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US4144267A Expired / Lapsed US ⏱️ 0.0 years remaining

Organic polyisocyanates

Assignee: Bayer AG
•
Filing: 1974-11-26
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Granted: 1979-03-13
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Expires: 1994-11-26
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Abstract

Abstract Aromatic polyisocyanates containing sulphonic acid or sulphonate groups which are substantially free from crystalline product and a method for making them are provided wherein a mixture of aromatic polyisocyanates having an isocyanato content of from about 10% to about 42% by weight is sulphonated, the improvement which comprises mixing and reacting liquid aromatic polyisocyanates having a viscosity of from about 8 cP to about 49 cP at 25° C. and containing at least 40% by weight of phosgenation products of an aniline-phosgenation condensate and at least about 20% by weight of 2,6-tolylene diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate or a mixture thereof, based on the weight of said liquid aromatic polyisocyanates with a sulphonating agent in an amount equivalent to from about 0.1% to about 40% by weight sulphur trioxide, based on the weight of said liquid aromatic polyisocyanates.

Inventors

  • 👤 Dieter Dieterich
  • 👤 Peter Markusch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 06:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0828; C08G18/70; C08G18/72; C08G18/77; C08G18/775

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 138 words
Non-crystalline aromatic polyisocyanates, which contain sulphonic acid or sulphonate groups, prepared by a process comprising reacting at a temperature from -20° C. to 200° C.: (a) liquid multicomponent aromatic isocyanate mixtures having an NCO content of from 10 to 42% by weight, and having a viscosity of from 8 to 49 cP at 25° C., said liquid multicomponent aromatic isocyanate mixture containing: (i) at least 40% by weight of phosgenation products of aniline-formaldehyde condensates, and (ii) at least 20% by weight of 2,6-tolylene diisocyanate, 2,4'-diisocyanato-diphenylmethane, 2,2'-diisocyanato-diphenylmethane or mixtures thereof, said percents by weight being based on the total weight of said liquid multicomponent aromatic isocyanat mixtures, and (B) from 0.1 to 40% by weight, based on the weight of said liquid multicomponent isocyanate mixture, of sulphur trioxide, or an equivalent quantity of oleum, sulphuric acid, or chlorosulphonic acid.
Claim 2
Dependent Claim 138 words
Non-crystalline aromatic polyisocyanates, which contain sulphonic acid or sulphonate groups, prepared by a process comprising reacting at a temperature from -20° C. to 200° C.: (a) liquid multicomponent aromatic isocyanate mixtures having an NCO content of from 10 to 42% by weight, and having a viscosity of from 8 to 49 cP at 25° C., said liquid multicomponent aromatic isocyanate mixture containing: (i) at least 40% by weight of phosgenation products of aniline-formaldehyde condensates, and (ii) at least 20% by weight of 2,6-tolylene diisocyanate, 2,4'-diisocyanato-diphenylmethane, 2,2'-diisocyanato-diphenylmethane or mixtures thereof, said percents by weight being based on the total weight of said liquid multicomponent aromatic isocyanat mixtures, and (B) from 0.1 to 40% by weight, based on the weight of said liquid multicomponent isocyanate mixture, of sulphur trioxide, or an equivalent quantity of oleum, sulphuric acid, or chlorosulphonic acid.
Claim 3
Dependent Claim 41 words
The non-crystalline aromatic polyisocyanate of claim 1, having an isocyanate content of 20 to 42% by weight, a sulphonic acid and/or sulphonate group content of 0.1 to 6% by weight and a viscosity at 25° C. of 10 to 99 cP.
Claim 4
Dependent Claim 18 words
The non-crystalline aromatic polyisocyanate of claim 2, wherein said non-crystalling aromatic polyisocyanate is liquid at about 20° C.

References Cited (Backward Citations)

GB1278426A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-03-12 1982-09-11 1983-03-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-03-12 1986-09-11 1987-03-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-03-12 1990-09-11 1991-03-13 $7700.00 Window Closed / Lapsed

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