US4614762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble linear polyethyleneimine derivative from water-insoluble polyethyleneimine, polyvinyl alcohol and aldehyde
Assignee: WR Grace and Co Conn
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Filing: 1984-06-15
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Granted: 1986-09-30
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Expires: 2004-06-15
Abstract
Abstract The present invention is directed to a high molecular weight, water soluble polymer product of polyethyleneimine, said product is formed by reacting a linear polyethylenimine with formaldehyde and a polyvinyl alcohol. The resultant product is useful as an improved drainage and retention aid in papermaking processes.
Inventors
- 👤 Nelson S. Marans
- 👤 Stephen M. Pulford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/56; C; C08; C08G; C08G12/00; C08G12/46; C08G73/00; C08G73/02; C08G73/0233
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A water soluble polymer product formed by reacting the reactants consisting essentially of a linear, substantial water insoluble polyethyleneimine having at least about 90 percent of the amino groups therein in the form of free secondary amino groups, a polyvinyl alcohol and a C 1 -C 2 aldehyde to form a single polymer product of said three reactants, said molar ratio of linear polyethyleneimine to polyvinyl alcohol to aldehyde being reacted is from about 1:0.1:0.1 to 1:10:10.
Claim 2
Dependent Claim
77 words
A water soluble polymer product formed by reacting the reactants consisting essentially of a linear, substantial water insoluble polyethyleneimine having at least about 90 percent of the amino groups therein in the form of free secondary amino groups, a polyvinyl alcohol and a C 1 -C 2 aldehyde to form a single polymer product of said three reactants, said molar ratio of linear polyethyleneimine to polyvinyl alcohol to aldehyde being reacted is from about 1:0.1:0.1 to 1:10:10.
Claim 3
Dependent Claim
33 words
The product of claim 1 wherein the polyvinyl alcohol is at least 75 mole percent hydrolyzed polymer having a weight average molecular weight of from 1,500 to 150,000 and the aldehyde is formaldehyde.
Claim 4
Dependent Claim
46 words
The product of claim 1 wherein the linear polyethyleneimine has a weight average molecular weight of from about 2,500 to 100,000, the polyvinyl alcohol is at least 90 percent hydrolyzed having a weight average molecular weight of from 1,500 to 50,000 and the aldehyde is formaldehyde.
Claim 5
Dependent Claim
22 words
The product of claim 1 wherein the molar ratio of linear polyethyleneimine to polyvinyl alcohol to aldehyde is from 1:0.2:0.2 to 1:3:3.
Claim 6
Dependent Claim
22 words
The product of claim 3 wherein the molar ratio of linear polyethyleneimine to polyvinyl alcohol to aldehyde is from 1:0.2:0.2 to 1:3:3.
References Cited (Backward Citations)
US3348997A
Cited
US3597313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |