US4661533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid polyurethane modified polyisocyanurate containing fly ash as an inorganic filler
Assignee: Dow Chemical Co
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Filing: 1985-10-28
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Granted: 1987-04-28
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Expires: 2005-10-28
Abstract
Abstract This invention is a closed cell, rigid polyurethane-modified polyisocyanurate foam containing from about 10 to about 80 percent by weight of the foam of fly ash, which polyurethane-modified polyisocyanurate foam is prepared from a polyurethane-modified polyisocyanurate foam-forming composition which, when foamed to a density of about 1.75 pounds per cubic foot in the absence of the fly ash, forms a foam having a compressive modulus of about 150 to 325 pounds per square inch.
Inventors
- 👤 William G. Stobby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08K; C08K3/00; C08K3/01; C08K3/013; C08K3/18; C08K3/20; C08K3/22; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S521/906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A closed cell, rigid, polyurethane-modified polyisocyanurate foam containing from about 10 to about 80 percent by weight of the foam of fly ash, which polyurethane-modified polyisocyanurate foam is prepared from a polyurethane-modified polyisocyanurate foam-forming composition which when foamed to a density of about 1.75 pounds per cubic foot in the absence of the fly ash, forms a foam having a compressive modulus of about 150 to 325 pounds per square inch.
Claim 2
Dependent Claim
71 words
A closed cell, rigid, polyurethane-modified polyisocyanurate foam containing from about 10 to about 80 percent by weight of the foam of fly ash, which polyurethane-modified polyisocyanurate foam is prepared from a polyurethane-modified polyisocyanurate foam-forming composition which when foamed to a density of about 1.75 pounds per cubic foot in the absence of the fly ash, forms a foam having a compressive modulus of about 150 to 325 pounds per square inch.
Claim 3
Dependent Claim
27 words
The polyurethane-modified polyisocyanurate foam of claim 1 wherein said foam-forming composition comprises an organic polyisocyanate, an organic isocyanate-reactive compound, a blowing agent and an isocyanate trimerization catalyst.
Claim 4
Dependent Claim
23 words
The polyurethane-modified polyisocyanurate foam of claim 2 wherein said organic isocyanate-reactive compound has an average equivalent weight of about 100 to about 500.
Claim 5
Dependent Claim
20 words
The polyurethane-modified polyisocyanurate foam of claim 3 wherein said organic isocyanate-reactive compound is a polyether polyol or a polyester polyol.
Claim 6
Dependent Claim
18 words
The polyurethane-modified polyisocyanurate foam of claim 4 wherein said foam-forming composition has an isocyanate index of about 200-500.
Claim 7
Dependent Claim
17 words
The polyurethane-modified polyisocyanurate foam of claim 5 wherein said blowing agent comprises a low boiling halogenated alkane.
Claim 8
Dependent Claim
18 words
The polyurethane-modified polyisocyanurate foam of claim 6 wherein said polyisocyanate comprises 2,4- and/or 2,6-toluenediisocyanate or 2,4'- and/or 4,4'-diphenylmethanediisocyanate.
Claim 9
Dependent Claim
14 words
The polyurethane-modified polyisocyanurate foam of claim 1 which has fewer than 10% open cells.
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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |