US4845004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidity improver for positively-charging resin powder
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1988-05-16
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Granted: 1989-07-04
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Expires: 2008-05-16
Abstract
Abstract There is disclosed a hydrophobic silica-type micropowder comprising silica-type microparticles which have been treated with certain secondary or tertiary amine-functional silanes. When the micropowder is combined with a positively-charging resin powder, such as a toner, the fluidity of the resin powder is substantially increased and this improved fluidity is retained upon long term storage.
Inventors
- 👤 Hideki Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:19
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09716; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
A composition comprising: hydrophobic silica-type microparticles prepared by the treatment of silica-type microparticles with a silane having the general formula ##STR9## wherein R is selected from the group consisting of an alkyl group having 1 to 10 carbon atoms and a phenyl group, R 1 is selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms and a phenyl group, R 2 is an alkylene group having 1 to 6 carbon atoms, R 3 is selected from the group consisting of an alkyl group having 1 to 10 carbon atoms and a phenyl group, R 4 is an alkyl group having 1 to 4 carbon atoms and n is 1 or 2, with the proviso that the sum of the number of carbons in groups R plus R 2 is at least 5 when R 1 is hydrogen.
Claim 2
Dependent Claim
146 words
A composition comprising: hydrophobic silica-type microparticles prepared by the treatment of silica-type microparticles with a silane having the general formula ##STR9## wherein R is selected from the group consisting of an alkyl group having 1 to 10 carbon atoms and a phenyl group, R 1 is selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms and a phenyl group, R 2 is an alkylene group having 1 to 6 carbon atoms, R 3 is selected from the group consisting of an alkyl group having 1 to 10 carbon atoms and a phenyl group, R 4 is an alkyl group having 1 to 4 carbon atoms and n is 1 or 2, with the proviso that the sum of the number of carbons in groups R plus R 2 is at least 5 when R 1 is hydrogen.
Claim 3
Dependent Claim
23 words
The composition of claim 1, wherein R 3 and R 4 are each selected from the group consisting of methyl and ethyl groups.
Claim 4
Dependent Claim
37 words
The composition of claim 2, wherein R is an alkyl group having 1 to 4 carbon atoms and R 1 is selected from the group consisting of hydrogen and alkyl groups having 1 to 4 carbon atoms.
Claim 5
Dependent Claim
27 words
The composition of claim 1, wherein 1 to 50 parts by weight of said silane are used to treat 100 parts by weight of said silica-type microparticles.
Claim 6
Dependent Claim
27 words
The composition of claim 2, wherein 1 to 50 parts by weight of said silane are used to treat 100 parts by weight of said silica-type microparticles.
Claim 7
Dependent Claim
27 words
The composition of claim 3, wherein 1 to 50 parts by weight of said silane are used to treat 100 parts by weight of said silica-type microparticles.
Claim 8
Dependent Claim
12 words
The composition of claim 4, wherein said silica-type microparticles are fumed silica.
Claim 9
Dependent Claim
12 words
The composition of claim 5, wherein said silica-type microparticles are fumed silica.
Claim 10
Dependent Claim
12 words
The composition of claim 6, wherein said silica-type microparticles are fumed silica.
Claim 11
Dependent Claim
24 words
The composition of claim 1, further comprising a positively-charging resin powder, said silane constituting from 0.1 to 5 percent by weight of the combination.
Claim 12
Dependent Claim
24 words
The composition of claim 2, further comprising a positively-charging resin powder, said silane constituting from 0.1 to 5 percent by weight of the combination.
Claim 13
Dependent Claim
24 words
The composition of claim 3, further comprising a positively-charging resin powder, said silane constituting from 0.1 to 5 percent by weight of the combination.
Claim 14
Dependent Claim
13 words
The composition of claim 10, wherein said positively-charging resin powder is a toner.
Claim 15
Dependent Claim
13 words
The composition of claim 11, wherein said positively-charging resin powder is a toner.
Claim 16
Dependent Claim
13 words
The composition of claim 12, wherein said positively-charging resin powder is a toner.
References Cited (Backward Citations)
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 |