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US4522686A
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Aqueous sizing compositions
Assignee: Hercules LLC
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Filing: 1983-07-07
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Granted: 1985-06-11
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Expires: 2003-07-07
Abstract
Abstract Described are sizing compositions in the form of aqueous dispersions comprising a hydrophobic cellulose-reactive sizing agent such as a ketene dimer, fortified rosin and a water-soluble, nitrogen-containing cationic dispersing agent. The compositions are highly efficient internal or surface sizing agents for paper and maximize the advantages of each sizing component while minimizing the disadvantages.
Inventors
- 👤 David H. Dumas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:28
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; D21H17/15; D21H17/07; D21H17/08; D21H17/17; D21H17/62
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
As a composition of matter, a cationic aqueous dispersion having as the continuous phase an aqueous solution containing at least one water-soluble nitrogen-containing cationic dispersing agent and as the dispersed phase (a) finely divided particles of fortified rosin and (b) finely divided particles of a hydrophobic, cellulose-reactive ketene dimer sizing agent, the weight ratio of (a):(b) in said dispersed phase being within the range of 0.1:1 to 10:1, and the amount of dispersing agent being within the range of about 5 to about 140% based on the weight of the dispersed phase.
Claim 2
Dependent Claim
92 words
As a composition of matter, a cationic aqueous dispersion having as the continuous phase an aqueous solution containing at least one water-soluble nitrogen-containing cationic dispersing agent and as the dispersed phase (a) finely divided particles of fortified rosin and (b) finely divided particles of a hydrophobic, cellulose-reactive ketene dimer sizing agent, the weight ratio of (a):(b) in said dispersed phase being within the range of 0.1:1 to 10:1, and the amount of dispersing agent being within the range of about 5 to about 140% based on the weight of the dispersed phase.
Claim 3
Dependent Claim
27 words
The composition of claim 1 in which the aqueous dispersion also contains from about 25 to about 200% alum based on the weight of fortified rosin particles.
Claim 4
Dependent Claim
25 words
The composition of claim 1 in which the ketene dimer is an alkyl ketene dimer wherein the alkyl group contains at least 8 carbon atoms.
Claim 5
Dependent Claim
37 words
The composition of claim 3 in which the dispersing agent is selected from the group consisting of cationic starches and the resinous reaction products of epichlorohydrin with an aminopolyamide, an alkylenepolyamine, a poly(diallylamine) or a dicyandiamide-polyalkylenepolyamine condensate.
Claim 6
Dependent Claim
28 words
A method of sizing paper or paper board from cellulose stock which comprises applying as a size in a papermaking machine sizing process, the composition of claim 1.
Claim 7
Dependent Claim
14 words
The method of claim 5 wherein the sizing process is an internal sizing process.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein the sizing process is a surface sizing process.
Claim 9
Dependent Claim
30 words
The composition of claim 4 in which the amount of dispersion agent is within the range of about 40% to about 100% based on the weight of the dispersed phase.
Claim 10
Dependent Claim
27 words
The composition of claim 8 in which the aqueous dispersion also contains from about 75% to about 150% alum based on the weight of fortified rosin particles.
Claim 11
Dependent Claim
28 words
A method of sizing paper or paper board from cellulose stock which comprises applying as a size in a papermaking machine sizing process, the composition of claim 9.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |