Methods of forming polyol premixes and foamable compositions and foams formed therefrom
This invention relates to thermoset, thermal insulating panel, pour-in-place and pour-in-place foams having desirable and unexpectedly low thermal conductivity, and to compositions, method and systems which use and/or are used to make such foams comprising: (a) providing thermosetting foam forming component and a blowing agent for forming predominantly closed cells in the foam, wherein the blowing agent comprises: (i) cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzzm(Z)) and cyclopentane, with the HFO-1336mzzm(Z) and cyclopentane in the blowing agent together comprising at least about 50% by weight of the total of all components in the blowing agent and (ii) the weight ratio of HFO-1336mzzm(Z) to cyclopentane in the blowing agent is from about 45:55 to less than 68:32 and (b) forming foam from said provided foamable composition.
1. A polyol premix having improved resistance to frothing comprising:
(a) one or more polyester polyols; and
(b) a blowing agent comprising from greater than about 80% to about 97% by weight based on the total weight of blowing agent of trans 1-chloro-3,3,3-trifluoropropene (transHFCO-1233zd) and from about 3% to less than about 20% by weight based on the total weight of blowing agent of at least one of cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzzm(Z) or cis-1336mzzm), methyl formate, and combinations of these, wherein the de-frothing time of said polyol premix is at least about 30% less than the defrothing time of said polyol premix except having a blowing agent consisting of transHFCO-1233zd.
2. The polyol premix of claim 1 wherein said polyol in said polyol premix consists essentially of polyester polyol.
3. The polyol premix of claim 1 wherein said polyol in said polyol premix comprises at least about 50% by weight of polyester polyol.
4. The polyol premix of claim 1 wherein said polyol in said polyol premix comprises at least about 70% by weight of polyester polyol.
5. The polyol premix of claim 1 wherein said polyol in said polyol premix comprises at least about 80% by weight of polyester polyol.
6. The polyol premix of claim 1 wherein said polyol in said polyol premix comprises at least about 90% by weight of polyester polyol.
7. The polyol premix of claim 1 wherein the de-frothing time of said polyol premix is at least about 50% less than the defrothing time of said polyol premix except having a blowing agent consisting of transHFCO-1233zd.
8. The polyol premix of claim 1 wherein the de-frothing time of said polyol premix is at least about 80% less than the defrothing time of said polyol premix except having a blowing agent consisting of transHFCO-1233zd.
9. The polyol premix of claim 1 wherein said blowing agent further comprises cis-1,1,1,4,4,4-hexafluoro-2-butene.
10. The polyol premix of claim 1 wherein said blowing agent further comprises methyl formate.
11. The polyol premix of claim 1 wherein said blowing agent further comprises cis-1,1,1,4,4,4-hexafluoro-2-butene and methyl formate.
12. The polyol premix of claim 1 wherein said blowing agent consists essentially of transHFCO-1233zd, cis-1,1,1,4,4,4-hexafluoro-2-butene and methyl formate.
13. The polyol premix of claim 1 wherein said blowing agent consists essentially of transHFCO-1233zd and cis-1,1,1,4,4,4-hexafluoro-2-butene.
14. The polyol premix of claim 1 wherein said blowing agent consists essentially of transHFCO-1233zd and methyl formate.
15. The polyol premix of claim 1 further comprising a surfactant.
16. The polyol premix of claim 15 wherein said surfactant comprises a silicone surfactant.
17. The polyol premix of claim 16 wherein said surfactant further comprises a glycol ether.
18. The polyol premix of claim 1 wherein the de-frothing time of said polyol premix is not greater than about 40 minutes.
19. The polyol premix of claim 1 wherein the de-frothing time of said polyol premix is not greater than about 30 minutes.
20. The polyol premix of claim 1 wherein the de-frothing time of said polyol premix is not greater than about 20 minutes.