Patent US4243481A successfully refreshed from Google Patents.
US4243481A
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Sizing compositions
Assignee: Hercules LLC
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Filing: 1978-08-09
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Granted: 1981-01-06
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Expires: 1998-08-09
Abstract
Abstract Disclosed is a sizing composition in the form of an aqueous emulsion comprising a hydrophobic cellulose-reactive sizing agent, such as a ketene dimer, and a cationic polymer selected from the group consisting of (1) a cationic polymer obtained by reacting an epihalohydrin with a condensate derived by condensing dicyandiamide or cyanamide with bis-aminopropylpiperazine and (2) a cationic polymer obtained by condensing an epihalohydrin with bis-aminopropylpiperazine. The cationic polymer is a sizing accelerator for the sizing agent.
Inventors
- 👤 David H. Dumas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:42
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55; C; C08; C08G; C08G73/00; C08G73/02; C08G73/0273; D21H17/03; D21H17/05; D21H17/17
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
In the method of internally or externally sizing paper with a hydrophobic cellulose-reactive sizing agent selected from the group consisting of ketene dimers, acid anhydrides, and organic isocyanates wherein there is employed in combination therewith a sizing accelerator, the improvement wherein there is employed as the sizing accelerator a cationic polymer selected from the group consisting of (1) a cationic polymer obtained by reacting an epihalohydrin with (i) a condensate derived by the condensation of bis-aminopropylpiperazine and dicyandiamide in a mole ratio of bis-aminopropylpiperazine to dicyandiamide of from about 0.5:1 to 1:0.5 or (ii) a condensate derived by the condensation of bis-aminopropylpiperazine and cyanamide in a mole ratio of bis-aminopropylpiperazine to cyanamide of from about 0.5:2 to 1:1, the amount of epihalohydrin employed being from 0.3 mole to 2 moles for each mole of amine nitrogen present in the condensate and (2) a cationic polymer obtained by the condensation of bis-aminopropylpiperazine and an epihalohydrin in a mole ratio of bis-aminopropylpiperazine to epihalohydrin of 1:3 to 1:8, the amount of sizing accelerator employed being an amount sufficient to increase the off-the-machine sizing properties of the sizing agent.
Claim 2
Dependent Claim
186 words
In the method of internally or externally sizing paper with a hydrophobic cellulose-reactive sizing agent selected from the group consisting of ketene dimers, acid anhydrides, and organic isocyanates wherein there is employed in combination therewith a sizing accelerator, the improvement wherein there is employed as the sizing accelerator a cationic polymer selected from the group consisting of (1) a cationic polymer obtained by reacting an epihalohydrin with (i) a condensate derived by the condensation of bis-aminopropylpiperazine and dicyandiamide in a mole ratio of bis-aminopropylpiperazine to dicyandiamide of from about 0.5:1 to 1:0.5 or (ii) a condensate derived by the condensation of bis-aminopropylpiperazine and cyanamide in a mole ratio of bis-aminopropylpiperazine to cyanamide of from about 0.5:2 to 1:1, the amount of epihalohydrin employed being from 0.3 mole to 2 moles for each mole of amine nitrogen present in the condensate and (2) a cationic polymer obtained by the condensation of bis-aminopropylpiperazine and an epihalohydrin in a mole ratio of bis-aminopropylpiperazine to epihalohydrin of 1:3 to 1:8, the amount of sizing accelerator employed being an amount sufficient to increase the off-the-machine sizing properties of the sizing agent.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the epihalohydrin used to prepare the cationic polymers (1) and (2) is epichlorohydrin.
Claim 4
Dependent Claim
170 words
In the method of internally or externally sizing paper with a hydrophobic cellulose-reactive sizing agent selected from the group consisting of ketene dimers, acid anhydrides, and organic isocyanates wherein there is employed in combination therewith a sizing accelerator, the improvement wherein there is employed as the sizing accelerator a cationic polymer selected from the group consisting of (1) a cationic polymer obtained by reacting epichlorohydrin with (i) a condensate derived by the condensation of bis-aminopropylpiperazine and dicyandiamide in a mole ratio of 1:1 or (ii) a condensate derived by the condensation of bis-aminopropylpiperazine and cyanamide in a mole ratio of bis-aminopropylpiperazine to cyanamide of 1:2, the amount of epichlorohydrin employed being from 1 mole to 1.5 moles for each mole of amine nitrogen present in the condensate and (2) a cationic polymer obtained by the condensation of bis-aminopropylpiperazine and epichlorohydrin in a mole ratio of bis-aminopropylpiperazine to epichlorohydrin of 1:4, the amount of sizing accelerator employed being an amount sufficient to increase the off-the-machine sizing properties of the sizing agent.
Claim 5
Dependent Claim
170 words
In the method of internally or externally sizing paper with a hydrophobic cellulose-reactive sizing agent selected from the group consisting of ketene dimers, acid anhydrides, and organic isocyanates wherein there is employed in combination therewith a sizing accelerator, the improvement wherein there is employed as the sizing accelerator a cationic polymer selected from the group consisting of (1) a cationic polymer obtained by reacting epichlorohydrin with (i) a condensate derived by the condensation of bis-aminopropylpiperazine and dicyandiamide in a mole ratio of 1:1 or (ii) a condensate derived by the condensation of bis-aminopropylpiperazine and cyanamide in a mole ratio of bis-aminopropylpiperazine to cyanamide of 1:2, the amount of epichlorohydrin employed being from 1 mole to 1.5 moles for each mole of amine nitrogen present in the condensate and (2) a cationic polymer obtained by the condensation of bis-aminopropylpiperazine and epichlorohydrin in a mole ratio of bis-aminopropylpiperazine to epichlorohydrin of 1:4, the amount of sizing accelerator employed being an amount sufficient to increase the off-the-machine sizing properties of the sizing agent.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein the sizing agent is a ketene dimer and the sizing accelerator is cationic polymer (1).
Claim 7
Dependent Claim
21 words
The method of claim 3 wherein the sizing agent is a ketene dimer and the sizing accelerator is cationic polymer (2).
Claim 8
Dependent Claim
21 words
The method of claim 3 wherein the sizing agent is an acid anhydride and the sizing accelerator is cationic polymer (1).
Claim 9
Dependent Claim
21 words
The method of claim 3 wherein the sizing agent is an acid anhydride and the sizing accelerator is cationic polymer (2).
Claim 10
Dependent Claim
21 words
The method of claim 3 wherein the sizing agent is an organic isocyanate and the sizing accelerator is cationic polymer (1).
Claim 11
Dependent Claim
21 words
The method of claim 3 wherein the sizing agent is an organic isocyanate and the sizing accelerator is cationic polymer (2).
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |