US4258141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of flexible polyurethane foams with cyanic acid derivatives
Assignee: BASF SE
•
Filing: 1979-04-10
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Granted: 1981-03-24
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Expires: 1999-04-10
Abstract
Abstract The invention concerns a process for the manufacture of flame resistant flexible polyurethane foams by reacting a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates having a functionality greater than 2 containing 40 to 90 percent by weight diphenylmethane diisocyanate based on the total weight of said mixture; polyols, cyanic acid derivatives such as cyanamide, dicyandiamide, guanidine, biguanidine, melamine, cyanuric alkyl esterhydrazides and -amides as flame inhibitors, and blowing agents; as well as, possibly, chain extenders and other additives. The flexible polyurethane foams are suited for the familiar areas of applications, but especially as sound-insulation material for the construction industry.
Inventors
- 👤 Wolfgang Jarre
- 👤 Gerhard Mueller
- 👤 Otmar Zipp
- 👤 Eckhard Ropte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:37
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3838; C08G18/3842; C08G18/3851; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08K; C08K5/00; C08K5/16; C08K5/29; C08K5/34; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
114 words
A process for the manufacture of flame-resistant flexible polyurethane foams by a reaction of aromatic polyisocyanates, polyols, flame inhibitors, and blowing agents as well as optionally, chain extenders and additives, wherein a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 40 to 90 percent by weight diphenylmethane diisocyanates based on the total weight of said mixture is used as aromatic polyisocyanate, and that a cyanic acid derivative selected from the group consisting of cyanamide, dicyandiamide, guanidine, biguanidine, cyanoguanidine, guanidine carbonate, cyanuric acid alkyl ester having 1 to 10 carbon atoms in the alkyl radical, cyanuric acid hydrazide, and melamine is used as the flame inhibitor, and water is used as the blowing agent.
Claim 2
Dependent Claim
114 words
A process for the manufacture of flame-resistant flexible polyurethane foams by a reaction of aromatic polyisocyanates, polyols, flame inhibitors, and blowing agents as well as optionally, chain extenders and additives, wherein a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 40 to 90 percent by weight diphenylmethane diisocyanates based on the total weight of said mixture is used as aromatic polyisocyanate, and that a cyanic acid derivative selected from the group consisting of cyanamide, dicyandiamide, guanidine, biguanidine, cyanoguanidine, guanidine carbonate, cyanuric acid alkyl ester having 1 to 10 carbon atoms in the alkyl radical, cyanuric acid hydrazide, and melamine is used as the flame inhibitor, and water is used as the blowing agent.
Claim 3
Dependent Claim
34 words
The process according to claim 1, wherein the mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates contains 45 to 65 percent by weight of diphenylmethane diisocyanates based on the total weight of said mixture.
Claim 4
Dependent Claim
33 words
The process according to claim 1, wherein the mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates contains less than 10 percent of 2,4'-diphenylmethane diisocyanate based on the weight of the diphenylmethane diisocyanate isomers.
Claim 5
Dependent Claim
33 words
The process according to claim 1, wherein the mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates contains less than 10 percent of 2,4'-diphenylmethane diisocyanate based on the weight of the diphenylmethane diisocyanate isomers.
Claim 6
Dependent Claim
14 words
The process according to claim 1, wherein melamine is used as the flame inhibitor.
Claim 7
Dependent Claim
26 words
The process according to claim 5, wherein melamine is used in a quantity of 10 to 70 percent by weight based on the amount of polyisocyanate.
Claim 8
Dependent Claim
30 words
The process according to claim 1, wherein water, in a quantity of 2 to 5 percent by weight based on the amount of polyol used, is used as blowing agent.
Claim 9
Dependent Claim
32 words
The process according to claim 7, wherein water is used in the form of a mixture with blowing agents selected from the group consisting of low-boiling hydrocarbons, ether, and low-boiling halogenated hydrocarbons.
Claim 10
Dependent Claim
104 words
Flexible polyurethane foams prepared by the reaction of aromatic polyisocyanates, polyols, flame inhibitors, blowing agents and optionally chain extenders and additives, wherein a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 40 to 90 percent by weight diphenylmethane diisocyanates based on the total weight of said mixture is used as the aromatic polyisocyanate, and that a cyanic acid derivative selected from the group consisting of cyanamide, dicyandiamide, guanidine, biguanidine, cyanoguanidine, guanidine carbonate, cyanuric acid alkyl ester having 1 to 10 atoms in the alkyl radical, cyanuric hydrazide, and melamine is used as the flame inhibitor and water is used as the blowing agent.
Claim 11
Dependent Claim
104 words
Flexible polyurethane foams prepared by the reaction of aromatic polyisocyanates, polyols, flame inhibitors, blowing agents and optionally chain extenders and additives, wherein a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 40 to 90 percent by weight diphenylmethane diisocyanates based on the total weight of said mixture is used as the aromatic polyisocyanate, and that a cyanic acid derivative selected from the group consisting of cyanamide, dicyandiamide, guanidine, biguanidine, cyanoguanidine, guanidine carbonate, cyanuric acid alkyl ester having 1 to 10 atoms in the alkyl radical, cyanuric hydrazide, and melamine is used as the flame inhibitor and water is used as the blowing agent.
Claim 12
Dependent Claim
35 words
The flexible polyurethane foam of claim 9 wherein the mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates contains 45 to 65 percent by weight of diphenylmethane diisocyanates based on the total weight of said mixture.
Claim 13
Dependent Claim
34 words
The flexible polyurethane foam of claim 10 wherein the mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates contains less than 10 percent of 2,4'-diphenylmethane diisocyanate based on the weight of the diphenylmethane diisocyanate isomers.
Claim 14
Dependent Claim
34 words
The flexible polyurethane foams of claim 9 wherein the mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates contains less than 10 percent of 2,4'-diphenylmethane diisocyanate based on the weight of the diphenylmethane diisocyanate isomers.
Claim 15
Dependent Claim
15 words
The flexible polyurethane foam of claim 9 wherein melamine is used as the flame inhibitor.
Claim 16
Dependent Claim
27 words
The flexible polyurethane foam of claim 13 wherein melamine is used in a quantity of 10 to 70 percent by weight based on the amount of polyisocyanate.
Claim 17
Dependent Claim
31 words
The flexible polyurethane foam of claim 13 wherein water, in a quantity of 2 to 5 percent by weight based on the amount of polyol used, is used as blowing agent.
Claim 18
Dependent Claim
33 words
The flexible polyurethane foam of claim 15 wherein water is used in the form of a mixture with blowing agents selected from the group consisting of low-boiling hydrocarbons, ether, and low-boiling halogenated hydrocarbons.
References Cited (Backward Citations)
GB874430A
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US3833525A
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US4075137A
Cited
GB1417087A
Cited
US3897372A
Cited
US4139501A
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |