US5114984A
Expired / Lapsed
US
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Process for producing an antimicrobially effective polyurethane
Assignee: Olin Corp
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Filing: 1991-04-26
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Granted: 1992-05-19
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Expires: 2011-04-26
Abstract
Abstract The present invention relates to a process for imparting anti-bacterial and anti-fungal properties to a polyurethane foam. Dissolving the pyrithione salt in an alkanolamine which is miscible with a polyol, makes this dissolved pyrithione an ideal candidate for use as a antimicrobial additive in this application. Prior use of pyrithiones in polyurethanes entailed using the powder form of zinc pyrithione. This was a dusty process as well as being difficult to disperse the pyrithione uniformly throughout the polyurethane foam. This invention overcomes both of these difficulties.
Inventors
- 👤 Charles E. Branch
- 👤 David F. Gavin
- 👤 Thomas E. Robitaille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:04
CPC Classifications
A; A01; A01N; A01N43/00; A01N43/34; A01N43/40; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/378; C08G2110/00; C08G2110/0008; C08G2110/0083
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
72 words
A process for producing an antimicrobially effective polyurethane which comprises the steps of: (a) dissolving a pyrithione salt(s) in an alkanolamine to provide a dissolved pyrithione salt, (b) contacting said dissolved pyrithione salt with a polyol to provide a liquid mixture containing said polyol plus said dissolved pyrithione salt, and (c) reacting said liquid mixture with a polyisocyanate in order to produce a polyurethane characterized by uniform biocidal effectiveness throughout the polyurethane.
Claim 2
Dependent Claim
72 words
A process for producing an antimicrobially effective polyurethane which comprises the steps of: (a) dissolving a pyrithione salt(s) in an alkanolamine to provide a dissolved pyrithione salt, (b) contacting said dissolved pyrithione salt with a polyol to provide a liquid mixture containing said polyol plus said dissolved pyrithione salt, and (c) reacting said liquid mixture with a polyisocyanate in order to produce a polyurethane characterized by uniform biocidal effectiveness throughout the polyurethane.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein steps (a) and (b) are carried out simultaneously.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein steps (a), (b) and (c) are carried out simultaneously.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein said pyrithione salt is selected from the group consisting of the zinc, magnesium, copper, and zirconium salts of pyrithione, and combinations thereof.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein said alkanolamine is selected from the group consisting of monoisopropanolamine, monoethanolamine, and combinations
Claim 7
Dependent Claim
29 words
A polyurethane forming composition comprising: (a) a polyol, (b) a polyisocyanate, (c) a biocidally effective amount of a solution consisting essentially of a pyrithione salt dissolved in an alkanolamine.
Claim 8
Dependent Claim
29 words
A polyurethane forming composition comprising: (a) a polyol, (b) a polyisocyanate, (c) a biocidally effective amount of a solution consisting essentially of a pyrithione salt dissolved in an alkanolamine.
Claim 9
Dependent Claim
28 words
The composition of claim 6 wherein said pyrithione salt is selected from the group consisting of the zinc, magnesium, copper, and zirconium salts of pyrithione, and combinations thereof.
Claim 10
Dependent Claim
20 words
The composition of claim 6 wherein said alkanolamine is selected from the group consisting of monoisopropanolamine, monoethanolamine, and combinations thereof.
Claim 11
Dependent Claim
32 words
The composition of claim 6 wherein said pyrithione salt is present in an amount of between about 200 and about 2000 ppm of pyrithione salt based upon the weight of the composition.
Claim 12
Dependent Claim
26 words
A polyol composition comprising: (a) a polyol, and (b) a biocidally effective amount of a solution consisting essentially of a pyrithione salt dissolved in an alkanolamine.
Claim 13
Dependent Claim
26 words
A polyol composition comprising: (a) a polyol, and (b) a biocidally effective amount of a solution consisting essentially of a pyrithione salt dissolved in an alkanolamine.
Claim 14
Dependent Claim
28 words
The composition of claim 10 wherein said pyrithione salt is selected from the group consisting of the zinc, magnesium, copper, and zirconium salts of pyrithione, and combinations thereof.
Claim 15
Dependent Claim
21 words
The composition of claim 10 wherein said alkanol amine is selected from the group consisting of monoisopropanolamine, monoethanolamine, and combinations thereof.
Claim 16
Dependent Claim
21 words
The composition of claim 10 wherein the molar ratio of alkanolamine to pyrithione salt is between about 0.5 and about 5.
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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) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |