Patent US4303773A successfully refreshed from Google Patents.
US4303773A
Expired / Lapsed
US
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Process for the production of polyurethane urea elastomers
Assignee: Bayer AG
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Filing: 1980-05-09
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Granted: 1981-12-01
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Expires: 2000-05-09
Abstract
Abstract This invention relates to a process for the production of non-cellular polyurethane ureas elastomers using a chain-extender mixture produced from asymmetrically alkyl-substituted anilines by condensation with formaldehyde. The chain-extending agents used in the instant invention show medium reactivity to compounds containing isocyanate groups. These chain-extending agents may be processed both in high-pressure and in low-pressure metering and mixing units because they are either liquid at room temperature or can be melted at relatively low temperatures (below 55° C.). The homogeneous, i.e. non-cellular, polyurethane urea elastomers obtained in the instant invention are distinguished by having excellent mechanical properties.
Inventors
- 👤 Otto Ganster
- 👤 Hans J. Meiners
- 👤 Willi Eifler
- 👤 Holger Meyborg
- 👤 Jurgen Schwindt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6529; C08G18/08; C08G18/10; C08G18/2805; C08G18/30; C08G18/32; C08G18/3225; C08G18/3237; C08G18/3243; C08G2120/00; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A process for the production of non-cellular polyurethane urea elastomers comprising reacting: (a) polyisocyanates, (b) compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range of from 400 to 15,000, and (c) alkyl-substituted diaminodiphenyl methanes, characterized in that component (c) is prepared by condensing formaldehyde with alkyl-substituted anilines corresponding to the formulae: ##STR6## with a molar ratio of A to B of from 1:4 to 4:1, wherein R 1 , and R 3 which may be the same or different, represent hydrogen or an alkyl group containing 1 to 4 carbon atoms, and R 2 and R 4 which may be the same or different represent an alkyl radical containing from 1 to 4 carbon atoms and wherein A and B are not the same.
Claim 2
Dependent Claim
131 words
A process for the production of non-cellular polyurethane urea elastomers comprising reacting: (a) polyisocyanates, (b) compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range of from 400 to 15,000, and (c) alkyl-substituted diaminodiphenyl methanes, characterized in that component (c) is prepared by condensing formaldehyde with alkyl-substituted anilines corresponding to the formulae: ##STR6## with a molar ratio of A to B of from 1:4 to 4:1, wherein R 1 , and R 3 which may be the same or different, represent hydrogen or an alkyl group containing 1 to 4 carbon atoms, and R 2 and R 4 which may be the same or different represent an alkyl radical containing from 1 to 4 carbon atoms and wherein A and B are not the same.
Claim 3
Dependent Claim
34 words
A process as claimed in claim 1, wherein component (c) is a formaldehyde condensation product of the alkyl-substituted anilines A and B with a molar ratio of A to B from 1:3 to 3:1.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1 or 2, wherein component (c) is a formaldehyde condensation product of equimolar quantities of the alkyl-substituted anilines A and B.
Claim 5
Dependent Claim
46 words
A process as claimed in claim 1, wherein component (c) contains at least 25 mol percent of an asymmetrically substituted 4,4'diaminodiphenyl methane corresponding to the formula: ##STR7## wherein R 1 , R 2 , R 3 , and R 4 are defined as in claim 1.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 4, wherein component (c) contains from 40 to 65 mol percent of the compound corresponding to the formula: ##STR8##
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1, wherein a formaldehyde condensation product of 2-ethylaniline and 2-isopropyl aniline is used as component (c).
Claim 8
Dependent Claim
23 words
A process as claimed in claim 1, wherein a formaldehyde condensation product of 2-ethyl aniline and 2,6-diethyl aniline is used as component (c).
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1, wherein a formaldehyde condensation product of 2-ethyl aniline and 2,6-diisopropyl aniline is used as component (c).
Claim 10
Dependent Claim
22 words
A process as claimed by claim 1, wherein a formaldehyde condensation product of 2,6-diethylaniline and 2,6-diisopropyl aniline is used as component (c).
Claim 11
Dependent Claim
36 words
The process of claim 1, wherein up to 100 mol percent, based on (c) of compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 32 to 400 are also present.
Claim 12
Dependent Claim
18 words
The process of claim 1, wherein the reaction is conducted in the presence of catalyst and other additives.
Claim 13
Dependent Claim
23 words
The process of claim 1, wherein R 1 , R 2 , R 3 , and/or R 4 represent a branched alkyl group.
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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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |