US4071505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molecular weight control of polyurethane elastomers
Assignee: Bayer AG
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Filing: 1975-10-15
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Granted: 1978-01-31
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Expires: 1995-10-15
Abstract
Abstract Polyurethane elastomers are prepared by reacting organic polyisocyanates with organic polyhydroxyl compounds and a mono-functional secondary hydroxyl group containing chain terminator. The chain terminator can be added to the polyhydroxyl compound prior to the reaction with the polyisocyanate.
Inventors
- 👤 Walter Meckel
- 👤 J. W. Britain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/2815; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
137 words
A process for producing elastomeric polyurethanes comprising reacting organic polyisocyanates with organic polyhydroxyl compounds having a molecular weight of from about 800 to about 5,000, containing at least two OH groups reactive with NCO groups such that the NCO/OH ratio is from about 0.9:1 to about 1.1:1 and incorporating into the reaction mixture a chain terminator having the general formula: ##STR2## wherein R and R' are the same or different and represent alkyl groups containing at least 3 carbon atoms which may be branched in the α- or β-positions, which may be substituted with halogen atoms, and which may contain hetero atoms in the form of esters or ethers, and wherein the chain terminator is present in an amount from about 0.1 percent to about 3 percent based on the molecular equivalent of all available OH groups.
Claim 2
Dependent Claim
137 words
A process for producing elastomeric polyurethanes comprising reacting organic polyisocyanates with organic polyhydroxyl compounds having a molecular weight of from about 800 to about 5,000, containing at least two OH groups reactive with NCO groups such that the NCO/OH ratio is from about 0.9:1 to about 1.1:1 and incorporating into the reaction mixture a chain terminator having the general formula: ##STR2## wherein R and R' are the same or different and represent alkyl groups containing at least 3 carbon atoms which may be branched in the α- or β-positions, which may be substituted with halogen atoms, and which may contain hetero atoms in the form of esters or ethers, and wherein the chain terminator is present in an amount from about 0.1 percent to about 3 percent based on the molecular equivalent of all available OH groups.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the NCO/OH ratio is from about 0.95:1 to about 1.05:1.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein from about 0.2 to about 2 percent of chain terminator based on the molecular equivalent of all available OH groups is incorporated.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the chain terminator is diisobutylcarbinol.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the chain terminator is diisopropylcarbinol.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the chain terminator is 2,6,8-trimethylnonanol-4.
Claim 8
Dependent Claim
33 words
The process of claim 1 wherein the reactor mixture also contains a chain extender in the form of a diol having a molecular weight in the range from about 62 to about 400.
Claim 9
Dependent Claim
10 words
A polyurethane elastomer prepared by the process of claim 1.
References Cited (Backward Citations)
US3622542A
Cited
US3718622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |