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US4443222A
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Zinc pyrithione process to impart antimicrobial properties to textiles
Assignee: United States Department of Agriculture
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Filing: 1983-08-30
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Granted: 1984-04-17
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Expires: 2003-08-30
Abstract
Abstract A process by which 1-hydroxy-2-pyridinethione (pyrithione) can be deposited in cellulosic textiles in a water-insoluble form is disclosed. A polyamine is used to keep a zinc complex of pyrithione in aqueous solution prior to and during its application to textiles; when the solution also contains urea, heating fabric impregnated with the solution converts the pyrithione complex to an insoluble material. Fabric treated by the process has high bacteriostatic and fungistatic activity, and retains antimicrobial properties after repeated laundering.
Inventors
- 👤 Cletus E. Morris
- 👤 Clark M. Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:42
CPC Classifications
D; D06; D06M; D06M16/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A process for imparting to cellulosic textiles antimicrobial properties that are durable to laundering comprising: (a) impregnating the cellulosic textile material with a solution of zinc pyrithione, sufficient amounts of polyamine capable of solubilizing the pyrithione complex per part of zinc pyrithione, and sufficient amounts of urea to provide one urea molecule for each primary and secondary amino group in the polyamine; (b) heating the textile at sufficient temperature to drive off the moisture and complete the reaction.
Claim 2
Dependent Claim
78 words
A process for imparting to cellulosic textiles antimicrobial properties that are durable to laundering comprising: (a) impregnating the cellulosic textile material with a solution of zinc pyrithione, sufficient amounts of polyamine capable of solubilizing the pyrithione complex per part of zinc pyrithione, and sufficient amounts of urea to provide one urea molecule for each primary and secondary amino group in the polyamine; (b) heating the textile at sufficient temperature to drive off the moisture and complete the reaction.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the solution contains at least 1.5 parts of polyamine.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the heating step is at a temperature above 100° C.
Claim 5
Dependent Claim
36 words
The process of claim 3 wherein the polyamine is a polyethylenimine with an average molecular weight of about from 600 to 1200 and the solution contains at least 1.4 parts of urea per part of polyethylenimine.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the cellulosic material is cotton.
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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |