US4120884A
Expired / Lapsed
US
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Storage-stable, liquid polyisocyanates possessing carbodiimide groups, and process for their manufacture
Assignee: BASF SE
•
Filing: 1977-01-28
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Granted: 1978-10-17
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Expires: 1997-01-28
Abstract
Abstract Storage-stable, liquid, only slightly colored polyisocyanates possessing carbodiimide groups and having an isocyanate content of from about 25 to 35% by weight, based on total weight; these products are obtained by condensing polyisocyanates in the presence of phospholines, phospholidines and/or their oxides, and stopping the condensation and stabilizing the condensation products with the Lewis acids, aromatic carboxylic acid halides, aromatic sulfonic acid esters and/or alkyl sulfates.
Inventors
- 👤 Frank Peter Woerner
- 👤 Peter T. Kan
- 👤 Georg Falkenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
An improved storage-stable, liquid polyisocyanate possessing carbodiimide groups, which contains from about 25 to about 35% by weight, based on the total weight, of NCO groups, obtained by condensing a polyisocyanate in the presence of a catalyst selected from the group consisting of phospholine, phospholidine, phospholine oxide and phospholidine oxide wherein the improvement consists in that condensation has been stopped and the condensation product stabilized by a stopper selected from the group consisting of iron (III) chloride, benzoyl chloride, methyl-p-toluenesulfonate and dimethylsulfate.
Claim 2
Dependent Claim
82 words
An improved storage-stable, liquid polyisocyanate possessing carbodiimide groups, which contains from about 25 to about 35% by weight, based on the total weight, of NCO groups, obtained by condensing a polyisocyanate in the presence of a catalyst selected from the group consisting of phospholine, phospholidine, phospholine oxide and phospholidine oxide wherein the improvement consists in that condensation has been stopped and the condensation product stabilized by a stopper selected from the group consisting of iron (III) chloride, benzoyl chloride, methyl-p-toluenesulfonate and dimethylsulfate.
Claim 3
Dependent Claim
16 words
A storage-stable, liquid polyisocyanate possessing carbodiimide groups, as claimed in claim 1, derived from 4,4'-diphenylmethane diisocyanate.
Claim 4
Dependent Claim
13 words
The polyisocyanate as claimed in claim 1, wherein the stopper is benzoyl chloride.
Claim 5
Dependent Claim
99 words
In a process for the manufacture of a storage-stable, liquid polyisocyanate possessing carbodiimide groups, which contains from about 25 to 35% by weight, based on the total weight, of NCO groups by condensing a polyisocyanate in the presence of a catalyst selected from the group consisting of phospholine, phospholidine, phospholine oxide and phospholidine oxide, the improvement which comprises: stopping the condensation, after reaching the desired degree of condensation, by a stopper selected from the group consisting of iron (III) chloride, benzoyl chloride, methyl-p-toluenesulfonate and dimethyl sulfate and at the same time stabilizing the product by means of the stopper.
Claim 6
Dependent Claim
99 words
In a process for the manufacture of a storage-stable, liquid polyisocyanate possessing carbodiimide groups, which contains from about 25 to 35% by weight, based on the total weight, of NCO groups by condensing a polyisocyanate in the presence of a catalyst selected from the group consisting of phospholine, phospholidine, phospholine oxide and phospholidine oxide, the improvement which comprises: stopping the condensation, after reaching the desired degree of condensation, by a stopper selected from the group consisting of iron (III) chloride, benzoyl chloride, methyl-p-toluenesulfonate and dimethyl sulfate and at the same time stabilizing the product by means of the stopper.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 4 wherein the polyisocyanate possessing carbodiimide groups contains from 28 to 31% by weight, based on the total weight, of NCO groups.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 4 wherein the catalyst is employed in an amount of from about 0.0004 to 0.009% by weight, based on the weight of polyisocyanate.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 4 wherein 4,4'-diphenylmethane diisocyanate or a mixture of 4,4'-diphenylmethane diisocyanate and toluylene diisocyanate is used as polyisocyanate starting material.
Claim 10
Dependent Claim
13 words
The process as claimed in claim 4, wherein the stopper is benzoyl chloride.
References Cited (Backward Citations)
GB1404301A
Cited
US4014935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |