US4476253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyurethane elastomers using diols of the anhydro-tetritol series
Assignee: Bayer AG
•
Filing: 1984-01-11
•
Granted: 1984-10-09
•
Expires: 2004-01-11
Abstract
Abstract Polyurethane elastomers are made by reacting organic polyisocyanates with compounds having at least two groups containing isocyanate-reactive hydrogen atoms and a molecular weight of from 400 to 10,000 and a 1,4-monoanhydro-tetritol in accordance with techniques known to those in the art. Known chain-lengthening agents, auxiliaries and additives may be included in the reaction mixture. The reaction mixtures employed in the process of the present invention have a longer pot life than prior art reaction mixtures. The elastomers produced by this process are shrink stable.
Inventors
- 👤 Herbert Salzburg
- 👤 Holger Meyborg
- 👤 Wilhelm Goyert
- 👤 James M. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:39
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3218; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A process for the production of polyurethane elastomers comprising reacting: (a) an organic polyisocyanate with (b) a compound having at least two groups containing isocyanate-reactive hydrogen atoms and a molecular weight within the range of 400 to 10,000 and (c) a 1,4-monoanhydro-tetritol.
Claim 2
Dependent Claim
42 words
A process for the production of polyurethane elastomers comprising reacting: (a) an organic polyisocyanate with (b) a compound having at least two groups containing isocyanate-reactive hydrogen atoms and a molecular weight within the range of 400 to 10,000 and (c) a 1,4-monoanhydro-tetritol.
Claim 3
Dependent Claim
11 words
The process of claim 1 in which component (c) is 1,4-monoanhydro-erythritol.
Claim 4
Dependent Claim
15 words
The process of claim 1 in which component (c) is 1,4-monoanhydro-erythritol in admixture with 1,4-monoanhydro-threitol.
Claim 5
Dependent Claim
23 words
The process of claim 1 in which component (c) is a mixture of 1,4-monoanhydro-erythritol and 1,4-monoanhydro-threitol containing at least 20 wt. % 1,4-monoanhydro-erythritol.
Claim 6
Dependent Claim
36 words
The process of claim 1 in which (d) a chain-lengthening agent having at least two groups containing isocyanate-reactive hydrogen atoms and having a molecular weight of from 62 to 399 other than a 1,4-monoanhydro-tetritol is employed.
Claim 7
Dependent Claim
18 words
The process of claim 5 in which the chain-lengthening agent (d) is a diol or an aromatic diamine.
Claim 8
Dependent Claim
24 words
The process of claim 5 in which at least 50 mol % of the total of monoanhydro-tetritol and chain-lengthening agent (d) is a monoanhydro-tetritol.
Claim 9
Dependent Claim
40 words
The process of claim 1 in which a material selected from the group consisting of catalysts, blowing agents, reaction retarders, cell regulators, pigments, dyes, flame retarding agents, emulsifiers, stabilizers, plasticizers, fillers, fungistatic and bacteriostatic substances and mixtures thereof is employed.
References Cited (Backward Citations)
EP0052295A2
Cited
US4383051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |