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US3969288A
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Carbodiimide-isocyanurate foams prepared from acid-modified toluene diisocyanate
Assignee: BASF Corp
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Filing: 1974-10-02
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Granted: 1976-07-13
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Expires: 1994-10-02
Abstract
Abstract Acid-modified toluene diisocyanate is used to prepare rigid cellular foams characterized by carbodiimide linkages either by a one-shot process or a quasi-prepolymer process. The use of acid-modified toluene diisocyanate exhibits a more controllable reactivity with a one-shot foaming process and more stable quasi-prepolymers when using such systems.
Inventors
- 👤 Moses Cenker
- 👤 Peter T. Kan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; C08G18/02; C08G18/025; C08G18/08; C08G18/089; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2115/00; C08G2115/06; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
In a process for the preparation of a rigid cellular foam characterized by carbodiimide linkages wherein an organic polyisocyanate is catalytically condensed in the presence of a catalytically sufficient amount of a carbodiimide catalyst, the improvement which comprises: employing as the organic polyisocyanate commercial pure toluene diisocyanate which has been acid-modified by adding an excess amount of a conventional acidifying agent to achieve an acidity level of a minimum of about ten times the acidity level of the commercial pure toluene diisocyanate.
Claim 2
Dependent Claim
82 words
In a process for the preparation of a rigid cellular foam characterized by carbodiimide linkages wherein an organic polyisocyanate is catalytically condensed in the presence of a catalytically sufficient amount of a carbodiimide catalyst, the improvement which comprises: employing as the organic polyisocyanate commercial pure toluene diisocyanate which has been acid-modified by adding an excess amount of a conventional acidifying agent to achieve an acidity level of a minimum of about ten times the acidity level of the commercial pure toluene diisocyanate.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the toluene diisocyanate is employed as an isocyanate-terminated quasi-prepolymer to prepare therefrom a urethane-modified rigid cellular foam characterized by carbodiimide linkages.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein the toluene diisocyanate is used alone or in admixture with another organic polyisocyanate, the admixture containing a major amount of the toluene diisocyanate.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein the toluene diisocyanate contains from about 0.02% to about 0.5%, by weight, based on the weight of the polyisocyanate, of the acidifying agent.
Claim 6
Dependent Claim
21 words
The process of claim 4 wherein the acidifying agent is selected from the group consisting of hydrogen chloride and benzoyl chloride.
Claim 7
Dependent Claim
29 words
The process of claim 1 wherein the toluene diisocyanate is employed in admixture with an active hydrogen-containing compound to provide a urethane-modified rigid cellular foam characterized by carbodiimide linkages.
Claim 8
Dependent Claim
30 words
The process of claim 6 wherein the admixture is catalytically condensed in the presence of a catalytic system comprising a carbodiimide catalyst, an isocyanate trimerization catalyst and a urethane catalyst.
Claim 9
Dependent Claim
50 words
A storage stable isocyanate-terminated quasi-prepolymer for use in the process of claim 1 consisting essentially of: a. an excess amount of the acid-modified commercial pure toluene diisocyanate as defined in claim 1, and b. an active hydrogen-containing compound consisting essentially of a phenol, formaldehyde, diethanolamine, and propylene oxide derived triol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |