US3642571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A method of sizing cellulosic fibers using an n,n,-(x-alkyl)-n-carbamate{13 (n{11 {40 ,n{11 {40 -alkylen)urea
Assignee: Sun Chemical Corp
•
Filing: 1969-12-08
•
Granted: 1972-02-15
•
Expires: 1989-12-08
Abstract
Abstract Aqueous sizing compositions are prepared by combining an alkylN-substituted carbamate containing an isocyanate group with an alpha, beta-alkylenimine to form an N,N1-(X-alkyl)-N-carbamate, (N1'',N1''-alkylen)urea of a divalent organic radical having the formula:
Inventors
- 👤 Gerhard Ewald Sprenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:54
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/487; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
The process of claim 1 wherein the sizing compound is the product of the reaction of an alkyl-N-substituted carbamate containing an isocyanate group and an alpha, beta-alkylenimine.
Claim 2
Dependent Claim
31 words
The process of claim 1 wherein the sizing dispersion also contains a retention aid in an amount ranging from about 10 to 100 percent by weight, based on the sizing compound.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |