Patent US5399098A successfully refreshed from Google Patents.
US4921771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for use in developing electrostatic images containing polypropylene
Assignee: Konica Minolta Inc
•
Filing: 1988-01-19
•
Granted: 1990-05-01
•
Expires: 2008-01-19
Abstract
Abstract A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene having a number average molecular weight of about 3000 to 4000 in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.
Inventors
- 👤 Makoto Tomono
- 👤 Noriyoshi Tarumi
- 👤 Masayuki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:25
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783; G03G9/09791; G03G9/087; G03G9/08702; G03G9/08704; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08775; G03G9/08782; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104; Y10S430/105; Y10S524/00; Y10S524/901; Y10S525/00; Y10S525/934; Y10S526/00; Y10S526/934
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
A toner for developing latent electrostatic images comprising (a) a coloring agent, (b) a styrene homopolymer or copolymer of styrene with at least one acrylic comonomer, (c) polypropylene having a number average molecular weight of about 3,000 to about 4,000 in an amount of between about 1 to 10 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer, and (d) a charge control agent.
Claim 2
Dependent Claim
69 words
A toner for developing latent electrostatic images comprising (a) a coloring agent, (b) a styrene homopolymer or copolymer of styrene with at least one acrylic comonomer, (c) polypropylene having a number average molecular weight of about 3,000 to about 4,000 in an amount of between about 1 to 10 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer, and (d) a charge control agent.
Claim 3
Dependent Claim
33 words
The toner of claim 1 wherein said acrylic comonomer has the formula ##STR1## wherein, R 1 is H or alkyl R 2 is H, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl.
Claim 4
Dependent Claim
11 words
The toner of claim 2 wherein R is hydrogen or methyl.
Claim 5
Dependent Claim
12 words
The toner of claim 2 wherein R is unsubstituted alkyl or aryl.
Claim 6
Dependent Claim
22 words
The toner of claim 1 wherein said comonomer is taken from the class consisting of acrylic acid, methacrylic acid, and derivatives thereof.
Claim 7
Dependent Claim
56 words
The toner of claim 1 wherein said comonomer is taken from the class consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, dodecyl acrylate, octyl acrylate, chloroethyl acrylate, phenyl acrylate, stearyl acrylate, methyl chloroacrylate; methyl methacrylate, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate, octyl methacrylate, chloroethyl methacrylate, phenyl methacrylate, stearyl methacrylate, methyl chloromethacrylate, and mixtures thereof.
Claim 8
Dependent Claim
10 words
The toner of claim 1 further comprising a paraffin wax.
Claim 9
Dependent Claim
36 words
The toner of claim 7 wherein said paraffin wax is natural or synthetic C 15 to C 40 paraffin hydrocarbons which is normally solid and has a melting point of about 37° to about 65° C.
Claim 10
Dependent Claim
14 words
The toner of claim 7 further comprising a metal salt of a fatty acid.
Claim 11
Dependent Claim
100 words
The toner of claim 9 wherein said fatty acid metal salt is selected from the group consisting of a cadmium, barium, lead, iron, nickel, cobalt, copper, strontium, calcium or magnesium salt of stearic acid; a zinc, manganese, iron, cobalt, copper, lead or magnesium salt of oleic acid; a zinc, cobalt, copper, magnesium, aluminum or calcium salt of palmitic acid; a zinc, cobalt or calcium salt of palmitic acid; a zinc, cobalt or calcium salt of linoleic acid; a zinc or cadmiun salt or ricinolic acid; a lead salt of caprylic acid; a lead salt of caproic acid; and mixtures thereof.
Claim 12
Dependent Claim
68 words
A toner for developing latent electrostatic images comprising (a) a coloring agent, (b) a styrene homopolymer or a copolymer of styrene with at least one acrylic comonomer, (c) polypropylene having a number average molecular weight of about 3,000 to 4,000 in an amount of about 5 to 12 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer, and (d) a charge control agent.
Claim 13
Dependent Claim
68 words
A toner for developing latent electrostatic images comprising (a) a coloring agent, (b) a styrene homopolymer or a copolymer of styrene with at least one acrylic comonomer, (c) polypropylene having a number average molecular weight of about 3,000 to 4,000 in an amount of about 5 to 12 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer, and (d) a charge control agent.
References Cited (Backward Citations)
US3236639A
Cited
US3510338A
Cited
US3577345A
Cited
US3676350A
Cited
US3736257A
Cited
US3964903A
Cited
US4022738A
Cited
US4155883A
Cited
US4099968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |