Patent US5558809A successfully refreshed from Google Patents.
US5558809A
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Polymer electrets with improved charge stability
Assignee: Invista North America LLC
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Filing: 1995-10-10
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Granted: 1996-09-24
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Expires: 2015-10-10
Abstract
Abstract The use of additives to produce polymer electrets with improved charge stability. In particular, the invention relates to the use of specific charge control agents used for toners that are blended with various polymers at suitable concentrations to enhance the charge lifetime of the electrets. The charge control agents include a triphenylmethane compound, a polymeric ammonium compound, and arylsulfide compound and azochromium complex.
Inventors
- 👤 Werner Groh
- 👤 Hans-Tobias Macholdt
- 👤 Baylor D. Gibson
- 👤 James R. Walden
- 👤 Clinton D. Felton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:34
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B03; B03C; B03C3/00; B03C3/28; H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; B01D2239/00; B01D2239/04; B01D2239/0407; B01D2239/0435; B01D2239/0471; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A polymer electret having a significant fraction of field-induced polarization after removal of a polarizing field comprising a mixture of (a) a polymer selected from the group consisting of polypropylene, polyethylene, and polyesters; and (b) a charge control agent selected from the group consisting of a triphenylmethane having the formula ##STR5## an arylsulfide compound having the formula ##STR6## and an azochromium complex having the formula ##STR7##
Claim 2
Dependent Claim
66 words
A polymer electret having a significant fraction of field-induced polarization after removal of a polarizing field comprising a mixture of (a) a polymer selected from the group consisting of polypropylene, polyethylene, and polyesters; and (b) a charge control agent selected from the group consisting of a triphenylmethane having the formula ##STR5## an arylsulfide compound having the formula ##STR6## and an azochromium complex having the formula ##STR7##
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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) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |