US5051331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner
Assignee: Canon Inc
•
Filing: 1989-12-28
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Granted: 1991-09-24
•
Expires: 2009-12-28
Abstract
Abstract A toner for developing electrostatic latent images includes a binding resin, such as a crosslinked styreneacrylate ester copolymer, and a low-molecular weight olefin copolymer, the low-molecular weight polyolefin copolymer having at least two olefinic repeating units and having two or more peaks of melting at temperatures between 90° C. and 170° C.
Inventors
- 👤 Kiichiro Sakashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:09
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; G03G9/08704
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
47 words
A toner for developing electrostatic latent images, comprising a binding resin and a low-molecular weight olefin copolymer, said low-molecular weight olefin copolymer having at least two olefin monomer repeating units and having two or more peaks of melting at temperatures ranging between 90° C. and 170° C.
Claim 2
Dependent Claim
47 words
A toner for developing electrostatic latent images, comprising a binding resin and a low-molecular weight olefin copolymer, said low-molecular weight olefin copolymer having at least two olefin monomer repeating units and having two or more peaks of melting at temperatures ranging between 90° C. and 170° C.
Claim 3
Dependent Claim
18 words
A toner according to claim 1, wherein said low-molecular weight olefin copolymer comprises a low-molecular weight propylenic copolymer.
Claim 4
Dependent Claim
48 words
A toner according to claim 3, wherein said low-molecular weight olefin copolymer comprises a propylenic copolymer selected from the group consisting of a low-molecular weight propylene-ethylene copolymer, a low-molecular weight propylene-butene copolymer, a low-molecular weight propylene-pentene copolymer, a low-molecular weight propylene-4-methylpentene-l copolymer, and a low-molecular weight propylene-ethylene-butene copolymer.
Claim 5
Dependent Claim
22 words
A toner according to claim 2, wherein said low-molecular weight propylenic copolymer has an olefin content of 85 to 99.5 wt %.
Claim 6
Dependent Claim
27 words
A toner according to claim 1, wherein said low-molecular weight olefin copolymer has two or more peaks of melting at temperatures between 115° C. and 160° C.
Claim 7
Dependent Claim
22 words
A toner according to claim 1, wherein said low-molecular weight olefin copolymer has a weight average molecular weight between 1,000 and 15,000.
Claim 8
Dependent Claim
22 words
A toner according to claim 1, wherein said low-molecular weight olefin copolymer has a weight average molecular weight between 2,000 and 10,000.
Claim 9
Dependent Claim
32 words
A toner according to claim 1, wherein said low-molecular weight olefin copolymer is present in amounts from 0.5 to 10 parts by weight per 100 parts by weight of said binding resin.
Claim 10
Dependent Claim
32 words
A toner according to claim 1, wherein said low-molecular weight olefin copolymer is present in amounts from 1 to 7 parts by weight per 100 parts by weight of said binding resin.
Claim 11
Dependent Claim
17 words
A toner according to claim 1, wherein said binding resin comprises a crosslinked styrene-acrylate ester type copolymer.
Claim 12
Dependent Claim
17 words
A toner according to claim 1, wherein said binding resin comprises a crosslinked styrene-methacrylate ester type copolymer.
Claim 13
Dependent Claim
15 words
A toner according to claim 1, wherein said binding resin comprises a crosslinked polyester resin.
Claim 14
Dependent Claim
29 words
A toner according to claim 1, wherein said low-molecular olefin copolymer has been subjected to a heat treatment conducted at 180° to 300° C. for 0.5 to 20 minutes.
Claim 15
Dependent Claim
29 words
A toner according to claim 1, wherein said low-molecular olefin copolymer has been subjected to a heat treatment conducted at 200° to 250° C. for 0.5 to 10 minutes.
Claim 16
Dependent Claim
69 words
A toner according to claim 1, wherein 100 parts by weight of said binding resin comprising crosslinked styrene-acrylate ester type copolymer and 1 to 7 parts by weight of low-molecular weight propylene-ethylene copolymer are present, said low-molecular weight propylene-ethylene copolymer having been subjected to a heat treatment conducted at 180° to 300° C. for 0.5 to 20 minutes and having a weigh average molecular weight of 2,000 to 10,000.
Claim 17
Dependent Claim
69 words
A toner according to claim 1, wherein 100 parts by weight of said binding resin comprising crosslinked styrene-methacrylate ester type copolymer and 1 to 7 parts by weight of low-molecular weight propylene-ethylene copolymer are present, said low-molecular weight propylene-ethylene copolymer having been subjected to a heat treatment conducted at 180° to 300° C. for 0.5 to 20 minutes and having a weight average molecular weight of 2,000 to 10,000.
Claim 18
Dependent Claim
67 words
A toner according to claim 1, wherein 100 parts by weight of said binding resin comprising crosslinked polyester resin and 1 to 7 parts by weight of low-molecular weight propylene-ethylene copolymer are present, said low-molecular weight propylene-ethylene copolymer having been subjected to a heat treatment conducted at 180° to 300° C. for 0.5 to 20 minutes and having a weight average molecular weight of 2,000 to 10,000.
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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) | 1994-09-23 | 1995-03-25 | 1995-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-23 | 1999-03-25 | 1999-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-23 | 2003-03-25 | 2003-09-24 | $7700.00 | Window Closed / Lapsed |