US3960788A
Expired / Lapsed
US
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Modified isocyanate foams
Assignee: Dow Chemical Co
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Filing: 1974-09-23
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Granted: 1976-06-01
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Expires: 1994-09-23
Abstract
Abstract Modified isocyanurate foams having excellent thermal stability, low friability, adhesion, cell structure and the like are disclosed. The novel foams are obtained by the polymerization of a mixture of methylene-bridged polyphenylpolyisocyanates having an average functionality of about 2.1-2.4 consisting essentially of from about 60% to about 75% by weight methylene diphenylisocyanate having an isomer content consisting essentially of about 60 to about 80% 4,4'-isomer, about 18% to about 33% 2,4'-isomer, and about 2% to about 7% 2,2'-isomer by weight of the methylene diphenylisocyanate, and about 25% to about 40% by weight higher functionality methylene-bridged polyphenyl-polyisocyanates, in the presence of an isocyanurate group formation catalyst, a blowing agent and a polyether or polyester polyol. The novel foams are useful for preparing rigid components exposed to high temperatures and can be formulated to be fire resistant.
Inventors
- 👤 Michael Cuscurida
- 👤 Thomas Howard Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S521/906
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A modified cellular isocyanurate comprised of the reaction product, formed by bringing together in the presence of an inert blowing agent and an isocyanurate group formation catalyst, of: a. a mixture of methylene-bridged polyphenylpolyisocyanates having an average functionality of about 2.1 to about 2.4 consisting essentially of from about 60% to about 75% by weight methylene diphenylisocyanate and from about 40% to about 25% by weight higher functionality methylene-bridged polyphenylpolyisocyanates, said methylene diphenylisocyanate having an isomer content consisting essentially of about 60% to about 80% by weight 4,4'-, about 18% to about 33% by weight 2,4'-, and about 2% to about 7% by weight 2,2'-isomers based on the total weight of said methylene diphenylisocyanate, and b. about 0.1 to about 0.5 equivalents, per equivalent of said methylene-bridged polyphenylpolyisocyanate mixture, of a polyether or polyester polyol having a hydroxyl number of from about 100 to about 500 and a molecular weight of about 100 to about 1,000.
Claim 2
Dependent Claim
156 words
A modified cellular isocyanurate comprised of the reaction product, formed by bringing together in the presence of an inert blowing agent and an isocyanurate group formation catalyst, of: a. a mixture of methylene-bridged polyphenylpolyisocyanates having an average functionality of about 2.1 to about 2.4 consisting essentially of from about 60% to about 75% by weight methylene diphenylisocyanate and from about 40% to about 25% by weight higher functionality methylene-bridged polyphenylpolyisocyanates, said methylene diphenylisocyanate having an isomer content consisting essentially of about 60% to about 80% by weight 4,4'-, about 18% to about 33% by weight 2,4'-, and about 2% to about 7% by weight 2,2'-isomers based on the total weight of said methylene diphenylisocyanate, and b. about 0.1 to about 0.5 equivalents, per equivalent of said methylene-bridged polyphenylpolyisocyanate mixture, of a polyether or polyester polyol having a hydroxyl number of from about 100 to about 500 and a molecular weight of about 100 to about 1,000.
Claim 3
Dependent Claim
59 words
The modified cellular isocyanurate of claim 1 wherein said mixture of polymethylene-bridged polyphenylpolyisocyanates contains about 67 wt. % methylene diphenylisocyanate having an isomer content of about 74 wt. % 4,4'-, about 22 wt. % 2,4'-, and about 4 wt. % 2,2'-isomers, based on the total weight of said methylene diphenylisocyanate, and about 33 wt. % higher functionality methylene-bridged polyphenylpolyisocyanates.
Claim 4
Dependent Claim
36 words
The modified cellular isocyanurate of claim 1 wherein said isocyanurate group formation catalyst is present in an amount of from about 0.03% to about 5.0%, by weight, based upon the total weight of said reaction product.
Claim 5
Dependent Claim
34 words
The modified cellular isocyanurate of claim 1 wherein from about 0.1 to about 0.5 equivalents of a polyether polyol is present, said polyether polyol having a molecular weight of about 100 to about 1,000.
Claim 6
Dependent Claim
34 words
The modified cellular isocyanurate of claim 1 wherein said reaction product includes from about zero to about 20%, by weight, of a compatible fire retardant, based upon the total weight of said reaction product.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |