US4297456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for working up isocyanate distillation residues
Assignee: Bayer AG
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Filing: 1980-07-17
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Granted: 1981-10-27
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Expires: 2000-07-17
Abstract
Abstract This invention relates to a process for working up the distillation residue obtained in the commercial production of tolylene diisocyanate by grinding, optionally accompanied and/or followed by chemical modification reactions. The finely divided powder obtained may be used as a reactive filler in the production of a variety of plastics.
Inventors
- 👤 Artur Reischl
- 👤 Kuno Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:24
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/33; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/302; C08G18/40; C08G18/58; C08G18/64; C08G18/70; C08G18/72; C08G18/721; C08G18/727; C08L; C08L61/00; C08J2375/00; C08J2375/04; C08J2461/00; C08J2475/00; Y; Y10; Y10S; Y10S528/00; Y10S528/902
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A process for working up tolylene diisocyanate distillation residues into useable starting products for the production of plastics, wherein such distillation residue is a substantially monomer-free, crosslinked distillation residue which is insoluble in inert organic solvents and which cannot be melted without decomposing, of the type accumulating as slag in the removal of monomeric tolylene diisocyanates by distillation from the crude phosgenation product of tolylene diamines, comprising grinding said distillation residues to a mean particle size of less than 800 mμ.
Claim 2
Dependent Claim
81 words
A process for working up tolylene diisocyanate distillation residues into useable starting products for the production of plastics, wherein such distillation residue is a substantially monomer-free, crosslinked distillation residue which is insoluble in inert organic solvents and which cannot be melted without decomposing, of the type accumulating as slag in the removal of monomeric tolylene diisocyanates by distillation from the crude phosgenation product of tolylene diamines, comprising grinding said distillation residues to a mean particle size of less than 800 mμ.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1, wherein the residue is first quenched and denatured by stirring into water.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 1, wherein the residue is chemically modified at the same time and/or afterwards by reaction with compounds reactive to the functional groups of the distillation residue.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 1, wherein the residue is ground to a mean particle size of less than 100 mμ.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1, wherein the residue is ground to a mean particle size of less than 10 mμ.
Claim 7
Dependent Claim
12 words
A process as claimed in claim 1, wherein the residue is wet-ground.
Claim 8
Dependent Claim
35 words
A process as claimed in claim 1, wherein the residue is modified during and/or after grinding by reaction with water and/or ammonia and/or amine functional compounds in the gas phase or in the liquid phase.
Claim 9
Dependent Claim
26 words
A process as claimed in claim 1, wherein the residue is modified during and/or after grinding by reaction with compounds containing hydroxyl groups and/or carboxyl groups.
Claim 10
Dependent Claim
23 words
A process as claimed in claim 1, wherein the residue is modified with carbonyl compounds from the gas phase during and/or after grinding.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 1, wherein the residue is modified with carbonyl compounds from the liquid phase during and/or after grinding.
Claim 12
Dependent Claim
21 words
A process as claimed in claim 5, wherein unsaturated groups are introduced into the powdered slag residue by the modification reaction.
Claim 13
Dependent Claim
33 words
A process as claimed in claim 8, wherein the powdered slag residue modified with unsaturated groups is coated in another reaction step by the radically initiated polymerization of compounds containing olefinic double bonds.
Claim 14
Dependent Claim
29 words
A process as claimed in claim 1, wherein the free isocyanate groups still present in the finely ground residue are subjected to a catalytically initiated dimerization or trimerization reaction.
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |