Patent US3271598A successfully refreshed from Google Patents.
Patent US5225308A successfully refreshed from Google Patents.
US5225308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated toner for heat-and-pressure fixing
Assignee: Kao Corp
•
Filing: 1991-04-04
•
Granted: 1993-07-06
•
Expires: 2011-04-04
Abstract
Abstract An encapsulated toner for heat-and-pressure fixing which is composed of a heat-fusible core containing at least a coloring material and a shell formed so as to cover the surface of the core, wherein the main component of the shell is a resin prepared by reacting an iso(thio)cyanate compound comprising (1) 0 to 30 mole % of monovalent isocyanate and/or isothiocyanate compounds and (2) 100 to 70 mole % of at least divalent isocyanate and/or isothiocyanate compounds with an active hydrogen compound comprising (3) 0 to 30 mole % of a compound having one active hydrogen atom reactive with isocyanate and/or isothiocyanate groups and (4) 100 to 70 mole % of a compound having at least two active hydrogen atoms reactive with isocyanate and/or isothiocyanate groups at a molar ratio of the components (1) and (2) to the components (3) and (4) of between 1:1 and 1:20, and wherein at least 30% of the whole linkages in which an isocyanate or isothiocyanate group participates are thermally dissociating linkages. This toner is excellent in blocking resistance and triboelectric properties and enables low-energy fixing.
Inventors
- 👤 Mitsuhiro Sasaki
- 👤 Kuniyasu Kawabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09307; G03G9/09314; G03G9/09328
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
219 words
An encapsulated toner for heat-and-pressure fixing, comprising a heat-fusible core containing at least a coloring material and a shell formed so as to cover the surface of the core, wherein the main component of the shell is a resin prepared by reacting: (A) an iso(thio)cyanate compound comprising (1) 0 to 30 mole % of monovalent isocyanate and/or isothiocyanate compounds and (2) 100 to 70 mole % of at least divalent isocyanate and/or isothiocyanate compounds; with (B) an active hydrogen compound comprising (3) 0 to 30 mole % of a compound having one active hydrogen atom reactive with isocyanate and/or isothiocyanate groups and (4) 100 to 70 mole % of a compound having at least two active hydrogen atoms reactive with isocyanate and/or isothiocyanate groups at a molar ratio of component A to component B of between 1:1 and 1:20 and wherein at least 30% of all of the linkages formed from an isocyanate or isothiocyanate group are thermally dissociating linkages which are formed by the reaction of a phenolic hydroxyl or thio group with an isocyanate or isothiocyanate group; said heat fusible core comprising, as a main component thereof, a thermoplastic resin having a glass transition temperature in the range of 10°-50° C.; and said encapsulated toner having a softening point in the range of 80° to 150° C.
Claim 2
Dependent Claim
219 words
An encapsulated toner for heat-and-pressure fixing, comprising a heat-fusible core containing at least a coloring material and a shell formed so as to cover the surface of the core, wherein the main component of the shell is a resin prepared by reacting: (A) an iso(thio)cyanate compound comprising (1) 0 to 30 mole % of monovalent isocyanate and/or isothiocyanate compounds and (2) 100 to 70 mole % of at least divalent isocyanate and/or isothiocyanate compounds; with (B) an active hydrogen compound comprising (3) 0 to 30 mole % of a compound having one active hydrogen atom reactive with isocyanate and/or isothiocyanate groups and (4) 100 to 70 mole % of a compound having at least two active hydrogen atoms reactive with isocyanate and/or isothiocyanate groups at a molar ratio of component A to component B of between 1:1 and 1:20 and wherein at least 30% of all of the linkages formed from an isocyanate or isothiocyanate group are thermally dissociating linkages which are formed by the reaction of a phenolic hydroxyl or thio group with an isocyanate or isothiocyanate group; said heat fusible core comprising, as a main component thereof, a thermoplastic resin having a glass transition temperature in the range of 10°-50° C.; and said encapsulated toner having a softening point in the range of 80° to 150° C.
Claim 3
Dependent Claim
161 words
The encapsulated toner for heat-and-pressure fixing as set forth in claim 1, wherein the compound having a phenolic hydroxyl group is at least one compound selected from among those represented by the following formulas (I), (II) and (III): ##STR5## wherein R 1 , R 2 , R 3 , R 4 and R 5 each independently represent a hydrogen atom, an alkyl group having 1 to 9 carbon atoms, an alkenyl, alkoxy, alkanoyl, carboalkoxy or aryl group or a halogen atom; ##STR6## wherein R 6 , R 7 , R 8 and R 9 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl, alkoxy, alkanoyl, carboalkoxy or aryl group or a halogen atom; ##STR7## wherein R 10 , R 11 , R 12 and R 13 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl, alkoxy, alkanoyl, carboalkoxy or aryl group or a halogen atom.
Claim 4
Dependent Claim
26 words
The encapsulated toner for heat-and-pressure fixing as set forth in claim 1, wherein the thermoplastic resin contained in the heat-fusible core is mainly a vinyl resin.
Claim 5
Dependent Claim
31 words
The encapsulated toner for heat-and-pressure fixing as set forth in claim 1, wherein the isocyanate group to be reacted with a phenolic hydroxyl group is directly bonded to an aromatic ring.
References Cited (Backward Citations)
US2297691A
Cited
US2357809A
Cited
US3269626A
Cited
US4977052A
Cited
GB2107892A
Cited
GB2135469A
Cited
US4520091A
Cited
US4833057A
Cited
US4636451A
Cited
US4973541A
Cited
US5037716A
Cited
US5082757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |