US5558809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer electrets with improved charge stability
Assignee: Invista North America LLC
•
Filing: 1995-10-10
•
Granted: 1996-09-24
•
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 02:09
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##
References Cited (Backward Citations)
US2740184A
Cited
US3571679A
Cited
US4215682A
Cited
US4308223A
Cited
JPS56138715A
Cited
US4375718A
Cited
JPS5978361A
Cited
US4944854A
Cited
US4623438A
Cited
US4789504A
Cited
JPS6242716A
Cited
US5073579A
Cited
US5057710A
Cited
US5187038A
Cited
DE4031705A1
Cited
US5475119A
Cited
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 |