US4113674A
Expired / Lapsed
US
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Poly-2-alkyl-2-oxazoline modified regenerated cellulosics
Assignee: Dow Chemical Co
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Filing: 1976-12-27
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Granted: 1978-09-12
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Expires: 1996-12-27
Abstract
Abstract Modified, regenerated cellulosics having good receptivity to acid dyes are prepared by introducing a poly-2-alkyl-2-oxazoline, such as poly-2-ethyl-2-oxazoline, having a weight average molecular weight of at least about 10,000 into an aged, cellulose-xanthate solution and forming modified, regenerated cellulosics therefrom. These cellulosics exhibit rapid and quantitative acid-dye absorption and good dye fastness.
Inventors
- 👤 Stephen L. Miller
- 👤 Yancey J. Dickert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:46
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/22; C08L1/24; D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/6008; Y; Y10; Y10S; Y10S8/00; Y10S8/92
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
36 words
A modified, regenerated cellulosic comprising regenerated cellulose and at least one weight percent of a poly-2-alkyl-2-oxazoline having a weight average molecular weight of at least about 10,000, the poly-2-alkyl-2-oxazoline being an integral part of the cellulosic.
Claim 2
Dependent Claim
36 words
A modified, regenerated cellulosic comprising regenerated cellulose and at least one weight percent of a poly-2-alkyl-2-oxazoline having a weight average molecular weight of at least about 10,000, the poly-2-alkyl-2-oxazoline being an integral part of the cellulosic.
Claim 3
Dependent Claim
51 words
The cellulosic of claim 1 wherein the poly-2-alkyl-2-oxazoline has a backbone molecular structure comprising repeating units of the formula ##STR3## wherein R is an alkyl or an inertly-substituted alkyl radical of 1-6 carbon atoms and each R" is hydrogen or an alkyl or an inertly-substituted alkyl radical of 1-4 carbon atoms.
Claim 4
Dependent Claim
10 words
The cellulosic of claim 2 wherein each R" is hydrogen.
Claim 5
Dependent Claim
9 words
The cellulosic of claim 3 wherein R is ethyl.
Claim 6
Dependent Claim
22 words
The cellulosic of claim 4 wherein the poly-2-ethyl-2-oxazoline has a weight average molecular weight of between about 50,000 and about 350,000, inclusive.
Claim 7
Dependent Claim
16 words
The cellulosic of claim 5 comprised of at least about 2.5 weight percent of the poly-2-ethyl-2-oxazoline.
Claim 8
Dependent Claim
49 words
A method of preparing the modified, regenerated cellulosic of claim 1, the method comprising: (a) mixing an aqueous solution of a poly-2-alkyl-2-oxazoline having a weight average molecular weight of at least about 10,000 into an aged, cellulose-xanthate solution prior to cellulosic formation, and (b) forming modified, regenerated cellulosics therefrom.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein the poly-2-alkyl-2-oxazoline has a weight average molecular weight of between about 50,000 and about 350,000, inclusive.
Claim 10
Dependent Claim
51 words
The method of claim 8 wherein the poly-2-alkyl-2-oxazoline has a backbone molecular structure comprising repeating units having the formula ##STR4## wherein R is an alkyl or an inertly-substituted alkyl radical of 1-6 carbon atoms and each R" is hydrogen or an alkyl or an inertly-substituted alkyl radical of 1-4 carbon atoms.
Claim 11
Dependent Claim
10 words
The method of claim 9 wherein each R" is hydrogen.
Claim 12
Dependent Claim
9 words
The method of claim 10 wherein R is ethyl.
Claim 13
Dependent Claim
17 words
The method of claim 11 wherein the aqueous solution contains at least about 10 weight percent poly-2-ethyl-2-oxazoline.
Claim 14
Dependent Claim
17 words
The method of claim 11 wherein the aqueous solution contains at least about 20 weight percent poly-2-ethyl-2-oxazoline.
Claim 15
Dependent Claim
33 words
The method of claim 13 wherein sufficient poly-2-ethyl-2-oxazoline is introduced into the aged, cellulose-xanthate solution such that the resulting solution contains at least about one weight percent poly-2-ethyl-2-oxazoline based on cellulose in viscose.
Claim 16
Dependent Claim
33 words
The method of claim 13 wherein sufficient poly-2-ethyl-2-oxazoline is introduced into the aged, cellulose-xanthate solution such that the resulting solution contains at least about 2.5 weight percent poly-2-ethyl-2-oxazoline based on cellulose in viscose.
Claim 17
Dependent Claim
26 words
The method of claim 15 wherein the aqueous poly-2-ethyl-2-oxazoline solution and the aged, cellulose-xanthate solution are blended such that the resulting solution is a homogeneous mixture.
Claim 18
Dependent Claim
49 words
A modified, regenerated cellulosic prepared by a method comprising: (a) mixing an aqueous solution of at least about 10 weight percent poly-2-alkyl-2-oxazoline having a weight average molecular weight of at least about 10,000 into an aged, cellulose-xanthate solution prior to cellulosic formation, and (b) forming modified, regenerated cellulosics therefrom.
Claim 19
Dependent Claim
49 words
A modified, regenerated cellulosic prepared by a method comprising: (a) mixing an aqueous solution of at least about 10 weight percent poly-2-alkyl-2-oxazoline having a weight average molecular weight of at least about 10,000 into an aged, cellulose-xanthate solution prior to cellulosic formation, and (b) forming modified, regenerated cellulosics therefrom.
References Cited (Backward Citations)
US3305377A
Cited
US3377412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |