Patent US4972003A successfully refreshed from Google Patents.
US4972003A
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Foaming system for rigid urethane and isocyanurate foams
Assignee: Dow Chemical Co
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Filing: 1989-05-10
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Granted: 1990-11-20
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Expires: 2009-05-10
Abstract
Abstract This invention relates to a process for preparing a rigid, closed-celled polyisocyanate-based foam in the presence of a blowing agent composition. The blowing agent composition comprises one or more organic compounds, particularly halocarbons, having a boiling point of less than or equal to 272K at atmospheric pressure, and further is substantially free of organic compounds having a boiling point of 273K or greater. Preferred halocarbons are chlorofluoroethanes and fluoroethanes.
Inventors
- 👤 Henri J. M. Grunbauer
- 👤 Guido F. Smits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; C08J9/144; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A process for preparing a rigid closed-celled polyisocyanate based foam which comprises contacting under reaction conditions an organic polyisocyanate with a hydroxyl-terminated alkylene oxide adduct in the presence of a blowing agent which consists of one or more chlorofluorobromofluoro-, or fluoro-, -ethane, or -propane compounds or mixtures thereof having a boiling point of from 235K to about 27K and in the presence of a blowing agent precursor and wherein the blowing agent is substantially free of an organic compound having a boiling point of 273K or greater.
Claim 2
Dependent Claim
87 words
A process for preparing a rigid closed-celled polyisocyanate based foam which comprises contacting under reaction conditions an organic polyisocyanate with a hydroxyl-terminated alkylene oxide adduct in the presence of a blowing agent which consists of one or more chlorofluorobromofluoro-, or fluoro-, -ethane, or -propane compounds or mixtures thereof having a boiling point of from 235K to about 27K and in the presence of a blowing agent precursor and wherein the blowing agent is substantially free of an organic compound having a boiling point of 273K or greater.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the blowing agent is a chlorofluoroethane or fluoroethane or mixtures thereof.
Claim 4
Dependent Claim
26 words
The process of claim 2 wherein the chlorofluoroethane is selected from the group consisting of chlorotetrafluoroethane (R-124 or isomer R-124a) and chlorofluoroethane (R-142b) or mixtures thereof.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the chlorofluoroethane is chlorodifluoroethane (R-142b).
Claim 6
Dependent Claim
30 words
The process of claim 2 wherein the fluoroethane is one or more selected from the group consisting of tetrafluoroethane (R-134 or isomer R-134a), trifluoroethane (R-143), difluoroethane (R-152a) and fluoroethane (R-161).
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein the fluoroethane is tetrafluoroethane (R-134 or isomer R-134a).
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the blowing agent precursor is water.
Claim 9
Dependent Claim
11 words
The process of claim 7 wherein the chlorofluoroethane is chlorodifluoroethane (R-142b).
Claim 10
Dependent Claim
14 words
The process of claim 7 wherein the fluoroethane is tetrafluoroethane (R-134 or isomer R-134a).
Claim 11
Dependent Claim
93 words
An isocyanate reactive composition which comprises (a) at least one hydroxyl-terminated alkylene oxide adduct, and (b) from about 1 to 25 percent by total weight of (a) and (b) of a blowing agent composition characterized in that the blowing agent composition consists of one or more chlorofluoro-, bromofluoro-, or fluoro-, -ethane, or -propane compounds or mixtures thereof having a boiling point of from 235K to about 272K and a blowing agent precursor, and wherein the blowing agent composition is substantially free of an organic compound having a boiling point of 273K or greater.
Claim 12
Dependent Claim
93 words
An isocyanate reactive composition which comprises (a) at least one hydroxyl-terminated alkylene oxide adduct, and (b) from about 1 to 25 percent by total weight of (a) and (b) of a blowing agent composition characterized in that the blowing agent composition consists of one or more chlorofluoro-, bromofluoro-, or fluoro-, -ethane, or -propane compounds or mixtures thereof having a boiling point of from 235K to about 272K and a blowing agent precursor, and wherein the blowing agent composition is substantially free of an organic compound having a boiling point of 273K or greater.
Claim 13
Dependent Claim
125 words
A rigid closed-celled polyisocyanate-based foam prepared by contacting an organic polyisocyanate with a hydroxyl-terminated alkylene oxide adduct compound in the presence of a blowing agent composition characterized in that the so-prepared foam contains within its cells a gaseous mixture comprising (a) from about 5 to about 75 mole percent based on total moles of (a) and (b) of one or more chlorofluoro-, bromofluoro-, or fluoro-, -ethane, -propane compounds having a boiling point of from 235K to about 272K, and (b) from about 25 to about 95 mole percent based on total moles of (a) and (b) of a gas generated from the blowing agent precursor, and wherein the gaseous mixture is substantially free of an organic compound having a boiling point of 273K or greater.
Claim 14
Dependent Claim
125 words
A rigid closed-celled polyisocyanate-based foam prepared by contacting an organic polyisocyanate with a hydroxyl-terminated alkylene oxide adduct compound in the presence of a blowing agent composition characterized in that the so-prepared foam contains within its cells a gaseous mixture comprising (a) from about 5 to about 75 mole percent based on total moles of (a) and (b) of one or more chlorofluoro-, bromofluoro-, or fluoro-, -ethane, -propane compounds having a boiling point of from 235K to about 272K, and (b) from about 25 to about 95 mole percent based on total moles of (a) and (b) of a gas generated from the blowing agent precursor, and wherein the gaseous mixture is substantially free of an organic compound having a boiling point of 273K or greater.
References Cited (Backward Citations)
US3391093A
Cited
US4636529A
Cited
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