US4055549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastically processable polyurethanes based on tolylene diisocyanate
Assignee: Union Carbide Corp
•
Filing: 1976-05-05
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Granted: 1977-10-25
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Expires: 1996-05-05
Abstract
Abstract Thermoplastically processable polyurethanes are produced by the reaction of tolylene diisocyanate, at least one polycaprolactone diol, a low molecular weight diol chain extender and water.
Inventors
- 👤 Rene Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8045; C08G18/28; C08G18/30; C08G18/302; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
64 words
A method for producing a thermoplastically processable polyurethane, which comprises simultaneously reacting a. a polycaprolactone diol having a molecular weight of from 1,000 to 4,000; b. a low molecular weight diol chain extender; c. tolylene diisocyanate; and d. water, the mole ratio of a:b:c:d employed in the reaction being 1:3-6:8-14:2-7 and the ratio of c:d employed in the reaction being from 2:1 to 4:1.
Claim 2
Independent Claim
64 words
A method for producing a thermoplastically processable polyurethane, which comprises simultaneously reacting a. a polycaprolactone diol having a molecular weight of from 1,000 to 4,000; b. a low molecular weight diol chain extender; c. tolylene diisocyanate; and d. water, the mole ratio of a:b:c:d employed in the reaction being 1:3-6:8-14:2-7 and the ratio of c:d employed in the reaction being from 2:1 to 4:1.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, wherein the polycaprolactone diol has a molecular weight of from 2,000 to 3,000.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, wherein the mole ratio of a:b:c:d employed in the reaction is 1:4-5:10-12:2.5-6.
Claim 5
Dependent Claim
42 words
A method as claimed in claim 1, wherein the low molecular weight diol chain extender is chosen from the group consisting of the alkanediols having from 2 to 10 carbon atoms and the polyalkyleneoxy glycols having from 2 to 10 carbon atoms.
Claim 6
Dependent Claim
19 words
A method as claimed in claim 1, wherein the mole ratio of c:d employed in the reaction is 2:1.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 3, wherein the mole ratio of c:d employed in the reaction is 2:1.
Claim 8
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 1.
Claim 9
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 2.
Claim 10
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 3.
Claim 11
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 4.
Claim 12
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 5.
Claim 13
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 6.
Claim 14
Independent Claim
83 words
A method of producing a thermoplastically processable polyurethane, which comprises the steps of: a. prereacting (i) tolylene diisocyanate and (ii) water to form N,N'-di(isocyanatotolylene)urea; then b. reacting the N,N'-di(isocyanatotolylene)urea thus formed with (iii) a polycaprolactone diol having a molecular weight of from 1,000 to 4,000 and (iv) a low molecular weight diol chain extender, the overall mole ratio of i:ii:iii:iv employed in steps (a) and (b) being 8-14:2-7:1:3-6 and the mole ratio of i:ii employed in step (a) being from 2:1 to 4:1.
Claim 15
Independent Claim
83 words
A method of producing a thermoplastically processable polyurethane, which comprises the steps of: a. prereacting (i) tolylene diisocyanate and (ii) water to form N,N'-di(isocyanatotolylene)urea; then b. reacting the N,N'-di(isocyanatotolylene)urea thus formed with (iii) a polycaprolactone diol having a molecular weight of from 1,000 to 4,000 and (iv) a low molecular weight diol chain extender, the overall mole ratio of i:ii:iii:iv employed in steps (a) and (b) being 8-14:2-7:1:3-6 and the mole ratio of i:ii employed in step (a) being from 2:1 to 4:1.
Claim 16
Dependent Claim
16 words
A method as claimed in claim 13, wherein step (b) is carried out in an extruder.
Claim 17
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 13.
Claim 18
Dependent Claim
11 words
The thermoplastically processable polyurethane produced by the method of claim 13.
References Cited (Backward Citations)
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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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |