EP0398147A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A foaming system for rigid urethane and isoyanurate foams
Assignee: Dow Chemical Co
•
Filing: 1990-05-09
•
Granted: —
•
Expires: 2010-05-09
Abstract
Abstract This invention relates to rigid closed-celled polyisocyanate-based foams exhibiting improved dimensional stability and a process for their preparation. In particular, it relates to resulting foams containing within their cells, a gas mixture comprising from 15 to 70 mole percent carbon dioxide and from 30 to 85 mole percent of a halocarbon mixture. The halocarbon mixture itself, comprises (a) from 40 to 95 mole percent based on moles of (a) and (b) present of a halocarbon compound having a boiling point of at least 283°K, and (b) from 50 to 60 mole percent of a halocarbon compound having a boiling point equal to or less than 266°K. Preferred halocarbons for component (a) and (b) are ethane halocarbons especially fluorodichloroethane or dichlorotrifluoroethane and chlorodifluoroethane, respectively.
Inventors
- 👤 Guido Freddy Smits
- 👤 Henri Jacobus Marie Grünbauer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
C; C08; C08G; C08G18/00; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A process for preparing a rigid closed-celled polyisocyanate-based foam which comprises reacting an organic polyisocyanate with an active hydrogen-containing compound in the presence of a blowing agent, characterized in that the blowing agent comprises: (a) from 40 to 95 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boiling point of at least 283°K, and (b) from 5 to 60 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boiling point less than or equal to about 266°K, and wherein the ratio of the said boiling point of a component (a) to a component (b), is from about 1.06:1 to about 1.20:1, and wherein the said blowing agent is substantially free of any organic compound having a boiling point of 338°K or greater.
Claim 2
Dependent Claim
137 words
A process for preparing a rigid closed-celled polyisocyanate-based foam which comprises reacting an organic polyisocyanate with an active hydrogen-containing compound in the presence of a blowing agent, characterized in that the blowing agent comprises: (a) from 40 to 95 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boiling point of at least 283°K, and (b) from 5 to 60 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boiling point less than or equal to about 266°K, and wherein the ratio of the said boiling point of a component (a) to a component (b), is from about 1.06:1 to about 1.20:1, and wherein the said blowing agent is substantially free of any organic compound having a boiling point of 338°K or greater.
Claim 3
Dependent Claim
61 words
A process as claimed in Claim 1 wherein, based on components (a) and (b), component (a) is present in an amount of from (1) 40 to 80 mole percent or (2) from 40 to 65 mole percent; and component (b) is present in an amount of from (1) 20 to 60 mole percent or (2) from 35 to 60 mole percent.
Claim 4
Dependent Claim
51 words
A process as claimed in any one of the preceding claims wherein the halocarbon compound of component (a) comprises one or more methane-, or ethanehalocarbons or mixtures thereof; and wherein the halocarbon compound of component (b) comprises one or more methane-, ethane-, propane-, ethylene-, propylene-, or cyclic-halocarbon compound or mixtures thereof.
Claim 5
Dependent Claim
21 words
A process as claimed in any one of the preceding claims wherein both components (a) and (b) comprise an ethane halocarbon.
Claim 6
Dependent Claim
44 words
A process as claimed in Claim 3 wherein the halocarbon component (a) is trichlorofluoromethane (R-11), dichlorotrifluoroethane (R-123), trifluorochloroethane (R-133), fluorodichloroethane (R-141b) or mixtures thereof; and the halocarbon component (b) is chlorofluoromethane (R-31), bromodifluoromethane (R-22b1), chlorotetrafluoroethane (R-134 or isomer 134a), chlorodifluoro-ethane (R-142b) or mixtures thereof.
Claim 7
Dependent Claim
29 words
A process as claimed in Claim 4 wherein component (a) is fluorodichloroethane (R-141b), dichlorotrifluoroethane (R-123) or mixtures thereof; and component (b) is chlorodifluoroethane (R-142b), tetrafluoroethane (R-134a) or mixtures thereof.
Claim 8
Dependent Claim
26 words
A process as claimed in any one of the preceding claims additionally comprising a blowing agent precursor which provides for the generation of carbon dioxide gas.
Claim 9
Dependent Claim
14 words
A process as claimed in Claim 7 wherein the blowing agent precursor is water.
Claim 10
Dependent Claim
155 words
A rigid, closed-cell polyisocyanate-based foam prepared according to the process as claimed in Claim 7 characterized in that the resulting foam contains within its cells a gaseous composition comprising (a) from 30 to 85 mole percent, based on components (a) and (b), of a mixture itself comprising (1) from 40 to 95 mole percent, based on components (1) and (2), of a halocarbon compound having a boiling point of at least 283°K, and (2) from 5 to 60 mole percent, based on components (1) and (2), of a halocarbon compound having a boiling point of less than or equal to 266°K, and wherein the ratio of such boiling points of component (1) to component (2) is from 1.06 to 1.20:1 and wherein said mixture is substantially free of any compound having a boiling point of 338°K or greater; and (b) from 15 to 70 mole percent, based on components (a) and (b), of carbon dioxide.
Claim 11
Dependent Claim
158 words
An isocyanate-reactive composition comprising at least one active hydrogen-containing compound having an equivalent weight of from 50 to 700 and a blowing agent characterized in that the blowing agent is present in an amount of from 1 to 30 weight percent based on the total weight of active hydrogen-containing compound(s) and blowing agent present and in that the blowing agent comprises: (a) from 40 to 95 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boilig point of at least 283°K, and (b) from 5 to 60 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boiling point less than or equal to 266°K, and wherein the ratio of the said boiling point of component (a) to component (b), is from 1.06:1 to 1.20:1, and wherein said blowing agent is substantially free of any oranic compound having a boiling point of 338°K or greater.
Claim 12
Dependent Claim
158 words
An isocyanate-reactive composition comprising at least one active hydrogen-containing compound having an equivalent weight of from 50 to 700 and a blowing agent characterized in that the blowing agent is present in an amount of from 1 to 30 weight percent based on the total weight of active hydrogen-containing compound(s) and blowing agent present and in that the blowing agent comprises: (a) from 40 to 95 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boilig point of at least 283°K, and (b) from 5 to 60 mole percent, based on components (a) and (b), of at least one halocarbon compound having a boiling point less than or equal to 266°K, and wherein the ratio of the said boiling point of component (a) to component (b), is from 1.06:1 to 1.20:1, and wherein said blowing agent is substantially free of any oranic compound having a boiling point of 338°K or greater.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.