EP0091828A1
Expired / Lapsed
EP
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Process for producing rigid polyurethane foams
Assignee: Hitachi Ltd
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Filing: 1983-04-13
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Granted: —
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Expires: 2003-04-13
Abstract
Abstract A rigid polyurethane foam can be obtained in one-shot method by reacting a polyol mixture comprising a tetrafunctional tolylenediamine type polyol, a difunctional propylene type polyol, an octafunctional sucrose type polyol and a trifunctional diethanolamine type polyol with an isocyanate component in the presence of a reaction catalyst, a blowing agent and a foam stabilizer. The thus obtained rigid polyurethane foams have improved fluidity, dimensional stability, friability and thermal conductivity and shortened demolding time.
Inventors
- 👤 Reishi Naka
- 👤 Katsuo Shibata
- 👤 Isao Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/4804; C08G18/4812; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A process for producing a rigid polyurethane foam in one-shot method by reacting a polyol component with an isocyanate component in the presence of a reaction catalyst, a blowing agent and a silicone surfactant, characterized by using, as said polyol component, a polyol mixture comprising a tetrafunctional tolylenediamine type polyol, a difunctional propylene type polyol, an octafunctional sucrose type polyol and a trifunctional diethanolamine type polyol.
Claim 2
Dependent Claim
66 words
A process for producing a rigid polyurethane foam in one-shot method by reacting a polyol component with an isocyanate component in the presence of a reaction catalyst, a blowing agent and a silicone surfactant, characterized by using, as said polyol component, a polyol mixture comprising a tetrafunctional tolylenediamine type polyol, a difunctional propylene type polyol, an octafunctional sucrose type polyol and a trifunctional diethanolamine type polyol.
Claim 3
Dependent Claim
25 words
A process for producing a rigid polyurethane foam according to Claim 1, wherein the polyol mixture has an average OH value of 450 to 480.
Claim 4
Dependent Claim
60 words
A process for producing a rigid polyurethane foam according to Claim 1, wherein the tolylenediamine type polyol is 64 to 66% by weight of the polyol mixture, the propylene type polyol is 14 to 16% by weight, the sucrose type polyol is 1 3 to 1 5% by weight and the diethanolamine type polyol is 5 to 7% by weight..
References Cited (Backward Citations)
FR1480022A
Cited
US3890255A
Cited
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