronsted acid containing at least one C 6 -C 24 hydrocarbon radical.
Claim 5
Dependent Claim
150 words
A suspension developer as claimed in claim 3, characterized in that the Bronsted acids correspond to the following general formulae ##STR4## in which R 2 is a difunctional C 1 -C 18 hydrocarbon radical, R 4 is a C 1 -C 18 hydrocarbon radical, R 5 is a C 6 -C 24 hydrocarbon radical, R 6 is --COOR 5 or SO 2 R 5 , R 7 and R 8 may be the same or different and represent one of the groups --CN, --NO 2 , --halogen, --COOR 5 or --SO 2 R 5 , R 9 to R 13 may be the same or different and represent --COOR 14 and R 14 is a C 1 -C 24 hydrocarbon radical, with the proviso that, in at least one of the radicals R 9 to R 13 , the substituent R 14 is a C 6 -C 24 hydrocarbon radical.
Claim 6
Dependent Claim
31 words
A suspension developer as claimed in claim 4, characterized in that the Bronsted acid corresponds to the following formula ##STR5## in which R 9 to R 13 are as defined above.
Claim 7
Dependent Claim
20 words
A suspension developer as claimed in claims 1 to 5, characterized in that the dispersed pigment is coated with polycyanoacrylate.
Claim 8
Dependent Claim
64 words
A block copolymer, characterized in that it contains: (a) a block of from 5 to 100 parts by weight polymerized, basic, nitrogen-containing aromatic vinyl compounds and from 0 to 95 parts by weight polymerized, nitrogen-free aromatic vinyl compounds and (b) a block of polymerized C 4 -C 6 dienes containing 25 to 95% lateral double bonds which are completely or partly reacted with alkylmercaptans.
Claim 9
Dependent Claim
64 words
A block copolymer, characterized in that it contains: (a) a block of from 5 to 100 parts by weight polymerized, basic, nitrogen-containing aromatic vinyl compounds and from 0 to 95 parts by weight polymerized, nitrogen-free aromatic vinyl compounds and (b) a block of polymerized C 4 -C 6 dienes containing 25 to 95% lateral double bonds which are completely or partly reacted with alkylmercaptans.
Claim 10
Dependent Claim
54 words
A block copolymer as claimed in claim 7, characterized in that it contains: (a) a block of from 5 to 100 parts by weight polymerized vinylpyridine and from 0 to 95 parts by weight polymerized styrene and (b) a polybutadiene block of which the vinyl double bonds are completely or partly reacted with alkylmercaptans.
Claim 11
Dependent Claim
21 words
A suspension developer as claimed in claim 1 comprising additionally a controller compound regulating the electrical charge of the toner particles.
Claim 12
Dependent Claim
27 words
A suspension developer as claimed in claim 9 wherein the controller compound is a divalent or trivalent metal salt of a phosphorus-based oxyacid containing an organic group.
References Cited (Backward Citations)
US4599291A
Cited
US4606989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |