US4410641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiocyanurate-polyurethane foams
Assignee: BASF Corp
•
Filing: 1982-01-04
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Granted: 1983-10-18
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Expires: 2002-01-04
Abstract
Abstract Polyisocyanurate-polyurethane foams are prepared by reacting an organic polyisocyanate with oxyethylated aromatic amines and diols having equivalent weights from 31 to 100 and at an isocyanate index of 150 to 500 in the presence of a trimerization catalyst and a blowing agent.
Inventors
- 👤 Thirumurti Narayan
- 👤 Theodore O. Stolz
- 👤 John T. Patton, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G2101/00; C08G2110/00; C08G2110/0041; C08G2110/005; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A process for the preparation of polyisocyanurate-polyurethane foams comprising reacting an organic polyisocyanate with a polyol at an isocyanate index of 150 to 470 in the presence of a blowing agent and an effective amount of a trimerization catalyst, the improvement comprising employing as the polyol component oxyethylated toluene diamine and diethylene glycol.
Claim 2
Dependent Claim
53 words
A process for the preparation of polyisocyanurate-polyurethane foams comprising reacting an organic polyisocyanate with a polyol at an isocyanate index of 150 to 470 in the presence of a blowing agent and an effective amount of a trimerization catalyst, the improvement comprising employing as the polyol component oxyethylated toluene diamine and diethylene glycol.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the ratio of said oxyethylated toluene diamine to said diethylene glycol in the polyol component is from 1:1 to 3:1.
Claim 4
Dependent Claim
10 words
The product as prepared by the process of claim 1.
References Cited (Backward Citations)
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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) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |