CA1129599A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Manufacture of flexible foams
Assignee: BASF SE
•
Filing: 1979-04-10
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Granted: 1982-08-10
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Expires: 1999-04-10
Abstract
Abstract MANUFACTURE OF FLEXIBLE FOAMS Abstract of the Invention This invention concerns a process for the manu-facture of flexible polyurethane foams from urethane-modified aromatic polyisocyanates having an NCO content of 15 to 30 percent by weight and a viscosity of 100 to 2000 centipoises at 20°C, which are obtained by reaction of a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 55 to 85 percent by weight of diphenylmethane diisocyanate based on the total weight of the polyisocyanate mixture and a hydroxyl compound with 2 to 4 Zerewitinoff active hydrogen atoms and a molecular weight of 60 to 1500, in an equivalency ratio of NCO groups to active hydrogen atoms of the hydroxyl compound of 2:1 to 60:1, polyols, catalysts, blowing agents, and optionally, chain extenders, auxiliaries, and additives.
Inventors
- 👤 Wolfgang Jarre
- 👤 Herbert Stutz
- 👤 Ernst Schoen
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-02 07:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8035; C08G18/8041
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
In a process for the manufacture of flexible polyorethane foams by carrying out a foaming reaction using a reaction mixture comprising organic polyisocyanates, polyols, catalysts, foaming agent and optionally, chain extenders, auxiliaries and additives, the improvement wherein: said organic polyisocyanate has a NCO content of 15 to 30 percent by weight and a viscosity of 100 to 2000 centipoises at 20°C.; said organic polyisocyanate is a mixture of diphenyl-methane diisocyanates and polyphenylene polymethylene poly-isocyanates containing 55 to 85 percent by weight of diphenyl-methane diisocyanate based on the total weight of the poly-isocyanate mixturel and said organic polyisocyanate mixture has been reacted with a hydroxyl compound having 2 to 3 Zerewitinoff active hydrogen atoms and a molecular weight of 60 to 1000 in an equivalency ratio of NCO group to active hydrogen atom of said hydroxyl compound of 2:1 to 60:1 prior to the reaction with other said polyols.
Claim 2
Dependent Claim
148 words
In a process for the manufacture of flexible polyorethane foams by carrying out a foaming reaction using a reaction mixture comprising organic polyisocyanates, polyols, catalysts, foaming agent and optionally, chain extenders, auxiliaries and additives, the improvement wherein: said organic polyisocyanate has a NCO content of 15 to 30 percent by weight and a viscosity of 100 to 2000 centipoises at 20°C.; said organic polyisocyanate is a mixture of diphenyl-methane diisocyanates and polyphenylene polymethylene poly-isocyanates containing 55 to 85 percent by weight of diphenyl-methane diisocyanate based on the total weight of the poly-isocyanate mixturel and said organic polyisocyanate mixture has been reacted with a hydroxyl compound having 2 to 3 Zerewitinoff active hydrogen atoms and a molecular weight of 60 to 1000 in an equivalency ratio of NCO group to active hydrogen atom of said hydroxyl compound of 2:1 to 60:1 prior to the reaction with other said polyols.
Claim 3
Dependent Claim
35 words
The process according to claim 1 wherein said organic polyisocyanate is reacted with said hydroxyl compound in an equivalency ratio of NCO group to active hydrogen atoms of said hydroxyl compound of 5:1 to 50:1.
Claim 4
Dependent Claim
18 words
The process according to claim 1 wherein said hydroxyl compound has a molecular weight of 120 to 1000.
Claim 5
Dependent Claim
30 words
The process according to claim 1 wherein said organic polyisocyanate mixture contains 60 to 70 percent by weight of diphenylmethane diisocyanate based on the total weight of the polyisocyanate mixture.
Claim 6
Dependent Claim
56 words
The process according to claim 2 wherein reacted in an equivalency ratio of NCO group to active hydrogen atoms of said hydroxyl compound of 5:1 to 50:1 said organic poly-isocyanate has been reacted with said hydroxyl compound in an equivalency ratio of NCO group to active hydrogen atom of said hydroxyl compound of 5:1 to 50:1.
Claim 7
Dependent Claim
30 words
The process according to claim 3 wherein said organic polyisocyanate mixture contains 60 to 70 percent by weight of diphenylmethane diisocyanate based on the total weight of the polyisocyanate mixture.
Claim 8
Dependent Claim
18 words
The process according to claim 5 wherein said hydroxyl compound has a molecular weight of 120 to 1000.
Claim 9
Dependent Claim
32 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.
References Cited (Backward Citations)
No citation records indexed.
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