US4997858A
Expired / Lapsed
US
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Method for preparing a flexible polyurethane foam
Assignee: Recticel NV SA
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Filing: 1989-04-14
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Granted: 1991-03-05
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Expires: 2009-04-14
Abstract
Abstract A method for preparing a flexible polyurethane foam, wherein a polyether-polyol having an average molecular weight from 1000 to 8000 and an average functionality not larger than 4, is brought into reaction with an organic polyisocyanate in the presence of a foam stabilizer, a catalyst and blowing agent comprising methylformate, wherein a cross-linker/extender and/or amine catalyst with delayed action is added to said reaction mixture.
Inventors
- 👤 Lucien Jourquin
- 👤 Eddie Du Prez
- 👤 Patrick Demeyer
- 👤 Rudi Mortelmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/12; C08J9/14; C08J9/149; C08J9/142; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
87 words
A method for preparing a flexible polyurethane foam wherein a polyether-polyol having an average molecular weight of from 1000 to 8000 and an average functionality not larger than 4 is reacted with an organic polyisocyanate in the presence of a foam stabilizer, a catalyst and a blowing agent comprising at least 50% methyl formate, wherein a cross-linker/extender in an amount of from 0.1 to 3 parts per 100 parts polyol and/or an amine catalyst with a delayed action is added to said reaction mixture comprising said components.
Claim 2
Independent Claim
87 words
A method for preparing a flexible polyurethane foam wherein a polyether-polyol having an average molecular weight of from 1000 to 8000 and an average functionality not larger than 4 is reacted with an organic polyisocyanate in the presence of a foam stabilizer, a catalyst and a blowing agent comprising at least 50% methyl formate, wherein a cross-linker/extender in an amount of from 0.1 to 3 parts per 100 parts polyol and/or an amine catalyst with a delayed action is added to said reaction mixture comprising said components.
Claim 3
Dependent Claim
36 words
A method as claimed in claim 1, wherein a cross-linker/extender is used which comprises a compound having a molecular weight not larger than 400 and a functionality of at least 2 and 8 at the highest.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 2, wherein a cross-linker/extender is used which comprises glycerol, trimethylolpropane, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethanolamine and/or alkylene oxide poly-addition products thereof.
Claim 5
Dependent Claim
39 words
A method as claimed in claim 2, wherein a cross-linker/extender is used which comprises a compound having a functionality of at least 2 concerning at least one functional NH or NH 2 group and at least one functional OH-group.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 4, wherein a cross-linker/extender is used which comprises monoethanolamine, diethanolamine, di-isopropanolamine and/or alkylene/oxide poly- addition products thereof.
Claim 7
Dependent Claim
42 words
A method as claimed in claim 2, wherein a cross-linker/extender is used which comprises a compound having a functionality of at least 2 concerning at least two functional NH or NH 2 -groups, such as polyamines and/or alkyle oxide poly-addition products thereof.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1, wherein said cross-linker/extender is used in quantities varying from 0.3 to 0.7 part by 100 parts polyol.
Claim 9
Dependent Claim
48 words
A method as claimed in claim 1, wherein an amine catalyst is used, which comprises an amine being at least partially neutralized with carboxylic acid, wherein said carboxylic acid reacts with isocyanate or with primary amine groups present in said reaction mixture thus liberating the amine as catalyst.
Claim 10
Dependent Claim
23 words
A method as claimed in claim 1, wherein a heat sensible amine catalyst is used, the catalyst activity thereof increasing with increasing temperature.
Claim 11
Dependent Claim
27 words
A method as claimed in claim 1, wherein said amine catalyst is used in quantities varying from 0.05 to 1 part by weight for 100 parts polyol.
Claim 12
Dependent Claim
28 words
A method as claimed in claim 1, wherein an excess of isocyanate is used having an isocyanate index higher than 100 and preferably comprised between 105 and 115.
Claim 13
Dependent Claim
52 words
A method as claimed in claim 1, wherein 1 to 30 parts by weight for 100 parts by weight polyol are added as physical blowing agent which, beside methyl formate, comprises a partially or completely halogenated hydrocarbon, wherein the methylformate concentration in the physical blowing agent is at least 50% by weight.
Claim 14
Dependent Claim
20 words
A method as claimed in claim 12, wherein at least 95% methyl formate is used in said physical blowing agent.
Claim 15
Dependent Claim
32 words
A method as claimed in claim 13, wherein as physical blowing agent use is made of 1 to 30 parts by weight of pure methyl formate for 100 parts by weight polyol.
Claim 16
Dependent Claim
38 words
A method as claimed in claim 1, wherein a chemical blowing agent is used which comprises 0.5 to 5.5 parts by weight water and/or 0.1 to 5 parts by weight formic acid for 100 parts by weight polyol.
Claim 17
Dependent Claim
102 words
A method as claimed in claim 1, wherein a catalyst system is applied which comprises at least 0.05 to 0.5 part by weight for 100 parts by weight polyol of an organic metal catalyst, such as a tin catalyst in combination with, on the one hand, 0.01 to 0.9 part by weight for 100 parts by weight polyol of an amine catalyst and 0.1 to 3 parts by weight for 100 parts by weight polyol of said cross-linker/extender or, on the other hand, 0.05 to 1 part by weight of said amine catalyst with delayed action for 100 parts by weight polyol.
Claim 18
Dependent Claim
30 words
A method as claimed in claim 1, wherein use is made, as foam stabilizer, of 0.2 to 3% by weight for 100 parts by weight polyol of a silicon surfactant.
References Cited (Backward Citations)
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