US4761498A
Expired / Lapsed
US
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Diisocyanates and diisocyanate mixtures based on diphenylmethane, processes for their production and their use as isocyanate component in the production of polyurethane plastics by the isocyanate polyaddition process
Assignee: Bayer AG
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Filing: 1987-03-20
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Granted: 1988-08-02
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Expires: 2007-03-20
Abstract
Abstract The instant invention is directed to diisocyanates based on diphenylmethane which may be methyl-substituted and which are characterized in particular by isocyanate groups in the 3,4'- and optionally in the 3,2'-position. The instant invention is also directed to a number of independent processes for their production and to their use as isocyanate component in the production of polyurethanes.
Inventors
- 👤 Hartmut Knofel
- 👤 Michael Brockelt
- 👤 Gerhard Wegener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:53
CPC Classifications
C; C07; C07C; C07C265/00; C07C265/12; C07C205/00; C07C205/06; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
Diisocyanates corresponding to the formula: ##STR21## which may be present in admixture with 0 to 40% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR22## and optionally with 0 to 30% by weight, based on the total mixture, of other diisocyanatodiphenylmethane isomers which may be substituted; wherein two of the radicals R 1 , R 2 and R 3 represent hydrogen and one of the radicals R 1 , R 2 and R 3 represents a methyl group.
Claim 2
Dependent Claim
83 words
Diisocyanates corresponding to the formula: ##STR21## which may be present in admixture with 0 to 40% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR22## and optionally with 0 to 30% by weight, based on the total mixture, of other diisocyanatodiphenylmethane isomers which may be substituted; wherein two of the radicals R 1 , R 2 and R 3 represent hydrogen and one of the radicals R 1 , R 2 and R 3 represents a methyl group.
Claim 3
Dependent Claim
10 words
The diisocyanate of claim 1 corresponding to the formula: ##STR23##
Claim 4
Dependent Claim
10 words
The diisocyanate of claim 1 corresponding to the formula: ##STR24##
Claim 5
Dependent Claim
86 words
Diisocyanatodiphenylmethane isomer mixtures comprising from 30 to 60% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR25## and from 10 to 40% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR26## and from 0 to 30% by weight, based on the total mixture of other methyl-substituted diisocyanatodiphenylmethane isomers, wherein one of the radicals R 1 , R 2 or R 3 , in each of the formulae, represents a methyl group and the other two hydrogen.
Claim 6
Dependent Claim
86 words
Diisocyanatodiphenylmethane isomer mixtures comprising from 30 to 60% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR25## and from 10 to 40% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR26## and from 0 to 30% by weight, based on the total mixture of other methyl-substituted diisocyanatodiphenylmethane isomers, wherein one of the radicals R 1 , R 2 or R 3 , in each of the formulae, represents a methyl group and the other two hydrogen.
Claim 7
Dependent Claim
58 words
Diisocyanatodiphenylmethane isomer mixtures comprising from 30 to 60% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR27## and from 10 to 40% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR28## and from 0 to 30% by weight, based on the total mixture, of other methyl-substituted diisocyanatodiphenylmethane isomers.
Claim 8
Dependent Claim
58 words
Diisocyanatodiphenylmethane isomer mixtures comprising from 30 to 60% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR27## and from 10 to 40% by weight, based on the total mixture, of diisocyanates corresponding to the formula: ##STR28## and from 0 to 30% by weight, based on the total mixture, of other methyl-substituted diisocyanatodiphenylmethane isomers.
Claim 9
Dependent Claim
32 words
Diisocyanatodiphenylmethane isomer mixtures comprising from 70 to 90% by weight based on the total mixture, of 3,4'-diisocyanato-2-, -4-, and/or -6-methyldiphenylmethane and from 10 to 30% by weight of other methyl-substituted diisocyanatodiphenylmethane isomers.
Claim 10
Dependent Claim
32 words
Diisocyanatodiphenylmethane isomer mixtures comprising from 70 to 90% by weight based on the total mixture, of 3,4'-diisocyanato-2-, -4-, and/or -6-methyldiphenylmethane and from 10 to 30% by weight of other methyl-substituted diisocyanatodiphenylmethane isomers.
References Cited (Backward Citations)
US3152162A
Cited
US3180883A
Cited
US3375264A
Cited
US3526652A
Cited
US3644457A
Cited
US4014914A
Cited
US4189354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |