Patent US4240935A successfully refreshed from Google Patents.
US4240935A
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Ketene dimer paper sizing compositions
Assignee: Hercules LLC
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Filing: 1978-12-22
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Granted: 1980-12-23
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Expires: 1998-12-22
Abstract
Abstract Improved paper sizing compositions are composed of a ketene dimer, an anionic dispersing agent such as sodium lignin sulfonate, certain water-soluble, cationic resins and water. Exemplary of the cationic resins is the reaction product of epichlorohydrin and the aminopolyamide derived from adipic acid and diethylenetriamine.
Inventors
- 👤 David H. Dumas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:48
CPC Classifications
C; C08; C08L; C08L77/00; C08L77/06; C08L79/00; C08L79/02; D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/17
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
As an improved paper sizing composition, a ketene dimer dispersion consisting essentially of said dimer, an anionic dispersing agent selected from the group consisting of sodium lignin sulfonate, the condensation product of formaldehyde and sodium naphthalene sulfonate and mixtures thereof, a cationic resin which is the reaction product of epichlorohydrin with a polymer selected from the group consisting of (a) an aminopolyamide derived from a dicarboxylic acid and a polyalkylene polyamine having two primary amine groups and at least one secondary or tertiary amine group or (b) a condensate of cyanamide or dicyandiamide with a polyalkylene polyamine having the formula H 2 N(C n H 2n NH) x H, wherein n is an integer 2 through 8 and x is an integer 2 or more, and water.
Claim 2
Dependent Claim
127 words
As an improved paper sizing composition, a ketene dimer dispersion consisting essentially of said dimer, an anionic dispersing agent selected from the group consisting of sodium lignin sulfonate, the condensation product of formaldehyde and sodium naphthalene sulfonate and mixtures thereof, a cationic resin which is the reaction product of epichlorohydrin with a polymer selected from the group consisting of (a) an aminopolyamide derived from a dicarboxylic acid and a polyalkylene polyamine having two primary amine groups and at least one secondary or tertiary amine group or (b) a condensate of cyanamide or dicyandiamide with a polyalkylene polyamine having the formula H 2 N(C n H 2n NH) x H, wherein n is an integer 2 through 8 and x is an integer 2 or more, and water.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein the ketene dimer is a mixture of hexadecyl and octadecyl ketene dimers.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the anionic dispersing agent is sodium lignin sulfonate.
Claim 5
Dependent Claim
20 words
The composition of claim 1 wherein the anionic dispersing agent is the condensation product of formaldehyde and sodium naphthalene sulfonate.
Claim 6
Dependent Claim
41 words
The composition of claim 1 wherein the cationic resin is the reaction product of epichlorohydrin and an aminopolyamide derived from a dicarboxylic acid and a polyalkylene polyamine having two primary amine groups and at least one secondary or tertiary amine group.
Claim 7
Dependent Claim
15 words
The composition of claim 5 wherein the aminopolyamide is derived from adipic acid and diethylenetriamine.
Claim 8
Dependent Claim
52 words
The composition of claim 1 wherein the cationic resin is the reaction product of epichlorohydrin and the condensate of dicyandiamide with a polyalkylene polyamine having the formula H 2 N(C n H 2n NH) x H, wherein n is an integer 2 through 8 and x is an integer 2 or more.
Claim 9
Dependent Claim
12 words
The composition of claim 7 wherein the the polyalkylene polyamine is diethylenetriamine.
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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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |