Patent US4251638A successfully refreshed from Google Patents.
US4251638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyurethane plastics
Assignee: Bayer AG
•
Filing: 1979-10-29
•
Granted: 1981-02-17
•
Expires: 1999-10-29
Abstract
Abstract This invention relates to a process for the production of optionally cellular polyurethane plastics using a reactive filler obtained by finely grinding a distillation residue of the type accumulating in the commercial production of tolylene diisocyanate. It is possible in this way to recycle the previously unuseable slag-like residues and at the same time to improve the mechanical properties of the polyurethane plastics filled with them.
Inventors
- 👤 Artur Reischl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/28; C08G18/40; C08G18/64; C08G18/6484; C08G18/70; C08G18/72; C08G18/721; C08G18/727
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A process for the production of optionally cellular polyurethane plastics by the polyaddition of (A) polyisocyanates and, optionally, (B) low molecular weight and/or relatively high molecular weight compounds containing isocyanate-reactive hydrogen atoms, in the presence of (C) organic fillers and, optionally, (D) blowing agents, catalysts and other known additives, wherein the improvement comprises component (C) being a crosslinked distillation residue which is insoluble in inert organic solvents and which cannot be melted without decomposing, and which contains less than 15% free isocyanate groups, of the type accumulating as slag in the distillation of monomeric tolylene diisocyanates from the crude phosgenation products of tolylene diamines and which have been size-reduced to a mean particle size of less than 800 mμ.
Claim 2
Dependent Claim
119 words
A process for the production of optionally cellular polyurethane plastics by the polyaddition of (A) polyisocyanates and, optionally, (B) low molecular weight and/or relatively high molecular weight compounds containing isocyanate-reactive hydrogen atoms, in the presence of (C) organic fillers and, optionally, (D) blowing agents, catalysts and other known additives, wherein the improvement comprises component (C) being a crosslinked distillation residue which is insoluble in inert organic solvents and which cannot be melted without decomposing, and which contains less than 15% free isocyanate groups, of the type accumulating as slag in the distillation of monomeric tolylene diisocyanates from the crude phosgenation products of tolylene diamines and which have been size-reduced 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
19 words
A process as claimed in claim 1, wherein component (C) has a particle size of less than 350 mμ.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein component (C) has a particle size of less than 10 mμ.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1, wherein component (C) has first been chemically modified by reaction with compounds reactive to isocyanate groups.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 5, wherein the compounds reactive to isocyanate groups used are carbonyl compounds and/or carbodiimide groups.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 5, wherein unsaturated and/or ionic groups or groups capable of salt formation have been introduced into component (C) by a chemical modification reaction.
Claim 9
Dependent Claim
32 words
A process as claimed in claim 1, wherein component (C) is used in a quantity of from 2% to 50% by weight, based on the sum of components A, B and C.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 1, wherein powdered azulmic acids are used as an additional organic filler.
References Cited (Backward Citations)
US3455836A
Cited
US3634361A
Cited
US3897314A
Cited
GB1346402A
Cited
US4071505A
Cited
DE2333150A1
Cited
US4000099A
Cited
US3935132A
Cited
US4143008A
Cited
US4049590A
Cited
US4096101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |