Patent EP0254568A2 successfully refreshed from Google Patents.
US4094828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid polyurethane foams
Assignee: Dow Chemical Co
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Filing: 1976-09-30
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Granted: 1978-06-13
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Expires: 1996-09-30
Abstract
Abstract Covers rigid polyurethane foams possessing unusual dimensional stability and heat distortion properties. Said foams are obtained by reacting in the presence of a blowing agent and a catalyst of polyurethane formation, an organic polyisocyanate and a polyol combination comprising 5-85 percent by weight of a copolymer of allyl alcohol and styrene and 15-95 percent by weight of a polyether polyol having a hydroxyl number ranging from about 200 to about 800, said weight percentages being based on the total weight of said polyol combination.
Inventors
- 👤 Howard P. Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4063; C08G18/62; C08G18/6212; C08G2110/00; C08G2110/0025
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
73 words
A rigid polyurethane foam obtained by reacting in the presence of a blowing agent and a catalyst of polyurethane formation, an organic polyisocyanate and a polyol combination comprising 5-85 percent by weight of a copolymer of allyl alcohol and styrene and 15-95 percent by weight of a polyether polyol having a hydroxyl number ranging from about 200 to about 800, said weight percentages being based on the total weight of said polyol combination.
Claim 2
Dependent Claim
73 words
A rigid polyurethane foam obtained by reacting in the presence of a blowing agent and a catalyst of polyurethane formation, an organic polyisocyanate and a polyol combination comprising 5-85 percent by weight of a copolymer of allyl alcohol and styrene and 15-95 percent by weight of a polyether polyol having a hydroxyl number ranging from about 200 to about 800, said weight percentages being based on the total weight of said polyol combination.
Claim 3
Dependent Claim
22 words
The rigid polyurethane foam of claim 1 wherein said polyol combination has a hydroxyl number ranging from about 300 to about 700.
Claim 4
Dependent Claim
22 words
The rigid polyurethane foam of claim 2 wherein said polyol combination has a hydroxyl number ranging from about 400 to about 600.
Claim 5
Dependent Claim
27 words
The rigid polyurethane foam of claim 1 wherein said copolymer comprises 10-90 weight percent each of allyl alcohol and styrene based on the weight of said copolymer.
Claim 6
Dependent Claim
25 words
The rigid polyurethane foam of claim 4 wherein said copolymer comprises 40-80 percent by weight of allyl alcohol and 20-60 percent by weight of styrene.
Claim 7
Dependent Claim
33 words
The rigid polyurethane foam of claim 1 wherein said polyether polyol is the reaction product of a polyfunctional active hydrogen initiator and propylene oxide, ethylene oxide or mixed propylene oxide and ethylene oxide.
Claim 8
Dependent Claim
15 words
The rigid polyurethane foam of claim 6 wherein said initiator has a functionality of 2-6.
Claim 9
Dependent Claim
35 words
The rigid polyurethane foam of claim 7 wherein said polyfunctional active hydrogen initiator is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, glycerine, sorbitol, and trimethylolpropane.
Claim 10
Dependent Claim
20 words
The rigid polyurethane foam of claim 6 wherein said polyether polyol is the reaction product of propylene oxide and triethanolamine.
Claim 11
Dependent Claim
26 words
The rigid polyurethane foam of claim 1 wherein said polyol combination comprises 40-80 weight percent of said polyether polyol and 20-60 weight percent of said copolymer.
Claim 12
Independent Claim
77 words
A method for producing a rigid polyurethane foam which comprises reacting in the presence of a blowing agent and a catalyst of polyurethane formation, an organic polyisocyanate and a polyol combination comprising 5-85 percent by weight of a copolymer of allyl alcohol and styrene and 15-95 percent by weight of a polyether polyol having a hydroxyl number ranging from about 200 to about 800, said weight percentages being based on the total weight of said polyol combination.
Claim 13
Independent Claim
77 words
A method for producing a rigid polyurethane foam which comprises reacting in the presence of a blowing agent and a catalyst of polyurethane formation, an organic polyisocyanate and a polyol combination comprising 5-85 percent by weight of a copolymer of allyl alcohol and styrene and 15-95 percent by weight of a polyether polyol having a hydroxyl number ranging from about 200 to about 800, said weight percentages being based on the total weight of said polyol combination.
Claim 14
Dependent Claim
36 words
The method of claim 11 wherein said organic polyisocyanate is employed in an amount sufficient to provide 1.05 to 1.5 mol equivalents to isocyanato groups per mole equivalent of hydroxyl groups present in said polyol combination.
Claim 15
Dependent Claim
31 words
The method of claim 11 wherein said polyether polyol is the reaction product of a polyfunctional active hydrogen initiator and propylene oxide, ethylene oxide, or mixed propylene oxide and ethylene oxide.
Claim 16
Dependent Claim
16 words
The method of claim 11 wherein said polyfunctional active hydrogen initiator has a functionality of 2-6.
Claim 17
Dependent Claim
30 words
The method of claim 11 wherein polyfunctional active hydrogen initiator is selected from the group consisting of monoethanolamine, diethanolamine, triethanolamine, ethylene glycol, propylene glycol, polypropylene glycol, glycerine, sorbitol, and trimethylolpropane.
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) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |