US4595709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of isocyanate polyaddition products
Assignee: Bayer AG
•
Filing: 1981-04-02
•
Granted: 1986-06-17
•
Expires: 2001-04-02
Abstract
Abstract Polyaddition products containing urethane groups are produced by reacting an isocyanate group containing distillation residue with a compound having a molecular weight less than 600 containing at least two alcoholic hydroxyl groups. The distillation residue is obtained in the commercial production of tolylene diisocyanate. The distillation residue and hydroxyl compound are reacted in amounts such that the NCO/OH equivalent ratio is less than 1.5:1. The polyaddition reaction is carried out at a temperature in the range of 50° to 220° C. The reaction is carried out in a reaction screw extruder preferably having self-cleaning screw geometry. The polyaddition products are useful as molding compositions, reactive fillers and starting materials in the production of flame-resistant polyurethane plastics.
Inventors
- 👤 Artur Reischl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/721; C08G18/727; C08G18/08; C08G18/0895; C08G18/10; C08G18/71; Y; Y10; Y10S; Y10S264/00; Y10S264/77; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
71 words
A process for the production of polyaddition products containing urethane groups in which an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate is reacted continuously with a compound having an average molecular weight of less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio less than 1.5:1 at a temperature in the range of 50° to 220° C. in a reaction extruder.
Claim 2
Dependent Claim
71 words
A process for the production of polyaddition products containing urethane groups in which an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate is reacted continuously with a compound having an average molecular weight of less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio less than 1.5:1 at a temperature in the range of 50° to 220° C. in a reaction extruder.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the reaction extruder is a multiple screw reaction extruder with self-cleaning properties having screws which rotate in the same direction.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein the distillation residue contains less than 12 wt. % monomeric tolylene diisocyanate, has a free NCO-group content of less than 35 wt. % and has a softening point below 200° C.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the alcoholic hydroxyl compound also contains ionic groups and/or groups capable of salt formation.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the distillation residue is substantially monomer free.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the distillation residue contains less than 27 wt. % free isocyanate groups.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the distillation residue has a softening point of from 50° to 160° C.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein the alcoholic hydroxyl compound is a glycol having a molecular weight of from 62 to 300.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the NCO/OH equivalent ratio is maintained within the range of 0.4:1 to 1:1.
Claim 11
Dependent Claim
28 words
The process of claim 1 wherein the tolylene diisocyanate distillation residue freshly accumulating as the sump phase of distillation is directly and continuously delivered into the reaction extruder.
Claim 12
Dependent Claim
60 words
A molding composition made by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50° to 220° C. in an extruder reactor.
Claim 13
Dependent Claim
60 words
A molding composition made by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50° to 220° C. in an extruder reactor.
Claim 14
Dependent Claim
19 words
The molding composition of claim 11 in which a material containing lignocellulose is also included in the reaction mixture.
Claim 15
Dependent Claim
73 words
A reactive filler useful in the production of plastics by polycondensation and polymerization reactions which is produced by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50° to 220° C. in a reaction extruder.
Claim 16
Dependent Claim
73 words
A reactive filler useful in the production of plastics by polycondensation and polymerization reactions which is produced by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50° to 220° C. in a reaction extruder.
Claim 17
Dependent Claim
79 words
A process for the production of a flame-resistant polyurethane plastic by the polyaddition of (a) a polyisocyanate; and (b) a reactive filler produced by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50° to 220° C. in a reaction extruder.
Claim 18
Dependent Claim
79 words
A process for the production of a flame-resistant polyurethane plastic by the polyaddition of (a) a polyisocyanate; and (b) a reactive filler produced by continuously reacting an isocyanate-group-containing distillation residue obtained in the commercial production of tolylene diisocyanate with a compound having a molecular weight less than 600 and containing at least two alcoholic hydroxyl groups in an NCO/OH equivalent ratio of less than 1.5:1 at temperatures in the range of 50° to 220° C. in a reaction extruder.
Claim 19
Dependent Claim
18 words
The process of claim 14 wherein a compound containing isocyanate-reactive groups is also used as a polyaddition reactant.
Claim 20
Dependent Claim
29 words
The process of claim 15 wherein a compound taken from the group consisting of activators, blowing agents, fillers, additives and mixtures thereof is also used as a polyaddition reactant.
References Cited (Backward Citations)
DE895058C
Cited
US3180852A
Cited
US3897314A
Cited
GB1508317A
Cited
US4143008A
Cited
US4251638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |