Patent US5019622A successfully refreshed from Google Patents.
US5019622A
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Rosin modified styrene acrylic resin
Assignee: RESINALL Corp 3065 HIGH RIDGE RD STAMFORD CT 06905 A CORP OF
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Filing: 1989-01-19
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Granted: 1991-05-28
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Expires: 2009-01-19
Abstract
Abstract A rosin modified acrylic resin for use in a toner composition is provided. The resin is prepared by steam stripping a mixture of solution polymerized styrene-acrylic copolymer rosin, and a suitable solvent, such as toluene or xylene, followed by cooling and grinding to form the styrene acrylic-rosin resin. This binder resin can be used in a toner composition which, due to the resin, has an inherent positive charge of at least 2.0.
Inventors
- 👤 Roger E. Burke
- 👤 James G. Spruill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:13
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; C; C08; C08F; C08F8/00; G03G9/08702; G03G9/08706; G03G9/08708; G03G9/08711; C08F2810/00; C08F2810/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
24 words
A rosin modified styrene acrylic copolymer resin comprising the heat reaction product of a solution polymerized styrene acrylic copolymer and rosin; and a solvent.
Claim 2
Dependent Claim
24 words
A rosin modified styrene acrylic copolymer resin comprising the heat reaction product of a solution polymerized styrene acrylic copolymer and rosin; and a solvent.
Claim 3
Dependent Claim
13 words
The resin of claim 1 wherein said solvent is removed by steam stripping.
Claim 4
Dependent Claim
18 words
The resin of claim 1 wherein said solvent is selected from the group consisting of toluene and xylene.
Claim 5
Dependent Claim
11 words
The resin of claim 1 wherein the rosin is gum rosin.
Claim 6
Dependent Claim
31 words
The resin of claim 1 wherein said styrene acrylic copolymer is formed from an acrylic co-monomer selected from the group consisting of ethyl acrylate, ethyl methacrylate, butyl acrylate, and butyl methacrylate.
Claim 7
Dependent Claim
12 words
The resin of claim 1 wherein said resin has a positive charge.
Claim 8
Dependent Claim
14 words
The resin of claim 6 wherein said positive charge is at least 2.0 volts/g.
Claim 9
Dependent Claim
33 words
The resin of claim 1 wherein the styrene acrylic copolymer is between 55% and 91% of the copolymer and rosin and the rosin is between 9% and 45% of the copolymer and rosin.
Claim 10
Dependent Claim
9 words
The resin of claim 1, further including a glycol.
Claim 11
Dependent Claim
11 words
The resin of claim 9 wherein the glycol is ethylene glycol.
Claim 12
Dependent Claim
10 words
The resin of claim 1 and further including a polyol.
Claim 13
Independent Claim
104 words
A method for preparing a rosin modified styrene acrylic copolymer resin suitable for use in a toner binder composition comprising the steps of: (a) copolymerizing, in a solvent, acrylic monomers by vinyl addition polymerization with up to 10 weight percent of acrylic acid or methacrylic acid to provide an acid-modified acrylic polymer; (b) adding rosin to the copolymerized acrylic monomers; (c) stirring the mixture obtained in step (b) until a homogeneous solution is obtained; (d) stripping the solvent from the homogeneous solution with heat, under reduced pressure, to obtain a copolymerized resin melt, and; (e) cooling the resin melt and flaking the solid resin.
Claim 14
Independent Claim
104 words
A method for preparing a rosin modified styrene acrylic copolymer resin suitable for use in a toner binder composition comprising the steps of: (a) copolymerizing, in a solvent, acrylic monomers by vinyl addition polymerization with up to 10 weight percent of acrylic acid or methacrylic acid to provide an acid-modified acrylic polymer; (b) adding rosin to the copolymerized acrylic monomers; (c) stirring the mixture obtained in step (b) until a homogeneous solution is obtained; (d) stripping the solvent from the homogeneous solution with heat, under reduced pressure, to obtain a copolymerized resin melt, and; (e) cooling the resin melt and flaking the solid resin.
Claim 15
Dependent Claim
25 words
The method of claim 12 wherein the acrylic monomers are selected from the group consisting of ethyl acrylate, ethyl methacrylate, butyl acrylate, and butyl methacrylate.
Claim 16
Dependent Claim
26 words
The method of claim 12 further including the step of adding a co-monomer selected from the group consisting of styrene and acrylonitrile during said copolymerizing step.
Claim 17
Dependent Claim
18 words
The method of claim 12 wherein the step of stripping the solvent includes a final steam stripping stage.
Claim 18
Dependent Claim
24 words
The method of claim 12 wherein during said stripping step the mixture is heated to a temperature of between 220° C. and 290° C.
Claim 19
Dependent Claim
25 words
The method of claim 16 wherein during said steam stripping step the mixture is heated to a temperature of between 240° C. and 260° C.
Claim 20
Dependent Claim
13 words
The method of claim 17 wherein said mixture is heated to 250° C.
Claim 21
Dependent Claim
52 words
A rosin modified styrene acrylic copolymer resin prepared by the method of claim 13 wherein said resin exhibits a single glass transition temperature intermediate to the glass transition temperatures of the acrylic polymer and the rosin, and wherein said resin is compatible with lacquer resins both in solution and in film form.
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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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |