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US4119658A
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Aromatic isocyanato-polysulphonic acids
Assignee: Bayer AG
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Filing: 1977-03-30
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Granted: 1978-10-10
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Expires: 1997-03-30
Abstract
Abstract The present invention relates to isocyanato-polysulphonic acids comprising from 1 to 3 aromatically bound isocyanate groups which may be present at least partly in the dimerized form as uretdione groups and from 2 to 6 sulphonic acid groups for each non-dimerized isocyanato-polysulphonic acid or for each monomeric isocyanato-polysulphonic acid on which the dimer is based. These acids are produced by reacting mono- or poly-isocyanates having exclusively aromatically bound isocyanate groups with sulphur trioxide at -10° C to 140° C, wherein the isocyanate used as starting material which is to be sulphonated is reacted with at least 50% by weight of sulphur trioxide, based on the quantity of isocyanate used as starting material. Alternatively they may be produced using isocyanate-monosulphonic acids which have exclusively aromatically bound isocyanate-groups.
Inventors
- 👤 Dieter Dieterich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/798; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0828; C08G18/775
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
51 words
Solid Isocyanatopolysulphonic acids comprising from 1 to 3 aromatically bound isocyanate groups which may be present at least partly in the dimerized form as uretdione groups and from 2 to 6 sulphonic acid groups for each non-dimerized isocyanatopolysulphonic acid or for each monomeric isocyanatopolysulphonic acid on which the dimer is based.
Claim 2
Dependent Claim
51 words
Solid Isocyanatopolysulphonic acids comprising from 1 to 3 aromatically bound isocyanate groups which may be present at least partly in the dimerized form as uretdione groups and from 2 to 6 sulphonic acid groups for each non-dimerized isocyanatopolysulphonic acid or for each monomeric isocyanatopolysulphonic acid on which the dimer is based.
Claim 3
Dependent Claim
20 words
The isocyanatopolysulphonic acids of claim 1 which are in the form of the salt with an inorganic or organic base.
Claim 4
Dependent Claim
15 words
The acids of claim 1 which have a sulphur content of from 15 to 24%.
Claim 5
Dependent Claim
84 words
Solid Isocyanatopolysulphonic acids of the formula (OCN).sub.n R(SO.sub.3 H).sub.m which may be present in the dimerized form containing uretdione groups, in which formula R represents a mononuclear, dinuclear or trinuclear aromatic hydrocarbon group having a total of 6 to 20 carbon atoms, which may be interrupted by alkylene groups having 1 to 3 carbon atoms or substituted by alkyl groups having 1 to 4 carbon atoms; n represents an integer of from 1 to 3; and m an integer of from 2 to 6.
Claim 6
Dependent Claim
84 words
Solid Isocyanatopolysulphonic acids of the formula (OCN).sub.n R(SO.sub.3 H).sub.m which may be present in the dimerized form containing uretdione groups, in which formula R represents a mononuclear, dinuclear or trinuclear aromatic hydrocarbon group having a total of 6 to 20 carbon atoms, which may be interrupted by alkylene groups having 1 to 3 carbon atoms or substituted by alkyl groups having 1 to 4 carbon atoms; n represents an integer of from 1 to 3; and m an integer of from 2 to 6.
Claim 7
Dependent Claim
63 words
The isocyanatopolysulphonic acids of the formula of claim 4 in which formula n = 2, m represents an integer of from 2 to 4 and R denotes a 4-6-valent mononuclear of dinuclear aromatic hydrocarbon group having a total of 6 to 13 carbon atoms and which may be methyl substituted if mononuclear and which may be interrupted by a methylene bridge if dinuclear.
Claim 8
Dependent Claim
20 words
The isocyanatopolysulphonic acids of claim 4 which are in the form of the salt with an inorganic or organic base.
Claim 9
Dependent Claim
63 words
A process for the preparation of solid aromatic isocyanatopolysulphonic acids comprising reacting monoisocyanates or polyisocyanates having exclusively aromatically bound isocyanate groups with sulphur trioxide at -10° C. to 140° C., wherein the isocyanate used as starting material which is to be sulphonated is reacted with at least 50% by weight of sulphur trioxide, based on the quantity of isocyanate used as starting material.
Claim 10
Dependent Claim
63 words
A process for the preparation of solid aromatic isocyanatopolysulphonic acids comprising reacting monoisocyanates or polyisocyanates having exclusively aromatically bound isocyanate groups with sulphur trioxide at -10° C. to 140° C., wherein the isocyanate used as starting material which is to be sulphonated is reacted with at least 50% by weight of sulphur trioxide, based on the quantity of isocyanate used as starting material.
Claim 11
Dependent Claim
23 words
The process of claim 6 wherein gaseous sulphur trioxide is passed over the surface of a reaction containing the isocyanate in anhydrous solvent.
Claim 12
Dependent Claim
28 words
A process for the preparation of isocyanatopolysulphonic acids having exclusively aromatically bound isocyanate groups comprising reacting isocyanatomonosulphonic acids which have exclusively aromatically bound isocyanate groups with sulphur trioxide.
Claim 13
Dependent Claim
28 words
A process for the preparation of isocyanatopolysulphonic acids having exclusively aromatically bound isocyanate groups comprising reacting isocyanatomonosulphonic acids which have exclusively aromatically bound isocyanate groups with sulphur trioxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |