US3607837A
Expired / Lapsed
US
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Water-soluble urethane-urea polymers prepared by melt polymerization
Assignee: BASF Corp
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Filing: 1968-11-12
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Granted: 1971-09-21
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Expires: 1988-11-12
Abstract
Abstract Water-soluble urethane-urea polymers are prepared by the reaction of polyoxyalkylene glycols or copolymers of polyoxyalkylene glycols or blends thereof with an excess of organic polyisocyanates to form an isocyanate-terminated prepolymer, partially curing the prepolymer by exposing it to atmospheric moisture, and then chain-extending with a diamine. The reactions are carried out in the absence of a solvent.
Inventors
- 👤 Sidney L Reegen
- 👤 Bernard A Merkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/08; C08G18/10; C08G18/4825; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
19 words
The process of claim 1 wherein the polyoxyalkylene glycol has a molecular weight of from about 3,000 to 12,000.
Claim 2
Dependent Claim
24 words
The process of claim 1 wherein the organic polyisocyanate is toluene diisocyanate, tetramethylene diisocyanate, 4,4-diphenyl-methane diisocyanate, 1,5-naphthalene diisocyanate, m-xylylene diisocyanate, or methyl cyclohexane diisocyanate.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the diamine is ethylene diamine or 2-methylpiperazine.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the diamine carbamate is ethylene diamine carbamate or 2-methylpiperazine carbamate.
Claim 5
Dependent Claim
113 words
The process of claim 1 wherein the mixture of polyoxyalkylene glycol to organic polyisocyanate is such that the ratio of hydroxyl groups to isocyanate groups is from 1:1.4 to 1:1.9; the partially cured isocyanate-termiated prepolymer is the reaction product of an uncured isocyanate-terminated prepolymer and water from the atmosphere with the ratio of water to isocyanate groups being an amount sufficient to react with from about 20 percent of the free isocyanate groups of the uncured prepolymer to about 70 percent of the free isocyanate groups of the uncured prepolymer; and the ratio of isocyanate groups in said partially cured prepolymer to amine groups in said diamine is from 1.0:05 to 1.0: 1.5.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said polyoxyalkylene glycol is mixed with said organic polyisocyanate for a period of from about 0.01 to 1.5 hours.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein said isocyanate-terminated prepolymer is partially cured by contacting the prepolymer with the atmosphere for a period of at least 12 hours.
Claim 8
Dependent Claim
39 words
The process of claim 1 wherein the mixing of the partially cured mixture with a diamine is at a temperature in the range of about 65* to 180* C. for a period of from about 1 to 5 minutes.
Claim 9
Dependent Claim
38 words
The process of claim 1 wherein the mixing of a polyoxyalkylene glycol with stoichiometric excess of an organic polyisocyanate is carried out in the presence of a catalyst which is an organic tin compound or a tertiary amine.
Claim 10
Dependent Claim
13 words
The process of claim 10 wherein the organic tin compound is stannous octoate.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |