THERMOSETTING FOAMS HAVING IMPROVED INSULATING VALUE
Disclosed are methods of forming foam comprising: (a) providing a foamable composition comprising an isocyanate, a polyol and a physical blowing agent comprising at least about 50% by weight of hydrohaloolefin, including trans1233zd, and wherein the polyol comprises a polyol or mixture of polyols such that the hydrohaloolefin, including trans1233zd, has a solubility in said polyol of less than about 30%; and (b) forming a foam from said foamable composition.
1 . A method of producing thermosetting, thermal insulating foam comprising:
(a) providing a foamable composition comprising an isocyanate, a polyol and a physical blowing agent, wherein said polyol comprises at least about 50% by weight of low solubility polyol relative to said physical blowing agent, and wherein said physical blowing agent comprising at least about 50% by weight of trans-1-chloro-3,3,3-trifluoropropene (trans1233zd); and
(b) forming a foam from said foamable composition.
2 . The method of claim 1 wherein the foam has an initial lambda less than or equal to 20 mW/mK.
3 . The method of claim 1 wherein the foam has an aged lambda less than or equal to 27 mW/mK.
4 . The method of claim 1 wherein the foam has a delta lambda less than about 7 mW/mK.
5 . The method of claim 4 wherein said polyol comprises at least about 75% by weight of low solubility polyol.
6 . The method of claim 4 wherein said polyol comprises at least about 75% by weight of polyester polyol.
7 . The method of claim 6 wherein said physical blowing agent comprising at least about 75% by weight of said trans1233zd.
8 . The method of claim 4 wherein said polyol comprises at least about 90% by weight of low solubility polyol.
9 . The method of claim 8 wherein said physical blowing agent comprising at least about 75% by weight of said trans1233zd.
10 . The method of claim 1 wherein said low solubility polyol comprises a polyol or mixture of polyols in which said trans1233zd has a solubility is said polyol of less than about 25% and wherein said foam has a delta lambda less than about 6 mW/mK.
11 . A method of producing thermoset thermal insulating foam comprising:
(a) providing a foamable composition comprising an isocyanate, a polyol and a physical blowing agent, wherein said physical blowing agent comprises at least about 50% by weight of trans-1-chloro-3,3,3-trifluoropropene (trans1233zd), and wherein said polyol comprises a polyol or mixture of polyols such that said trans1233zd has a solubility is said polyol of less than about 25%; and
(b) forming a foam from said foamable composition.
12 . The method of claim 11 wherein said polyol comprises a polyol or mixture of polyols such that said trans1233zd has a solubility is said polyol of about 20% or less.
13 . The method of claim 12 wherein said polyol comprises a polyol or mixture of polyols such that said trans1233zd has a solubility is said polyol of about 17% or less.
14 . The method of any of claim 13 wherein the foam has an initial lambda less than or equal to 20 mW/mK.
15 . The method of claim 13 wherein the foam has an aged lambda less than or equal to 27 mW/mK.
16 . The method of claim 13 wherein the foam has a delta lambda less than about 7 mW/mK.
17 . The method of claim 14 wherein the foam has a delta lambda less than about 7 mW/mK.
18 . The method of claim 13 wherein the foam has a delta lambda less than about 6 mW/mK.
19 . The method of claim 14 wherein the foam has a delta lambda less than about 6 mW/mK.
20 . The method of claim 19 wherein said physical blowing agent comprises at least about 75% by weight of trans1233zd.