Patent US5142330A successfully refreshed from Google Patents.
US5142330A
Expired / Lapsed
US
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Development unit having a toner layer thickness regulation member
Assignee: Ricoh Co Ltd
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Filing: 1991-01-22
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Granted: 1992-08-25
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Expires: 2011-01-22
Abstract
Abstract A development unit comprising a development roller for developing a latent electrostatic image formed on an electrophotographic photoconductor to a visible toner image by applying a non-magnetic one-component type toner thereto, and a toner layer thickness regulation member for forming a toner layer on the above development roller, which toner layer thickness regulation member comprises at least (a) a rubber-like fluorosilicone polymer including repeat units of formula (I), (b) a silicone polymer comprising a copolymer of dimethyl silicone and methyl vinyl silicone with a crosslinking density of 4x10-4 to 8x10-4 mol/cc, and (c) an alkylene-oxide-addition type fluorine-containing surface active agent: <IMAGE> (I) wherein n is 1,000 to 600,000.
Inventors
- 👤 Yasuo Hirano
- 👤 Jun Aoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; C; C08; C08L; C08L83/00; C08L83/04; C08L83/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
114 words
In a development unit comprising a development roller for developing a latent electrostatic image formed on an electrophotographic photoconductor to a visible toner image by applying a non-magnetic one-component type toner thereto, and a toner layer thickness regulation member for forming a toner layer on said development roller, an improvement wherein said toner layer thickness regulation member comprises at least (a) a fluorosilicone polymer including repeat units of formula (I), (b) a silicone polymer comprising a copolymer of dimethyl silicone and methyl vinyl silicone with a crosslinking density of 4×10 -4 to 8×10 -4 mol/cc, and (c) an alkylene-oxide-addition type fluorine-containing surface active agent: ##STR4## wherein n is an integer of 1,000 to 600,000.
Claim 2
Dependent Claim
114 words
In a development unit comprising a development roller for developing a latent electrostatic image formed on an electrophotographic photoconductor to a visible toner image by applying a non-magnetic one-component type toner thereto, and a toner layer thickness regulation member for forming a toner layer on said development roller, an improvement wherein said toner layer thickness regulation member comprises at least (a) a fluorosilicone polymer including repeat units of formula (I), (b) a silicone polymer comprising a copolymer of dimethyl silicone and methyl vinyl silicone with a crosslinking density of 4×10 -4 to 8×10 -4 mol/cc, and (c) an alkylene-oxide-addition type fluorine-containing surface active agent: ##STR4## wherein n is an integer of 1,000 to 600,000.
Claim 3
Dependent Claim
25 words
The development unit as claimed in claim 1, wherein n in formula (I) of said fluoro silicone polymer is an integer of 10,000 to 500,000.
Claim 4
Dependent Claim
25 words
The development unit as claimed in claim 1, wherein n in formula (I) of said fluoro silicone polymer is an integer of 100,000 to 500,000.
Claim 5
Dependent Claim
36 words
The development unit as claimed in claim 1, wherein said alkylene-oxide-addition type fluorine-containing surface active agent is in an amount of 0.1 to 10 parts by weight to 100 parts by weight of said fluorosilicone polymer.
Claim 6
Dependent Claim
42 words
The development unit as claimed in claim 1, wherein said silicone polymer comprising said copolymer of dimethyl silicone and methyl vinyl silicone is in an amount of 10 to 1,000 parts by weight to 100 parts by weight of said fluorosilicone polymer.
Claim 7
Dependent Claim
53 words
The development unit as claimed in claim 1 wherein said fluorosilicone polymer including repeat units of formula (I): said silicone polymer comprising a copolymer of dimethyl silicone and methyl vinyl silicone: said alkylene-oxide-addition type fluorine-containing surface active agent are present in a parts-by-weight ratio in the range of 100:10 to 1,000:0.1 to 10.
Claim 8
Dependent Claim
27 words
The development unit as claimed in claim 1, wherein said alkylene-oxide-addition type fluorine-containing surface active agent includes a moiety of ethylene oxide as said alkylene oxide thereof.
Claim 9
Dependent Claim
35 words
The development unit as claimed in claim 1, wherein said alkylene-oxide-addition type fluorine-containing surface active agent includes a moiety of ethylene oxide as repeat units ranging from 3 to 15 as said alkylene oxide thereof.
Claim 10
Dependent Claim
32 words
The development unit as claimed in claim 1, wherein said alkylene-oxide addition type fluorine-containing surface active agent is selected from the group consisting of nonionic, anionic, cationic and amphoteric surface active agents.
Claim 11
Dependent Claim
20 words
The development unit as claimed in claim 1, wherein said toner layer thickness regulation member further comprises an inorganic filler.
Claim 12
Dependent Claim
31 words
The development unit as claimed in claim 10, wherein said inorganic filler is selected from the group consisting of dry silica, wet silica, diatomaceous earth, ground quartz, titanium oxide and talc.
Claim 13
Dependent Claim
21 words
The development unit as claimed in claim 1, wherein said toner layer thickness regulation member is supported by an electroconductive holder.
Claim 14
Dependent Claim
18 words
The development unit as claimed in claim 1, wherein said toner layer thickness regulation member is a blade.
Claim 15
Dependent Claim
18 words
The development unit as claimed in claim 1, wherein said toner layer thickness regulation member is a roller.
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |