Patent US4937273A successfully refreshed from Google Patents.
US4937273A
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Process for producing antibacterial flexible polyurethane foam
Assignee: Bridgestone Corp
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Filing: 1988-12-15
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Granted: 1990-06-26
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Expires: 2008-12-15
Abstract
Abstract The present invention provides a process for producing an antibacterial flexible polyurethane foam containing an antibacterial agent dispersed therein from a foaming mixture composed of polyols, organic isocyanates, catalysts, and blowing agents. The process is characterized in that the antibacterial agent is added to the foaming mixture and the catalyst is an organic amine which is used alone or in combination with a tin compound. In the latter case, the tin compound is a tetravalent tin compound or a divalent tin compound which is used in an amount less than 1 part by weight for 1 part by weight of the antibacterial agent. The antibacterial flexible polyurethane foam retains the antibacterial action for a long time and is safe because it contains an inorganic antibacterial agent dispersed therein which does not yield resistant bacteria.
Inventors
- 👤 Toru Okuyama
- 👤 Yasuo Kamimura
- 👤 Kuniaki Yasunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:52
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/10; C08K3/105; C08K3/01; C08K3/015
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
90 words
A process for producing an antibacterial flexible polyurethane foam containing an antibacterial agent dispersed therein, which comprises: mixing polyol, organic isocyanate, catalyst, blowing agent, and a metal ion antibacterial agent supported on zeolite, said catalyst being an organic amine which is used alone or in combination with a tetravalent tin compound or with a divalent tin compound in an amount less than 1 part by weight for 1 part by weight of the metal ion antibacterial agent supported on zeolite, and foaming said mixture to obtain a flexible polyurethane foam.
Claim 2
Dependent Claim
90 words
A process for producing an antibacterial flexible polyurethane foam containing an antibacterial agent dispersed therein, which comprises: mixing polyol, organic isocyanate, catalyst, blowing agent, and a metal ion antibacterial agent supported on zeolite, said catalyst being an organic amine which is used alone or in combination with a tetravalent tin compound or with a divalent tin compound in an amount less than 1 part by weight for 1 part by weight of the metal ion antibacterial agent supported on zeolite, and foaming said mixture to obtain a flexible polyurethane foam.
Claim 3
Dependent Claim
18 words
The process according to claim 1, wherein the metal ion antibacterial agent is in the form of powder.
Claim 4
Dependent Claim
21 words
The process according to claim 2, wherein the metal ion antibacterial agent is a silver, copper, or zinc ion antibacterial agent.
Claim 5
Dependent Claim
15 words
The process according to claim 1, wherein the polyol is polyether polyol or polyester polyol.
Claim 6
Dependent Claim
34 words
The process according to claim 4, wherein the polyether polyols comprise adducts of polyhydric alcohols with alkylene oxide, adducts of amines with alkylene oxide, or a graft-type polymer polyol derived from styrene of acrylonitrile.
Claim 7
Dependent Claim
16 words
The process according to claim 4, wherein the polyester polyol includes hydroxyl-terminated polyester polyol or polycaprolactone.
Claim 8
Dependent Claim
17 words
The process according to claim 1, wherein the molecular weight of the polyol is 600 to 6000.
Claim 9
Dependent Claim
19 words
The process according to claim 1, wherein the organic isocyanate contains two or more isocyanate groups in one molecule.
Claim 10
Dependent Claim
23 words
The process according to claim 8, wherein the organic isocyanate comprises aliphatic isocyanates, aromatic isocyanates, polyisocyanate monomer, mixtures thereof, or modified products thereof.
Claim 11
Dependent Claim
24 words
The process according to claim 9, wherein the aliphatic isocyanates are selected from the group consisting of hexamethylene diisocyanate, isophorone diisocyanate, and methylcyclohexane diisocyanate.
Claim 12
Dependent Claim
31 words
The process according to claim 9, wherein the aromatic isocyanates are selected from the group consisting of tolylene diisocyanate, 2,4-isomers, 2,6-isomers, mixtures of 2,4-isomers and 2,6-isomers, diphenylmethane diisocyanate, and bitolylene diisocyanate.
Claim 13
Dependent Claim
30 words
The process according to claim 1, wherein the organic isocyanate is used in an amount of 15 to 70 parts by weight for 100 parts by weight of the polyol.
Claim 14
Dependent Claim
12 words
The process according to claim 1, wherein the blowing agent is water.
Claim 15
Dependent Claim
19 words
The process according to claim 13, wherein the blowing agent further comprises a low-boiling organic solvent or a gas.
Claim 16
Dependent Claim
29 words
The process according to claim 1, wherein the organic amine is used in an amount of 0.1 to 10 parts by weight for 100 parts by weight of polyol.
Claim 17
Dependent Claim
30 words
The process according to claim 1, wherein the tetravalent tin compound is used in an amount of 0.1 to 2 parts by weight for 100 parts by weight of polyol.
Claim 18
Dependent Claim
31 words
The process according to claim 1, wherein the divalent tin compound is used in an amount less than 1 part by weight for 1 part by weight of the antibacterial agent.
Claim 19
Dependent Claim
42 words
The process according to claim 1, wherein the organic amine is selected from the group consisting of triethylene-diamine, N-methylmorpholine, N-ethyl-morpholine, tetramethyl-1,4-butanediamine, dimethylethanol-amine, diethylethanolamine, triethylamine, dimethylbenzylamine, triethanol-amine, 1,8-diazacyclo (5.4.0)undecene-7, bis(2-dimethylaminoethyl)ether, trimethylaminoethyl piperagine, methylhydroxyethyl piperazin, N,N,N',N'-tetramethylhexamethyllenediamine, N,N,N',N'-tetramethylpropylenediamine, N,N,N, 'N',N"-pentamethyldiethylenetriamine, N,-trioxyethylene-N, N-dimethylamine, and N,N,N'-trimethylaminoethyl ethanolamine.
Claim 20
Dependent Claim
17 words
The process according to claim 1, wherein the tetravalent tin compound is dibutyltin dilaurate or dibutyltin diacetate.
Claim 21
Dependent Claim
17 words
The process according to claim 1, wherein the divalent tin compound is stannous octoate or stannous oleate.
Claim 22
Dependent Claim
42 words
The process according to claim 3, wherein the silver content is 0.0006 to 4% by weight, the copper content is 0.03 to 10% by weight or the zinc content is 0.04 to 14% by weight of the total weight of the agent.
Claim 23
Dependent Claim
28 words
The process according to claim 1, wherein the metal ion antibacterial agent is used in the form of powder having an average particle of 0.1 to 1 μm.
Claim 24
Dependent Claim
29 words
The process according to claim 1, wherein the metal ion antibacterial agent is present in an amount of 0.1 parts by weight for 100 parts by weight of polyol.
References Cited (Backward Citations)
US3931062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |