US3985688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly (urethane-urea) foam sealants for underground application and fluid precursors
Assignee: 3M Co
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Filing: 1974-01-28
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Granted: 1976-10-12
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Expires: 1994-01-28
Abstract
Abstract A water-bearing structure, such as a sewer, water line or aqueduct, is sealed to prevent or minimize the leakage of water into or from said structure by placing at the locus of said leakage a fluid sealing composition comprising a water-miscible mixture of isocyanate-terminated polyoxyethylene urethane prepolymers in a compatible, water-miscible solvent, and curing said prepolymer by reaction thereof with water to form a seal at said locus.
Inventors
- 👤 Steven R. Speech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:38
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/1645; F16L55/16455; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G2190/00; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
A water-miscible fluid composition comprising a water-miscible mixture, having an average molecular weight of about 1000-1300, in a compatible water-miscible solvent of a water-miscible isocyanate-terminated polyoxyalkylene urethane prepolymer component having a molecular weight of 1250 to 1550 and a water-miscible isocyanate-terminated polyoxyalkylene urethane prepolymer component having a molecular weight of 850 to 1000, said prepolymer components having a plurality of oxyethylene units sufficient to render the same water-miscible and being reactable with water to form a foamed poly(urethane-urea).
Claim 2
Dependent Claim
78 words
A water-miscible fluid composition comprising a water-miscible mixture, having an average molecular weight of about 1000-1300, in a compatible water-miscible solvent of a water-miscible isocyanate-terminated polyoxyalkylene urethane prepolymer component having a molecular weight of 1250 to 1550 and a water-miscible isocyanate-terminated polyoxyalkylene urethane prepolymer component having a molecular weight of 850 to 1000, said prepolymer components having a plurality of oxyethylene units sufficient to render the same water-miscible and being reactable with water to form a foamed poly(urethane-urea).
Claim 3
Dependent Claim
12 words
The composition according to claim 1 further comprising a foam stabilizing agent.
Claim 4
Dependent Claim
74 words
A water-miscible fluid composition comprising a water-miscible mixture, having an average molecular weight of about 1050-1250, in a compatible water-miscible solvent of a water-miscible isocyanate-terminated polyoxyethylene urethane prepolymer having a molecular weight of about 1350 and a water-miscible isocyanate-terminated polyoxyethylene urethane prepolymer having a molecular weight of about 950, said prepolymer components having a plurality of oxyethylene units sufficient to render the same water-miscible and being reactable with water to form a foamed poly(urethane-urea).
Claim 5
Dependent Claim
74 words
A water-miscible fluid composition comprising a water-miscible mixture, having an average molecular weight of about 1050-1250, in a compatible water-miscible solvent of a water-miscible isocyanate-terminated polyoxyethylene urethane prepolymer having a molecular weight of about 1350 and a water-miscible isocyanate-terminated polyoxyethylene urethane prepolymer having a molecular weight of about 950, said prepolymer components having a plurality of oxyethylene units sufficient to render the same water-miscible and being reactable with water to form a foamed poly(urethane-urea).
Claim 6
Dependent Claim
11 words
The composition according to claim 2 wherein said solvent is acetone.
Claim 7
Dependent Claim
16 words
The composition according to claim 3, further comprising a tertiary amine catalyst and a nonionic surfactant.
Claim 8
Dependent Claim
21 words
The composition according to claim 2 wherein said prepolymer components are the reaction products of poly(oxyethylene) glycol and excess tolylene diisocyanate.
Claim 9
Dependent Claim
64 words
A fluid water-miscible fluid composition comprising a water-miscible mixture, in a compatible water-miscible solvent, of an isocyanate-terminated polyoxyethylene urethane prepolymer component having a molecular weight of about 850-1000 and an isocyanate-terminated polyoxyethylene urethane prepolymer component having a molecular weight of about 1250-1550, said mixture having an average molecular weight of about 1000-1300, said prepolymer components being reactable with water to form a foamed poly(urethane-urea).
Claim 10
Dependent Claim
64 words
A fluid water-miscible fluid composition comprising a water-miscible mixture, in a compatible water-miscible solvent, of an isocyanate-terminated polyoxyethylene urethane prepolymer component having a molecular weight of about 850-1000 and an isocyanate-terminated polyoxyethylene urethane prepolymer component having a molecular weight of about 1250-1550, said mixture having an average molecular weight of about 1000-1300, said prepolymer components being reactable with water to form a foamed poly(urethane-urea).
Claim 11
Dependent Claim
159 words
A water-miscible fluid composition comprising a water-miscible mixture of two isocyanate-terminated urethane prepolymer components having a formula Y{(RO).sub.o --C(O)NH--R'(NCO).sub.p }.sub.z where Y is the active hydrogen-free residue of a compound having a plurality of active hydrogen atoms, (RO) o is a hydrophilic poly(oxyalkylene) chain made up of oxyethylene units or oxyethylene and oxypropylene units, said chain having a plurality of oxyethylene units sufficient to make said prepolymer components water-miscible, R' is the isocyanate-free residue of a polyisocyanate, p is an integer of 1-5, and z is an integer equal to the number of active hydrogens present in said compound, one of said prepolymer components having a molecular weight of about 850-1000 and the other of said prepolymer components having a molcular weight of about 1250-1550 with the average molecular weight of said mixture of prepolymer components being about 1000-1300, said prepolymer components being dissolved in a polar water-miscible solvent and being reactable with water to form a foamed poly(urethane-urea).
Claim 12
Dependent Claim
159 words
A water-miscible fluid composition comprising a water-miscible mixture of two isocyanate-terminated urethane prepolymer components having a formula Y{(RO).sub.o --C(O)NH--R'(NCO).sub.p }.sub.z where Y is the active hydrogen-free residue of a compound having a plurality of active hydrogen atoms, (RO) o is a hydrophilic poly(oxyalkylene) chain made up of oxyethylene units or oxyethylene and oxypropylene units, said chain having a plurality of oxyethylene units sufficient to make said prepolymer components water-miscible, R' is the isocyanate-free residue of a polyisocyanate, p is an integer of 1-5, and z is an integer equal to the number of active hydrogens present in said compound, one of said prepolymer components having a molecular weight of about 850-1000 and the other of said prepolymer components having a molcular weight of about 1250-1550 with the average molecular weight of said mixture of prepolymer components being about 1000-1300, said prepolymer components being dissolved in a polar water-miscible solvent and being reactable with water to form a foamed poly(urethane-urea).
Claim 13
Dependent Claim
140 words
A water-miscible fluid composition comprising a water-miscible mixture of two isocyanate-terminated urethane prepolymer components having the formula Y{(CH.sub.2 CH.sub.2 O).sub.n --C(O)NH--R'(NCO).sub.p }.sub.z where Y is the active hydrogen-free residue of a compound having a plurality of active hydrogens, n is the number of oxyethylene units sufficient to make said prepolymers water-miscible, R' is the isocyanate-free residue of a polyisocyanate, p is an integer of 1-5, and z is an integer equal to the number of active hydrogens present in said compound, one of said prepolymer components having a molecular weight of about 850-1000 and the other of said prepolymers having a molecular weight of about 1250-1550 with the average molecular weight of said mixture of prepolymer components being about 1000-1300, said prepolymer components being dissolved in a polar water-miscible solvent and being reactable with water to form a foamed poly(urethane-urea).
Claim 14
Dependent Claim
140 words
A water-miscible fluid composition comprising a water-miscible mixture of two isocyanate-terminated urethane prepolymer components having the formula Y{(CH.sub.2 CH.sub.2 O).sub.n --C(O)NH--R'(NCO).sub.p }.sub.z where Y is the active hydrogen-free residue of a compound having a plurality of active hydrogens, n is the number of oxyethylene units sufficient to make said prepolymers water-miscible, R' is the isocyanate-free residue of a polyisocyanate, p is an integer of 1-5, and z is an integer equal to the number of active hydrogens present in said compound, one of said prepolymer components having a molecular weight of about 850-1000 and the other of said prepolymers having a molecular weight of about 1250-1550 with the average molecular weight of said mixture of prepolymer components being about 1000-1300, said prepolymer components being dissolved in a polar water-miscible solvent and being reactable with water to form a foamed poly(urethane-urea).
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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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |