Patent US4146723A successfully refreshed from Google Patents.
US4146723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic diisocyanates and a process for making polyurethanes and polyurethane-ureas
Assignee: Bayer AG
•
Filing: 1974-04-02
•
Granted: 1979-03-27
•
Expires: 1994-04-02
Abstract
Abstract Novel heterocyclic diisocyanates are prepared by reacting a urea diisocyanate of the formula ##STR1## IN WHICH B is a divalent organic radical and n is an integer of 1 to 3 with a compound having the formula Hal--y--Hal in which y is --C--C--; --C--S--; --C--N--C--; --S--N--C. The novel heterocyclic diisocyanates are useful in making polyurethanes and polyurethane-ureas having improved chemical and temperature resistance.
Inventors
- 👤 Kurt Findeisen
- 👤 Kuno Wagner
- 👤 Erich Klauke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:30
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/08; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/775; C08G18/78; C08G18/7875; C08G18/7887
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
A diisocyanate having the formula ##STR8## in which B represents a phenylene radical or a ddiphenyll methane radical each of which may be substituted one or more times with alkyl groups; y represents a divalent radical containing a sequence of --C--C-- atoms in the linear chain, and n is an integer from 1 to 3.
Claim 2
Dependent Claim
55 words
A diisocyanate having the formula ##STR8## in which B represents a phenylene radical or a ddiphenyll methane radical each of which may be substituted one or more times with alkyl groups; y represents a divalent radical containing a sequence of --C--C-- atoms in the linear chain, and n is an integer from 1 to 3.
Claim 3
Dependent Claim
6 words
A compound of the formula ##STR9##
Claim 4
Dependent Claim
6 words
A compound of the formula ##STR9##
Claim 5
Dependent Claim
16 words
A process for preparing diisocyanates which comprises reacting (1) a urea diisocyanate of the formula ##STR10##
Claim 6
Dependent Claim
16 words
A process for preparing diisocyanates which comprises reacting (1) a urea diisocyanate of the formula ##STR10##
Claim 7
Dependent Claim
126 words
in which B represents a divalent aliphatic radical, a cycloaliphatic radical, an araliphatic radical, an aromatic radical, a multi-nuclear aromatic radical bridged by methylene, oxygen or sulphur groups and any one of said radicals substituted one or more times with an alkyl group or an alkoxy group having one to six carbon atoms or with chlorine, and n is an integer of from 1 to 3 with (2) a compound of the formula: Hal-- y-- Hal, in which y represents a divalent radical containing one of the following sequence of atoms --C--C; --C--S--; --C--N--C--; or --S--N--C-- in the linear chain, and Hal represents a halogen atom, said reaction being conducted at a temperature from 0° to 200° C. and said reaction being accompanied by ring closure.
Claim 8
Dependent Claim
126 words
in which B represents a divalent aliphatic radical, a cycloaliphatic radical, an araliphatic radical, an aromatic radical, a multi-nuclear aromatic radical bridged by methylene, oxygen or sulphur groups and any one of said radicals substituted one or more times with an alkyl group or an alkoxy group having one to six carbon atoms or with chlorine, and n is an integer of from 1 to 3 with (2) a compound of the formula: Hal-- y-- Hal, in which y represents a divalent radical containing one of the following sequence of atoms --C--C; --C--S--; --C--N--C--; or --S--N--C-- in the linear chain, and Hal represents a halogen atom, said reaction being conducted at a temperature from 0° to 200° C. and said reaction being accompanied by ring closure.
Claim 9
Dependent Claim
23 words
The process of claim 3 wherein the reaction is conducted in a liquid organic diluent which is non-reactive with the reactants and product.
Claim 10
Dependent Claim
21 words
The process of claim 3 wherein y represents a divalent radical containing a --C--C-- sequence of atoms in the linear chain.
References Cited (Backward Citations)
US2526757A
Cited
US2514353A
Cited
US3410866A
Cited
GB1302248A
Cited
GB1303323A
Cited
US3787435A
Cited
US3912754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |