US3674721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing flexible polyurethane foams and coatings
Assignee: Bayer Corp
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Filing: 1970-02-03
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Granted: 1972-07-04
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Expires: 1990-02-03
Abstract
Abstract Polyurethane foams and coatings. The foams are prepared from organic polyisocyanates, polyols and water in quasi-prepolymer, full prepolymer or one-shot systems using a substituted amidine catalyst. The coatings are conventional isocyanato-terminated polyurethane prepolymers cured with moisture in the presence of a substituted amidine.
Inventors
- 👤 Carl Albert Aufdermarsh Jr
- 👤 Adolf Wojciech Fogiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:00
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7614; C08G18/7628; C08G18/08; C08G18/10; C08G18/16; C08G18/18; C08G18/1858; C08G18/20; C08G18/73; C08G18/75
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
A process of claim 1 wherein the organic polyisocyanate is 4, 4''-methylenebis(cyclohexyl isocyanate) which is a liquid at 25* C.
Claim 2
Dependent Claim
20 words
A process of claim 1 wherein the polyol is a polyalkyleneether polyol having an average equivalent weight of about 900-2,000.
Claim 3
Dependent Claim
42 words
A process of claim 1 wherein x is at least about 2-5, the polyol is a polyester polyol having an average equivalent weight of about 900-1,500, about 40-90 percent by weight of which is added in step (1) to prepare the prepolymer.
Claim 4
Dependent Claim
24 words
A process of claim 1 wherein the water is emPloyed in the amount of about 2.5 parts by weight per 100 parts of polyol.
Claim 5
Dependent Claim
25 words
A process of claim 1 wherein the polyol is a polyalkyleneether polyol, substantially all of which is added in step (1) to prepare the prepolymer.
Claim 6
Dependent Claim
39 words
A process of claim 1 wherein the polyol has an average functionality of at least about 2.2 hydroxy groups per molecule, the polyisocyanate is 4,4''-methylenebis(cyclohexyl isocyanate) which is a liquid at about 25* C. and the catalyst is 1,5-diazabicyclo(4.3.0)nonene-5.
Claim 7
Dependent Claim
25 words
A process of claim 7 wherein the polyol is a polyalkyleneether polyol substantially all of which is added in step (1) to prepare the prepolymer.
Claim 8
Dependent Claim
78 words
A process for covering a substrate with a moisture-cure polyurethane coating which consists essentially of applying to said substrate a solution of an aliphatic isocyanato-terminated polyurethane prepolymer in an inert solvent in combination with about 0.05-2.0 percent by weight, based on the total weight of the coating composition, of amidine catalyst selected from the group consisting of 1,5-diazabicyclo- (4.3.0) nonene-5 and 1,8-diazabicyclo-(5.4.0) undecene-7 and thereafter curing the coating by allowing the isocyanato groups to react with atmospheric moisture.
Claim 9
Dependent Claim
44 words
A process of claim 2 wherein the isocyanato-terminated polyurethane prepolymer is prepared by mixing about 1.4-2.1 equivalents of an aliphatic polyisocyanate with about 1 equivalent of at least one polyol having a functionality of about 2-4 and an average equivalent weight of about 90-560.
Claim 10
Dependent Claim
26 words
A process of claim 10 wherein the polyol is a mixture of a polyalkyleneether polyol and a non-polymeric polyol having a molecular weight below about 350.
Claim 11
Dependent Claim
19 words
A process of claim 2 wherein the aliphatic polyisocyanate is 4,4''-methylenebis(cyclohexyl isocyanate) which is a liquid at 25* C.
Claim 12
Dependent Claim
11 words
A process of claim 2 wherein the substituted amidine is N''-cyclohexyl-N,N-dimethylformamidine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |