Patent US4517326A successfully refreshed from Google Patents.
US4517326A
Expired / Lapsed
US
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Aqueous liquid filled polyurethane gels and method of making the same
Assignee: Cook Composites and Polymers Co
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Filing: 1983-04-22
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Granted: 1985-05-14
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Expires: 2003-04-22
Abstract
Abstract A liquid-filled polyurethane elastomer gel is fabricated from water, organic glycol and a polyisocyanate prepolymer. The prepolymer is formed from organic di-isocyanate and organic diol or triol having a molecular weight of 3,000 to 10,000 and containing at least 40 percent by weight ethylene oxide adducts. The prepolymer is mixed with 3 to 20 times its weight of aqueous reactant including 25 to 65 percent by weight water and 75 to 35 percent by weight organic polyol. The resulting stable gel contains aqueous solutions or emulsions dispersed therein as small droplets comprising 75 to 95 percent of the weight of the resulting article. The liquid-filled polyurethane elastomer gel can be cast into shapes or can be formed into globs of random shape.
Inventors
- 👤 Howard P. Cordts
- 👤 Joan E. Karloske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G2210/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31565
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
155 words
A method for producing a thermoset article having a polyurethane elastomer continuous phase and having dispersed liquid-phase droplets as a discontinuous phase, comprising: A. obtaining polyisocyanate prepolymer having an NCO--value of 2.5-3.0, formed from the reaction of organic di-isocyanate and organic polyether polyol, containing at least 40 percent by weight ethylene oxide adducts; B. mixing said polyisocyanate prepolymer under reactive conditions with an aqueous reactant including 25 to 65 percent by weight water and 75 to 35 percent by weight of organic polyol, the weight of said aqueous reactant being from 3 to 20 times the weight of said polyisocyanate prepolymer; C. after gelation of the mixture has commenced but before gelation has completed, forming the mixture into a desired shape until the mixture cures with discrete droplets of unreacted aqueous reactant homogeneously dispersed therethrough; and D. recovering a homogeneous shaped article containing from 75 to 95 percent by weight of the said aqueous reactant.
Claim 2
Independent Claim
155 words
A method for producing a thermoset article having a polyurethane elastomer continuous phase and having dispersed liquid-phase droplets as a discontinuous phase, comprising: A. obtaining polyisocyanate prepolymer having an NCO--value of 2.5-3.0, formed from the reaction of organic di-isocyanate and organic polyether polyol, containing at least 40 percent by weight ethylene oxide adducts; B. mixing said polyisocyanate prepolymer under reactive conditions with an aqueous reactant including 25 to 65 percent by weight water and 75 to 35 percent by weight of organic polyol, the weight of said aqueous reactant being from 3 to 20 times the weight of said polyisocyanate prepolymer; C. after gelation of the mixture has commenced but before gelation has completed, forming the mixture into a desired shape until the mixture cures with discrete droplets of unreacted aqueous reactant homogeneously dispersed therethrough; and D. recovering a homogeneous shaped article containing from 75 to 95 percent by weight of the said aqueous reactant.
Claim 3
Dependent Claim
36 words
The method according to claim 1 wherein the said organic polyol is a glycol, selected from the class consisting of ethylene glycol, propylene glycol, dipropylene glycol, bis(2-hydroxy-ethoxyethyl) glutarate and polypropylene oxide adducts of diols or triols.
Claim 4
Dependent Claim
41 words
The method according to claim 1 wherein the said organic polyol is a digestion product formed by digesting polyethylene terephthalate with a diol, such digestion product having a hydroxyl value of 180 to 250 and a molecular weight less than 15,000.
Claim 5
Dependent Claim
13 words
The method according to claim 3 wherein the said diol is bis(2-hydroxy-ethoxyethyl) glutarate.
Claim 6
Dependent Claim
36 words
The method of claim 1 wherein the said mixture is formed into a desired shape by being introduced into a mold cavity having the said desired shape and is retained within the mold cavity until cured.
Claim 7
Dependent Claim
14 words
The method of claim 5 wherein the said mold cavity has a spherical shape.
Claim 8
Dependent Claim
38 words
The method of claim 1 wherein the said organic di-isocyanate is selected from the class consisting of toluene di-isocyanate and isomeric mixtures thereof and isophorone di-isocyanate; and the said organic polyether polyol has a molecular weight of 3,000-10,000.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein the said organic polyether polyol contains at least 45 weight percent ethylene oxide adducts.
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein the said aqueous reactant contains dissolved volatile perfumes, fragrances or other solutes which can be detected by scent.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the said aqueous reactant contains dissolved volatile insecticides or bacteriacides.
Claim 12
Dependent Claim
20 words
The method of claim 1 wherein the said aqueous reactant contains dissolved electrolytes and the resulting article is electrically conductive.
Claim 13
Dependent Claim
13 words
The method of claim 1 wherein the said polyurethane elastomer contains a colorant.
Claim 14
Dependent Claim
13 words
The method of claim 1 wherein the said aqueous reactant contains a colorant.
Claim 15
Dependent Claim
63 words
An article having a desired shape and comprising a polyurethane elastomer as the continuous phase and comprising as the discontinuous phase, homogeneously dispersed discrete droplets of an aqueous liquid including 25 to 65 percent by weight water and 75 to 35 percent by weight of organic polyol, said discontinuous phase comprising from 75 to 95 percent of the weight of the said article.
Claim 16
Dependent Claim
63 words
An article having a desired shape and comprising a polyurethane elastomer as the continuous phase and comprising as the discontinuous phase, homogeneously dispersed discrete droplets of an aqueous liquid including 25 to 65 percent by weight water and 75 to 35 percent by weight of organic polyol, said discontinuous phase comprising from 75 to 95 percent of the weight of the said article.
Claim 17
Dependent Claim
36 words
The article of claim 14 having as the said organic polyol is selected from the class consisting of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, bis(2-hydroxy-ethoxyethyl) glutarate and polypropylene oxide adducts of diols or triols.
Claim 18
Dependent Claim
9 words
The article of claim 15 in a spherical shape.
Claim 19
Dependent Claim
39 words
The article of claim 16 wherein the said glycol is a digestion product formed by digesting polyethylene terephthalate with a diol, such digestion product having a hydroxyl value of 180 to 250 and a molecular weight less than 15,000.
Claim 20
Dependent Claim
14 words
The article of claim 14 shaped into a prosthetic device for the human body.
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |