Patent US392394A successfully refreshed from Google Patents.
Patent US4456709A successfully refreshed from Google Patents.
US4456709A
Expired / Lapsed
US
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Polyisocyanate mixtures, process for their production and their use in the production of polyurethane plastics
Assignee: Bayer AG
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Filing: 1983-11-23
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Granted: 1984-06-26
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Expires: 2003-11-23
Abstract
Abstract The present invention is directed to polyisocyanate mixtures which are liquid and stable in storage at room temperature and which have an NCO-content of from 36.5 to 45% by weight, consisting essentially of a mixture of from 25 to 70 parts by weight of partly trimerized 2,4-diisocyanatotoluene with from 30 to 75 parts by weight of unmodified 2,4-and/or 2,6-diisocyanatotoluene, a process for the production of these mixtures by mixing the individual components and the use of the mixtures as a synthesis component in the production of polyurethane plastics by the isocyanate-polyaddition process.
Inventors
- 👤 Roland Richter
- 👤 Hans Hettel
- 👤 Hanns P. Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:52
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/721; C08G18/725; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/26; C07D251/30; C07D251/34; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/794; C08G2110/00; C08G2110/0008; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A polyisocyanate mixture which is liquid and storable at room temperature and which has an isocyanate content of from 36.5 to 45% by weight, consisting essentially of (a) from 25 to 70 parts by weight of a mixture having an NCO-content of from 22 to 36% by weight of (i) isocyanurate-group-containing trimers of 2,4-diisocyanatotoluene and (ii) 2,4-diisocyanatotoluene and (b) from 30 to 75 parts by weight of 2,4- and/or 2,6-diisocyanatotoluene.
Claim 2
Dependent Claim
70 words
A polyisocyanate mixture which is liquid and storable at room temperature and which has an isocyanate content of from 36.5 to 45% by weight, consisting essentially of (a) from 25 to 70 parts by weight of a mixture having an NCO-content of from 22 to 36% by weight of (i) isocyanurate-group-containing trimers of 2,4-diisocyanatotoluene and (ii) 2,4-diisocyanatotoluene and (b) from 30 to 75 parts by weight of 2,4- and/or 2,6-diisocyanatotoluene.
Claim 3
Dependent Claim
28 words
The polyisocyanate mixture of claim 1, characterized in that it contains less than 0.5% by weight of compounds containing active hydrogen atoms attached to nitrogen, expressed as --NH--.
Claim 4
Dependent Claim
34 words
The polyisocyanate mixture of claim 1 wherein said mixture having an NCO-content of from 22 to 36% by weight is produced by trimerizing 2,4-diisocyanatotoluene to a degree of trimerization of about 25 to 55%.
Claim 5
Dependent Claim
93 words
A process for producing a polyisocyanate mixture which is liquid and storable at room temperature comprising mixing (a) from 25 to 70 parts by weight of a partly trimerized 2,4-diisocyanatotoluene with an NCO-content of from 22 to 36% by weight which has been produced by trimerizing some of the isocyanate groups in 2,4-diisocyanatotoluene in the presence of a trimerization catalyst, with (b) from 30 to 75 parts by weight of 2,4- and/or 2,6-diisocyanato-toluene in such a way that a polyisocyanate mixture having an NCO-content of from 36.5 to 45% by weight is obtained.
Claim 6
Dependent Claim
93 words
A process for producing a polyisocyanate mixture which is liquid and storable at room temperature comprising mixing (a) from 25 to 70 parts by weight of a partly trimerized 2,4-diisocyanatotoluene with an NCO-content of from 22 to 36% by weight which has been produced by trimerizing some of the isocyanate groups in 2,4-diisocyanatotoluene in the presence of a trimerization catalyst, with (b) from 30 to 75 parts by weight of 2,4- and/or 2,6-diisocyanato-toluene in such a way that a polyisocyanate mixture having an NCO-content of from 36.5 to 45% by weight is obtained.
Claim 7
Dependent Claim
24 words
The process of claim 4, characterized in that potassium acetate complexed with open-chain or cyclic polyethylene oxide polyethers is used as the trimerization catalyst.
Claim 8
Dependent Claim
70 words
In a method of manufacturing a polyurethane and/or polyurea product by reacting an isocyanate with an active hydrogen containing material, the improvement wherein the isocyanate used is (a) from 25 to 70 parts by weight of a mixture having an NCO-content of from 22 to 36% by weight of (i) isocyanurate-group-containing trimers of 2,4-diisocyanatotoluene and (ii) 2,4-diisocyanatotoluene and (b) from 30 to 75 parts by weight of 2,4- and/or 2,6-diisocyanatotoluene.
Claim 9
Dependent Claim
70 words
In a method of manufacturing a polyurethane and/or polyurea product by reacting an isocyanate with an active hydrogen containing material, the improvement wherein the isocyanate used is (a) from 25 to 70 parts by weight of a mixture having an NCO-content of from 22 to 36% by weight of (i) isocyanurate-group-containing trimers of 2,4-diisocyanatotoluene and (ii) 2,4-diisocyanatotoluene and (b) from 30 to 75 parts by weight of 2,4- and/or 2,6-diisocyanatotoluene.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |