Patent US4522686A successfully refreshed from Google Patents.
US4522686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous sizing compositions
Assignee: Hercules LLC
•
Filing: 1983-07-07
•
Granted: 1985-06-11
•
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
2026-11-09 03:33
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.
References Cited (Backward Citations)
US3130118A
Cited
US3212961A
Cited
US3957574A
Cited
US3966654A
Cited
US4017431A
Cited
GB1533434A
Cited
US4222820A
Cited
US4243481A
Cited
US4302283A
Cited
US4240935A
Cited
JPS55132799A
Cited
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 |