US4528257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner powder and method of forming fixed images
Assignee: Canon Production Printing Netherlands BV
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Filing: 1983-06-09
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Granted: 1985-07-09
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Expires: 2003-06-09
Abstract
Abstract Toner powder the particles of which are composed of thermoplastic resin, coloring material and possibly other additives such as magnetically attractable material comprises as the principal resin a thermoplastic polymer containing in its molecule one or more each of mutually immiscible crystalline and amorphous polymeric blocks, the crystalline blocks forming the continuous phase in the polymer and having a melting point between 45° and 90° C. and the amorphous blocks having a Tg at least 10° C. above the melting point of the crystalline blocks. The toner powder is especially beneficial for use in a method of transferring and fixing powder images in which an image formed of the powder is softened by heating it on a medium having less surface adhesivity for the softened powder than has the image receiving material and the softened powder on this medium is brought into pressure-contact with substantially unheated image receiving material.
Inventors
- 👤 Arie Polderman
- 👤 Johannes W. H. Handels
- 👤 Johannes H. Kuit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:08
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08797; G03G9/08788
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
A toner powder consisting of heat-fusible particles composed of thermoplastic resin and coloring material with or without other additives, said resin comprising predominantly a thermoplastic block copolymer containing in its molecule at least 65% by weight of crystalline polymeric blocks and at least 5% by weight of amorphous polymeric blocks, said crystalline blocks and said amorphous blocks mutually being immiscible with one another and respectively forming in said block copolymer a continuous crystalline polymeric phase and a disperse amorphous polymeric phase, said crystalline blocks having a melting point between 45° and 90° C. and said amorphous blocks having a Tg at least 10° C. above the melting point of the crystalline blocks, said particles exhibiting a crystallization temperature reduction of between 20° and 40° C.
Claim 2
Dependent Claim
125 words
A toner powder consisting of heat-fusible particles composed of thermoplastic resin and coloring material with or without other additives, said resin comprising predominantly a thermoplastic block copolymer containing in its molecule at least 65% by weight of crystalline polymeric blocks and at least 5% by weight of amorphous polymeric blocks, said crystalline blocks and said amorphous blocks mutually being immiscible with one another and respectively forming in said block copolymer a continuous crystalline polymeric phase and a disperse amorphous polymeric phase, said crystalline blocks having a melting point between 45° and 90° C. and said amorphous blocks having a Tg at least 10° C. above the melting point of the crystalline blocks, said particles exhibiting a crystallization temperature reduction of between 20° and 40° C.
Claim 3
Dependent Claim
23 words
A toner powder according to claim 1, said crystalline blocks being polar and having a melting point of between 50° and 70° C.
Claim 4
Dependent Claim
20 words
A toner powder according to claim 1, said block copolymer containing 70 to 95% by weight of said crystalline blocks.
Claim 5
Dependent Claim
20 words
A toner powder according to claim 1, said amorphous blocks having a number-average molecular weight of between 10,000 and 25,000.
Claim 6
Dependent Claim
26 words
A toner powder according to claim 1, said block copolymer constituting at least 50% by weight of the total quantity of thermoplastic resin in said particles.
Claim 7
Dependent Claim
25 words
A toner powder according to claim 5, said thermoplastic resin consisting essentially of a mixture of said thermoplastic block copolymer and amorphous and/or crystalline homopolymer.
Claim 8
Dependent Claim
131 words
A toner powder consisting of heat-fusible particles composed of thermoplastic resin and coloring material with or without other additives, said resin consisting predominantly of a thermoplastic block copolymer containing 70 to 95% by weight of crystalline polymeric blocks of polyethylene oxide, polycaprolactone, or polypropylene oxide, having a melting point between about 50° and about 70° C. and 5 to 30% by weight of amorphous blocks of polystyrene, poly-α-methylstyrene, or polymethyl methacrylate, having a Tg at least 10° C. above the melting point of said crystalline blocks, said crystalline blocks and said amorphous blocks mutually being immiscible with one another and respectively forming in said block copolymer a continuous crystalline polymeric phase and a disperse amorphous polymeric phase, said powder particles exhibiting a crystallization temperature reduction of between 20° and 40° C.
Claim 9
Dependent Claim
131 words
A toner powder consisting of heat-fusible particles composed of thermoplastic resin and coloring material with or without other additives, said resin consisting predominantly of a thermoplastic block copolymer containing 70 to 95% by weight of crystalline polymeric blocks of polyethylene oxide, polycaprolactone, or polypropylene oxide, having a melting point between about 50° and about 70° C. and 5 to 30% by weight of amorphous blocks of polystyrene, poly-α-methylstyrene, or polymethyl methacrylate, having a Tg at least 10° C. above the melting point of said crystalline blocks, said crystalline blocks and said amorphous blocks mutually being immiscible with one another and respectively forming in said block copolymer a continuous crystalline polymeric phase and a disperse amorphous polymeric phase, said powder particles exhibiting a crystallization temperature reduction of between 20° and 40° C.
Claim 10
Dependent Claim
37 words
A toner powder according to claim 7, said block copolymer consisting essentially of about 70 to 80% by weight of crystalline blocks of polyethylene oxide and about 20 to 30% by weight of amorphous blocks of polystyrene.
Claim 11
Dependent Claim
34 words
A toner powder according to claim 8, said resin consisting essentially of a mixture of at least 70% by weight of said block copolymer and minor proportions of polyethylene oxide homopolymer and polystyrene homopolymer.
Claim 12
Dependent Claim
40 words
A toner powder according to claim 7, said block copolymer consisting essentially of about 70 to 80% by weight of crystalline blocks of polycaprolactone and about 20 to 30% by weight of amorphous blocks of polystyrene, poly-α-methylstyrene, or polymethyl methacrylate.
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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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |