US4293456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of polyurethane plastics
Assignee: Bayer AG
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Filing: 1980-09-09
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Granted: 1981-10-06
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Expires: 2000-09-09
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
2026-10-24 23:02
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: 5
Claim 1
Independent Claim
97 words
A process for the production of boards and moldings by hot-pressing starting materials containing ligno-cellulose with liquid polyisocyanates as binders, wherein, the improvement comprises a substantially monomerfree, 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 distillation of monomeric tolylene diisocyanates from the cruede phosgenation products of tolylene diamines and which has been size reduced to a mean particle size of less than 800 mμ being used as an additional binder in a quantity of from 2% to 60% by weight.
Claim 2
Dependent Claim
97 words
A process for the production of boards and moldings by hot-pressing starting materials containing ligno-cellulose with liquid polyisocyanates as binders, wherein, the improvement comprises a substantially monomerfree, 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 distillation of monomeric tolylene diisocyanates from the cruede phosgenation products of tolylene diamines and which has been size reduced to a mean particle size of less than 800 mμ being used as an additional binder in a quantity of from 2% to 60% by weight.
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
23 words
A process as claimed in claim 1, wherein the residue has first been chemically modified by reaction with compounds reactive to isocyanate groups.
Claim 5
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)
US4100328A
Cited
US4209433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |