EP0224945A1
Expired / Lapsed
EP
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Process for the preparation of a heat-stable polyurethane foam
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1986-10-14
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Granted: —
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Expires: 2006-10-14
Abstract
Abstract Process for the preparation of heat-stable, non-silicate polyurethane foams by reacting a polyol with an organic compound having more than one isocyanate group in the presence of polytetrafluoroethylene particles and a blowing agent. The resulting foams may be used for insulating industrial steam pipes or pipes for district heating systems.
Inventors
- 👤 Kim Harnov Klausen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 22:42
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2375/00; C08J2375/04; C08J2427/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A process for the preparation of a heat-stable polyurethane foam by reacting at least one polyol with an organic compound having more than one isocyanate group per molecule, characterised in that said reaction is carried out in the presence of polytetrafluoroethylene particles and a blowing agent.
Claim 2
Dependent Claim
46 words
A process for the preparation of a heat-stable polyurethane foam by reacting at least one polyol with an organic compound having more than one isocyanate group per molecule, characterised in that said reaction is carried out in the presence of polytetrafluoroethylene particles and a blowing agent.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein polytetrafluoroethylene is present as dispersible particles.
Claim 4
Dependent Claim
31 words
A process according to claim 1 or 2, wherein the polytetrafluoroethylene is employed in the range of from 25 to 60 parts by weight per 100 parts by weight of polyol.
Claim 5
Dependent Claim
33 words
A process according to any one of the preceding claims, wherein the polytetrafluoroethylene is employed in the range of from 35 to 50 parts by weight per 100 parts by weight of polyol.
Claim 6
Dependent Claim
28 words
A process according to any one of the preceding claims, wherein the organic compound having more than one isocyanate group is a toluene diisocyanate or a 4,4′-diphenylmethane diisocyanate.
Claim 7
Dependent Claim
23 words
A process according to any one of the preceding claims, wherein the organic compound having more than one isocyanate group is 4,4′-diphenylmethane diisocyanate.
Claim 8
Dependent Claim
19 words
A process for the preparation of a heat-stable polyurethane foam, substantially as hereinbefore described with reference to the Example.
Claim 9
Dependent Claim
19 words
A process for the preparation of a heat-stable polyurethane foam, substantially as hereinbefore described with reference to the Example.
Claim 10
Dependent Claim
18 words
A heat-stable polyurethane foam whenever prepared by a process as claimed in any one of the preceding claims.
References Cited (Backward Citations)
GB1025914A
Cited
US3753933A
Cited
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