US3821136A
Expired / Lapsed
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Water absorbtive polyurethane polymers
Assignee: Princeton Polymer Laboratories Inc
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Filing: 1972-06-23
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Granted: 1974-06-28
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Expires: 1992-06-23
Abstract
Abstract Water absorbtive polyurethane polymers of resins of low equivalent weight and high molecular weight and slightly in excess of equimolar ratios of polyisocyanates or urethane linkage precursors, useful in applications where hydrophilicity or water absorbtion is needed such as for anti-fog coatings; membranes (dialysis or osmosis); swellable fabrics; castable, waterabsorbent shapes; castable, machinable and polishable shapes having use as body implants and having water absorbtive properties; etc.
Inventors
- 👤 D Hudgin
- 👤 E Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6415; C08G18/6423; B; B01; B01D; B01D71/00; B01D71/06; B01D71/54; C08G18/48; C08G18/70; C08G18/72; C08G18/80; C08G2210/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S524/00; Y10S524/916
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
75 words
A polyurethane polymer comprising: A. as a resin precursor of said polyurethane polymer at least one polyfunctional resin having an equivalent weight of 170 and less, a molecular weight of at least 500 wherein the polyfunctional resin is the reaction product of at least one member selected from the group consisting of propylene oxide, ethylene oxide, dioxolane, ethylene imine or propylene imine with a hydroxy group containing compound, said resin precursor having the general formula
Claim 2
Dependent Claim
132 words
A polyurethane polymer comprising: A. as a resin precursor of said polymer at least one polyfunctional resin having an equivalent weight of 140 and less, a molecular weight of at least 340 and a carbon to oxygen or amine ratio of 2.4:1 to 1.2:1 and wherein the polyfunctional resin is the reaction product of at least one member selected from the group consisting of propylene oxide, ethylene oxide, dioxolane, ethylene imine or propylene imine with a hydroxy group containing compound having 6 and more -OH groups per molecule, and B. as a urethane linkage precursor of said polymer at least one aliphatic, aliphatic-alicyclic, mixed aliphatic-aromatic, or an aromatic polyfunctional isocyanate in an amount from 0.02% to about 15% excess above the equimolar ratio in reference to the equimolar amount of said resin.
Claim 3
Dependent Claim
148 words
A polyurethane polymer comprising: A. as a resin precursor of said polymer at least one polyfunctional resin having a equivalent weight of 140 and less, a molecular weight of at least 840 and a carbon to oxygen or amine ratio of 2.8:1 to 1.2:1 and wherein the polyfunctional resin is the reaction product of at least one member selected from the group consisting of propylene oxide, ethylene oxide, dioxolane, ethylene imine or propylene imine with a hydroxy group containing compound having 6 and more -OH groups per molecule; B. as a urethane linkage precursor of said polymer at least one aliphatic, aliphatic-alicyclic, mixed aliphatic-aromatic, or an aromatic polyfunctional isocyanate in an amount from 0.02% to about 15% excess above the equimolar ratio in reference to the equimolar amount of said resin; C. as additional urethane linkage precursor of said polymer a prepolymer of polyethylene oxide and said isocyanate.
Claim 4
Dependent Claim
50 words
The polyurethane polymer as defined in claim 1 and wherein the equivalent weight of the resin is 140 and less and the molecular weight is 1,030 and more, and wherein the urethane linkage precursor is selected from the group consisting of trimethyl hexamethylene diisocyanate, methylene di(cyclohexyl isocyanate), and adiponitrile carbonate.
Claim 5
Dependent Claim
29 words
The polyurethane polymer as defined in claim 1 and wherein the resin is a propoxylated, ethoxylated or mixtures of same of sorbitol, manitol, sucrose, maltose, lactose, cellobiose, or raffinose.
Claim 6
Dependent Claim
37 words
The polymer as defined in claim 1 and wherein the hydroxy compound precursor of said resin, defined by R-(OH)x, is sorbitol, manitol, sucrose, maltose, lactose, cellobiose, polyvinyl alcohol of up to 50 repeating units and methoxy cellulose.
Claim 7
Dependent Claim
48 words
The polymer as defined in claim 1 and wherein the isocyanate is selected from the group consisting of tetramethylene diisocyanate; hexamethylene diisocyanate; trimethylhexamethylene diisocyanate; dimer acid diisocyanate; isophorone diisocyanate; hydrogenated diphenyl methane diisocyanate; methylene di(cyclohexyl isocyanate); metaxylylene diisocyanate; diethyl benzene diisocyanate; decamethylene 1,10-diisocyanate; cyclohexylene 1,2-diisocyanate and cyclohexylene 1,4-diisocyanate.
Claim 8
Dependent Claim
35 words
The polymer as defined in claim 1 and wherein the isocyanate is selected from the group consisting of 2,4-and 2,6-tolylene diisocyanate; 4,4''-diphenyl methane diisocyanate; dianisidine diiSocyanate; tolidine diisocyanate; xenylene diisocyanate; 1,5-naphthalene diisocyanate; and tetrahydro naphthalene-1,5-diisocyanate.
Claim 9
Dependent Claim
16 words
The polymer as defined in claim 1 and wherein the urethane linkage precursor is adiponitrile carbonate.
Claim 10
Dependent Claim
24 words
The polymer as defined in claim 1 and wherein the hydroxy compound is a propoxylated sucrose of 140 equivalent weight and 1,030 molecular weight.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |