US5176715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dyeing cellulosic fiber materials with vat dyes: dosing continuously over time interval
Assignee: BASF Corp
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Filing: 1991-08-07
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Granted: 1993-01-05
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Expires: 2011-08-07
Abstract
Abstract There is disclosed a process for dyeing cellulosic fibre materials with vat dyes, which comprises adding to the dyebath all or some of the auxiliary chemicals required for the dyeing process, and subsequently, after a pretratment time, adding the vat dye or its leuco form with the aid of a metering device to the dyebath, and dyeing the fiber materials by optionally increasing the temperature of the dyebath. Level dyeings are obtained with the novel process, the cellulosic material having a perfectly level appearance as well as good light- and wetfastness properties.
Inventors
- 👤 Peter J. Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:53
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/0004; D06P3/00; D06P3/58; D06P3/60; D06P3/6025; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A process for dyeing cellulosic fiber materials with a vat dye, which comprises adding to a dyeing bath all or some of the alkaline compounds or alkali donors and reducing agents, and further auxiliary chemicals, required for the dyeing process, pretreating the fiber material at temperatures of 20° to 100° C. in said dyeing bath, subsequently adding the vat dye or its leuco compound continuously over an interval of time to the dyeing bath at temperatures of 20° to 100° C., and thereafter dyeing the fiber material at temperatures of 20° to 110° C.
Claim 2
Dependent Claim
94 words
A process for dyeing cellulosic fiber materials with a vat dye, which comprises adding to a dyeing bath all or some of the alkaline compounds or alkali donors and reducing agents, and further auxiliary chemicals, required for the dyeing process, pretreating the fiber material at temperatures of 20° to 100° C. in said dyeing bath, subsequently adding the vat dye or its leuco compound continuously over an interval of time to the dyeing bath at temperatures of 20° to 100° C., and thereafter dyeing the fiber material at temperatures of 20° to 110° C.
Claim 3
Dependent Claim
27 words
A process according to claim 1, wherein the dyeing is carried out in the dyeing bath which is heated to a temperature of 20° to 110° C.
Claim 4
Dependent Claim
23 words
A process according to claim 1, wherein the vat dye or its leuco compound are added at a constant, decreasing or increasing rate.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the vat dye or its leuco compound have been coarsely milled.
Claim 6
Dependent Claim
18 words
A process according to claim 1, wherein the cellulosic fibre material is yarn of cotton or regenerated cellulose.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the cellulosic fiber material is compressed or non-compressed cheese.
Claim 8
Dependent Claim
16 words
A process according to claim 1, wherein the pretreatment time is from 5 to 20 minutes.
Claim 9
Dependent Claim
26 words
A process according to claim 1, wherein the interval of time for adding the vat dye or its leuco compound is from 15 to 40 minutes.
Claim 10
Dependent Claim
11 words
The fibre material dyed by a process according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-05 | 1996-07-06 | 1997-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-05 | 2000-07-06 | 2001-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-05 | 2004-07-06 | 2005-01-05 | $7700.00 | Window Closed / Lapsed |