Patent US3640841A successfully refreshed from Google Patents.
US3640841A
Expired / Lapsed
US
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Method for controlling adhesion of paper on yankee drier with polyamides and resultant products
Assignee: Hexion Inc
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Filing: 1969-04-29
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Granted: 1972-02-08
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Expires: 1989-04-29
Abstract
Abstract This invention relates to a paper manufacturing process which comprises drying the formed web against a heated surface, such as present on a Yankee drier, and in particular to the improvement which comprises incorporating in said web before said drying, in an amount sufficient to achieve uniform adhesion to and release from said heated surface, a water-dispersible repulpable polyamide polyamine resin containing at least two primary amine groups and at least one secondary or tertiary amine group such as the polyamide which results from the reaction of diethylene triamine with isopthalic acid.
Inventors
- 👤 Alfred Edwards Winslow
- 👤 John Calvin Spicer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:11
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/146; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
15 words
The improvement of claim 1 wherein the repulpable resin is incorporated in the pulp dispersion.
Claim 2
Dependent Claim
41 words
The improvement of claim 1 wherein the polycarboxylic acid is selected from the group consisting of isophthalic acid, terephthalic acid, and mixtures thereof and the polyalkylene polyamine is selected from the group consisting of diethylene triamine, triethylene tetramine and mixtures thereof.
Claim 3
Dependent Claim
19 words
The improvement of claim 1 wherein the polycarboxylic acid is itaconic acid and the polyalkylene polyamine is diethylene triamine.
Claim 4
Dependent Claim
36 words
The improvement of claim 1 wherein the amount of resin incorporated is from about 0.2 percent to about 5 percent of the dry weight of the fibrous pulp and the heated surface is a Yankee drier.
Claim 5
Dependent Claim
28 words
The improvement of claim 3 wherein the amount of resin incorporated is from about 0.2 percent to about 5 percent of the dry weight of the fibrous pulp.
Claim 6
Dependent Claim
66 words
A paper-making slurry comprising a fibrous paper-making pulp and from about 0.2 percent to about 5 percent, based on the dry weight of the fibrous pulp, of a water-dispersible repulpable resin comprising a condensate of a polycarboxylic acid with between about 0.8 and 2.2 molar equivalents of a polyalkylene polyamine containing at least two primary amine groups and at least one secondary or tertiary amine groups.
Claim 7
Dependent Claim
56 words
A fibrous paper web comprising a fibrous pulp and between about 0.2 percent and 5 percent, on a dry weight basis, of a condensate of a polycarboxylic acid with between about 0.8 and 2.2 molar equivalents of a polyalkylene polyamine containing at least two primary amine groups and at least one secondary or tertiary amine groups.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the resin is neutralized with an acid.
References Cited (Backward Citations)
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |