Patent US3622528A successfully refreshed from Google Patents.
US3622528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylenimine fatty acid epichlorohydrin product
Assignee: Dow Chemical Co
•
Filing: 1968-06-13
•
Granted: 1971-11-23
•
Expires: 1988-06-13
Abstract
Abstract An improved polyethylenimine adduct for cellulosic products is prepared by condensing polyethylenimine with 0.05-0.4 mole of a C12-C22 fatty acid and thereafter capping the residual free amino groups by reaction in aqueous solution at 0*-50* C. with epichlorohydrin. The resulting product is an effective softener, sizing agent, and wet-strength additive for paper and other cellulosic products with superior color stability and increased resistance to yellowing.
Inventors
- 👤 Juan Longoria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:13
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/10; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022; D; D06; D06M; D06M13/00; D06M13/322; D06M13/385; D06M13/402; D06M13/405; D06M15/00; D06M15/19; D06M15/37; D06M15/61; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
16 words
The process of claim 1 where the polyethylenimine has an average molecular weight of about 500-5,000.
Claim 2
Dependent Claim
12 words
The process of claim 1 where the fatty acid is lauric acid.
Claim 3
Dependent Claim
12 words
The process of claim 1 where the fatty acid is stearic acid.
Claim 4
Dependent Claim
18 words
The process of claim 1 where the ratio of fatty acid is about 0.1-0.3 mole per polyethylenimine nitrogen.
Claim 5
Dependent Claim
22 words
The process of claim 1 where the free amino groups are capped by reaction with 0.85-1.2 mole epichlorohydrin per free amino group.
Claim 6
Dependent Claim
14 words
A polyethylenimine fatty acid epichlorohydrin condensation product prepared by the process of claim 2.
Claim 7
Dependent Claim
12 words
The process of claim 1 where the fatty acid is oleic acid.
Claim 8
Dependent Claim
12 words
The process of claim 1 where the fatty acid is tall oil.
References Cited (Backward Citations)
US2601597A
Cited
US2882185A
Cited
US2969302A
Cited
US2926154A
Cited
NL6612293A
Cited
GB1156516A
Cited
US3313736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |