US4293680A
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US
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Process for the production of diisocyanato toluene mixtures having an increased content of 2,6-diisocyanato toluene, and the use thereof as synthesis components in the production of polyurethane elastomers
Assignee: Bayer AG
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Filing: 1980-08-06
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Granted: 1981-10-06
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Expires: 2000-08-06
Abstract
Abstract The instant invention is directed to a process for the production of diisocyanate mixtures of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene, comprising: trimerizing some of the isocyanate groups of a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having a maximum content of 2,6-diisocyanato toluene of 35% by weight based on the total mixture and isolating from the reaction mixture which is thus obtained, a diisocyanate mixture having an increased content of 2,6-diisocyanato toluene. The invention is also directed to the use of these mixtures as synthesis components in the production of polyurethane elastomers.
Inventors
- 👤 Jan Mazanek
- 👤 Hanns P. Nuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:41
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; C07; C07C; C07C263/00; C07C263/18; C07C263/20; C08G18/02; C08G18/022; C08G18/08; C08G18/16; C08G18/18; C08G18/1825; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3206; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/48; C08G18/4833
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A process for the production of diisocyanate mixtures of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene, comprising: trimerizing some of the isocyanate groups of a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having a maximum content of 2,6-diisocyanato toluene of 35% by weight based on the total mixture and isolating from the reaction mixture which is thus obtained, a diisocyanate mixture having an increased content of 2,6-diisocyanato toluene.
Claim 2
Dependent Claim
82 words
A process for the production of diisocyanate mixtures of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene, comprising: trimerizing some of the isocyanate groups of a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having a maximum content of 2,6-diisocyanato toluene of 35% by weight based on the total mixture and isolating from the reaction mixture which is thus obtained, a diisocyanate mixture having an increased content of 2,6-diisocyanato toluene.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein said 2,6-diisocyanato toluene is present in the reaction mixture thus obtained in an amount of from 45 to 85%.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein said starting diisocyanate mixture contains at least 99% by weight of 2,4- and 2,6-diisocyanato toluene.
Claim 5
Dependent Claim
93 words
In a process for the production of polyurethane elastomers comprising: reacting an organic polyisocyanate with a higher molecular weight polyhydroxyl compound and a chain lengthening agent in a one stage or two stage process, the improvement wherein (a) said organic polyisocyanate is a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene and (b) said chain lengthening agent is an aliphatic glycol which optionally contains ether bridges, having a molecular weight in the range of from 62 to 200.
Claim 6
Dependent Claim
93 words
In a process for the production of polyurethane elastomers comprising: reacting an organic polyisocyanate with a higher molecular weight polyhydroxyl compound and a chain lengthening agent in a one stage or two stage process, the improvement wherein (a) said organic polyisocyanate is a diisocyanate mixture of 2,4-diisocyanato toluene and 2,6-diisocyanato toluene, having from 36 to 90% by weight, based on the total mixture, of 2,6-diisocyanato toluene and (b) said chain lengthening agent is an aliphatic glycol which optionally contains ether bridges, having a molecular weight in the range of from 62 to 200.
Claim 7
Dependent Claim
23 words
The process of claim 4, wherein said 2,6-diisocyanato toluene is present in said diisocyanate mixture in an amount of from 45 to 85%.
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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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |