EP0355713A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyurethane foam prepared with reduced levels of hard halocarbon blowing agents
Assignee: Dow Chemical Co
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Filing: 1989-08-17
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Granted: —
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Expires: 2009-08-17
Abstract
Abstract Closed-cell polyisocyanate-based foams are prepared using a blowing agent mixture containing an organic compound having a boiling point in excess of 65 °C in conjunction with another organic compound having a boiling point below 40 C. This invention provides for the use of high-boiling blowing agents which previously were not considered suitable for preparing closed-cell foam due to the higher temperatures required to vaporize same and their tendency to condense at ambient temperatures, causing shrinkage of the foam.
Inventors
- 👤 Guido Freddy Smits
- 👤 Johan A. Thoen
- 👤 Robert Malcolm Davidson
- 👤 Llewellyn D. Booth
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 17:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
105 words
A process for preparing a blown, closed-cell, polyisocyanate-based foam comprising reacting a polyisocyanate with an active hydrogen-containing material in the presence of a blowing agent, wherein the blowing agent comprises a mixture of: (a) from 45 to 90 mole percent, based on components (a) and (b) of at least one organic compound having a boiling point from -30°C to 40°C; and (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of at least one organic compound having a boiling point of at least 65 C but less than the maximum temperature encountered in the formation of the foam.
Claim 2
Dependent Claim
105 words
A process for preparing a blown, closed-cell, polyisocyanate-based foam comprising reacting a polyisocyanate with an active hydrogen-containing material in the presence of a blowing agent, wherein the blowing agent comprises a mixture of: (a) from 45 to 90 mole percent, based on components (a) and (b) of at least one organic compound having a boiling point from -30°C to 40°C; and (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of at least one organic compound having a boiling point of at least 65 C but less than the maximum temperature encountered in the formation of the foam.
Claim 3
Dependent Claim
26 words
A process as claimed in Claim 1 wherein component (a) and component (b) each have a gas thermal conductivity of less than 15 mW/MK at 25°C.
Claim 4
Dependent Claim
26 words
A process as claimed in Claim 2 wherein component (a) and component (b) each have a gas thermal conductivity of less than 13 mW/MK at 25°C.
Claim 5
Dependent Claim
17 words
A process as claimed in Claim 3 wherein component (a) and component (b) are each a halocarbon.
Claim 6
Dependent Claim
13 words
A process as claimed in Claim 4 wherein component (a) is a chlorofluorocarbon.
Claim 7
Dependent Claim
16 words
A process as claimed in Claim 5 wherein component (b) is a chlorine-substituted methane or ethane.
Claim 8
Dependent Claim
14 words
A process as claimed in Claim 6 wherein component (a) is a soft CFC.
Claim 9
Dependent Claim
13 words
A process as claimed in Claim 7 wherein component (b) is 1,1,1-trichloroethane, 1,1,2-trichloroethane.
Claim 10
Dependent Claim
97 words
A blown, closed-cell, polyisocyanate-based foam prepared by reacting a polyisocyanate with an active hydrogen containing material in the presence of a blowing agent, wherein the blowing agent comprises a mixture of: (a) from 45 to 90 mole percent, based on components (a) and (b) of an organic compound having a boiling point from -30°C to 40°C. (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of an organic compound having a boiling point of at least 65°C but less than the maximum temperature encountered in the formation of the foam.
Claim 11
Dependent Claim
97 words
A blown, closed-cell, polyisocyanate-based foam prepared by reacting a polyisocyanate with an active hydrogen containing material in the presence of a blowing agent, wherein the blowing agent comprises a mixture of: (a) from 45 to 90 mole percent, based on components (a) and (b) of an organic compound having a boiling point from -30°C to 40°C. (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of an organic compound having a boiling point of at least 65°C but less than the maximum temperature encountered in the formation of the foam.
Claim 12
Dependent Claim
81 words
A blown, closed-cell polyisocyanate-based foam containing in its cells a gaseous mixture comprising: (a) from 45 to 90 mole percent, based on components (a) and (b) of an organic compound having a boiling point from -30 C to 40°C. (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of an organic compound having a boiling point of at least 65 C but less than the maximum temperature encountered in the formation of the foam.
Claim 13
Dependent Claim
81 words
A blown, closed-cell polyisocyanate-based foam containing in its cells a gaseous mixture comprising: (a) from 45 to 90 mole percent, based on components (a) and (b) of an organic compound having a boiling point from -30 C to 40°C. (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of an organic compound having a boiling point of at least 65 C but less than the maximum temperature encountered in the formation of the foam.
Claim 14
Dependent Claim
86 words
A composition comprising a blend of an active hydrogen-containing material and a minor amount of a mixture comprising (a) from 45 to 90 mole percent, based on components (a) and (b) of an organic compound having a boiling point from -30 C to 40°C. (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of an organic compound having a boiling point of at least 65 C but less than the maximum temperature encountered in the formation of the foam.
Claim 15
Dependent Claim
86 words
A composition comprising a blend of an active hydrogen-containing material and a minor amount of a mixture comprising (a) from 45 to 90 mole percent, based on components (a) and (b) of an organic compound having a boiling point from -30 C to 40°C. (b) from 10 to 55 mole percent, based on the weight of components (a) and (b) of an organic compound having a boiling point of at least 65 C but less than the maximum temperature encountered in the formation of the foam.
References Cited (Backward Citations)
No citation records indexed.
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