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US3607622A
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Aminopolyamide-acrylamide-polyaldehyde resins having utility as wet and dry strength agents, retention aids and flocculants and a process of making and using them and paper made therefrom
Assignee: Hercules LLC
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Filing: 1968-07-24
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Granted: 1971-09-21
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Expires: 1988-07-24
Abstract
Abstract Disclosed is a novel aminopolyamide-acrylamide-polyaldehyde resin useful in the paper making art to enhance the wet and dry strength of paper. Small amounts of the resin can also be used as a retention aid for mineral fillers in paper and as a flocculant for suspended matter.
Inventors
- 👤 Herbert H Espy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:49
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55; C; C08; C08G; C08G69/00; C08G69/48
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
21 words
The product of claim 1 wherein the aminopolyamide is the reaction product of the condensation reaction of tetraethylenepentamine with adipic acid.
Claim 2
Dependent Claim
21 words
The product of claim 1 wherein the aminopolyamide is the reaction product of the condensation reaction of tetraethylenepentamine with itaconic acid.
Claim 3
Dependent Claim
21 words
The product of claim 1 wherein the aminopolyamide is the reaction product of the condensation reaction of tetraethylenepentamine with isophthalic acid.
Claim 4
Dependent Claim
18 words
The product of claim 1 wherein the organic compound containing at least two free aldehyde groups is glyoxal.
Claim 5
Dependent Claim
18 words
The product of claim 1 wherein the organic compound containing at least two free aldehyde groups is glutaraldehyde.
Claim 6
Dependent Claim
14 words
The product of claim 1 wherein the acrylamide is a lower alkyl substituted acrylamide.
Claim 7
Dependent Claim
12 words
The process of preparing an aminopolyamide-acrylamide-polyaldehyde resin which comprises the steps of
Claim 8
Dependent Claim
34 words
The process of claim 8 wherein up to 50 percent of the amine groups in the aminopolyamide have been treated with an alkylating agent selected from the group consisting of alkyl sulfates and epihalohydrins.
Claim 9
Dependent Claim
13 words
The process of claim 8 wherein the polyalkylene polyamine is a polyethylene polyamine.
Claim 10
Dependent Claim
11 words
The process of claim 10 wherein the polyethylene polyamine is tetraethylenepentamine.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the polybasic carboxylic acid is a dicarboxylic acid.
Claim 12
Dependent Claim
12 words
The process of claim 12 wherein the dicarboxylic acid is adipic acid.
Claim 13
Dependent Claim
11 words
The process of claim 8 wherein the unsaturated amide is acrylamide.
Claim 14
Dependent Claim
18 words
The process of claim 8 wherein the organic compound containing at least two free aldehyde groups is glyoxal.
Claim 15
Dependent Claim
32 words
A paper treating composition comprising an aqueous solution of up to 15 percent solids by weight based on the weight of the water of the aminopolyamide- acrylamide- polyaldehyde resin of claim 1.
Claim 16
Dependent Claim
33 words
Paper treated with from about 0.05 percent to about 5 percent by weight based on the weight of the paper of the aminopolyamide- acrylamide- polyaldehyde resin of claim 1 to impart wet strength.
Claim 17
Dependent Claim
48 words
The process of treating paper to impart wet strength which comprises treating said paper with from about 0.05 percent to about 5 percent by weight based on the weight of the paper of the aminopolyamide- acrylamide- polyaldehyde resin of claim 1 and allowing the treated paper to dry.
Claim 18
Dependent Claim
16 words
The process of claim 18 wherein said treating is conducted during the formation of said paper.
Claim 19
Dependent Claim
30 words
The process of flocculating solid particles suspended in water which comprises adding an amount of the aminopolyamide-acrylamide- polyaldehyde resin of claim 1 to said suspension sufficient to flocculate said particles.
Claim 20
Dependent Claim
30 words
Paper treated with less than about 0.05 percent by weight based on the weight of the paper of the aminopolyamide-acrylamide-polyaldehyde resin of claim 1 to aid retention of mineral fillers.
Claim 21
Dependent Claim
46 words
The process of treating paper to aid the retention of mineral fillers which comprises treating said paper with less than about 0.05 percent by weight based on the weight of the paper of the aminopolyamide-acrylamide-polyaldehyde resin of claim 1 and allowing the treated paper to dry.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |