US4245081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of thermoplastic polyurethane elastomers
Assignee: Bayer AG
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Filing: 1979-04-13
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Granted: 1981-01-13
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Expires: 1999-04-13
Abstract
Abstract The instant invention is directed to a continuous process for the production of thermoplastic polyurethanes by reacting A. one or more substantially linear polyols having molecular weights in the range from 400 to 10,000, B. one or more organic diisocyanates and C. a hydroxyl-group-containing chain extender having a molecular weight below 250, the ratio of the NCO-groups in component (B) to the Zerewitinoff-active groups in components (A) and (C) lying between 0.90 and 1.2, in extruders, characterized in that the chain extender (C) used is a mixture of at least two different glycols, of which one is present in a quantity of from 50 to 99% by weight, based on the total amount of component (C), and a second in a quantity of from 1 to 50% by weight, based on the total amount of component (C).
Inventors
- 👤 Bernd Quiring
- 👤 Georg Niederdellmann
- 👤 Wilhelm Goyert
- 👤 Hans Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6511; B; B01; B01J; B01J19/00; B01J19/18; B01J19/20; C08G18/08; C08G18/0895; C08G18/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A continuous process for the production of thermoplastic polyurethanes by reacting A. one or more substantially linear polyols having molecular weights in the range from 400 to 10,000, B. One or more organic diisocyanates and C. a hydroxyl-group-containing chain extender having a molecular weight below 250, the ratio of the NCO-groups in component (B) to the Zerewitinoff-active groups in components (A) and (C) lying between 0.90 and 1.2, in extruders, characterized in that the chain extender (C) used is a mixture of at least two different glycols, of which one is present in a quantity of from 50 to 90% by weight, based on the total amount of component (C), and a second in a quantity of from 1 to 50% by weight, based on the total amount of component (C).
Claim 2
Dependent Claim
131 words
A continuous process for the production of thermoplastic polyurethanes by reacting A. one or more substantially linear polyols having molecular weights in the range from 400 to 10,000, B. One or more organic diisocyanates and C. a hydroxyl-group-containing chain extender having a molecular weight below 250, the ratio of the NCO-groups in component (B) to the Zerewitinoff-active groups in components (A) and (C) lying between 0.90 and 1.2, in extruders, characterized in that the chain extender (C) used is a mixture of at least two different glycols, of which one is present in a quantity of from 50 to 90% by weight, based on the total amount of component (C), and a second in a quantity of from 1 to 50% by weight, based on the total amount of component (C).
Claim 3
Dependent Claim
26 words
The process of claim 1, characterized in that component (C) is a mixture of two glycols in a ratio by weight of from 99:1 to 90:10.
Claim 4
Dependent Claim
18 words
The process of claim 1, characterized in that components (A), (B) and (C) are reacted in multiscrew extruders.
Claim 5
Dependent Claim
21 words
The process of claim 3, characterized in that the extruder comprises two screws with self-cleaning geometry rotating in the same direction.
Claim 6
Dependent Claim
19 words
The process of claim 1, where the molar ratio of components (A) and (C) is from 1:50 to 5:1.
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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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |